BEST User`s Manual
Contents
1. CAEN ELS d o o Rev 1 1 October 2014 E gt c ad 4 at om g o lt CAEN ELS d o o Kra ka ulica 2 6210 Se ana Slovenija Mail info Qcaenels com Web www caenels com BEST User s Manual Table Of Contents INIBODUCTIUIN REED MEMINI RN a M FERE MM IM IUD renee ee 8 1 1 TETRA MIM OVERVIEW 10 1 2 BEST CONTROL AND INTERFACE UNIT OVERVIEW csceccccecececccecececeseecs 11 1 3 PREDAC OVERVIEW ccccceccsceccscecescecescscuccscecescscstecesescecescscscscesescusescecesees 13 2 BEST SYSTEM INSTALLATION e eee eee eee eee eee ee eee ee ee eee e ee eee eeoooe 15 2 1 CONNECT THE TETRAMM TO THE PHBPM cce 15 2 2 CONNECT THE PREDAC TO THE BEAMLINE OPTICS cere 16 2 3 BEST CENTRAL UNIT PC 5 5 00000 000000 17 2 4 BEST SYSTEM INTERCONNECTION 0 2ceececoeciiliecececcsceccsceccscecescscesescececes 18 2 5 BEST pe eee 21 2 22 3 1 MAIN WINDOW Sr rm 22 3 2 GRAPH XAY 23 3 3 FEEDBACK CONTROL SECTION ccccececceccccecescecescecectecnceecscescecnseececeececteces 25 3 4 gt dt ARARA WE 27 3 5 BEAMLINE CONFIGURATION cecocceceececenecessscscoscsceccscecesceceschenscecasescaseecncteces 28 3 5 1 Beam Position2. a 29 AEN Voltage ISE 30 WEM 30 3 6 UI RAMETERS mmm EE 31 3 7 REGION OF CONVERGENCE AND REGION OF INTEREST cesceceseececeececteces 34 3 8 SEBINFO HOR 2 UEM 35 BEST User s Manual April 16 2014 Document created and edited 1 0 0 July 24 2014 Main information and features added August 18 2014 Password font corrected October 29 2014 Manual graphics changed BEST User s Manual Safety information Warnings CAEN ELS will repair or replace any product within the guarantee period if the Guarantor declares that the product 16 defective due to workmanship or materials and has not been caused by mishandling negligence on behalf of the User accident or any abnormal conditions or operations Please read carefully the manual before operating any part of the instrument ZNWARNING A Do NOT open the boxes CAEN ELS d o o declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the User It is strongly recommended to read thoroughly this User s Manual before any kind of operation CAEN ELS d o o reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice Disposal of the Product The product must never be dumped in the Municipal Waste Please check your local regulations for disposal of electronics products BEST User s Manual
3. dedicated hardware with next generation FPGA to perform all the critical tasks as the system computation and correction calculations and e an industrial PC running Linux OS which allows the control of the system using a GUI Graphic User Interface software The dedicated fast speed hardware integrated in the next generation FPGA logic takes care of all the critical tasks like stabilization intensity control and positioning of the photon beam The FPGA logic receives the acquired data from all TetrAMM devices via a high speed SFP link the system can manage up to two TetrAMM devices The received data 1 e current outputs from the phBPM are elaborated to obtain the beam position and intensity information This hardware part performs also the control algorithms in an optimized way adding a very low delay to the feedback loop in order to guarantee the BEST correction performances over the frequency spectrum The computed correction are sent to the actuator block the PreDAC unit using the SFP interface 0 Introduction BEST User s Manual The non critical tasks are performed on the embedded industrial PC running a Linux OS The communication between the PC and the FPGA is performed trough a PCI Express protocol and so all the elaborated data and configurations of the dedicated fast speed hardware are accessible from the dedicated Linux graphic software The integrated BEST software has a user friendly interface
4. Read over the instruction manual carefully before using the instrument The following precautions should be strictly observed before using the BEST system Do not use this product in any manner not specified by the manufacturer The protective features of this product may be impaired 1f it 1s used in a manner not specified in this manual e Do not use the device if it is damaged Before you use the device inspect the instrument for possible cracks or breaks before each use e Do not operate the device around explosives gas vapor or dust e Always use the device with the cables provided e Turn off the device before establishing any connection e Do not operate the device with the cover removed or loosened e Do not install substitute parts or perform any unauthorized modification to the product e Return the product to the manufacturer for service and repair to ensure that safety features are maintained CAUTION e This instrument is designed for indoor use and in area with low condensation BEST User s Manual The following table shows the general environmental requirements for a correct operation of the instrument Environmental Conditions Operating Temperature Operating Humidity Storage Temperature Storage Humidity Requirements to 45 C 30 to 85 RH non condensing 10 C to 60 C 5 to 90 RH non condensing Introduction BEST User s Manual 1 Introduction The BEST Beamline Enhanc
5. beam in the desired position The correction information are then sent to the actuator block using a low latency SFP interface This critical task as the correction calculation is preformed directly in hardware using a FPGA device in order to have a deterministic computing time maximum calculation speed and minimum elaboration delay This particular architecture allows performing the control algorithms at a maximum speed and with very low latency in order to guarantee BEST correction performances over the frequency spectrum Otherwise the slower and non critical tasks like configuration commands are performed on the embedded industrial PC running a Linux OS with dedicated software The control and interface unit offers a local graphic interface which allows to monitor manage and control the beam position and intensity standard 10 100 1000 TC P IP Ethernet link allows the remote control and configuration of this system so it is possible to connect the control unit directly to the beamline control system The actuator device called PreDAC receives the correction compensation data given by the BEST control and interface unit and drives the beamline optics using its internal high precision digital to analog converters In this way it is possible to close the loop and to control and stabilize the X ray in a beamline A distributed architecture allows to maximize the performance of the system The Tet AMMI readout system can be placed clo
