Home

Model 9300 - Lake Shore Cryotronics, Inc.

Contents

1. 1 2 1 2 6 General Superconducting Magnet VSM 1 2 2 PRE INSTALLATION 35 etn ea Ein EID 2 1 2 GENERAL monto akapanata ie teeta 2 1 2 1 1 Inspecting and Unpacking the Model 9300 2 1 2 1 2 Removing Packing Material from the Magnetometer Drive a 2 4 2 1 3 Site Requirements ace ec et eta rae ode diei epe eset deua dtc ee 2 2 2 1 4 System Power And Ground 2 3 2 1 5 Environmental 2 4 2 2 Uu M 2 4 2 2 1 Handling Liquid Helium Liquid nnne 2 5 2 2 1 1 Recommended First Aid for LHe or LN 2 5 2 2 2 Electrostatic Discharge etuer LL das EORR NR ERN Ee e 2 6 2 2 2 1 Identification of Electrostatic Discharge Sensitive Components 2 6 2 2 2 2 Handling Electrostatic Discharge Sensitive Components 2 6 2 2 3 Instrument Safely uuu un une dei cis ee ec u de 2 6 2 2 4
2. 1 2 Transverse VSM Signal Cable Pinouts X C 1 C 3 241 Cable Pinouts dr Pa ee aaa kana Ea C 1 C 4 Solenoid Valve Cable Pinout ua sayata y wai aq usya caq C 1 C 5 Flow Cryostat Needle Valve Stepper Motor Cable C 1 C 6 MPS External Programming Adaptor Pinouts u C 2 C 7 Model 735 Drive Cable 5 u u u u 2 8 Model 735 Feedback Cable Pinouts 1 2 D 1 Control Character Alternate Code D 1 iv Table of Contents Lake Shore Model 9300 Cryogenic VSM User s Manual CHAPTER 1 INTRODUCTION 11 GENERAL Lake Shore Cryotronics Inc manufactures the Model 9300 Cryogenic Vibrating Sample Magnetometer VSM to be one of the most versatile computer controlled systems to characterize magnetic properties of matter State of the art design augmented with a comprehensive applications software package allows greater adaptability to specific application requirements Broad measurement capability high sensitivity fast measurement speed and easy operation make the system equally attractive for either research and development or manufacturing 1 2 MODEL 9300 SPECIFICATIONS 1 2 1 Measurements The Model
3. Model 620 622 Remote Program Input in VOLTAGE gt Model 620 622 sets CURRENT in superconducting magnet 4 3 2 Field Reading IDEASVSM IDEAS735 Model 735 Controller Program Field Output Input Program Monitor Input Output 620 622 Magnet Power Supply Superconducting Magnet e Figure 4 1 Block Diagram of VSM Field Measurement Control Loop To READ the applied field the Model 735 implements a ADC and reads the current through a shunt in the Model 620 622 via the Monitor Output The signal flow for READING magnetic field is Current in superconducting magnet and shunt CURRENT gt Model 620 622 Monitor Output VOLTAGE gt Model 735 Field Input ADC VOLTAGE gt Software converts Model 735 DAC readings to FIELD 4 2 Calibration Lake Shore Model 9300 Cryogenic VSM User s Manual The IDEASVSM software implements field control configuration using the calibrated values of the constants listed above In addition there are instrumentation offsets which are calibrated out of the system The non linear term remenant field of the superconducting magnet is not accounted for in the configuration The ramp rate of a superconducting magnet is limited by the maximum charging voltage a design parameter tested during magnet manufacturing The maximum ramp rate charging voltage relationship is shown in the equation b
4. Knnn OM _ _ nnnn _Vnnnn Wnnnn Model 704 Remote Motion Control 6 3 Lake Shore Model 9300 Cryogenic VSM User s Manual 6 3 2 Normal Initial Setup To restore the Model 704 to its correct initial state before running the IDEAS 4 Axis software power up the controller start the Model 704 Hyperterminal session then type the following commands terminate lines with carriage returns italics indicates response lt spacebar gt 16 V100 1400 K8 00 12 8 1 400 V 100 0 2 0 10 Motor moves 10 steps in positive direction Z 10 10 Motor moves 10 steps in negative direction Z 0 6 3 3 Sample of Typical Operation EO turn motor phases off switch to channel E12 turn motor phases on 00 set current location to 0 V1000 set velocity to 1000 for channel A K8 set ramp to 8 1000 move 1000 steps in the positive direction A129 check limits 3 indicates Channel A selection and both limit inputs are high or inactive 0 2 1 3 2 request current position 1000 response EO turn motor phases off A16 change to channel B E12 turn motor phases on O0 set current location to 0 V400 set velocity to 400 K4 set ramp to 4 a faster acceleration than K 8 550 move 550 steps in the negative direction A129 check limits 18 indicates channel selection and low limit activation 16 2 0 18 Z request current position 327 response current
5. Query Field Controlled Ramp Value Set Field Output Query Field Output Query Ramp Status Set Ramp Rate Query Ramp Rate Set Current Ramp Value Query Current Ramp Value Common Commands IDN Query Identification Interface Commands ADDR Set Address ADDR Address Query END END EOI Query TERM Terminator TERM Terminator Query Reading Setup and Reading Commands ALLR Query all available reading data EMUR Set Range EMUR Query Range EMUTC Set Filter Time Constant EMUTC Query Filter Time Constant HEAD Set Head Drive Status HEAD Query Head Drive Status NEWR Query Data from Newest to Oldest OLDR Query Data from Oldest to Newest QUAD Set Channel Y Quadrature Status QUAD Query Channel Y Quadrature Status READ Query Newest Reading Data READC Clear Data from Buffer READP Set Sample Period for Read Buffer READP Query Read Buffer Sample Period READS Query Reading Status for Inputs Reading Setup and Reading Commands CMODE Set Field Setting Mode CMODE Query Field Setting Mode CONLIM Set Field Controlled Output Change Limit 5 9 CONLIM Query Output Change Limit CONPI Set Field Controlled P amp Parameters CONPI Query Field Controlled P amp Parameters 5 9 CONRT Set Field Controlled Ramp Rate CONRT Query Field Controlled Ramp Rate 5 10 CONSP Query Field Controlled Ramp Setpoint 5 10 CONST Query Field Controlled Ramp Status 5 10 CONTO Set Field Controlled Ramp Value APCAL Initiate Auto Phase Ca
6. USER S MANUAL Model 9300 Cryogenic Vibrating Sample Magnetometer VSM Hardware Volume 1 Also Refer To Volume 2 VSM System Software Manual akeShore Lake Shore Cryotronics Inc 575 McCorkle Blvd Westerville Ohio 43082 8888 USA E Mail Addresses sales lakeshore com service lakeshore com Visit Our Website www lakeshore com Fax 614 891 1392 Telephone 614 891 2243 Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake Shore Cryotronics Inc No government or other contractual support or relationship whatsoever has existed which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics Inc in these developments Methods and apparatus disclosed herein may be subject to U S Patents existing or applied for Lake Shore Cryotronics Inc reserves the right to add improve modify or withdraw functions design modifications or products at any time without notice Lake Shore shall not be liable for errors contained herein or for incidental or consequential damages in connection with furnishing performance or use of this material Rev 1 2 P N 119 630 12 April 1999 Lake Shore Model 9300 Cryogenic VSM User s Manual LIMITED WARRANTY Lake Shore Cryotronics Inc henceforth Lake Shore the manufacturer warrants this product to be free from defects in material or workmanship for a period of twelve 12 months six months for sensors f
7. 50 60 Hz line input if the final destination of the instruments is known when it ships Verify this configuration it is not unusual for instruments to change hands before reaching the user All line voltages discussed are single phase See Power Requirement label outside Instrument Console for system power requirements Pre Installation 2 7 Lake Shore Model 9300 Cryogenic VSM User s Manual 2 3 1 Line Voltage and Fuse Verification To verify the proper line voltage selection look at the indicator in the window of the line input assembly The voltage table on the rear of the instrument lists the line voltage range for each indicator If the range does not match your line voltage change the line voltage selector see Paragraph 2 3 2 and remove the fuse to verify its value see Paragraph 2 3 3 for fuse replacement instructions Use slow blow fuses of the value specified on the instrument rear panel WARNING To avoid potentially lethal shocks turn off instruments and disconnect from AC power before performing these procedures Only qualified personnel should perform these procedures CAUTION For continued protection against fire hazard replace only with the same fuse type and rating specified for the line voltage selected 2 3 2 Line Voltage Selection Below is the procedure to change the instrument line voltage selector Verify the fuse value whenever line voltage is changed See Figure 2 5 Locate the line
8. INS MIDS INS 1 ENDTEST 1 Strip off terminators PRINT RESPONSE INS Print return string ELSE PRINT NO RESPONSE string present if timeout END IF GOTO LOOP2 Get next command Lake Shore Model 9300 Cryogenic VSM User s Manual Model 735 Controller Remote Operation Lake Shore Model 9300 Cryogenic VSM User s Manual 5 2 IEEE 488 COMMAND SUMMARY There are several types of commands Common Paragraph 5 2 2 Interface Paragraph 5 2 3 Reading Setup and Reading Paragraph 5 2 4 Field Setting Paragraph 5 2 5 Auxiliary Paragraph 5 2 6 Miscellaneous Paragraph 5 2 7 and Calibration Paragraph 5 2 8 Command Function Command CONTO COUT COUT RAMP RMPRT RMPRT RMPTO RMPTO Auxiliary Commands AUXAD Query Auxiliary Readings AUXDA Set Auxiliary Output AUXDA Query Auxiliary Output AUXDI Query Auxiliary Input State AUXDO Set All Five Auxiliary Outputs AUXDO Query All Five Auxiliary Outputs RELAY Set Auxiliary Relay State RELAY Query Auxiliary Relay State Miscellaneous Commands BEEP Set Beeper Status BEEP Query Beeper Status IDSW Query Main Board ID Switches POKE Set Value of EEPROM Location POKE Query Value of EEPROM Location PON Query Instrument Power Status XMEM Set Value of External Memory Location 5 14 XMEM Set Value of External Memory Location 5 14 Calibration Commands ADFILT Set Filter Pole of A D Converters ADFILT Query Filter Pole of A D Converters Function
9. Installation 3 7 Lake Shore Model 9300 Cryogenic VSM User s Manual 3 2 HELIUM TRANSFER WARNING Liquid helium and liquid nitrogen are potential asphyxiants and can cause rapid suffocation without warning Store and use in an adequately ventilated area DO NOT vent the container in confined spaces DO NOT enter confined spaces where gas may be present unless area is well ventilated If inhaled remove to fresh air If not breathing give artificial respiration If breathing is difficult give oxygen Get medical attention Liquid helium and liquid nitrogen can cause severe frostbite to exposed body parts DO NOT touch frosted pipes or valves For frostbite consult a physician immediately If a physician is unavailable warm the affected parts with water that is near body temperature See Paragraph 2 2 1 for further safety information before proceeding The economical transfer of liquid helium depends upon technique Too rapid a transfer results in excessive blow off or waste of liquid It is much more economical to the dewar first with liquid nitrogen then cold helium vapor than to simply vaporize liquid helium For an efficient transfer follow one of the two transfer procedures Warm Transfer Paragraph 3 2 2 or Cold Transfer Paragraph 3 2 3 after connecting the Model 241 Liquid Helium Level Meter to the system Paragraph 3 2 1 Transfer Line System Dewar Figure 3 17 Typical
10. TIME CONSTANT SWEEP TIME 0 03 EMU 3000 Oersteds 0 1 SECONDS 6 MINUTES 0 03 0 0256 EMU 0 0211 EMU 391 5 Oersteds SQUARENESS RATIO FD AREA IN 1ST QUAD AREA IN 2ND QUAD TOTAL AREA 24 673 35 35 0 0242 132 9 Oersteds 11 13 6 Figure A 2 Thin Film Saturation Behavior 1 8 1018 Fe atoms 1 25 atom 0 927 10 20 2 1 10 2 emu Thus the sample will have a saturation moment of 0 021 well within the sensitivity of the VSM Two other quantities often seen in the literature are Mo and oo These are the values of Mg and og at 0 K They may be manipulated using the same relationships that are used for and Permeability is the ratio of the induction B to the field H u The coercivity is the field strength required to reduce the magnetization or induction to zero once the sample is saturated In Figure 1 2 the coercivity as shown on the moment vs field m vs H plot is 390 Oersted The Curie or Ne el point is the temperature at which a material ceases to be ferromagnetic or anti ferromagnetic and becomes paramagnetic Appendix A EMU to CGS Translation MAGNETIC MOMENT EMU 12 RESIDUAL FIELD APPOX 40 GAUSS USE SCALE AT RIGHT MOMENT 5 To SATURATED MOMENT 5 KILOGAUSS USE SCALE AT LEFT CURIE USING 0 956 g SAMPLE TEMPERATURE OF NICKEL IN 450
11. cm3 gram Volume susceptibility 17 Units dimensionless EXAMPLE 4 The aluminum substrate in example 2 was 2 mm thick and the sample weighed 0 21 g If the saturation moment of the sample 2 56 10 2 emu was measured at 10 kOe what was the contribution of the Aluminum 0 03 EMU T The listed specific susceptibility of Al at 20 C is 9 0 65 10 6 cm3 g Aluminum is paramagnetic see Figure 1 4 The moment then is 0 65 10 6 cm3 g 2 1 10 1 g 104 Oe 1 4 10 3 or about 5 of the sample moment including the film Table A 1 Ferromagnetic Terms and Relations 003 __ 1 emu 1 Gauss 1 erg Gauss MAGNETIZATION 0 00137 EMU SQUARENESS RATIO 0 002277 RETENTIVITY 3 120e 6 EMU FD 1 154E4 Oersteds Magnetization M Gauss moment m emu volume V cm TME CONSTANT 3SECONDS AREANZNDQUAD g SWEEP TIME 60 MINUTES TOTAL AREA 0 07756 Magnetic moment gram o moment emu mass g 1 i Induction B Gauss Field 4 M Figure A 4 Moment vs Field Plot of Aluminum Saturation Induction B H Bs Gauss Ho Saturation Magnetization M 4 Gauss Mg saturation magnetization at 0 saturation magnetic moment per gram at 0 1 Bohr magneton 0 9274 107 emu Notes 1 VSM measures m sample total magnetic moment 2 VSM output is in emu A 4 Appendix A EMU to C
12. then install the Sample Inlet Valve Stepper Motor Viewing the magnet dewar from the front the Stepper Motor Mounting Bracket installs behind and to the right of the Needle Valve The teeth of the Stepper Motor Gear engage the front of the Needle Valve Gear Figure 3 12 On the Cryostat Flange there is a mounting hole to the front right of the Needle Valve After engaging gear teeth align this hole with the hole in the Stepper Motor Mounting Bracket and secure with a 8 machine bolt Plug the Stepper Motor Cable into the Motor B output of the Model 704 Installation Red Cable Black Cable to Positive to Negative Cryostat Cryostat Terminal Terminal to EXT Figure 3 11 Connecting MPS to Superconducting Magnet Terminals SIDE VIEW Stepper Motor Model 704 Output B Needle Valve Gear Mountin Bracket Bolt Stepper Motor Mounting Bracket Cryostat Flange Figure 3 12 Installing the Sample Inlet Valve Stepper Motor 3 5 22 23 3 6 Connect a BNC cable from the Model 735 Program Out port to the Model 620 MPS Program Input port Connect a BNC cable from the Model 735 Field Input port to the Model 620 MPS Monitor Output Figure 3 13 Plug Cable 653 142 into the Model 735 Pick Up Coil X port and Cable 653 143 optional into the Model 735 Pick Up Coil Y port Connect the other end of this cable s to Cable 655 452 Connect the other
13. 09 Query instrument IEEE 488 address ADDR term XX term Returns two ASCII digits XX of the IEEE 488 address between 01 and 31 Default 09 Set instrument IEEE 488 EOI status END X term Nothing END return requires END One ASCII digit X sets IEEE 488 EOI status 0 EOI enabled EOI set with last data byte in transmission 1 EOI disabled No EOI is set with last data byte in transmission Default 0 Query instrument IEEE 488 EOI setting END term X term Returns one ASCII digit X indicating IEEE 488 EOI setting 0 EOI enabled EOI set with last data byte in transmission 1 EOI disabled No EOI is set with last data byte in transmission Default 0 Set instrument IEEE 488 terminators TERM X term Nothing Terminator setting return requires TERM One ASCII digit X sets instrument terminators 0 CR lt LF gt 1 LF lt CR gt 2 lt LF gt and 3 None EOI must be set active with the END command Default 0 Query instrument IEEE 488 terminator setting TERM term X term Returns one ASCII digit X IEEE 488 terminator setting 0 CR LF 1 LF CR 2 lt LF gt and 3 None Default 0 5 5 Lake Shore Model 9300 Cryogenic VSM User s Manual 5 2 4 Reading Setup and Reading Commands ALLR Sent Returned Remarks EMUR Sent Returned Remarks EMUR Sent Returned Remarks EMUTC Sent Returned Remarks EMUTC Sent
14. 3 7 19 etc depending on the status of the more significant bits If the low limit is activated then the one s bit 0 i e 2 6 18 etc If the high limit is activated then the two s bit 0 i e 1 5 17 etc These are easy to check from a programming standpoint with bit arithmetic 64 AUTOMATIC VALVE CONTROL The Model 9300 flow cryostat is equipped with automatic valve control for both the flow control needle valve and the sample space evacuation solenoid valves Communication codes are described in Paragraph 6 3 6 4 4 Flow Control Valve Proper operation of the flow control valve depends on correctly initializing the valve controller The following procedure explains how to initialize the flow control valve 1 Power up the system and start the Virtual Temperature Control software This can be started directly or by starting the IDEAS VSM experiment Click the FourAxis button on the Windows task bar to bring up the Motion Controller software Select the Front Panel menu Be sure that Motor 2 is active Click the Motor Off radio button Manually tighten the needle valve as far as possible The valve stem turns clockwise to tighten but the motor shaft turns counter clockwise Click the Motor On radio button Click inside the Move To edit box and type 20 Then click on the Move button Click the Set Origin button The current position should read 0 Close the front panel and minimize but do not exit the FourA
