140 GHz one channel Interferometer - ELVA-1
Contents
1. User Manual 5 2 Operation frequency Test setup in presented below Horn trainer H Horn _ Frequency Meter lt lt ____ gt lm ELVA 1 Measured data Fout 140 004271 GHz D band Interferometer 21 User Manual ELVA 1 5 3 AGC signal Test setup in presented below anne 10dB Direction Coupler Direct reading Variable attenuator lt 0 70dB 10dB AGC signal Direction Coupler signa Receiver AGC signal vs Attenuation AAAA LETT LD UAT LLEVA ELE CLEA LULA LEVEE LELELEE TEETER EE 40 45 50 55 60 65 70 75 80 85 30 95 Attenuation Tx to Rx channel dB D band Interferometer 22 User Manual ELVA 1 5 4 Accuracy measurement Test setup in presented below Direct reading 10dB Variable attenuator n Direction Coupler 0 70dB Horn Horn ee E ee 1 5m Baieri epee PO a er eee aks Ej Measured data Accuracy measurement is lt 0 07 radians D band Interferometer 23 User Manual ELVA 1 5 5 Test Measurement of real time signal Test setup in presented below pak aaa PC g PREP soleno wy H Receiver Coil spring Movable metal reflecto r Power supply Trigger Oscillator Oscilloscope Principle of operation apply voltage to electromagnetic solenoid and move reflector Coil spring returns reflector in initial position Micrometer check actual2. j Measure Close 5 Software generates file name with real time indication 00129 _ 20130912 173640 ifr where discharge No_year_moth_day_hour_min_sec The file structure 1s N 2500000 0 26536 15012 22352 21668 2 16776 26408 3 10132 29120 4 2908 29928 Where N quantity of measurements No of measurement _ ADC 16 bits code I channel _ ADC 16 bits code Q channel D band Interferometer 15 User Manual ELVA 1 4 3 View and Save data To view saved data come to main menu or run one more Interferometer software and then press button View Selection file window is appeared Manka data F Uma ata vsmMeHeHua Tun 00129 20130912 173640 ifr 12 09 2013 17 36 Matin IFR HepasHne _ MecTa Pa6ounit cton BuGnuoteku A Dar Komnbiotep Cet Vima patina 00129_20130912_ 173640 Tun pa nos Raw data Jifr Select file and press open when software recalculates raw data and draw result ee Cee 550 B Back opie tad Sat rsa lipit cana ee CSOs POS oh Po Powe oe ee ee ial coe icine meee D band Interferometer 16 User Manual ELVA 1 User can switch On Off presented data to use flags into window Nol Below is example with measured data only a bakit TUTE H X x all nar B r P Ct ell Oe i T i F oe cere J J EeEa ie LA 2 ee sb The result of measurement can be presented as a phase shift in radians Y axis is graduated
3. in radians or electron density Y axis is graduated in 104 18 m43 To see result in radians in window No2 1 000 should be entered picture above and 0 4143 as presented below Lug Ve F F i x Hpi Eas T dj Prai miini T i F ELIEL a a aaa e e a a a ca 8 mee ee D band Interferometer 17 User Manual ELVA 1 There is possibility to install markers at measured dada For that press marker list activate flag add markers window No3 and then select desired point by using PC mouse tool estos WOW Po oreo ee ee To save data as image in bmp format press Export image enter file mane and select folder for saving be nn pete Deis a cl UL ey bares walt m 4 E E a E O D band Interferometer 18 User Manual ELVA 1 To save final data in txt format press Export data enter file mane and select folder for saving Software stores data in file xxxx ifd Tee Aha Bel bie mre E 4 4 Software tools Plot bounds Set limits for axis Present data in min to max data scale X axis Y axis X and Y axis Zoom buttons Scroll oe 4 aie T Button to set scroll sensitivity H a D band Interferometer 19 User Manual 5 FUNCTIONAL TESTS 5 1 Output power Test setup in presented below Transmitter lt s Power sensor Measured data Pout 104 4 mW D band Interferometer Power sensor Indicator ELVA 1 20
4. tuning procedure the user should test trigger operation of system as it was described above D band Interferometer 13 User Manual ELVA 1 4 MEASUREMENTS 4 1 Put into operation 1 Connect cable with trigger signal from TOKAMAK control system to opto isolated BNC connector 5 on the receiver The trigger pulse should be TTL standard and has duration no less then 1 ms The interferometer starts to collect data with rise front of the trigger pulse 2 Run software and put into menu Measure W Interferometer Eg View Test Quit 3 Enter discharge serial No 1 and select folder 2 for saving data and then press Measure 3 for regime waiting a trigger e IF Measurer gt Connection IP address 192 168 10 50 UDP port 63 r Output Discharge ng Folder C Users 800378 Deskto p data 3 eee Measure Close 4 The system is ready for measurement D band Interferometer 14 User Manual ELVA 1 4 2 Measurements After start up procedure the system is waiting for trigger When trigger pulse is appeared software automatically save raw data into selected folder add 1 to discharge serial No and then comes back into regime waiting for trigger To stop circle of collection data press button Close E IF Meacurer xa r Connection P address 192 168 10 50 UDP port 63 Qutput 129 Discharge a Folder C Users 800378 Desktop data Browse