15. 9300 either directly measures the parameters below or derives them Hysteresis Loops Minor Hysteresis Loops Saturation Magnetization Msar Initial Magnetization Curve Retentivity or Remanent Magnetization AC Remanence Coercivity Hc DC Remanence Slope at value of dM dH Vector Measurements m my or Differential Susceptibility at Hc Magnetization as a function of time Switching Field Distribution Magnetization as a function of temperature Flatness for transition temperature and Curie point Squareness Ratio determinations 4 2 K to 1273 K with optional Hysteresis Loss Ws cryostat and or oven 1 2 2 Sample Materials The Model 9300 measures the magnetic moment of any magnetic material in any form except gases The only constraint is sample size it must fit into the sample holder 1 2 3 Computer Requirements 1 Minimum 486 PC compatible 16 MB RAM VGA compatible color monitor 10 MB disk space Recommended Pentium PC compatible 32 MB RAM SVGA compatible color monitor 10 MB disk space 2 National Instruments GPIB PCII PCIIA IEEE 488 2 AT GPIB TNT Legacy interface card 1 2 4 System Elements The VSM includes IDEAS VSM Software a Windows menu driven enhanced color graphic software for system operation data acquisition and analysis It includes individual instrument drivers for complete front panel control of the magnet power supply and VSM control unit Display real time feedback of p
16. Class of IEC 536 see Annex Caution High voltages danger of electric shock Background color Earth ground terminal Yellow Symbol and outline Black Caution or Warning See A instrument documentation Background color Yellow Symbol Frame or chassis terminal and outline Black On supply Equipment protected throughout by Alternating current power line 0 Alternating or direct current power line Three phase alternating current power line Protective conductor terminal Off supply 2 2 5 Cleaning WARNING Disconnect all sources of power to the system before attempting any cleaning No cleaning schedule is needed for normal use If you wish to clean any of the equipment use a damp cloth to clean the outside of the instruments Use a vacuum to clean out the vents 2 3 LINE INPUT ASSEMBLY On the rear of most Lake Shore instruments is Table 2 1 Sample AC Line Input List the line input assembly Figure 2 5 It contains the line voltage line fuse cns and Indicator Line Voltage Range Fuse Slow Blow power cord connector Verify appropriate line 100 90 105 VAC A 50 60 Hz voltage setting and correct line fuse for all system 120 108 126 VAC A 50 60 Hz instruments before initial power up A table z similar to Table 2 1 appears on the rear of most 220 198 231 VAC 50 60 Hz Lake Shore instruments The factory configures 240 216 252 VAC A
17. Liquid Helium Transfer 3 8 Installation Lake Shore Model 9300 Cryogenic VSM User s Manual 3 2 1 Connecting the Model 241 1 Plug the Model 241 cable with the DB 9 connector on one end into the Model 241 DB 9 port Plug the other end into the Dewar 4 Pin Output TRANSVERSE FIELD MAGNETS ONLY The dewar has a flange with two 4 Pin Outputs This redundancy is for the sake of reliability Plug the other end of the DB 9 Cable into either Power Cord to _ Power Supply DB 9 Connector To Computer gt Serial B Port Parallel Field one of the Dewar 4 Pin Outputs 2 Plug serial cable from the Model 241 serial port to computer Serial B port 3 Plug the Model 241 power transformer into the Model 241 power port Plug the transformer into the power supply Turn on the Model 241 Magnet To Dewar 4 Pin Output NOTE For parallel field magnets calibrate the Model 241 liquid helium level monitor for an 11 inch probe For transverse field magnets calibrate for a 23 probe See the Model 241 User s Manual for details Transverse Field 3 2 2 Warm Transfer Magnet If the dewar is at room temperature or contains no liquid helium perform the warm transfer procedure below Read all the steps before performing the procedure NOTE Pre cooling the dewar with liquid nitrogen is strongly recommended 1 Open the Vent Valve to release any helium pressure in the system dewa
18. YOU ACKNOWLEDGE RU ARE YOU BELL BACKSPACE FEO HORIZONTAL TAB TAB LINE FEED NEW LINE NL VERTICAL TAB VTAB FORM FEED FORM PAGE CARRIAGE RETURN EOL SHIFT OUT RED SHIFT SHIFT IN BLACK SHIFT DATA LINK ESCAPE DCO XON READER ON TAPE PUNCH ON XOFF READER OFF TAPE PUNCH OFF NEGATIVE ACKNOWLEDGE ERR SYNCHRONOUS IDLE SYNC END OF TEXT BUFFER LEM CANCEL CANCL END OF MEDIUM SUBSTITUTE ESCAPE PREFIX FILE SEPARATOR GROUP SEPARATOR RECORD SEPARATOR UNIT SEPARATOR Appendix D ASCII Character Codes BINARY 0000000 0000001 0000010 0000011 0000100 0000101 0000110 0000111 0001000 0001001 0001010 0001011 0001100 0001101 0001110 0001111 0010000 0010001 0010010 0010011 0010100 0010101 0010110 0010111 0011000 0011001 0011010 0011011 0011100 0011101 0011110 0011111 0100000 0100001 0100010 0100011 0100100 0100101 0100110 0100111 0101000 0101001 0101010 0101011 0101100 0101101 0101110 0101111 0110000 0110001 0110010 0110011 0110100 0110101 0110110 0110111 0111000 0111001 0111010 0111011 0111100 0111101 0111110 0111111 Lake Shore Model 9300 Cryogenic VSM User s Manual CHAR NULL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR 50 5 DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS NV IAT TYPE CONTROL CONTROL A CONTROL B CONTROL C CONTROL D CONTROL E CONTROL F CONTROL G CON
19. YY which represent the 8 bit data byte in hex No default Model 735 Controller Remote Operation 5 2 8 ADFILT Sent Returned Remarks ADFILT Sent Returned Remarks APCAL Sent Returned Remarks BUSY Sent Returned Remarks CALCLEAR Sent Returned Remarks CALSAVE Sent Returned Remarks PCAL Sent Returned Remarks PCAL Sent Returned Remarks Model 735 Controller Remote Operation Lake Shore Model 9300 Cryogenic VSM User s Manual Calibration Commands NOTE CALSAVE must be sent to save calibrations Sets filter pole of A D converters ADFILT XXX term Nothing Return requires ADFILT Three ASCII digits XXX indicate the hex value of the A D pole setting The pole is computed in decimal as f pole 10MHz 512 setting The converter sample rate is 1 f pole Convert the pole setting to hex before sending Default 188 50 Queries filter pole setting of A D converters ADFILT term XXX term Returns three ASCII digits XXX which indicate the hex value of the A D pole setting Default 188 50Hz Initiates instrument auto phase calibration APCAL term Nothing Return requires PCAL A large in phase signal should reside in the instrument EMUX input before sending this command It takes at least 10 seconds to complete and BUSY 1 during the task Send CALSAVE to permanently store the calibration Informs user when a long calibration is com
20. ZCAL Auto zero calibrates both X and Y inputs on all ranges Sent ZCAL X term Returned Nothing Remarks One digit X indicates the channel 0 X 1 Y The instrument should have no signal into the EMUX or EMUY input before sending this command It takes at least ten seconds to complete and BUSY 1 during the task Send CALSAVE to permanently store the calibration 5 16 Model 735 Controller Remote Operation Lake Shore Model 9300 Cryogenic VSM User s Manual CHAPTER 6 MODEL 704 REMOTE MOTION CONTROL 6 1 GENERAL This chapter covers Model 704 Remote Motion Control Hardware Paragraph 6 2 RS 232 Commands Paragraph 6 3 and Automatic Valve Control Paragraph 6 4 6 2 HARDWARE The enclosure and input configuration of this instrument is similar to other Lake Shore instruments used in the Model 9300 VSM System It is shipped mounted in the instrument console and with the proper fuse installed for the local voltage requirement Please refer to the label on instrument console for the exact power settings Follow all the safety instruction in Chapter 2 for operate this instrument 6 2 1 Fuse Requirement Use a 1 0 A fuse for 100 120 V 50 60 Hz operation and a 0 5 A fuse for 220 240 V 50 60 Hz operation CAUTION Always disconnect the power cord from the source before changing the fuse 6 2 2 Output and Wiring information There are four DB 9 connectors on the back panel of the instrument to connect up to four stepping motor
21. as the field increases since B H and M are related by Equation 5 then using Equation 6 Bs 4 Ms Gauss 7 The magnetic moment per gram o also reaches a saturation value as the field increases os emu g Ms Gauss p g cm3 8 Appendix A EMU to CGS Translation A 1 Lake Shore Model 9300 Cryogenic VSM User s Manual EXAMPLE 1 Nickel exhibits the properties below at 20 C 6 EMU Density 8 90 g cm3 Saturation Magnetization M 484 1 Gauss Bn The VSM comes with a nickel sample that weighs about 0 09 gm What reading on the VSM would this sample give when saturated First using Equation 8 am os 484 1 8 9 54 4 emu g Then using Equation 3 54 4 0 09 4 9 emu EXAMPLE 2 A thin film of ferromagnetic material on ari a circular aluminum substrate is determined to have a ee AA SQUAFIENESS 21001688 saturation moment of 2 56 10 2 see Figure 1 2 TIME CONSTANT 20 1 SECONDS 22 SWEEP TIME 30 MINUTES TOTAL AREA 641 The sample size is 1 4 inch diameter by 0 05 mil thick What is the saturation magnetization Ms and saturation induction Bs neglect the magnetic properties of the aluminum see Example 4 Figure A 1 Saturation Behavior of Nickel First convert the dimensions to cgs units 1 4 in 0 635 cm 0 05 mil 1 27 10 4 cm Then calculate the sample volume V 19204 4 0 10 5 cm Equation 2 give the
22. chromel alumel thermocouple facilitates temperature measurement and control The High Temperature insert is perfect for measuring Curie temperatures of materials up to 700 C The inherent sensitivity of the 9300 Magnetometer determines Curie temperature at relatively low field intensities The steeper change in magnetic moment significantly increases accuracy 7 3 4 Specifications FUNCTION Extends Model 9300 VSM temperature range Obtains controlled sample zone temperatures to 700 C INSTALLATION Replaces standard VSM insert No Model 9300 modification necessary HEATER Integral 20 420 heater coil POWER REQUIREMENTS 0 to 2 0 A max of well filtered DC Sustain maximum rated temperature with nominal 61 watts Never exceed 80 watts maximum power TEMPERATURE MEASUREMENT AND CONTROL Internal chromel alumel thermocouple senses heater temperature Thermocouple output cables to Model 340 for convenient automatic temperature monitoring SAMPLE ENVIRONMENT Evacuate the sample zone or fill it with gas appropriate to the experiment Options 7 3 Lake Shore Model 9300 Cryogenic VSM User s Manual 7 3 2 Storage Store the insert in any position but preferably in an upright position supported by an insert holder 7 3 3 Sample Holder Cleaning To assure measurement accuracy keep sample holder parts free of contamination High temperatures produced by the High Temperature insert tend to compound contamination Fortunately boron
23. helium Monitor helium level indicator and fill to desired level The standard helium capacity is about 40 liters at a depth of 11 inches This stage requires about 15 to 30 minutes Installation 3 9 Lake Shore Model 9300 Cryogenic VSM User s Manual NOTE Helium transfer efficiency depends on the combined properties of the storage dewar transfer line and receiving dewar Each user determines the optimum transfer characteristics for their type of storage dewar and transfer line as they relate to the 9300 System In an efficient transfer a 40 liter dewar requires about 75 liters for initial filling from room temperature 7 Remove both ends of transfer line Wear cryo gloves when performing this operation CAUTION After a lengthy transfer ice build up may prevent removal of the transfer line or immediate replacement of the transfer port plug Use a gentle hot air gun to warm the transfer port and melt the ice Do not over heat 8 Firmly plug transfer port and close Vent Valve to ensure proper gas flow through leads and prevent air condensation inside dewar 3 2 3 Cold Transfer If the system already has liquid helium in the dewar follow the procedure below to perform a cold transfer Read all steps before performing the procedure 1 Open the Vent Valve to release any helium pressure in the dewar during transfer 2 Insert one end of transfer line into liquid helium storage dewar See Figure 3 18 Position the end of the transfer
24. input assembly on the instrument rear panel Turn the line power switch OFF Remove the instrument power cord With a small screwdriver release the drawer holding the line voltage selector and fuse Slide out the removable plastic fuse holder from the drawer Rotate the fuse holder until the proper voltage indicator shows through the window Verify the proper fuse value Re assemble the line input assembly in the reverse order Verify the voltage indicator in the window of the line input assembly 10 Connect the instrument power cord 11 Turn the line power switch ON 0 5940 mr RON 2 3 3 Fuse Replacement To replace a line fuse use slow blow fuses with the proper value shown in the table on the rear of the instrument To change line input from the factory setting use the appropriate fuse in the connector kit shipped with the instrument 1 Locate line input assembly on the instrument rear panel 2 Turn the power switch OFF 3 Remove the instrument power cord 4 With a small screwdriver release the drawer holding the line voltage selector and fuse 5 Remove fuse and replace it with appropriate slow blow fuse 6 Re assemble the line input assembly in reverse order T Verify voltage indicator in line input assembly window Power On Off Screwdriver Fuse Switch Slot Drawer 8 Connect the instrument power cord 9 Turn the power switch ON Figure 2 5 Line Input Assembly 2 3 4 Power Lake Shore ins
25. magnetization m V 2 56 10 2 4 0 10 5 emu cm 640 Gauss and Equation 7 gives the induction Bs 4 Mg 4 640 8040 Gauss The translation between Bohr magnetons f per atom to emu and vice versa involves more steps but it is a straightforward calculation involving keeping track of units The units for are erg Gauss but 1 erg Gauss 1 emu 9 and 1 f 0 9274 10 20 erg Gauss 0 9274 10 29 emu 10 The sensitivity of the VSM is quoted as 5 10 5 emu it may also be quoted in terms of the Bohr magneton 5 10 5 emu 5 4 1015 11 2 Appendix A EMU to CGS Translation Lake Shore Model 9300 Cryogenic VSM User s Manual EXAMPLE 3 The ferromagnetic material y Fe203 has a reported saturation magnetization of 1 25 R Fe atom What is the saturation moment of a piece of tape 1 4 inch square with 0 05 mil coat of Fe203 y Fe203 has the following physical properties Molecular Weight 159 7 g mole Density 3 7 g cm First convert the dimensions to cgs units 1 4 in 0 635 cm 0 05 mil 1 27 10 4 cm Then calculate the volume of the sample V 124 5 12 10 5 cm3 Next determine the mass mass pv 4 7 5 12 10 5 2 4 104g Calculate the number of Fe atoms There are two atoms per molecule and Avogadro s number is 6 02 1023 mole 2 4 104g 1 8 1018 Fe atoms Finally calculate the moment MAGNETIZATION RETENTIVITY COERCIVITY
26. nitride is a relatively inert material Use a strong cleaning solution without fear of damage to sample holder parts In most instances a solution of 50 concentrated hydrochloric acid and 50 concentrated nitric acid suffices 4 Pin for Heater Connection 8 Pin 10 Pin for Coil for Model 340 Connection Connection Standard VSM Insert 4 Pin for Heater Connection 8 Pin 10 Pin for Coil for Model 340 Connection Connection Vacuum lt High Temperature VSM Insert F 9300 7 2 eps Figure 7 2 Top View of Standard and High Temperature VSM Inserts 7 4 Options Lake Shore Model 9300 Cryogenic VSM User s Manual APPENDIX A EMU TO CGS TRANSLATION Though the EMU is the output unit of the VSM many areas of study rely on units of measurement other than EMU The world is slowly adopting the International System of Units SI but most existing literature uses the Gaussian System of Units CGS To avoid unnecessary complications this section uses CGS almost exclusively Refer to a general physics reference text for CGS to SI translation This section details how to translate EMU to CGS in regard to two general areas Ferromagnetic Materials and Paramagnetic and Diamagnetic Materials A 1 FERROMAGNETIC MATERIALS Ferromagnetism is a property of materials with an abnormally high magnetic permeability a definite saturation point appreciable residual magnetism and hysteresis Properties cha
27. of one of four auxiliary relays RELAY X Y term Nothing Relay state return requires RELAY One ASCII digit X indicates desired relay 1 Auxiliary Relay 1 2 Auxiliary Relay 2 3 Auxiliary Relay 3 4 Auxiliary Relay 4 One ASCII digit Y is the relay state 0 Normal 1 Active Default 0 Query the state setting of an auxiliary relay RELAY X term Y term One ASCII digit X indicates desired relay 1 Auxiliary relay 1 2 Auxiliary relay 2 3 Auxiliary relay 3 4 Auxiliary relay 4 Returns one ASCII digit Y which is the relay state 0 Normal 1 Active Default 0 5 2 7 Sent Returned Remarks BEEP Sent Returned Remarks IDSW Sent Returned Remarks POKE Sent Returned Remarks POKE Sent Returned Remarks PON Sent Returned Remarks XMEM Sent Returned Remarks XMEM Sent Returned Remarks 5 14 Lake Shore Model 9300 Cryogenic VSM User s Manual Miscellaneous Commands Sets main board beeper on or off BEEP X term Nothing Beeper setting return requires BEEP One ASCII digit X specifies beeper setting 0 OFF 1 ON Default 0 Query beeper setting BEEP term X term One ASCII digit X indicates beeper setting 0 OFF 1 ON Default 0 Query the four ID switches on the instrument main board IDSW term X term Returns one ASCII digit X which represents the switch states as a hex n
28. output to the COUT setting value COUT is always active and will not stop a ramp Query field output setting The X field is an eight character ASCII representation of a binary floating point number percent of full scale field output The range and resolution are 100 000 to 100 000 Default 00000000 0 NOTE COUT always returns the field output even if COUT is not used to set it Model 735 Controller Remote Operation RAMP Sent Returned Remarks RMPRT Sent Returned Remarks RMPRT Sent Returned Remarks RMPTO Sent Returned Remarks RMPTO Sent Returned Remarks Model 735 Controller Remote Operation Lake Shore Model 9300 Cryogenic VSM User s Manual Query ramp status RAMP term X term One ASCII digit X indicates ramp status 1 ramp active 0 no ramp active Use RAMP when CMODE 1 Default 0 Set ramp rate in percent of full scale field output min RMPRT XXXXXXXX term Nothing Return requires RMPRT The X field is an eight ASCII character representation of a binary floating point number in percent of full scale field output per minute Range and resolution are 0 00 to 100 00 min Default 00000000 0 min Use RAMPRT when CMODE 1 NOTE A ramp initiates only if a non zero ramp rate is set Query the ramp rate setting RMPRT term XXXXXXXX term The X field is an eight ASCII character represent
29. voltage which sets the output current of Model 620 622 The Model 735 Maximum Output is a ratio of Model 735 Program Output 10 V to Model 620 622 reference current 100 A scaled by the maximum current of the magnet Calibration 4 3 Lake Shore Model 9300 Cryogenic VSM User s Manual The second variable to be calculated is the Ramp Rate Limit The Ramp Rate Limit is determined by the allowable ramping voltage of the magnet which is supplied with the magnet data sheet Maximum Voltage ir drop in leads magnet inductance ramp rate limit Maximum Voltage R ohms RR A s assume ir drop in leads negligible RRL G minute RR A s 60 s minute Magnet Constant G A NOTE 2 For IDEASVSM the Ramp Rate Limit is in G minute Table 4 2 Constants for Field Monitor Read Superconducting Magnet Constant G A variable see magnet data sheet Model 620 622 Monitor Output Constant V A 0 01 V A Model 735 Field Input Gain Constant none Inverse Magnet Constant 620 622 Monitor Constant Field Input Scale Factor 10 Model 735 Field Input Scale Factor G V Maximum Gaussmeter Range Maximum Voltage Input 300000 G 3 V Range 0 Offset in Read Circuit Model 620 622 Monitor Out offset Model 735 Field Input offset The Field Input Scale Factor parameter is influenced by the electromagnet VSM design Note the 300000 G 3V this is the Maximum Field Range of the Model 450 Gaussmeter used in the electromagnet
30. zero SHROUD Limit Switch Assembly i r mh m A Le _ 1 as I o om E gt NEM NEN F 9300 7 1 eps Figure 7 1 Rotation Option Installation 7 2 Options Lake Shore Model 9300 Cryogenic VSM User s Manual 7 3 HIGH TEMPERATURE VSM INSERT OPTION The High Temperature insert option allows the Model 9300 to investigate magnetic properties of materials over a temperature range from near absolute zero to 700 C This convenient high efficiency accessory made of non magnetic materials similar to a standard VSM insert The sample zone temperature range extends to 700 C and it requires only 61 watts to maintain this temperature Even at the highest operating temperature outer case temperature is maintained lt 130 C at the hottest spot The inner sample zone chamber is lined with stainless steel for easy cleaning The sample holder consists of a quartz tube extension attached to a boron nitride sample cup The High Temperature insert installs in the 9300 similarly to a standard insert However a vacuum pump out port replaces the standard 10 pin connector for the Model 340 To exclude atmospheric oxygen which may react with the sample either evacuate the sample zone or fill it with an inert gas Magnetically observe oxidation reduction reactions by back filling with appropriate gas mixtures A
31. 0 Oe and 10000 Oe The Model 735 VSM Controller must pass a range linearity test It must meet the range to range and full range linearity specifications Therefore calibration on a single range insures the overall calibration of the electronics Lake Shore performs moment offset calibrations Additional moment offset adjustments should not be required but Lake Shore allows for software offset corrections to the moment readings The Model 735 operates the Model 620 622 Magnet Power Supply to accurately measure the applied magnetic field at the sample and to control the magnetic field Lake Shore calibrates both the gain and the offset of the measurement control loop to specification accuracy during final assembly and testing Calibration 4 1 Lake Shore Model 9300 Cryogenic VSM User s Manual 4 2 1 Moment Calibration for the Model 735 The Model 735 moment calibration is a software calibration After positioning the nickel sample in a saturating field H gt 3500 Oe the user initiates the software calibration procedure via the IDEASVSM menu item The IDEASVSM Software Manual details how the software calibration functions and how to perform this procedure 4 2 2 Moment Offset Calibration for the Model 735 Electronic and embedded software adjustments in the VSM controller eliminate 99 9 of the Model 735 moment offset calibrations For the Model 735 Lake Shore moment offset adjustments are made on a per range basis resulting in a f
32. 0 VSM MODEL 151H FURNACE 0 100 200 300 TEMPERATURE 400 Figure A 3 Curie Point of Nickel 500 07 06 05 04 03 02 MAGNETIG MOMENT EMU A 3 Lake Shore Model 9300 Cryogenic VSM User s Manual 2 PARAMAGNETISM AND DIAMAGNETISM Paramagnetic material is slightly more permeable than a vacuum and has a moment parallel to and proportional to the magnitude of the applied magnetic field Diamagnetic material is slightly less permeable than a vacuum The parameter most often encountered in paramagnetism and diamagnetism is susceptibility However since there are several types of susceptibility it is easy to become confused unless the particular type is specified The VSM reports the total magnetic moment m of a sample in emu This moment can be converted to susceptibility units through the equation 1 emu 1 Gauss cm The susceptibility of a sample has units of volume and is defined for paramagnetic material by the equation 3 m emu Gauss cm H Oersted 13 VSM sensitivity is 5 1075 emu For a field of 50 kOe this corresponds to a susceptibility change of y 5 105 5 104 1 109cm3 14 Other types of susceptibility include gram specific molar atomic volume Gram Specific Susceptibility yg y mass 15 Units cm3 gram Molar Atomic Susceptibility ym yg Mol wt 16 Units
33. 10 amps output from the front panel the total output of the power supply will be 20 amps 2 Use the Function Menu key and Instr Setup menu item to configure the power supply FLDENABLE ON IMAX magnet maximum current BUNITS kG COMPLIANCE magnet maximum ramping voltage kG A magnet constant Input all information from the magnet data sheet into the Model 620 622 memory When properly configured the Model 620 622 can be used to set fields from the front panel see Note 1 above Additional parameters complete the field control configuration of the Cryogenic VSM The Model 620 622 must be integrated to be used with the Model 735 VSM Controller Tables 2 1 and 2 2 list a number of constants which must be configured for IDEASVSM to properly Set Read the magnetic field Table 4 1 Constants for Field Programming Set Superconducting Magnet Constant G A variable see magnet data sheet Model 620 622 Remote Program Constant V A 0 1 V A Model 735 Program Output Constant V G Max Output Superconducting Magnet Max Field Model 735 Maximum Output V 10 V Superconducting Magnet Max Current 100 A Superconducting Magnet Maximum Field G Superconducting Magnet Maximum Current A Superconducting Magnet Ramp Voltage Limit V Superconducting Magnet Ramp Rate Limit G minute Two variables require calculation for the field control setup The Model 735 Maximum Output must be set properly in order to limit Model 735 Program Output
34. 2 GENERAL c o tie bep 4 2 4 4 HARDWARE 4 3 4 4 1 Model 620 622 Magnet Power Supply Configuration 4 3 4 5 SOFTWARE CONFIGURATION iix dentem eaten e 4 4 Table of Contents i Lake Shore Model 9300 Cryogenic VSM User s Manual TABLE OF CONTENTS Continued Chapter Paragraph Title Page 46 EDXANMPEE 4 5 5 MODEL 735 CONTROLLER REMOTE 5 1 5 1 5 THIEEE 488 INTERFACE u ec NE eeu ie 5 1 5 1 1 Interface 5 1 5 12 iere a dere dee parade cere ed ey re para due Poe Te E edere 5 1 5 1 3 Interface Settings ENE ATATA edd 5 1 5 14 Interface VED isi eee abit 5 1 5 125 Example IEEE Setup and Program ertet neh 5 2 5 1 5 1 6 Board Installations iiri 5 2 5 1 5 2 Running The Example QuickBasic 5 2 5 1 6 Notes On Using the IEEE 5 2 5 2 IEEE 488 C
35. A 1 Saturation Behavior of A 2 A 2 Thin Film Saturation BEHAVIOR tato ttbi E E 3 A 3 Foant of NICKEL bade ease oie in e Ee RA A 3 A 4 Moment vs Field Plot of Aluminum U U A 4 B 1 Thin Film Sample Holders u uu un a e e haqa r a a a e B 1 B 2 Capsule Sample 9 2 Table of Contents iii Lake Shore Model 9300 Cryogenic VSM User s Manual LIST OF TABLES Table No Title Page 2 1 Sample AG Line Input List icri enn e Eee ee 2 7 4 1 Constants for Field Programming Set 4 3 4 2 Constants for Field Monitor 2 2 224 1 11 00 4 4 4 3 IDEAS VSM Software Configuration File Entry Points Field Control 4 4 4 4 M735init ini Configuration File Using Magnet 001 4 5 4 5 Probedat ini Configuration File Using Magnet A001 4 5 5 1 Sample BASIC IEEE 488 Interface Program u 5 3 6 1 Experimentally Determined PID and Heater Range Settings for 5 6 11 A 1 Ferromagnetic Terms and nennen nennen 4 C 1 Standard VSM Insert PINOS sairia
36. B 2uV 2B 200 nV Set filter time constant for both X and Y EMU inputs EMUTC X term Nothing Time constant return requires EMUTC One ASCII digit X sets filter time constant 0 10s 1 3 s 2 1 s 3 300 ms 4 100 ms Default 0 Query filter time constant setting for X and Y EMU inputs EMUTC term X term Returns one ASCII digit X indicating filter time constant 10s 1 3 2 1 5 3 300 ms 4 100 ms Default 0 Model 735 Controller Remote Operation HEAD Sent Returned Remarks HEAD Sent Returned Remarks NEWR Sent Returned Remarks OLDR Sent Returned Remarks QUAD Sent Returned Remarks QUAD Sent Returned Remarks Lake Shore Model 9300 Cryogenic VSM User s Manual Set head drive on or off HEAD X term Nothing Head setting return requires HEAD One ASCII digit X sets head drive on or off 0 OFF 1 ON Default 0 Query head drive setting HEAD term X term Returns one ASCII digit X indicating head drive status 0 OFF 1 ON Default 0 Query the newest reading data in the 100 point data buffer NEWR term NNN XXXXXXXX YYYYYYYY FFFFFFFF TTTTTTTT term number of data sets to be sent between 1 and 100 NNN three ASCII digits of an integer number of readings that follow The X Y and F fields are three eight character ASCII representations of a binary floating point number X field voltage present at C
37. Cryogenic VSM with a 9 Tesla magnet configure the Model 620 MPS and Model 735 VSM Controller with the following information from the magnet data sheet 1 Magnet Serial A001 Field Current 2000 G A Maximum Field 90000 G Maximum Current 45 A Maximum Compliance Voltage 2 V Magnet Inductance 30 H PB 09 I Maximum Output and Ramp Rate Limit Table 4 4 m735init ini configuration file using magnet 001 calculations Maximum Output 10 V 45 100 oe oi M 2 V R ohms RR A s assume ir drop in leads negligible RR G minute RR A s 60 s minute fomm RR G minute 2 30 60 2000 8000 Ramp rate limit Model 735 Field Input Gain Calculation z Table 4 5 probedat ini configuration file gain Field Sensitivity inverse Magnet Constant Model using magnet A001 620 622 Monitor Output Constant Model 735 Field Input Scale mM Factor Probe Description Oal _450 ae gain 1 0 1 2000 A G 0 01 V A 300000 3 G V 0 5 Probe Description wa Field Sensitivity 2 a ways Data gain Data offset variable Calibration 4 5 4 6 Lake Shore Model 9300 Cryogenic VSM User s Manual This Page Intentionally Left Blank Calibration Lake Shore Model 9300 Cryogenic VSM User s Manual CHAPTER 5 MODEL 735 CONTROLLER REMOTE OPERATION 5 0 GENERAL This chapter covers the Model 735 IEEE 488 Interface Pa
38. GPIB PCII IIA card using National Instruments instructions 2 Install NI 488 2 software for DOS Version 2 1 1 was used for the example 3 Verify that config sys contains the command device gpib pc gpib com 4 Reboot computer 5 Run IBTEST to test software configuration Do not install the instrument before running IBTEST 6 Run IBCONF to configure the GPIB PCII IIA board and dev 9 Set the EOS byte to OAH IBCONF modifies gpib com 7 Connect the instrument to the interface board and power up the instrument Verify address as 9 and terminators as CR LF 5 1 52 Running The Example QuickBasic Program Copy c gpib pc Qbasic qbib obj to the QuickBasic directory QB4 2 Change to the QuickBasic directory and type link q qbib obj bqlb4x lib where x 0 for QB4 0 and 5 for QB4 5 This one time only command produces the library file qbib qlb The procedure is found in the National Instruments QuickBasic readme file Readme qb 3 Start QuickBasic qb qbib qlb Start QuickBasic in this way each time the IEEE interface is used to link in the library file 4 Create the IEEE example interface program in QuickBasic See Table 5 1 Name the file ieeeexam bas and save 5 Run the program 5 1 6 Notes On Using the IEEE Interface To chain commands or queries together insert a semi colon between them Multiple queries cannot be chained The Model 735 responds to the last query entered when addressed
39. GS Translation Lake Shore Model 9300 Cryogenic VSM User s Manual APPENDIX B SAMPLE HOLDERS B 1 GENERAL This section describes thin film Paragraph B 2 and capsule Paragraph B 3 sample holders B 2 THIN FILM SAMPLE HOLDERS Three each of two different thin film sample holders come with the Model 9300 1 Side Mount Thin Film Sample Holder 2 Bottom Mount Thin Film Sample Holder The side mount sample holder mounts the sample perpendicular to the field The bottom mount mounts the sample parallel to the field Suggested adhesives to mount sample films to the holders include 1 TACKIWAX by CSC Scientific Co Inc 2 Beeswax 3 Duco Cement by E I DuPont de Nemours 4 Double coated Scotch tape by 3M Thin Film Bottom Mount Thin Film Side Mount lt 1 125 gt 0 625 L 8 32 lt 8 32 UNC 1 TAP D UNC 1 TAP 0 5 DEEP 0 5 DEEP ye SAMPLE SAMPLE Figure B 1 Thin Film Sample Holders POSITIONING A SAMPLE WITH BOTTOM MOUNT SAMPLE CUPS When measuring samples parallel to the magnetic field it is advantageous to use bottom mount cups because sample orientation is not critical When measuring samples with weak signals lt 005 emu bottom mount cups allow positioning before the sample is inserted NOTE For samples with larger signals gt 005 emu use the normal method to position the sample 1 Turn on the VSM hardware and software using the standard procedure 2 Place an empty botto
40. Inserting Cryostat and Attaching Pump 2 4200 00000000 3 3 3 6 Connecting Relay Cable to Model 340 3 3 3 7 Connecting Solenoid Valve Assembly to 1 mener 3 3 3 8 IDEAS 340 Relay Switch BUttOn uicit ids itte at eoi deiade etel ad ecd 3 3 3 9 Installirig the V SM Insert uendere miuus 3 4 3 10 Connecting Model 340 to VSM Insert l mener nennen nnns 3 4 3 11 Connecting MPS to Superconducting Magnet 3 5 3 12 Installing the Sample Inlet Valve Stepper nnne 3 5 3 13 Connecting the Model 735 to the 3 6 3 14 Connecting the Model 735 to the VSM 3 6 3145 Mo ntng Structure Em 3 7 3 16 Installing the VSM Drive Connecting the Model 735 and Model 704 to the Drive 3 7 3 17 Helium Transfer ier trt tt 3 8 3 18 Connecting the Model 241 3 9 3 19 Helium Transfer Port with 3 9 4 1 Block Diagram of VSM Field Measurement Control 4 2 7 1 Rotation Option 7 3 7 2 Top View of Standard and High Temperature VSM 7 5
41. OMMAND 5 5 4 5 2 1 Gommahd EISUOSITUCIIEO cse u ates at eben diu E 5 4 5 2 2 Common Commands 554 order 5 5 5 2 3 Interface Command 5 5 5 2 4 Reading Setup and Reading 5 6 5 25 Field Setting EEEE EE E ia bes 5 9 5 2 6 5 12 5 2 7 Miscellaneous e 5 14 5 2 8 Calibration 5 4 2 000000000 5 15 6 MODEL 704 REMOTE MOTION 24 10440581110 nns 6 1 6 EM 6 1 6 2 MODEL 704 MOTION CONTROLLER RS 232 8 0 1000000000000000000000 6 1 6 2 1 Communication RS 232 and 6 1 6 2 2 Normal Initial Setup 6 2 6 2 3 Sample of Typical Operations s uy u u L ana Ra Y h Aap mm AS ta h quan bus 6 2 6 6 3 6 3 1 Flow Control ValVe u u amsa s eb ze 6 3 6 3 2 Sample Space Evacuation a nn nennen 6 4 reo gel tcc E 7 1 Td VEGT
42. OMPLETE PARAMETER INITIALIZATION INITIALIZATION EMU Range 1043 1043 OER Range v 10 3 Time 5 Peak Field 10 3 100 3 Min Temp 0 0 Initial Temp MIN MIN Offset OFF OFF Expand 1 1 Sweep Mode Current Current Sample Drive OFF Time Constant 100 ms GPIB address F1 T 9 Max Gauss Range F2 10 3 Curve Length F3 A 1000 Degauss Parameters F4 5 01 1 2 Fast Mode F5 s 0 RS 232 Baud Rate F6 9600 RS 232 Stop Bits F7 11 RS 232 Echo F8 10 OFF RS 232 Parity On Off F9 10 RS 232 Parity Even Odd 10 u 1 ODD RS 232 Word Size 7 8 F11 18 12 10 OFF Terminator CR CRLF 13 x 13 CR Step Mode F14 0 1 2 OFF Playback Mode F15 0 Delimiter 144 Service Request Mask T 0 Means that the parameter retains the value in effect at last power down Means that the parameter is not affected by GPIB DEVICE CLEAR or DCL command Appendix E Parameter Default Values E 1 2 Lake Shore Model 9300 Cryogenic VSM User s Manual This Page Intentionally Left Blank Appendix E Parameter Default Values
43. OROBTETION s ttem PNE e Mont anti 7 1 FAVA Calibration reu er etre Uie eee lac Bae 7 1 7 2 ROTATION OPTION e Tc RTI aa i ta ae 7 2 1 2 1 Installation nett Hera ute a 7 1 1 2 2 Wiring IpfOorrmiation oe be 7 4 7 3 HIGH TEMPERATURE VSM INSERT 8 7 5 1 31 E 7 5 7 3 22910 DD 7 4 1 3 3 Holder Cleaning 7 4 APPENDIX EMU CGS 22 2 2 nana nnns sn nn tinm 1 FERROMAGNETIC 5 0 2 1 2 PARAMAGNETISM AND DIAMAGNETISM 1 4 ii Table of Contents Lake Shore Model 9300 Cryogenic VSM User s Manual TABLE OF CONTENTS Continued Chapter Paragraph Title Page APPENDIX B SAMPLE HOLDERS 2 1 BHiFGENERA 1 B 2 THIN FILM SAMPLE 5 1 POSITIONING SAMPLE WITH BO