5. LVA 1 2 4 Principle of operation The interferometer operates at fixed frequency Due to all built in oscillators are phase locked by one reference Cristal oscillator 100 MHz there is a possibility to control phase shift of mm wave signal is passed through plasma Mm wave oscillators transmitter and LO for receiver are built on one principle The transmitter consists of ultra low phase noise DRO 7 0 GHz direction coupler 1 10 doubler and multiplier x10 with integrated high power amplifier at 14 GHz The direction coupler provides 7 0 GHz signal for receiver The transmitter generates output frequency at 140 00 GHz 7 0 GHz x20 The mm wave receiver consists of VCO 6 9 GHz direction coupler 1 10 doubler multiplier x10 with integrated high power amplifier at 14 GHz and balance mixer For stabilization IF signal and phase locking LO frequency the signal 7 0 GHz from transmitter 1s used After down conversion the signal from transmitter we have IF frequency 2 0 GHz Then this signal is amplified by LNA and comes to power amplifier with built in AGC system AGC system allows to keep stable amplitude of IF signal in 30 70 dB attenuation range in mm wave channel Response time of AGC system is 2 5 microsec Then stabilized IF signal is applied to IQ mixer where as LO oscillator synthesizer 2 00010 GHz is used The synthesizer 2 000010 GHz is also phase locked by reference Cristal oscillator 100 MHz IQ mixer provides two IF signals 100 kHz sin a
6. User Manual ELVA 1 E ELVA www elva 1 com sales elva 1 com USER OPERATION AND MAINTENANCE MANUAL D band one channel Interferometer Part No MMI 140R2 2013 D band Interferometer 0 User Manual ELVA 1 Table of Contents 1 Introduction 1 1 General Description 2 Specifications 2 1 Electrical 2 2 Mechanical 2 3 Block diagram of interferometer 2 4 Principle of operation 3 Installation and Functional Tests 3 1 Assembly procedure 3 2 Test and tuning procedure 4 Measurements 4 1 Put into operation 4 2 Measurements 4 3 View and Save data 4 4 Software tools 5 Test report 5 1 Output Power 5 2 Operation Frequency 5 3 AGC signal 5 4 Accuracy of measurement 5 5 Test measurement of real time signal D band Interferometer 1 User Manual ELVA 1 1 INTRODUCTION This instruction manual contains information on installation and operation of the D band Interferometer 1 1 General Description D band interferometer is intended for measuring the line averaged density of a plasma along the path through which the mm wave beam is passed through phase shifts in the propagated beam Base principle of operation is an effect of change of phase speed of electromagnetic waves of a millimeter range in plasma depending on density D band Interferometer 7 User Manual 2 SPECIFICATIONS 2 1 Electrical Specifications RF Frequency LO Frequency Frequency Stability Time Phase Analyze Time collect
7. al ELVA 1 3 INSTALLATION AND FUNCTIONAL TEST 3 1 Assembly procedure The interferometer can be installed directly near windows of TAKAMAK or removed from it by extension WR 42 waveguides as it presented on picture below Wave guide layout sceme for Interferometer Mote 1 Total length of the wave guide transmitting and receiving 1E m 2 Toatl path travelled by wave 20 5 m 3 Total path loss 40 dB 3 Diameter of the 55 pipe in which antenna is fixed 70 mm 600 cm 256 cm Plasma Path Tokamak 20 cm interfrometer 143 em system 460 erm D band Interferometer 6 User Manual ELVA 1 Waveguide s set of the interferometer consists of the following components Waveguide transition WR 06 UG 387 U M to WR 42 UG 595 U Horns WR 06 UG 387 U M UG 387 U M WR 6 165x0 83 D band Interferometer 7 User Manual ELVA 1 After setting waveguides the following connection according block diagram of the interferometer should be done Transmitter output Receiver input D band Interferometer g User Manual ELVA 1 1 7 GHz reference signal from the transmitter 1 to receiver by coaxial cable with SMA connectors The system is completed 2 cables one is spare 2 Power supplies via applied cables with DB 9 connectors Power supplies are equal and can be used any for transmitter and receiver D band Interferometer 9 User Manual ELVA 1 Receiver to PC station by TP5 cab
8. gger pulse or make short cut to BNC connector 5 After collection of data come back to main menu press Close and then select View mode Open fil Lax Manka J data e ey E i Uma ata vsmMeHeHua Tun a a 00129_20130912 173640 ifr 12 09 2013 17 36 a n IFR HenaBHue MecTa Pa6ounit cton ae zl Bu6nvotekn A w Komnbiotep a 4 il p Ceme Vima pa na 00129_201 30912_173640 v OT KphiTo Tun pa nos Raw data ifr Omena Select file with set before discharge No and open it after that measured result is appeared Picture below demonstrates correct operation of the system erien Ciel een loge Pe L TFT D band Interferometer 12 User Manual ELVA 1 After passing table test the system can be installed on TOKAMAK Assemble and adjust complete system and before starting to work the user has to test and tuning horns if it is needed For that the user should switch on system in Test mode and check form of IF signals and level of AGC system To control sinusoidal wave form of IQ signals and AGC signal tune horns such way to get minimum available level of AGC signal Below dependence of AGC signal vs attenuation in waveguide channel is presented For reference total attenuation in assembling system with installed horns in open area should be about 60 dB that corresponds to about 2 95V output of AGC signal AGC signal vs Attenuation Attenuation Tx to Rx channel dB After
9. ion Phase error measurement Data rate of real time density Real time density interface Real time signal rate 10 Output RF Power 11 Max attenuation Tx Rx 12 IQ Detector Frequency 13 RF to IF Gain 14 Conversion Loss of Mixer 15 Noise Figure 16 Gain of Horn 17 Waveguide 18 Flange 19 Data interface 20 External trigger 21 Input impedance of trigger input 22 Waveguide transition 23 AC Power 24 Operating temperature range ee ee ae 2 2 Mechanical Specifications 1 Transmitter 2 Receiver D band Interferometer ELVA 1 140 0 GHz 138 0 GHz 10 ppm 5 us 1000 ms 0 07 radian 10kHz voltage 0 1 5 0V 15 4 Rad V 100 mW gt 90dB 100 kHz 70 dB with AGC system 9 dB 12 dB 30 dB WR 06 UG 387 U M TCP IP Ethernet TTL 50 Ohm WR 06 to WR 42 220 VAC external modules 10 C 4 50 C 300x205x70 mm 250x235x70 mm User Manual ELVA 1 2 3 Block diagram of the interferometer 7 GHz out TRANSMITTER Horn SMA RECEIVER VCO Coupler Doubler IMPATT 6 9 GHz Multiplier x10 7 GHz in Balance SMA Mixer IF 100 MHz Phase PA with Detector AGC Reference Crystal Synthesizer Oscillator 100 MHz 2 00010 GHz aes Sin Cos AGC signal 4 pins connector 100 kHz Real Time TCP IP interface RJ 45 Controller at Controller Pa signal TCP IP With ADC TIL External trigger Opto isolated BNC D band Interferometer 4 User Manual E
10. le with RJ 45 connector 4 Special cable for control IF signals 100 kHz and AGC signal 5 BNC input for external trigger TTL pulse 6 SMA output Real time density 0 5V Connect all BNC connectors any oscilloscope for control 100 kHz IF signals and AGC When all connections are done complete PC station with standard monitor keyboard and mouse and switch ON all power supplies and PC D band Interferometer 10 User Manual ELVA 1 3 2 Test and tuning procedure Before installation the system on TOKAMAK it can be tasted on table Assemble the system as disrobed above and place Tx Rx modules as presented on picture below Then run program Interferometer placed on desktop the main menu of program appears E Interferometer Eg For test IF signals 100kHz and AGC signal test mode should be run press button Test and real time oscilloscope window with 100 kHz IQ signals appears D band Interferometer 11 User Manual ELVA 1 For test trigger operation Measure mode should be run press button Measure and new sub menu is appearing E IF Measurer Connection IF address 192 168 10 50 UDP port 63 gt Output Discharge no 139 Folder C Users 800378 Desktop data then press button Measure in sub menu for waiting a trigger pulse Enter discharge No and select folder for saving data Apply tri
11. nd cos which are digitized by built in 12 bits ADCs The controller converts digital data in Ethernet pockets and transfers them via TC IP interface to PC station PC station collects data from the interferometer and calculates absolute phase changing during discharge of plasma The software operates the following way as 100 kHz signals and trigger of ADC converters are locked by one reference we can control only pass zero points of IF signals without any additional reference signal i e relation between period of IF signal and quantity of digitized points inside of this period is constant in anytime without plasma Such way we get absolute rate Pi digitized points po and can control phase shift of signal during discharge of plasma As we have two 100 kHz signals from IQ detector sin and cos total pass zero points is four times more and finally time phase analyze is 2 5 microsec The software calculates time different between close pass zero points and compare it with absolute rate Then sum different between actual and absolute rate S omn n 1 Where n number of current pass zero point from the beginning of discharge N total quantity pass zero points during of discharge After collection data and calculation total drift of phase the software recalculate phase in absolute changing of density of plasma with rate 0 4143 104 18 m 3 operation frequency 140GHz diameter of plasma 0 4m D band Interferometer 5 User Manu
12. shift of reflector Trigger oscillator provides pulse for apply voltage to solenoid and run the system D band Interferometer IA User Manual ELVA 1 Measured data Micrometer 8 8mm that corresponds to 8 8 2 14 wave length for 140GHz 6 28 25 8 rad Real time signal on the oscilloscope dU 1 684V that corresponds 1 684V 15 4 Rad V 25 93 rad e m Acquisition is stopped 500 Sais eS Donsity 1 0 210 18 m 3 D band Interferometer 25
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