44. Paragraph 2 1 2 Secure the drive with thumb nuts and level it 26 Connect Cable 653 145 from the Model 735 Head Feedback port to the 5 Pin Drive Connector Connect Cable 653 144 from the Model 735 Head Drive port to the 3 Pin Drive Connector Figure 3 16 27 Connect the Z Motor Cable from the Model 704 Motor C port to the Z Motor Drive Connector Figure 3 16 Connect a serial cable from the Model 704 serial port to the computer Serial A port 28 Click the IDEAS 340 Relay Switch button off Figure 3 8 Push the Flush Switch toward Flush and remove the rubber stopper from the top of the VSM Insert Figure 3 9 29 Slide forward the Mounting Structure Top Plate and securely thread the drive coupling onto the top of the VSM Insert Remove the Stopper on top of the drive insert the Sample Rod then replace the Stopper Figure 3 16 30 Turn the Flush Switch off click the IDEAS 340 Relay Switch on and pump out the sample space for about 10 Lateral Movement Screws Forward Stop Adjustment Screw Figure 3 15 Mounting Structure Stopper SIDE VIEW 7 3 5 Motor Head Drive Feedback Connector Connector Connector Ls So Thumb Nut Coupling Figure 3 16 Installing the VSM Drive Connecting the Model 735 and Model 704 to the Drive minutes The system is ready to perform a measurment
45. Pinouts mw 5 7 Sepe 5 J lt amp j Sid SSS amp gt _ T 7 Sensor E e L Sensor ge F j Table C 2 Transverse VSM Signal Cable Pinouts X amp Y z eo sme sx p C wuewne 1 v White Black 4 Table C 5 Flow Cryostat Needle Valve Stepper Motor Cable Pinouts 9 PIN FUNCTION COLOR CONNECTOR Wue d 4 Table C 4 Solenoid Valve Cable Pinouts 6 PIN FUNCTION COLOR CONNECTOR c Re no _ Table C 3 Model 241 Cable Pinouts 4 1 9 PIN CONNECTOR SIGNAL cora Black ae reme Appendix Wiring Tables C 1 Lake Shore Model 9300 Cryogenic VSM User s Manual Table C 6 MPS External Programming Adaptor Pinouts 18 PIN FUNCTION COLOR CONNECTOR N Table C 7 Model 735 Drive Cable Pinouts Table C 8 Model 735 Feedback Cable Pinouts SIGNAL PIN COLOR SIGNAL PIN COLOR Shield Shield Shield Shield C 2 Appendix C Wiring Tables Lake Shore Model 9300 Cryogenic VSM User s Manual APPENDIX D ASCII CHARACTER CODES Table C 1 Control Character Alternate Code Names CHARACTER MEANING NUL NULL CTRL SHIFT P TAPE LEADER START OF HEADER SOM START OF TEXT EOA ENX OF TEXT EOM END OF TRANSMISSION END ENQUIRY WRU WHO ARE
46. Returned Remarks 5 6 Query all available reading data in the 100 point data buffer ALLR term NNN XXXXXXXX YYYYYYYY FFFFFFFF TTTTTITT term NNN three ASCII digits of an integer number of readings that follow The X Y and F fields are three eight character ASCII representations of a binary floating point number X field voltage present at Channel X input Y field voltage present at Channel Y input F field voltage present at Field input The T field is an eight digit decimal integer representing time in 10ms increments from initial instrument power up until the reading was taken All NNN readings are sent at the same time in order of oldest to newest Data is taken and time stamped every period specified in the READP command from 100 ms to 1000mS If NNN is 100 assume some readings were lost Set range for either X or Y EMU input EMUR X YY term Nothing Range setting return requires EMUR One ASCII digit X sets desired channel 0 Channel X 1 Channel Y Two ASCII digits YY set the range from 00 to 3F hex Default 00 00 2V 01 200 mV 02 20 mV 03 2 mV 07 200 uV 20 uV 1B 2uV 2B 200 nV Query range setting for either X or Y EMU input EMUR XTterm YYT term One ASCII digit X indicates desired channel 0 Channel X 1 Channel Y Returns two ASCII digits YY indicating range from 00 to hex Default 00 00 2 01 200 mV 02 20 mV 03 2 mV 07 200 uV 20 uV 1
47. Safety Symbols ier e E eene teg eee ee ed eoo ete e uv eve done ved 2 7 2 S EINE INPUT ASSEMBLY 5 nidis dier teer diee 2 7 2 3 1 Line Voltage and Fuse Verification S Q D u sS Qa 2 8 2 3 2 i Led Ete erit ecu ien 2 8 2 3 3 Fuse Replacement eie enr oe de tee ire ten edo ene t neces 2 8 2 3 4 pP 2 8 2 3 5 RM 2 8 INSTALLATION m 3 1 3 1 MODEL 9300 SYSTEM INSTALLATION 3 1 3 1 1 Initial Computer Console 3 1 3 1 2 Preparing aie redi beat 3 2 3 2 HELIUM TRANSFER 3 8 32 1 Connecting the Model 24 Treci 2 3 9 3 2 2 Warm 3 9 3 2 3 c et ce p e RT t OR eee t UTR Ute e RERO ODER eda 3 10 4 CALIBRATION mem 4 1 4 1 DESCRIPTION AND 0 4 1 AZ CALIBRATION tc m ut a d mati 4 1 4 2 1 Moment Calibration for the Model 735 2220020 000 0 a 4 1 4 2 2 Moment Offset Calibration for the Model 735 4
48. TROL H CONTROL CONTROL J CONTROL K CONTROL L CTRL M RET CONTROL N CONTROL O CONTROL P CONTROL Q CONTROL R CONTROL CONTROL T CONTROL U CONTROL V CONTROL W CONTROL X CONTROL Y CONTROL Z ESC CONTROL CONTROL CONTROL CONTROL _ SPACE 99 A dk lt gt NV IAT BINARY 1000000 1000001 1000010 1000011 1000100 1000101 1000110 1000111 1001000 1001001 1001010 1001011 1001100 1001101 1001110 1001111 1010000 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 1011001 1011010 1011011 1011100 1011101 1011110 1011111 1100000 1100001 1100010 1100011 1100100 1100101 1100110 1100111 1101000 1101001 1101010 1101011 1101100 1101101 1101110 1101111 1110000 1110001 1110010 1110011 1110100 1110101 1110110 1110111 1111000 1111001 1111010 1111011 1111100 1111101 1111110 1111111 DEC 64 HEX 40 41 42 43 44 45 46 47 48 49 4 4B 4C 4D 4 4 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E gt A lt 79 ZF TN lt XXS lt CHANMAOVOZETACT TOMMIOWFSOA BUTUONXXZ cHdO0OmNoOoUOZz rommoousprqgd 7 lt XK ES CTFTHTFQOQDODZTAT o O 57 lt XK lt lt 0 5 o O O o RUBOUT Appendix D ASCII Character Codes Lake Shore Model 9300 Cryogenic VSM User s Manual APPENDIX E PARAMETER DEFAULT VALUES NORMAL C
49. TTOM MOUNT SAMPLE 5 B 1 B A CAPSULE SAMPLEE HOEDERS ra rera Le eee esu Fa veda re Ea DER eve pa ore ave B 2 APPENDIX C WIRING TABLES 1r e nnnc nc IER ERN FREE C 1 APPENDIX D ASCII CHARACTER C 1 APPENDIX E PARAMETER DEFAULT 2 4 4 125588882 D 1 LIST OF ILLUSTRATIONS Figure No Title Page 1 1 Typical Superconducting Magnet VSM 5 1 3 2 1 Shockwatch and Tip n Tell 2 1 2 2 Drive with Cover 1 41 04 4 444 1 1 trennt prb e nnns nnn 2 2 2 3 9300 VSM System Sample Floor Plan and 2 3 2 4 Cryogenic Storage Doewar ede dtp 2 5 2 5 Line Input Assembly xe eee etn ee tette 2 8 3 1 Initial Computer Console Connections esaa a a 1 ean sn 3 1 3 2 Purmp Assemblya 5 rr ene PRAEDI 3 2 3 3 Dewar Adjustment Rods O Ring and Leveling the Mounting 3 2 3 4 Attaching Solenoid Valve Assembly to Cryostat eene 3 2 3 5
50. anufacturer Field to Current Ratio Model Measured Inductance Rated Central Field 4 2 k Charging Voltage used in test kOe Lake Shore Model 9300 Cryogenic VSM User s Manual Declaration of Conformity Lake Shore Cryotronics Inc 575 McCorkle Blvd Westerville OH 43082 8888 USA hereby declare that the equipment specified conforms to the following Directives and Standards Application of Council directives 73 23 EEC 89 336 EEC Standard to which Conformity is declared EN55022 EN50082 1 EN61010 1 Type of Equipment VSM System Model Number 9300 Z ZZ 12 7797 Signature Date John M Swartz Printed Name President Position Lake Shore Model 9300 Cryogenic VSM User s Manual TABLE OF CONTENTS Chapter Paragraph Title Page 1 INTRODUCTION uu uuu 1 1 Ta GENERAL Udo DR Oma i i tee 1 1 1 2 9300 5 ne e SEWER E 1 1 12231 Measurements atio nde pps a eed 1 1 1 2 2 Sample Malerlals cette Ee Idee E ene dee ote do eap e Poe 1 1 1 2 3 Computer asses assasi 1 1 1 2 4 SystemiEleMents RENAR 1 1 1 2 5 System Options See Chapter 6 u a S u p
51. aracter representation of the current field controlled ramp setpoint in volts per minute Default 00000000 Query field controlled ramp status CONST term X term One ASCII digit X indicates ramp status 0 no field controlled ramp active 1 Field controlled ramp active CONSP approaching CONTO 2 CONSP reached CONTO and controlling to final value Default 0 Set ramp to value for field controlled ramp of field output and initiate a ramp CONTO XXXXXXXX term Nothing Return requires CONTO The X field is an eight ASCII character representation of a binary floating point number in voltage corresponding to the field input Range and resolution are 5 00000 to 5 00000 V Default 00000000 0 NOTE CONTO initiates only if CONRT 0 and CMODE 2 Query ramp to setting for field controlled ramp CONTO term XXXXXXXX term The X field is an eight ASCII character representation of the control destination Range and resolution are 5 00000 to 5 00000 V Default 00000000 0 NOTE CONTO returns the ramp destination Use CONSP to obtain current field setpoint Manually set field output COUT XXXXXXXX term Nothing Return requires COUT The X field is an eight character ASCII representation of a binary floating point number in percent of full scale field output Use COUT when CMODE 0 The range and resolution are 100 000 to 100 000 Default 00000000 0 NOTE COUT ends an active ramp and forces field
52. as a talker Queries generally use the same syntax as an associated setting command followed by a question mark They most often return the same information that is sent Some queries have no command form Add a query to the end of a command string to confirm command execution For example HEAD 1 HEAD commands the Model 735 to set the head on then return the head setting to confirm the change Leading zeros and zeros following a decimal point are unneeded in a command string but they are sent in response to a query A leading is not required but a leading is required term indicates where the user places terminating characters or where they appear on a returning character string from the Model 735 Some numbers are stored in 4 byte binary floating point The numbers are sent over the interface with an eight digit hex representation of the binary number The first bit represents the sign of the mantissa The remaining 7 bits in the first byte are the two s complement binary exponent The last three bytes are the mantissa where 000000 0 and FFFFFF 1 Example 81800000 2 x 5 1 5 2 Model 735 Controller Remote Operation Table 5 1 Sample BASIC IEEE 488 Interface Program EEEEXAM BAS EXAMPLE PROGRAM FOR IEEE 488 INTERFACE This program works with QuickBasic 4 0 4 5 on an IBM PC or compatible 5 example requires a properly configured National Instruments GPIB PC2 card The REM SINCLUDE state
53. ase 3 wire AC power Do not use two wire without ground AC power Ground Fault Interrupter and Transient Surge Protection circuitry at the AC source are also strongly recommended In areas where AC voltage is variable consider a constant voltage transformer If power outages are a problem consider an Uninterruptable Power Supply UPS CAUTION Do not attempt to apply electrical power to the system until all instruments have been checked for proper input power settings and fuse circuit breaker ratings The factory presets Model 9300 electrical component power requirements for proper operation upon receipt Set the input voltage for each instrument in the system on the rear panel Before applying power to the main input power cable verify input power settings for each instrument are correct for the power source voltage Ground instrument panels and cabinets The safety ground provides a true ground path for electrical circuitry and in the event of internal electrical faults such as shorts carries the entire fault current to ground to protect users from electrical shock The Power Strip in the Instrument Console has a three conductor power input connector which grounds equipment in the Instrument Console when plugged into a 3 wire receptacle When the earth ground connection is likely impaired render the Model 9300 inoperative and secure it against any unintended operation The connection is likely impaired if the instrument 1 Shows v
54. at the A D input Range 5 V to 5 V Resolution 18 bits or greater NOTE One A D updates every 100 ms 700 ms to update all seven Set output of auxiliary output D A 1 or 2 AUXDA X YYYYYYYY term Nothing Output setting return requires AUXDA One ASCII digit X indicates output 1 Auxiliary output D A 1 2 Auxiliary output D A 2 The Y field is an eight ASCII character representation of a binary floating point number in percent of full scale for the output Range resolution 100 00 to 100 0096 Default 00000000 0 Query output setting for auxiliary output D A 1 or 2 AUXDA X term YYYYYYYY term One ASCII digit X indicates output 1 Auxiliary output D A 1 2 Auxiliary output D A 2 The Y field is an eight ASCII character representation of the output setting Range and resolution are 100 00 to 100 00 Default 00000000 0 Query auxiliary digital input states AUXDI term XX term Two ASCII digits XX represent the digital inputs as a hex number from 00 to 1F Each input is represented by an individual bit 0 logic low 1 logic high Returns the hex sum of the bit weights Bit weighting is as follows Bit Weight Use 0 01 Digital output 1 1 02 Digital output 2 2 04 Digital output 3 3 08 Digital output 4 4 10 Digital output 5 Hex addition of the bit weights gives all input states Default 00 NOTE Digital outputs and inputs share pins on the auxiliary connector To use a digital line as an in
55. ation of a binary floating point number in percent of full scale field output per minute Range and resolution are 0 00 to 100 00 min Default 00000000 0 min Set ramp to value for current ramp of field output and initiate a ramp RMPTO XXXXXXXX term Nothing Return requires RMPTO The X field is an eight ASCII character representation of a binary floating point number in percent of full scale field output Range and resolution are 100 000 to 100 000 Default 00000000 096 RAMPTO works for CMODE 1 or 2 NOTE A ramp initiates only if a non zero ramp rate is set Query ramp to setting for current ramp RMPTO term XXXXXXXX term The X field is an eight ASCII character representation of a binary floating point number in percent of full scale field output Range resolution 100 000 to 100 000 Default 00000000 0 NOTE RMPTO returns the ramp destination Use COUT to obtain current field output Lake Shore Model 9300 Cryogenic VSM User s Manual 5 2 6 Auxiliary Commands AUXAD Sent Returned Remarks AUXDA Sent Returned Remarks AUXDA Sent Returned Remarks AUXDI Sent Returned Remarks AUXDO 5 12 Sent Returned Remarks Query one of seven auxiliary A D readings AUXAD X term YYYYYYYY term One ASCII digit X indicates the A D input from 1 to 7 The field is an eight ASCII character representation of a binary floating point number which is the voltage
56. c VSM User s Manual Ground Instruments To minimize shock hazard connect instrument chassis and cabinet to an electrical ground Most Lake Shore instruments come with a three conductor AC power cable Plug the power cable into an approved 3 contact electrical outlet or use a 3 contact adapter with the grounding wire green firmly connected to an electrical ground safety ground at the power outlet The power jack and mating plug of the power cable meet Underwriters Laboratories UL and International Electrotechnical Commission IEC safety standards Do Not Operate In An Explosive Atmosphere Do not operate instruments in the presence of flammable gases or fumes Operation of any electrical instrument in such an environment constitutes a definite safety hazard Keep Away From Live Circuits Operating personnel must not remove instrument covers Refer component replacement and internal adjustments to qualified maintenance personnel Do not replace components with power cable connected To avoid injuries always disconnect power and discharge circuits before touching them Do Not Substitute Parts Or Modify Instrument Do not install substitute parts or perform any unauthorized modification to instruments Return the system to authorized Lake Shore representative for service and repair to ensure that safety features are maintained 2 2 4 Safety Symbols Direct current power line double insulation or reinforced insulation equivalent to
57. d for read buffer READP XX term Nothing READP setting return requires READP Two ASCII digits XX set sample period in 0 1 second increments Setting range is 1 0 1 second to 10 1 second Default 1 Query read buffer sample period READP term X term Two ASCII digits XX indicate sample period in 0 1 second increments Range is 1 0 1 second to 10 1 second Default 1 Query reading status for the X EMU Y EMU Field and AUX inputs READS term XX term Two ASCII digits XX indicate overload on the input channels Each digit represents a nibble 0 F of an eight bit status byte 0 no error 1 error present Bit weighting is as follows Bit Weight Use 0 01 A D overload 02 EMUX PSDMON overload 04 EMUX PREMON overload 08 EMUY A D overload 10 EMUY PSDMON overload EMUY PREMON overload Field A D overload 80 Auxiliary A D overload 1 2 3 4 5 20 6 7 Hex addition of the bit weights gives the complete status byte Model 735 Controller Remote Operation 5 2 5 CMODE Sent Returned Remarks CMODE Sent Returned Remarks CONLIM Sent Returned Remarks CONLIM Sent Returned Remarks CONPI Sent Returned Remarks CONPI Sent Returned Remarks CONRT Sent Returned Remarks Model 735 Controller Remote Operation Lake Shore Model 9300 Cryogenic VSM User s Manual Field Setting Commands Set field setting mode CMODE X term Noth
58. edle Valve To Console Power Strip and pull it out from the dewar approximately 6 inches Pump out the Figure 3 7 Connecting Solenoid Valve Assembly to Power valve tube for about 10 minutes then reseat the Needle Valve Figure 3 9 If not pre cooling skip this step IDEAS Model 340 Temperature Controller File Front Panel Loop 2 Utilities Timing Help OMA MME E E el IDEAS 340 Relay Switch Figure 3 8 IDEAS 340 Relay Switch Button Installation 3 3 15 16 17 18 19 3 4 Lake Shore Model 9300 Cryogenic VSM User s Manual Click the IDEAS 340 Relay Switch off Figure 3 8 Push Solenoid Valve Assembly Flush Switch toward FLUSH and remove Insert Pipe Cap Slide the VSM Insert into the Insert Pipe Align VSM Insert Cap Slot with Insert Pipe Locking Nub and turn the VSM Insert clockwise to lock in place Figure 3 9 Plug top of Insert with the supplied rubber stopper and push the Flush Switch away from FLUSH Figure 3 9 Click the IDEAS 340 Relay Switch on Figure 3 8 Plug the Secondary Heater Cable Cable 655 450 from the Model 340 Analog Out 2 port into the 4 pin VSM Insert Input Figure 3 10 The Model 340 tri cable consists of Cable A Cable B and the Primary Heater Cable merging into a 10 pin connector Plug Cable A into Input A and Cable B into Input B Figure 3 10 The Primary Heater Cable ends ina single and dual banana plug The dual connector plugs into the HI and LO outputs T
59. elow maximum charging voltage ir drop in the leads magnet inductance x maximum ramping rate If the magnet leads are large gauge copper brass ir drop can be ignored The maximum ramp rate is the maximum charging voltage magnet inductance in amps second The superconducting magnet field control including ramp rate is configured using the magnet constants and calibrated measure control instrumentation electronics Instrumentation offsets must be calibrated in situ and remenant fields are not accounted for in the field readings 44 HARDWARE CONFIGURATION The Model 9300 hardware configuration including a wiring diagram appears in Section 3 1 2 Specifications and Constants for the superconducting magnet Model 735 and Model 620 622 appear in Table 2 1 4 4 1 Model 620 622 Magnet Power Supply Configuration Model 620 622 configuration is vital to prevent damage to the superconducting magnet The current design of the Cryogenic VSM does not implement digital communication between IDEASVSM and the Model 620 622 but future design enhancements will However the user should know exactly how to configure the Model 620 622 for the superconducting magnet 1 Set INT EXT switches on back panel to V INT EXT see Figure 2 1 NOTE 1 The Model 620 622 adds the Remote Program Input voltage to the front panel settings during operation For example if 1 V is at the Remote Program Input the output current is 10 amps If the user then programs
60. end of Cable 655 452 to the 8 pin connector on the VSM Insert Figure 3 14 TRANSVERSE FIELD MAGNETS ONLY Connect other end of Cable 655 452 to the 8 pin connector on the Dewar Figure 3 14 Lake Shore Model 9300 Cryogenic VSM User s Manual Figure 3 13 Connecting the Model 735 to the MPS Y Coil Optional in Parallel Field Magnets Standard in Transverse Field Magnets Parallel Field Magnet Cable 655 452 To 8 Pin VSM Insert Connecter Transverse Field Magnet To 8 Pin Dewar Connecter Figure 3 14 Connecting the Model 735 to the VSM Insert Installation Lake Shore Model 9300 Cryogenic VSM User s Manual 24 Fit the Mounting Structure onto the Adjustment rods and secure it with thumb nuts The Mounting Structure consists of a Bottom Plate and a Top Plate The Bottom Plate mounts to the Adjustment Rods while the Top Plate slides forward and backward and laterally on the Bottom Plate The Forward Stop Adjustment Screw limits how far the Top Plate slides forward Loosen the Lateral Movement Screws to move the Top Plate laterally Tighten them to lock the Top plate in place Figure 3 15 25 Slide back the Mounting Structure Top Plate and fit the drive onto the Top Plate rods Figure 3 16 Be sure to remove any packing materials from the inside of the drive see
61. er s Manual 3 1 2 Preparing the Dewar 1 Remove the vacuum pump from its shipping box If not already installed clamp the Foreline Trap to the pump with a 25 mm clamp Clamp the pump hose to the Foreline Trap with a 25 mm clamp Figure 3 2 2 Remove the dewar from its shipping crate place it in its planned location and level it Thread the locking nuts onto each of the four adjustment rods then thread the rods into the dewar Lock the rods so that approximately 6 5 of the rod protrudes from the top of the locking nut Figure 3 3 Foreline The dewar comes with O rings taped to its top Inspect one of the O rings for cracks then seat it properly in the top of the dewar Figure 3 3 3 Fitthe VSM Mounting Structure onto the four adjusting rods With the 11 8 inch Open End Wrench turn the adjustment rods until the mounting structure is level After leveling remove the Mounting Structure and set it aside Figure 3 3 4 Remove the cryostat from its shipping crate and carefully lay it on its side or place it in a probe stand recommended Clamp the pump Solenoid Valve Assembly to the cryostat Flush Pipe with a 16 mm clamp Figure 3 4 5 Push the end of the Solenoid Valve Assembly Flush Line onto the ribbed inlet of the Vent Pipe E Temporarily coil up the solenoid Relay Cable so it Adjustment sed S ng is out of the way Figure 3 4 Optional To pre Rod cool the dewar pour 5 liters of liquid nitrogen int
62. evice or assembly from a container must maintain contact with a conductive portion of the container Use only plastic bags approved for storage of ESD material 6 Do not handle ESDS devices unnecessarily or remove from the packages until actually used or tested 2 2 3 Instrument Safety Observe these general safety precautions during all phases of instrument operation service and repair Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended instrument use Lake Shore Cryotronics assumes no liability for Customer failure to comply with these requirements Lake Shore instrumentation protects the operator and surrounding area from electric shock or burn mechanical hazards excessive temperature and spread of fire from the instrument Environmental conditions outside of the conditions below may pose a hazard to the operator and surrounding area Indoor use Temperature 5 C to 40 C Maximum relative humidity 80 for temperature up to 31 C decreasing linearly to 50 at 40 C Altitude up to 2 000 meters Power supply voltage fluctuations not to exceed 10 of the nominal voltage Transient overvoltages according to OVERVOLTAGE CATETORIES 1 Il and IEC 1010 For mains supply the minimum and normal category is II Pollution Degree 2 in accordance with ICE 664 2 6 Pre Installation Lake Shore Model 9300 Cryogeni
63. hannel X input Y field voltage present at Channel Y input F field voltage present at Field input The T field is an eight digit decimal integer representing time in 10ms increments from initial instrument power up until the reading was taken The newest readings are sent at the same time in order of oldest to newest If fewer new readings are available only valid readings are sent All older readings are lost Data is taken and time stamped every period specified in the READP command from 100 ms to 1000mS Query the oldest reading data in the 100 point data buffer NNN XXXXXXXX YYYYYYYY FFFFFFFF TTTTTTTT term number of data sets to be sent between 1 and 100 NNN three ASCII digits of an integer number of readings that follow The X Y and F fields are three eight character ASCII representations of a binary floating point number X field voltage present at Channel X input Y field voltage present at Channel Y input F field voltage present at Field input The T field is an eight digit decimal integer representing time in 10ms increments from initial instrument power up until the reading was taken The oldest readings are sent at the same time in order of oldest to newest If fewer readings are available only valid readings are sent Newer readings are preserved for future retrieval Data is taken and time stamped every period specified in the READP command from 100 ms to 1000mS Set channel Y
64. he single connector plugs into the Shield input Figure 3 10 Plug the 10 pin connector into the 10 pin VSM Insert input Figure 3 10 The Model 340 should now display temperature If not pre cooling shut Vent Valve unseat Needle Valve and pull it out from the dewar approximately 6 inches and pump out the valve tube for about 10 minutes Securely reseat Needle Valve after pumping Figure 3 9 Follow instructions in Paragraph 3 2 to transfer liquid helium from the storage dewar to the magnet dewar NOTE Helium transfer takes several hours to complete Rubber Insert Cap VSM Insert Stopper Slot and B Insert Pipe Locking Nub Needle Valve Figure 3 9 Installing the VSM Insert Ground 9 LJ 69 5 Primary Heater Relay Cable Cable Secondary Heater Cable To 10 Pin To 4 Pin VSM Insert VSM Insert Input N Input e Figure 3 10 Connecting Model 340 to VSM Insert Installation Lake Shore Model 9300 Cryogenic VSM User s Manual 20 Connect the Magnet Power Supply MPS Terminal Cables to the MPS terminals Red positive Black negative Connect the other ends to the magnet terminals on top of the cryostat Figure 3 11 Just to the left of the MON OUT port are two small switches labeled V and voltage and current Set V to INT and to EXT Turn on the MPS 21 Verify the Needle Valve is securely tightened
65. hen a sample material is placed in a uniform magnetic field a dipole moment proportional to the product of the sample susceptibility times the applied field is induced in the sample A sample undergoing sinusoidal motion as well induces an electrical signal in suitably located stationary pick up coils This signal which is at the vibration frequency is proportional to the magnetic moment vibration amplitude and vibration frequency The material under study is contained in a sample holder which is centered in the region between the pole pieces of a laboratory magnet see Figure 2 1 A slender vertical sample rod connects the sample holder with a transducer assembly located above the magnet which supports the transducer assembly with sturdy adjustable support rods The transducer converts a sinusoidal AC drive signal provided by a circuit located in the console into a sinusoidal vertical vibration of the sample rod and the sample is thus made to undergo a sinusoidal motion in a uniform magnetic field Coils mounted on the pole pieces of the magnet pick up the signal resulting from the sample motion This AC signal at the vibration frequency is proportional to the magnitude of the moment induced in the sample However it is also proportional to the vibration amplitude and frequency A servo system maintains constancy in the drive amplitude and frequency so that the output accurately tracks the moment level without degradation due to variations i
66. ich results in electronic devices with even more ESD sensitivity Some electronic parts are more ESDS than others ESD levels of only a few hundred volts may damage electronic components such as semiconductors thick and thin film resistors and piezoelectric crystals during testing handling repair or assembly Discharge voltages below 4 000 volts cannot be seen felt or heard 2 2 2 1 Identification of Electrostatic Discharge Sensitive Components Below are various industry symbols used to label components as ESDS 2 2 2 2 Handling Electrostatic Discharge Sensitive Components Observe all precautions necessary to prevent damage to ESDS components before attempting installation Bring the device and everything that contacts it to ground potential by providing a conductive surface and discharge paths As a minimum observe these precautions 1 De energize or disconnect all power and signal sources and loads used with unit 2 Place unit on a grounded conductive work surface 3 Ground technician through a conductive wrist strap or other device using 1 MO series resistor to protect operator 4 Ground any tools such as soldering equipment that will contact unit Contact with operator s hands provides a sufficient ground for tools that are otherwise electrically isolated 5 Place ESDS devices and assemblies removed from a unit on a conductive work surface or in a conductive container An operator inserting or removing a d
67. id Nitrogen Helium and Nitrogen are colorless odorless and tasteless gases When properly cooled the gases liquify Liquid Helium LHe and liquid nitrogen LN2 may be used in conjunction with the Model 9300 Although not explosive there are certain safety considerations in the handling of LHe and LN Operate all cryogenic containers dewars in accordance with manufacturer instructions Safety instructions are normally posted on the side of each dewar Keep cryogenic dewars in a well ventilated place protected from the weather and away from heat sources Figure 2 4 shows a typical cryogenic dewar Transfer LHe and LN and operate storage dewar controls accordance with manufacturer supplier instructions During transfer follow all safety precautions written on the storage dewar and recommended by the manufacturer WARNING Liquid helium and liquid nitrogen are potential asphyxiants and can cause rapid suffocation without warning Store and use in an adequately ventilated area DO NOT vent the container in confined spaces DO NOT enter confined spaces where gas may be present unless area is well ventilated If inhaled remove to fresh air not breathing give artificial respiration If breathing is difficult give oxygen Get medical attention Liquid helium and liquid nitrogen can cause severe frostbite to exposed body parts DO NOT touch frosted pipes or valves For frostbite consult a physician immediately If a
68. igure 3 1 1 Plug the mouse into the rear computer port with a mouse icon beneath it 2 Plug the keyboard into the rear computer port with a keyboard icon beneath it 3 Plug the Monitor into the rear computer I Console port with a monitor icon beneath it ER 1 4 Plug the monitor power cord into the back of the monitor Plug the other end into the console power strip 5 Plug the computer power cord into the back of the computer Plug the other end into the console power strip 6 Connect a IEEE 488 cable from the computer IEEE port to the Model 735 IEEE port Connect a IEEE 488 cable from the Model 735 IEEE port to the Model 340 IEEE port Connect a IEEE 488 cable from the Model 340 IEEE port to the Model 620 IEEE port 7 Plug the power cords of the Model 735 m 340 and 620 into their respective Console instruments Plug the other ends into the pon console power strip A IEEE 488 Cables 8 Turn on the computer and each instrument to verify they work Turn off the Model 620 but leave the computer and the other instruments on 9 If itis not already loaded load the IDEAS VSM software onto the computer hard drive See the IDEAS VSM Software User s Manual Figure 3 1 Initial Computer Console Connections Installation 3 1 Lake Shore Model 9300 Cryogenic VSM Us
69. in seconds When CMODE 2 the instrument uses the P and I values in a PI control algorithm Default 00000000 00000000 0 0 Query field controlled ramp P proportional and integral parameters CONPI term XXXXXXXX Y Y YY YYY Y term The X field is an eight ASCII character representation of a binary floating point P no units The Y field is an eight ASCII character representation of a binary floating point I in seconds Default 00000000 00000000 0 0 Set field controlled ramp rate CONRT XXXXXXXX term Nothing Return requires CONRT The X field is an eight ASCII character representation of a binary floating point number set in field input volts per minute When CMODE 2 the instrument uses CONRT to approach the CONTO value Default 00000000 0 V min 5 9 CONRT Sent Returned Remarks CONSP Sent Returned Remarks CONST Sent Returned Remarks CONTO Sent Returned Remarks CONTO Sent Returned Remarks COUT Sent Returned Remarks COUT Sent Returned Remarks 5 10 Lake Shore Model 9300 Cryogenic VSM User s Manual Query the field controlled ramp rate CONRT term XXXXXXXX term The X field is an eight ASCII character representation of a binary floating point number set in field input volts per minute Default 00000000 0 V min Query current field controlled ramp setpoint CONSP term XXXXXXXX term The X field is an eight ASCII ch
70. inal offset typically less than 0 01 of the full scale of the range Lake Shore included additional software adjustments for moment offset calibration however there is no significant advantage to this adjustment in a VSM system operating under normal conditions The user initiates the software calibration procedure via the IDEASVSM menu item The IDEASVSM Software Manual details how the software calibration functions and how to perform this procedure 4 3 FIELD CALIBRATION The Lake Shore Cryotronics Inc Cryogenic VSM is configured with a Model 735 VSM Controller and Model 620 622 Magnet Power Supply The Model 735 reads and controls the Model 620 622 which supplies the current for the superconducting magnet see Figure 4 1 In a superconducting magnet the relationship between input current and field produced by the magnet is linear and defined by the magnet constant Field Current in gauss amp The Model 735 Program Output DAC controls the Model 620 622 output current This Model 735 Program Output is set by the system software when a user enters go to field command All of the control parameters are linear thus the Lake Shore Cryogenic VSM is configured for open loop or Current mode with feedback and PI parameters eliminated from the magnetic field control configuration 4 31 Field Setting Control flow for SETTING the magnetic field is User inputs FIELD software gt Model 735 Program Output ramps VOLTAGE gt
71. ing Return requires CMODE One ASCII digit X sets field setting mode 0 Manual setting mode uses COUT 1 Current ramp mode uses RMPTO RMPRT 2 Field controlled ramp mode uses CONTO CONRT CONPI Default 0 Query field setting mode CMODE term X term One ASCII digit X indicates field setting mode 0 Manual setting mode uses COUT 1 Current ramp mode uses RMPTO RMPRT 2 Field controlled ramp mode uses CONTO CONRT CONPI CONLIM Default 0 Set field output change limit for field controlled ramp CONLIM XXXXXXXX term Nothing Return requires CONSCALE The X field is an eight ASCII character representation of a binary floating point number set in percent of full scale field output per minute When CMODE 2 the instrument will not change the field output faster than CONLIM Default 00000000 0 min Query field output change limit for a field controlled ramp CONLIM term XXXXXXXX term The X field is an eight ASCII character representation of a binary floating point number set in percent of full scale field output per minute Default 00000000 0 min Set field controlled ramp P proportional and integral parameters CONPI XXXXXXXX Y Y Y Y Y Y Y Y term Nothing Return requires CONPI The X field is an eight ASCII character representation of a binary floating point P no units The Y field is an eight ASCII character representation of a binary floating point I
72. ing to Lake Shore within five 5 days from receipt of goods If damage or loss is apparent notify shipping agent immediately Carton Shockwatch and Tip n Tell indicators aid in judging the condition of received goods see Figure 2 1 A Shockwatch sticker is also on the pallet under the units Please accept shipment even if Shockwatch is red Note it on the bill of lading and inspect for damage immediately Two Tip n Tell indicators are placed on the Instrument Console pallet Blue beads above the line indicate the container was tipped or mishandled Cut off strapping lift off lid and locate the packing list included with the Figure 2 1 Shockwatch and Tip n Tell Indicators System Use it to check receipt of all components cables accessories and manuals as the system is unpacked Inspect for damage Inventory all components supplied before discarding any shipping materials HANDLE WITH CARE WARNING SHOCKWATCH RED INDICATES ROUGH IF RED NOTE ON BILL OF INSPECTION MAY BE WARRANTED TIP N TELL UP WAS TIPPED OR MISHANDLED Model L 47 Media Recovery Inc ULINE INC Remove the box from the top of the Instrument Console Use four people to lift the Instrument Console from the pallet Do not lift the console at the top always lift from the bottom Note how the console was supported on the pallet for future reference Foam blocks between the instruments support their weight duri
73. ion Control Lake Shore Model 9300 Cryogenic VSM User s Manual 6 3 MODEL 704 MOTION CONTROLLER RS 232 COMMANDS 6 3 1 Communication Via RS 232 and Hyperterminal To open a connection with the Model 704 directly click Start gt Programs gt Accessories gt Hyperterminal on the Windows 95 Taskbar Then double click the Model 704 icon After the terminal window appears press the spacebar twice to receive a sign response Terminal settings are Com Port 1 9600 baud 8 bits 1 stop bit no parity Command List ESC Abort Terminate Ann Motor Selection 0 Motor A16 Motor B A8 Motor C A24 Motor D Read Input Output Status Response the sum of the following DATA CAUSE High input on Port 1 High input on Port 2 High input on Port 3 Output 1 ON Output 2 ON High if moving Trip Point passed Direction Level High if Motor On Off E0 motor phases off E12 motor phases on limit switches enabled Initial Velocity steps second Ramp Slope 0 no ramp larger numbers mean slower ramps Move at constant speed Set Origin Set current position to nn 0 sets current position 0 Store parameters as defaults Trip Point not used nnnn_ Positive Step move nnnn steps in the positive direction Negative Step move nnnn steps in the negative direction Slew Velocity steps second Wait nnnn milliseconds 4 Examine Parameters format K kk V vv T tt Display Position
74. isible damage 2 Fails to perform the intended measurement 3 15 subjected to prolonged storage under unfavorable conditions 4 1 subjected to severe transport stresses Do not use such apparatus until qualified service personnel verifies its safety Electromagnetic interference EMI is both a natural and man made phenomena which either directly or indirectly may degrade electronic system performance Natural EMI includes thunderstorms solar disturbances cosmic rays etc Man made EMI includes fixed and mobile transmitters high voltage power lines power tools and appliances florescent lights and other equipment containing motors heaters etc Protect the AC source from EMI Consider transient surge protectors for lightning protection Pre Installation 2 3 Lake Shore Model 9300 Cryogenic VSM User s Manual 2 1 5 Environmental Requirements To meet and maintain specifications operate the system at an ambient temperature range of 18 to 28 C 64 4 to 82 4 F Operate it within the range of 15 to 35 C 59 to 95 F with less accuracy The system is intended for laboratory use Although no specific humidity or altitude specifications exist relative humidity of 20 to 80 no condensation and altitudes from sea level to 2 4 km 8 000 feet are generally acceptable Adequately ventilate the work area to prevent build up of potentially life threatening concentrations of nitrogen gas see Paragraph 2 2 1 Oxygen content monito
75. libration BUSY CALCLEAR CALSAVE PCAL PCAL SNUM SNUM ZCAL Query Instrument Phase Calibration Set Instrument Serial Number Query Instrument Serial Number Zero Calibrates X amp Y Inputs 521 Command List Structure Command Name Brief Description of Function RANGE Input Returned Remarks Manual Reading Query RANGE Syntax of what user must input 0 1 2 or 3 Information returned in response to the query Used to query the unit for manual range Range is dependent on type of probe installed There are four ranges possible for each probe where 0 is the highest and 3 is the lowest range Explanation and definition of returned data 5 4 Model 735 Controller Remote Operation 5 2 2 Sent Returned Remarks 5 2 3 ADDR Sent Returned Remarks ADDR Sent Returned Remarks END Sent Returned Remarks END Sent Returned Remarks TERM Sent Returned Remarks TERM Sent Returned Remarks Model 735 Controller Remote Operation Lake Shore Model 9300 Cryogenic VSM User s Manual Common Commands Identification query IDN LSCI MODEL 735 XXXXXX MMDDYY term Returns manufacturer model number six digit instrument serial number and firmware date Interface Commands Set instrument IEEE 488 address ADDR XX term Nothing Address return requires ADDR Two ASCII digits XX set the IEEE 488 address between 01 and 31 Default
76. line a few inches above the dewar bottom 3 Remove the system dewar transfer port plug see Figure 3 19 Apply pressure if required to storage dewar while watching exposed end of transfer line When a sputtering sound is heard and a vapor cloud forms at end of transfer line insert it into the transfer port of the system dewar The transfer line must be long enough to reach the belly of dewar 30 inches 76 cm but should not extend below the existing helium level CAUTION To prevent pressure build up open Vent Valve when inserting transfer line into dewar Warm transfer line insertion causes existing liquid helium to boil off 4 Transfer and fill dewar to desired level by pressurizing storage dewar A cold transfer takes 15 to 30 minutes to fill the dewar The Model 241 Level Monitor uses a super conductive probe dewar temperature gt 10 K interrupts level readings 5 Remove both ends of transfer line Wear cryo gloves when performing this operation CAUTION After a lengthy transfer ice build up may prevent removal of the transfer line or immediate replacement of the transfer port plug Use a gentle hot air gun to warm the transfer port and melt the ice Do not over heat 6 Firmly plug transfer port and close Vent Valve to ensure proper gas flow through leads and prevent air condensation inside system dewar 3 10 Installation Lake Shore Model 9300 Cryogenic VSM User s Manual CHAPTER 4 CALIBRATION 4 1 INTRODUCTION W
77. m mount cup onto the extension piece and mount it between the pick up coils Visually center the cup in the x and y direction Set a large field 6000 Oe in the magnet with the Set Field function in the software Open the IDEAS735 Momentmeter Turn the head drive ON and monitor the emu signal Adjust the z axis until the moment signal reads zero Remove the sample cup and mount the sample Re install the cup and re adjust the z axis upwards a distance of half of the sample thickness Remove the magnetic field Follow the normal steps for taking a measurement with the software Q0 I 9 70r o For further assistance please contact the Systems Service department at Lake Shore Cryotronics Inc Phone 614 891 2243 Fax 614 891 1392 Appendix B Sample Holders B 1 CAPSULE SAMPLE HOLDERS Lake Shore Model 9300 Cryogenic VSM User s Manual Two different capsule sample holders come with the Model 9300 They are 1 Holder for Capsule 2 Holder for 4 Capsule FOR 3 CAPSULE 0 213 40 002 0 18 DEEP FOR 4 CAPSULE 0 201 0 002 0 18 DEEP lt 1 12 0 66 NOTES 1 MATERIAL KEL F ROD 0 25 DIA 2 8 32 THREAD TO BE CONCENTRIC THREADS TO ROD DIA WITHIN 005 TIR 3 FINISH NONE 4 THIS PART TO MATE WITH ROD ADAPTER 4589 A MD Figure B 2 Capsule Sample Holders Appendix B Sample Holders Lake Shore Model 9300 Cryogenic VSM User s Manual APPENDIX C WIRING TABLES Table C 1 Standard VSM Insert
78. ment is necessary along with a correct path to the file QBDECL BAS CONFIG SYS must call GPIB COM created by IBCONF EXE prior to running Basic There must be QBIB QBL library in the QuickBasic Directory and QuickBasic must start with a link to it 11 instrument settings are assumed to be defaults Address 12 Terminators CR LF and EOI active To use type an instrument command or query at the prompt The command transmits to the instrument and the MPS receives and displays the response If no query is sent the instrument responds to the last query received Type EXIT to exit the program NOTE The NPUT instruction accepts no commas as part of an input string If a comma appears in an instrument command replace it with a space REM SINCLUDE c gpib pc qgbasic gbdecl bas Link to IEEE calls CLS Clear screen PRINT IEEE 488 COMMUNICATION PROGRAM PRINT CALL IBFIND dev12 DEV12 Open communication at address 12 TERMS CHR 13 10 Terminators are lt CR gt lt LF gt INS SPACES 2000 Clear for return string INPUT ENTER COMMAND or EXIT CMDS Get command from keyboard CMDS UCASES CMDS Change input to upper case CMDS EXIT THEN END Get out on Exit CMDS CMDS TERMS CALL IBWRT DEV12 CMDS Send command to instrument CALL IBRD DEV12 INS Get data back each time ENDTEST INSTR INS CHRS 13 Test for returned string F ENDTEST 0 THEN String is present if CR is seen
79. mmon descending domain to open the flow control valve wide during the ramp and then open it only slightly after the ramp It is also common to open the solenoid valve during a descending ramp and close it afterward This allows rapid cool down followed by temperature control with minimal power and helium consumption Model 704 Remote Motion Control 6 5 Lake Shore Model 9300 Cryogenic VSM User s Manual 6 4 2 Sample Space Evacuation Valve The sample space needs to be evacuated to facilitate rapid cool down and to reach temperatures below 4 2 K The space is evacuated by opening a relay controlled solenoid valve using either the IDEAS340 or Virtual 340 software IDEAS 340 To toggle the position of the solenoid valve from the IDEAS340 software click the valve button on the toolbar Also access the two Model 340 relays through the Utilities gt Relay Settings menu item The Low Relay controls the solenoid the High Relay is unassigned VIRTUAL 340 Control the solenoid valve from the Virtual 340 front panel by clicking the Sample Space Valve radio buttons Open Closed and Auto The Auto setting allows the valve to be controlled automatically through the temperature domains As with the flow control valve the sample space valve has two settings for each domain one for during and after a ramp 6 6 Model 704 Remote Motion Control Lake Shore Model 9300 Cryogenic VSM User s Manual CHAPTER 7 OPTIONS 7 1 VECTOR OPTION In refe
80. mper which goes completely around the disk at the top of the assembly 4 Remove the two rubber shock mounts at the top of the disk 5 Before reinstalling cover lightly grasp the copper weights to verify they have not worked loose in shipment Do not use excessive torque If they are loose very unlikely contact the factory 6 Inspect wiring for breakage also unlikely 7 Replace the cover and rethread the rim Screws 8 When ready to install the drive assembly remove it from the wooden block by removing the lag bolts in each corner 2 1 3 Site Requirements The Customer is responsible for site preparation Plan the site before the 9300 System arrives Research physical location environment cryogenic storage and access power ventilation safety and local building electrical and safety codes before system installation See Figure 2 2 for physical dimensions of a suggested site After initial screening evaluate sites according to space location power and structural integrity Figure 2 2 Drive with Cover Removed 1 Space Adequate for system installation operation potential expansion service and storage of supplies Space and layout requirements depend on the system selected The ceiling must be high enough to allow the sample rod assembly insertion and removal Minimum clearance measured from the center of the magnet pole pieces to the ceiling is 85 inches 215 9 cm 2 Location Convenient for equipment a
81. n Option varies sample orientation relative to the direction of applied magnetic field The angle of rotation is within a single plane defined by the direction of applied magnetic field called the x axis and perpendicular to the direction of vibration called the z axis see Figure 7 1 A stepping motor on the VSM drive head controls the motion Two limit switches determine HOME and END positions of rotation All stepping motor controller communication is through the RS 232 serial interface to the PC Find more information about the stepping motor its drive and the interface software in the VSM Software User s Manual 7 2 1 Installation see Figure 7 1 1 Remove mechanical drive from its box and set it on the bench with its electrical connectors to your left CAUTION The gear that runs around the bottom of the VSM head has a small 1 16 inch diameter pin protruding from the bottom of it This pin signals the limit switch that it has reached its limit of travel Handle the VSM head carefully to avoid damaging this pin 2 If the large gear is not already installed on the mechanical drive cover remove the cover and replace the decorative black ring with the gear Position the gear so its mounting holes line up with the holes in the cover and the pin points downward The gear should fit tight against the cover Draw the gear onto the cover with the long mounting screws After the gear seats replace the mounting screws with the proper cap screws Th
82. n the amplitude and frequency of vibration This technique depends on being able to use a vibrating capacitor located beneath the transducer to generate an AC control signal that varies solely with the vibration amplitude and frequency The signal which is at the vibration frequency is fed back to the Oscillator where it is compared with the drive signal so as to maintain constant drive output It is also phase adjusted and routed to the signal demodulator where it functions as the reference drive signal The signal from the sample is developed in the pickup coils then buffered amplified and applied to the demodulator There it is synchronously demodulated with respect to the reference signal derived from the moving capacitor assembly The resulting DC output is an analog of the moment magnitude alone uninfluenced by vibration amplitude changes and frequency drift 4 2 MOMENT CALIBRATION The moment calibration of Vibrating Sample Magnetometers is traditionally performed with a nickel standard at an applied field above the saturation field of nickel nominally 5000 Oe Lake Shore supplies a nickel cylinder of 99 99 purity an aspect ratio of nearly 1 1 and a mass of approximately 0 02 grams These samples are etched and weighed prior to measuring their saturation magnetization The saturation magnetization of the nickel samples are measured with a VSM calibrated with a NIST NBS nickel standard Typical magnetization data is recorded between 500
83. nd supply delivery and handy to related work areas for efficient operation Especially important is sufficient access for a lift to move and place an electromagnet Place the magnet in an area free from major vibration from motors pumps forklifts etc it may interfere with VSM System Operation Place the magnet dewar as far away as possible from equipment containing large AC magnetic fields including the magnet power supply they can induce signals large enough to overload the magnetometer input amplifiers If necessary shim the magnet dewar to level it Perform a complete check of the magnet and magnet power supply before proceeding with installation 3 Power Adequate for system requirements potential expansion and wiring for maximum efficiency and economy of operation 4 Structural Integrity Level floor strong enough to support anticipated loads and free from extraneous vibrations or magnetic fields Vibrations transmitted to consoles may degrade system performance 2 2 Pre Installation Lake Shore Model 9300 Cryogenic VSM User s Manual Computer Table Computer 0 75x 1 5m Instrument not supplied Console Figure 2 3 9300 VSM System Sample Floor Plan and Clearances 2 1 44 System Power And Ground Requirements The AC power source for the Model 9300 System must be frequency and voltage regulated and isolated from sources that may generate Electromagnetic Interference EMI The equipment in the 9300 requires single ph
84. ng shipment remove them or simply leave them in place To transport the unit first insert the foam blocks The second pallet contains the system dewar Three other boxes contain the system computer cryostat with VSM insert and sample rod and the drive Verify receipt of all manuals If any manuals are missing contact Lake Shore immediately Be sure to fill out and send instrument warranty cards If there is instrument freight damage file claims promptly with the carrier and insurance company and advise Lake Shore Cryotronics of such filings Advise Lake Shore immediately of missing parts Lake Shore cannot be responsible for any missing parts unless notified within 60 days of shipment The standard Lake Shore Cryotronics Inc Warranty appears on the A Page immediately behind the title page of this manual Pre Installation 2 1 Lake Shore Model 9300 Cryogenic VSM User s Manual 2 1 2 Removing Packing Material from the Magnetometer Drive SHOCK MOUNTS Inside the magnetometer drive there are several pieces of protective material to remove before operation The drive normally ships on a wood SHOCK 1 Remove the three stainless steel rim screws BUMPER NOT the black anodized screws and lift off the cover 2 The mechanism under the cover is protected by a plastic bag and sometimes a piece of COPPER WEIGHT foam rubber outside the bag Remove the foam rubber if present and the bag 3 Remove the shock bu
85. o it Liquid nitrogen is considerably less expensive than liquid helium Level 6 Open the cryostat Vent Valve Figure 3 4 With two people lift the cryostat by grasping the Flush Pipe and the Vent Pipe and carefully slide it into the dewar If pre cooling the liquid nitrogen will Locking boil vigorously upon cryostat insertion Morning TRANSVERSE FIELD MAGNETS ONLY Unlike Bemor parallel field magnets the magnet resides in the Leveling dewar instead of at the end of the cryostat Two metal rods emerge from inside the dewar these are the magnet terminals Each of the baffles on the cryostat has two holes into which the terminal rods insert As the cryostat slowly slides into the dewar guide the terminal rods through the holes in each of the baffles Finally guide the terminal rods through the top of the cryostat so that approximately 72 inch protrudes from the top of Figure 3 3 Dewar Adjustment Rods O Ring and the terminal posts Tighten the terminal post Leveling the Mounting Structure compression fittings to secure the terminal rods in place Solenoid Valve 16mm Flush Vent Vent Assembly Clamp Pipe Pipe Valve Line Figure 3 4 Attaching Solenoid Valve Assembly to Cryostat 3 2 Installation 10 11 12 13 14 Lake Shore Model 9300 Cryogenic VSM User s Manual Tighten the eight cryostat flange bolts with the 9 64 inch Allen Wrench Complete steps 7 11 then tighten them again Figu
86. ommended to use the default interface settings below whenever possible 735 Default Interface Settings Address 9 Terminators CrLf EOI On Mode Remote To operate two Model 735 Controllers on the bus at one time change the address of one with the ADDR command Record the new address the instrument will not respond at the default address after a change The new address will be kept when instrument power is turned off Local operation of the instrument is not possible so the mode is defined as remote 5 1 4 Interface LED There is and Interface LED on the Model 735 front panel Its normal state is off but it turns on momentarily each time an interface command is sent to the instrument If the instrument performs a long task such as calibration the LED remains on until the task is complete The interface should not be used during this time except for the BUSY Query that informs the user when the task is complete Model 735 Controller Remote Operation 5 1 Lake Shore Model 9300 Cryogenic VSM User s Manual 5 1 5 Example IEEE Setup and Program NOTE The following is intended for servicing the Model 735 stand alone The setup and configuration are not appropriate for use in a larger system Below is an example of how to setup and run a simple program using the Model 735 IEEE 488 Interface The example uses a National Instruments GPIB PCII IIA card and QuickBasic 4 0 or 4 5 on a PC compatible 5 1 5 1 GPIB Board Installation 1 Install
87. physician is unavailable warm the affected parts with water that is near body temperature Two essential safety aspects of handling LHe are adequate ventilation and eye and skin protection Although helium and nitrogen gases are non toxic they are dangerous because they replace air in a normal breathing atmosphere Liquid helium is an even greater threat because Figure 2 4 Cryogenic a small amount of liquid evaporates to create a large amount of gas Storage Dewar Store and operate cryogenic dewars in open well ventilated areas When transferring LHe and LN protect eyes and skin from accidental contact with liquid or the cold gas issuing from it Protect eyes with full face shield or chemical splash goggles safety glasses even with side shields are inadequate Always wear special cryogenic gloves Tempshield Cryo Gloves or equivalent when handling anything that is or may have been in contact with the liquid or cold gas or with cold pipes or equipment Wear long sleeve shirts and cuffless trousers long enough to prevent liquid from entering shoes 2 211 Recommended First Aid for LHe or LN Exposure Post an appropriate Material Safety Data Sheet MSDS obtained from the manufacturer distributor at every site that stores and uses LHe and LN The MSDS specifies symptoms of overexposure and first aid If a person exhibits symptoms of asphyxia such as headache drowsiness dizziness excitation excessive salivation vomiting or uncon
88. plete BUSY term X term Returns one ASCII digit X If X 1 the instrument is calibrating If X 0 the instrument is performing normal operation Clears instrument calibration memory CALCLEAR term Nothing The instrument writes default calibration data to EEPROM where it is read on power up All software calibrations are lost including serial number It takes at least two seconds to complete and BUSY 1 during the task Saves a calibration CALSAVE term Nothing The instrument writes calibration data to EEPROM where it is read on power up A software calibration done without CALSAVE is lost when the instrument is turned off It takes at least two seconds to complete and BUSY 1 during the task Sets instrument phase calibration PCAL XXXX term Nothing Return requires PCAL Four ASCII digits of serial number specify phase calibration Default 0000 Instrument phase calibration setting query PCAL term XXXX term Returns four ASCII digits which indicate phase calibration setting Default 0000 Lake Shore Model 9300 Cryogenic VSM User s Manual SNUM Sets instrument serial number Sent SNUM XXXXXX term Returned Nothing Setting return requires SNUM Remarks Six ASCII digits specifies serial number Default SNUM Query instrument serial number Sent SNUM term Returned XXXXXX term Remarks Returns six ASCII digits which indicate instrument serial number Default 9
89. position 327 indicates where limit switch tripped W2000 wait 2 seconds EO turn motor phases off switch to channel E12 turn motor phases on 01000 set current position to 1000 position of channel A V1000 set velocity to 1000 velocity for channel A K8 set ramp to 8 7 ramp for channel A 500 move 500 steps in the positive direction A129 check limits 3 indicates Channel A selection and both limit inputs are high or inactive 0 2 1 3 Z request position 1500 response 6 4 Model 704 Remote Motion Control Lake Shore Model 9300 Cryogenic VSM User s Manual Notes 1 Always turn off motor phases before switching channels to avoid damaging motor windings and switching relays 2 Keep track of the position of each channel and reset the position along with velocity acceleration initial velocity etc each time you change channels 3 Activate limit switches for channel X by bringing inputs X1 or X2 to ground g1 Limits are active only for the currently selected channel A 5V output is provided so that optical or other logic based limit detectors can be used as well as a simple switch Input X1 is the negative limit for channel X while input X2 is the positive If a limit input is brought low the motor stops moving and holds at the current position Check status of limit switches with the A129 command If the limit inputs are both high then the least significant bits of the response to A129 will be ones i e
90. put set it to output 1 Set all five auxiliary digital outputs AUXDO XX term Nothing Output return requires AUXDO Two ASCII digits XX represent the five digital outputs Each output is represented by an individual bit 0 logic low 1 logic high The hex sum of the bit weights create a setting value from 00 to 1F hex Bit weighting is as follows Bit Weight Use 0 01 Digital output 1 1 02 Digital output 2 2 04 Digital output 3 3 08 Digital output 4 4 10 Digital output 5 Hex addition of the bit weights gives all input states Default 00 NOTE Digital outputs and inputs share pins on the auxiliary connector To use a digital line as an input set it to output 1 Model 735 Controller Remote Operation AUXDO Sent Returned Remarks RELAY Sent Returned Remarks RELAY Sent Returned Remarks Model 735 Controller Remote Operation Lake Shore Model 9300 Cryogenic VSM User s Manual Query auxiliary digital output setting AUXDO term XX term Two ASCII digits XX represent the five digital outputs Each output is represented by an individual bit 0 logic low 1 logic high The hex sum of the bit weights create a setting value from 00 to 1F hex Bit weighting is as follows Bit Weight Use 0 01 Digital output 1 1 02 Digital output 2 2 04 Digital output 3 3 08 Digital output 4 4 10 Digital output 5 Hex addition of the bit weights gives all output states Default 00 Set state
91. quadrature on or off QUAD X term Nothing Return requires QUAD One ASCII digit X sets channel Y quadrature on or off 0 OFF Channel Y in phase with channel X 1 ON Channel Y in quadrature with channel X Default 0 Query channel Y quadrature setting QUAD term X term Returns one ASCII digit X indicating channel Y quadrature 0 OFF Channel Y in phase with channel X 1 ON Channel Y in quadrature with channel X Default 0 Model 735 Controller Remote Operation 5 7 READ Sent Returned Remarks READC Sent Returned Remarks READP Sent Returned Remarks READP Sent Returned Remarks READS Sent Returned Remarks 5 8 Lake Shore Model 9300 Cryogenic VSM User s Manual Query newest reading data READ term XXXXXXXX YYYYYYYY FFFFFFFF TTTTTTTT term Returns three eight character ASCII representations of a binary floating point number indicated by the X Y and F fields X field voltage present at Channel X input Y field voltage present at Channel Y input F field voltage present at Field input The T field is an eight digit decimal integer representing time in 10 ms increments from initial instrument power up until the reading was taken New data taken every 100mS Clears data from the reading buffer READC term Nothing Data in the reading buffer is lost Stores data taken after the READC command return data using the ALLR query Set sample perio
92. quipment Use a Carbon Dioxide or Halon fire extinguisher During the planning stage consult local experts building authorities and insurance underwriters on locating and installing sprinkler heads fire and smoke sensing devices and other fire extinguishing equipment Locate an oxygen concentration monitor and alarm in the system work area near the system Locate another in the dewar storage area LHe and LN can rapidly replace the breathing atmosphere an enclosed area with no warning Oxygen concentration monitor and alarms are the best way to reduce this potential hazard A superconducting magnet can generate large magnetic fields Post signs at each entrance to the work area that state Warning High Field Magnets Fringe fields may be hazardous to pacemakers and other medical devices Keep magnetic materials clear of area Paint a yellow magnetic field warning line on the floor 1 meter 3 feet from the sides of the electromagnets Locate a fireproof safe at or near the work site for temporary storage of data and copies of original system software and documentation Store duplicate copies of vital data well away from the system area also in fireproof storage vault or safe Even where not required by code install some type of automatic battery operated emergency lighting in case of power failure or fire 2 4 Pre Installation Lake Shore Model 9300 Cryogenic VSM User s Manual 2 2 1 Handling Liquid Helium and Liqu
93. r alarms should be installed near the work site to warn against low oxygen levels if liquid cryogens are used The air conditioning system should filter dust and other particulates to reasonable levels Consult an air conditioning expert about special filtering if salt air corrosive gases or other air pollutants exist 2 2 SAFETY Train personnel in proper emergency measures such as electrical power shut off fire department notification fire extinguishing and personnel and records evacuation Here is a list of suggested personnel safety considerations Ground Fault Interrupter GFI AC circuits Paragraph 2 2 1 Cryogenic Safety Gloves Apron Goggles Faceshield and Apparel Paragraph 2 2 1 Fire Extinguisher Oxygen Concentration Monitor Alarm Paragraph 2 2 1 Magnetic Field Warning Signs Fireproof Safe for Data Original Software and Documentation Storage Emergency Lighting Locate in the immediate vicinity fire extinguisher s that extinguish all three classes of fires A B and C Class A is ordinary combustibles like wood paper rubber many plastics and other common materials that burn easily Class B is flammable liquids like gasoline oil and grease Class C is energized electrical equipment including wiring fuse boxes circuit breakers machinery and appliances Do not use chemical extinguishers even though they are less expensive and cover all classes of fires They may damage electronic e
94. r during transfer fc TE Figure 3 18 Connecting the Model 241 2 Insert one end of transfer line into liquid helium storage dewar See Figure 3 17 Position end of transfer line a few inches above the dewar bottom CAUTION To prevent rapid pressure build up open Vent Valve and insert transfer line slowly into dewar Venting excessive gas is usually necessary during initial transfer line insertion 3 Remove cryostat transfer port plug and insert other end of transfer line into cryostat transfer port Figure 3 19 Position end of transfer line a few inches above the magnet dewar bottom Total length is 54 inches 4 Transfer slowly Simply sealing closing storage dewar and allowing transfer to proceed under ambient pressure is often sufficient for initial phase Transfer Port with Plug 5 After the transfer starts allow about 15 minutes for helium gas to totally flush the dewar Then open the Solenoid Assembly Valve and crack open the needle valve a bit Figure 3 19 Helium Transfer Port with Plug 6 Ittakes about 2 to 3 hours to bring system temperature from room temperature to under 40 K Allow 4 to 6 hours for 9 tesla systems Since the Model 241 Level Monitor uses a superconductive probe it makes no level readings until dewar temperature is 10 K When temperature nears 4 2 K or as needed apply pressure to storage dewar to force liquid helium over Typically 1 to 5 psi 7 to 35 kPa pressure is enough to transfer
95. racteristic of ferromagnets include magnetization and induction permeability coercivity and Curie point The latter three are not directly related to the EMU but may be determined with a VSM The VSM measures the total magnetic moment m of a sample in emu Using the definition of the emu this result relates to sample magnetization 1 emu 1 Gauss cm 1 To determine magnetization M divide the sample moment m by the sample volume V M Gauss m emu Gauss cm V cm3 2 Also express magnetization in terms of the magnetic moment per gram denoted To calculate c divide the sample moment m by the sample mass o emu g m emu mass g 3 M and c are related by the sample density p M Gauss o emu g p g cm3 4 The magnetic moment per gram is normally handier to use than the magnetization since it is easier to weigh a sample than to measure its volume When converting to magnetization via Equation 4 remember that density is generally temperature dependent The magnetic induction B is defined in terms of the applied field H and the magnetization M B Gauss H Oersted 4 M Gauss 5 where 1 Gauss 1 Oersted in vacuum The quantity B H is known as the intrinsic induction and this quantity reaches a maximum value called the saturation induction Bs as the field H increases lim B H Bg Gauss 6 H gt Likewise magnetization M reaches a limiting value the saturation magnetization Ms
96. ragraph 5 1 and Command Set Paragraph 5 2 5 1 IEEE 488 INTERFACE The IEEE 488 Interface is an instrumentation bus with hardware and programming standards that simplify instrument interfacing The Model 735 IEEE 488 Interface complies with most of the IEEE 488 2 1987 standard and incorporates its functional electrical and mechanical specifications unless otherwise specified 5 1 1 Interface Capabilities e SH1 Source handshake capability SRO Service request capability Complete remote local capability AH1 Acceptor handshake capability e DC1 Full device clear capability PPO No parallel poll capability No device trigger capability E1 Open collector electronics e CO No system controller capability 5 Basic TALKER serial poll capability talk only unaddressed to talk if addressed to listen L4 Basic LISTENER unaddressed to listen if addressed to talk 5 1 2 Common Commands Common Commands are addressed commands which create commonalty between instruments on the bus All instruments that comply with the IEEE 488 1987 standard share these commands and their format Common commands all begin with an asterisk Common query commands end with a question mark The only common command supported by the Model 735 is IDN 5 1 3 Interface Settings The IEEE 488 interface on the model 735 is somewhat limited in flexibility because it is intended for use as part of a larger system It is rec
97. re 3 5 NOTE The weight of the cryostat makes it unnecessary to thread all eight flange bolts for a good seal If desired a single bolt in the front and back suffices to seal the dewar 8 Flange 4 Vent Valve B E Clamp pump hose to Solenoid Valve Assembly with 25 mm clamp Figure 3 5 Plug in pump and turn it On Plug Relay Cable Figure 3 4 into the Model 340 Relay port Figure 3 6 Plug the Solenoid Transformer into Solenoid Valve Assembly Under the transformer is a voltage switch Set it to the voltage appropriate to your supply 115 V or 230 V Figure 3 7 Plug the solenoid power cord into the Solenoid Transformer Plug the other end into the console power strip or other power supply Figure 3 7 Figure 3 6 Connecting Relay Cable to Model 340 Plug in the pump and turn it on Open the IDEAS 340 software driver and Solenoid Insert click the Relay Switch button Figure 3 Transformer Pipe 8 The Solenoid Valve Assembly clicks Cap and the pump evacuates air from the Sh sample space Pump out the sample Voltage Switch space for about 10 minutes CAUTION Evacuate the sample space eer as soon as possible to avoid water Solenoid freezing in the sample space Power Cord If pre cooling with liquid nitrogen wait until after the boil off dies down then shut Vent Valve unseat Ne
98. read the screws gradually and evenly Re install the cover The pin should be on the right side with the drive positioned at zero degrees 3 Install the limit switch to the right side of the cover base with two 4 40 screws Install the switch with the cable exiting at the bottom 4 Install the stepper motor bracket to the bottom of the mechanical drive with the two hex bolts Visually line up the two gears Adjust the gear on the motor shaft so the teeth are at the same level as the larger gear Tighten the set screws at the gear 5 Install the timing belt over the pulleys Rotate the cover 90 degrees to seat the belt in the gear teeth Move motor bracket outward with one hand while tightening mounting screws Use hand force only Install metal belt shroud The cables to the both the limit switch and the stepper motor merge into a single connector Plug it into the Model 704 Motor D output Options 7 1 Lake Shore Model 9300 Cryogenic VSM User s Manual If the Rotation Option shipped with the VSM System the correct software is already installed in the computer and automatically detects the presence of the stepping motor drive when the program starts If the Rotation Option shipped after receipt of the VSM System install the proper PC operation software before using the option Follow the instructions included with the software to install the program AL J a Gear Pin On right side y VSM Reference Frame with drive positioned at
99. rence to the Vector Option pick up coil set the x axis measures the magnetic moment parallel to the applied magnet field and the y axis measures the magnetic moment perpendicular to to the applied magnet field The 735 VSM Controller can obtain both x and y axis magnetic moment measurements simultaneously For cryogenic systems the Vector option is available only for transverse field magnets 7 1 1 Calibration Y axis coils calibration uses X axis coils calibration as a reference Calibrate Y axis coils with a permanent magnet at an applied field of zero gauss First measure the magnetic moment of a permanent magnet with the X axis coils Rotate the permanent magnet 90 to produce a positive moment in the Y axis coils see VSM Reference Frame Figure 7 1 Adjust the Y axis coil moment reading to equal the X axis coil moment reading NOTE The magnetization axis of the permanent magnet rotates 90 according to the rotation index on the VSM drive head Proper calibration requires the sample saddled after rotation For the Y axis coils the minimum and maximum emu outputs required to saddle the sample interchange The x direction saddle is now a maximum emu output and the y direction saddle is a minimum emu output After obtaining the new saddle point allow the software to measure the Y axis emu value and determine a calibration constant This calibration constant is stored until a new calibration is performed 7 2 ROTATION OPTION The Rotatio
100. ressly excluded CERTIFICATION Lake Shore certifies that this product has been inspected and tested in accordance with its published specifications and that this product met its published specifications at the time of shipment The accuracy and calibration of this product at the time of shipment are traceable to the United States National Institute of Standards and Technology NIST formerly known as the National Bureau of Standards NBS TRADEMARK ACKNOWLEDGMENT Many manufacturers and sellers claim designations used to distinguish their products as trademarks Where those designations appear in this manual and Lake Shore was aware of a trademark claim they appear with initial capital letters and the or symbol Apiezon is a trademark of Biddle Instruments ASYST is a trademark of MacMillian Software CalCurve Carbon Glass Cernox Duo Twist Quad Lead Quad Twist SoftCal and i QMSA are trademarks of Lake Shore Cryotronics Inc Cryo Gloves is a trademark of TempShield Duco is a trademark of E l DuPont de Nemours Formvar is a trademark of Monsanto Chemical Company Hercules is a trademark of Hercules Inc IDEAS is a trademark of Unisys Corporation and is licensed for use with Lake Shore Software Drivers MS DOS is a trademark of MicroSoft Corporation NI 488 2 is a trademark of National Instruments PC XT AT and PS 2 are trademarks of IBM Scotch is a trademark of 3M Stycas
101. rocessed magnetic moment measurement data in either graphical or tabular format Standard measurements such as hysteresis loops moment time and moment temperature are built into the control software See the VSM Software manual for minimum hardware and software requirements Standard Model 9300 Superconducting Magnet VSM system Model 735 VSM Control Electronics Superconducting Magnet Dewar Model 340 Temperature Controller VSM Drive Assembly and Mounting Structure Model 704 Motion Controller Cryostat VSM Insert with Sample Rod Model 620 622 Magnet Power Supply e Edwards 2 Stage HP Pump Model 241 Liquid Helium Level Monitor Cryostat with 1 5 9 12 T parallel field or 7 T transverse field superconducting magnet Introduction 1 1 Lake Shore Model 9300 Cryogenic VSM User s Manual 1 2 5 System Options See Chapter 6 High temperature ovens allow measurements from 25 C to 700 C The Vector Torque Magnetometer option simultaneously measures 2 axis magnetic moment vectors to investigate anisotropic and low dimensional magnetic materials The Auto Rotation option automatically rotates a sample over a full 360 with angular resolution of better than 1 Use it with the Vector Torque option to produce torque curves as a function of rotation angle The Auto Positioning option automatically positions the sample within the VSM sensing coils to significantly simplify operation and enhance measurement acc
102. rom the date of shipment During the warranty period under authorized return of instruments or component parts to Lake Shore freight prepaid the company will repair or at its option replace any part found to be defective in material or workmanship without charge to the owner for parts service labor or associated customary return shipping cost Replacement or repaired parts will be warranted for only the unexpired portion of the original warranty or 90 days whichever is greater All products are thoroughly tested and calibrated to published specifications prior to shipment Calibration Certifications are offered for six month periods only Where such documentation must be updated a re certification service is offered by Lake Shore at a reasonable cost LIMITATION OF WARRANTY This warranty does not apply to defects resulting from improper installation product modifications made by others without Lake Shore s express written consent or from misuse of any product or part This warranty also does not apply to fuses software non rechargeable batteries or problems arising from normal wear or failure to follow instructions This warranty is in lieu of any other warranties expressed or implied including merchantability or fitness for a particular purpose which are expressly excluded The owner agrees that Lake Shore s liability with respect to this product shall be set forth in this warranty and incidental or consequential damages are exp
103. s See Figure 6 1 However only one motor can be energized at any one time Pins 5 and 9 and 3 and 8 provide power to the motor winding pairs Maximum power output to the windings are 2 5 A at 26 V CONTROL I O QO AN AN 100 120 220 240 V 0 6 Voltage 100 120 1 0 A T 250V 0 25 1 25 SERIAL 110 50 60 Hz 75 VA 220 240V 0 5 A T 250V 5X20mm 00000 00000 00000 WARNING eA ooo eA 0 SN 9 o o 0 NO USER SERVICEABLE PARTS INSIDE REFER F 9300 6 1 eps Figure 6 1 Model 704 Rear Panel Model 704 Remote Motion Control 6 1 Lake Shore Model 9300 Cryogenic VSM User s Manual Table 6 1 Model 704 Wiring Information Xor Y Z or Rotation W 017 Connector W 012 L puc 5 den 4 ANN black 9 pin D Sub 9 Pin D Sub Backshell Cable Plug Socket 653 157 653 158 663 122 663 119 9 Places 15 feet 012 Cable Clamp 9 Pin Circ Wire 663 124 1 5 5 1 Blue 9 2 Black 222225 JE AE 6 9 8 4 Green Front View 3 7 Black 9 Pin Connector 7 9 Red 2 8 Black 6 6 White 1 3 Black C 9300 6 2 eps Figure 6 2 Model 704 Cable Assembly 6 2 Model 704 Remote Mot
104. sciousness remove to fresh air If breathing is difficult give oxygen If breathing stops give artificial respiration Call a physician immediately If exposure to cryogenic liquids or cold gases occurs restore tissue to normal body temperature 98 6 F by bathing it in warm water not exceeding 105 F 40 C DO NOT rub the frozen part either before or after rewarming Protect the injured tissue from further damage and infection and call a physician immediately Flush exposed eyes thoroughly with warm water for at least 15 minutes In case of massive exposure remove clothing while showering with warm water The patient should not drink alcohol or smoke Keep warm and rest Call a physician immediately Pre Installation 2 5 Lake Shore Model 9300 Cryogenic VSM User s Manual 2 2 2 Electrostatic Discharge Electrostatic Discharge ESD may damage electronic parts assemblies and equipment ESD is a transfer of electrostatic charge between bodies at different electrostatic potentials caused by direct contact or induced by an electrostatic field The low energy source that most commonly destroys Electrostatic Discharge Sensitive ESDS devices is the human body which generates and retains static electricity Simply walking across a carpet in low humidity may generate up to 35 000 volts of static electricity Current technology trends toward greater complexity increased packaging density and thinner dielectrics between active elements wh
105. systems with a gaussmeter probe type TYPE_450 0 HST and the Model 735 set to use Range 0 or Domain 1 Offset in the Read Circuit is measured once the magnet has been cooled and the power supply and VSM controller are operating 45 SOFTWARE CONFIGURATION IDEASVSM configured for a Model 735 VSM Controller uses four configuration files located in the c windows directory These four files are ideacfg ini m735init ini m735zone ini and probedat ini Data in m735init ini configures Model 735 Program Output Data in m735init ini and probedat ini configures Model 735 Field Input Data m735init ini and m735zone ini controls superconducting magnet ramping Table 4 3 IDEASVSM Software configuration file entry points for Field Control Superconducting Magnet Maximum Field G Model 735 Program Output Full Scale always 10 V Model 735 Field Input Gain Constant none probedat ini in Probe Description Field Sensitivity 1 0 and in Calibration Data 0 offset gain Field Compensation always off m73b5init ini Field Compensation 0 Magnet Ramping Maximum Field Field Input Scale Factor G V probedat ini in Probe Description TYPE_450 0 always Magnet Control Mode m735init ini Control mode Setup IDEAS735 Domains using Rates button Lake Shore has not tested in Field Control Mode 3 98 4 4 Calibration Lake Shore Model 9300 Cryogenic VSM User s Manual 4 6 EXAMPLE The field control of a Lake Shore
106. t is a trademark of Emerson amp Cuming TACKIWAX is a trademark of CSC Scientific Co Inc Teflon is a trademark of DuPont De Nemours Copyright 1998 and 1999 by Lake Shore Cryotronics Inc All rights reserved No portion of this manual may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the express written permission of Lake Shore A Lake Shore Model 9300 Cryogenic VSM User s Manual NICKEL SAMPLE Serial Number This nickel sample was fabricated from 99 995 purity nickel The moment was verified with two independent measurement techniques Corrections for demagnetization effects were not made The estimated accuracy of each determination is 2 We recommend averaging the two measurements Method 1 involved a mass determination and the use of the magnetization values for nickel as stated in the ASTM Standard A 894 89 The density of nickel was taken as 8 908 gm cm The table to the right summarizes the magnetization values at 293 K Method 2 was a direct experimental comparison with a Magnetic Field M Mm kOe 2 0 2 emu gm 487 488 489 490 491 NIST SRM 772 Nickel Sphere using a vibrating sample magnetometer Method 1 Mass gm Magnetic Moment emu calculated at Method 2 Test Magnetic Field kOe Magnetic Moment emu Magnet Specifications Magnet Rated Current M
107. trumentation includes a 3 conductor power cord Line voltage travels across the outer two conductors The center conductor is a safety ground and connects to the instrument metal chassis when the power cord attaches to the power connector For safety plug the cord into an appropriate grounded receptacle 2 3 5 Power Switch The power switch turns instruments ON and OFF and is located in the line input assembly on the instrument rear When 1 is raised on the switch the instrument is ON when 0 is raised the instrument is OFF A graphic above the switch illustrates the on and off positions Do not remove instrument covers without first disconnecting the power cord even if the instrument power switch is off 2 8 Pre Installation Lake Shore Model 9300 Cryogenic VSM User s Manual CHAPTER 3 INSTALLATION 3 1 MODEL 9300 SYSTEM INSTALLATION Required Tools 1 9 64 Allen Wrench 2 Level 3 Open End Wrench 11 inch Read chapter 2 carefully before installing the system Remove the system from the shipping crates Place the magnet dewar system console and computer in their planned locations see Figure 2 2 Place the magnet dewar at least 6 feet from the computer The high magnetic fields generated by the superconducting magnet may effect computer performance if it is closer than 6 feet Level the dewar 3 1 1 INITIAL COMPUTER CONSOLE CONNECTIONS The computer connects the same way N regardless of the system configuration see F
108. umber from 0 to 1F An individual bit represents each of the four switches 0 i closed 1 open Returns the hex sum of the bit weights Bit weighting is as follows Bit Weight Use 0 01 Switch 1 1 02 Switch 2 2 04 Switch 3 3 08 Switch 4 NOTE Hex addition of bit weights gives all switch states Sets the value of any location in EEPROM memory POKE XXX YY term Nothing Return requires POKE Three ASCII digits XXX represent the decimal memory address from 0 to 511 Two ASCII digits YY represent the 8 bit data byte in hex No default Query the value in any location in EEPROM memory POKE XXX term YY term Three ASCII digits XXX represent the decimal memory address from 0 to 511 Returns two ASCII digits YY which represent the 8 bit data byte in hex No default Query instrument power on status PON term X term One ASCII digit X represents the instrument power on status 1 instrument powered off then on again since last PON query 0 instrument not powered off since last PON query Sets the value of any location in external memory XXXX YY term Nothing Return requires XMEM Four ASCII digits represent the 16 bit hex memory address Two ASCII digits represent the 8 bit data byte in hex No default Query the value in any location in external memory XMEM XXXX term YY term Four ASCII digits XXXX represent the 16 bit hex memory address Returns two ASCII digits
109. uracy 1 2 6 General Superconducting Magnet VSM Specifications SPECIFICATION EMU Dynamic Range EMU Noise EMU Time Constants EMU Stability EMU Absolute Accuracy EMU Reproducibility Field Noise Field Accuracy Field Stability Field Strength Temperature Range Temperature Accuracy Temperature Stability Temperature Uniformity Temperature Precision Helium Usage Helium Storage lt 0 05 of full scale per day constant H and 2 of reading 0 2 of full scale p p Introduction Introduction Lake Shore Model 9300 Cryogenic VSM User s Manual Figure 1 1 Typical Superconducting Magnet VSM System 1 4 Lake Shore Model 9300 Cryogenic VSM User s Manual This Page Intentionally Left Blank Introduction Lake Shore Model 9300 Cryogenic VSM User s Manual CHAPTER 2 PRE INSTALLATION 21 GENERAL The 9300 System was electrically and mechanically inspected and operationally tested prior to shipment It should be free from mechanical damage and in perfect working order upon receipt Study the 9300 User s Manual before attempting to run the system 2 4 4 Inspecting and Unpacking the Model 9300 Set pallets on level surface Inspect shipping containers for external damage Make all claims for damage apparent or concealed or partial loss of shipment in writ
110. xis software 2 00 WOO NOTE The Model 704 motion controller remembers its current position as long as it remains powered up It should not be necessary to repeat this procedure unless the power is switched off Upon power up the Model 704 starts up with its current position set to 0 Simply returning the flow control valve to 0 before powering down preserves the current setting Set the flow control valve position directly through either the FourAxis or the Virtual 340 front panel In the latter case type the desired setting into the Flow Valve edit box followed by the Tab key Valve settings are given in steps there are 400 steps per valve stem rotation The Virtual 340 software uses the Domains settings for automatic control over the flow control valve settings Each temperature domain has two fields for entering flow control valve positions During Ramp and After Ramp The During Ramp setting controls the valve position while the temperature setpoint is changing during a temperature ramp and until the first wait time has elapsed The After Ramp setting controls the valve setting after the first wait time has elapsed Access temperature domains using the Utilities gt Enter Domain Information menu item in the Virtual 340 software NOTE Temperature domains are either ascending or descending The starting temperature of a descending domain is higher than its ending temperature and vice versa for an ascending domain It is co

Download Pdf Manuals

Related Search

Related Contents

Manual de usuario Deshumidificador    Samsung S Series SH-S183L  modd. DH801PK e DH801PL MANUALE TECNICO  Flammable Materials Storage Refrigerator User Manual 50FREETSA  Limit Switches-Class 9007 Type C  Philips 190P5 Computer Monitor User Manual  Questionnaire Development System Version 2.1 User`s Manual  

Copyright © All rights reserved. Failed to retrieve file