6. 1 1 0 0 0 5 1394191065 1406290175 Figure 24 SFP Info window 35
7. the one on the left Note that the order of the BNC connections with the phBPM is not important because the BEST Control and Interface Unit software permits to select the input channel configuration Figure 8 BNC input connectors 15 BEST System Installation BEST User s Manual The TetrAM MA unit has to be placed next to the current source e g phBPM detector in order to reduce cable lengths i e cable capacitance and to minimize consequent noise pick up It is also highly recommended to use high quality BNC cables to connect the TetrAMM device with the current sources On the front side of the TetrANAMA device is also placed a High Voltage SHV output connector which can be used as high voltage bias source for the detecting system The connector is similar to the BNC but uses a very thick and protruding insulator Figure 9 The insulation geometry makes SHV connector safe for handling high voltage sources by preventing accidental contact with the live conductor in an unmated connector or plug High Voltage SHV connector HVON OVC Gear For Science OCAENels Figure 9 High Voltage SHV connector the PreDAc to the Beomline optics The BEST suite has to drive the beamline optics in order to control and stabilize beam in the desired position and with the desired intensity This task is performed by the PreD AC device This unit is designed to control the piezoelectric driver which
8. which allows to configure the BEST system configure the system feedback actuation 1 e PID parameters and filtering monitor and elaborate the acquired data and control the beam position or intensity with a simple point and click positioning feature The remote control of the central unit is also possible using a Web Interface or the dedicated EPICS driver using a standard 10 100 1000 Ethernet link This provides the possibility to connect the BEST Control and Interface Unit directly to the beamline control system The BEST Control and Interface unit and its I O connections can be easily seen in Figure 4 front and in Figure 5 rear BEST Power Industrial PC Display button USB ports Figure 4 Front view of a BEST Control and Interface Unit T E gt IE x E EL Tttrtttttttftftr mu 4 f I Dedicated 4 SFP connectors Power Industrial PC and 2 triggers connector connectors Figure 5 Rear view of a BEST Control and Interface Unit 9 s BEST User s Manual Introduction PreDAC Overview PreDAC is a up to 4 channel 21 bit resolution wide bandwidth Digital to Analog Converter DAC which 1s especially designed for operation with the BEST Beamline Enhanced Stabilization Technology system The core of the PreDAC system is formed of high speed 16 bit digital to
9. BEST Control and Interface Unit or Central Unit allows to monitor and configure the system using a graphic software developed for Linux OS The dedicated software controls the dedicated fast speed hardware through the PCI Express protocol To use the Linux OS it is necessary to connect the industrial PC to a mouse keyboard and a monitor On the rear side of the BEST Control Unit Figure 5 there are the standard PC connection like e Display Port 1 HDMI I DVI 2 Ethernet 4 x USB 3 0 compliant In addition there are two additional USE slots on the front side of the BEST Central unit 17 BEST System Installation BEST User s Manual e U BEST System interconnection The TetrAMM and PreDAC units have to be connected with the BEST Central Unit which controls the whole system The communication between the units is obtained with a dedicated fast speed SFP optic interface On the rear side of the PreDAC and TetrAMM units there 15 dedicated SFP slot that allows the connection between the devices and the BEST Control and Interface Unit Firstly it is necessary to insert the SFP optics transceiver module into this rear SFP slots as shown in Figure 11 Figure 11 Connection of the SFP optic transceiver into its slot Remove the caps present on the SPF transceiver module and the caps on the cable connector and simply plug the cable connector into the transceiver module as shown in the following figure BEST User s Manual BEST Sy
10. analog converter that uses dithering technique and active low pass filtering to obtain stable high accuracy 21 bit output signal This device is capable of outputing 12 V bipolar voltage with resolution of 12 uV 1 e 21 bits of resolution on the bipolar output range Output voltage noise is Suppressed using a 4 order active low pass filter with cut off frequency 3 dB of 10 kHz Low temperature drifts good linearity and very low noise levels enable users to perform high precision voltage signal generation The PreDAC is typically fitted with two output channels but can be optionally upgraded to have three or even four output channels It is housed in a light robust and extremely compact metallic box that can be placed as close as possible to the actuator power driver in order to reduce cable lengths and minimize possible noise pick up It is specially suited for applications where multi channel simultaneous actuations are required a typical application being the control of position X Y and intensity 10 of the photon beam in synchrotron radiation X ray beamlines It is very important to limit the Pre DAC voltage outputs in order to revent an ossible damage of the connected units for example the piezo drivers To perform this task please refer to the MIN and MAX Commands of the Pre DAC User s manual The PreDAC communication to a host PC is guaranteed by a standard 10 100 1000 Mbps Ethernet TCP IP protocol while its
11. determinates the position of the monocromator and therefore the position of the beam In the accelerator facilities there are many different types of monocromators and so of piezoelectric drivers The PreDAC device is realized to give the maximum flexibility in order to adapt the device output to the major part of piezoelectric mirrors and drivers Different mirrors can have different degree of freedom and also so also the number of PreDAC output depends upon the specific system characteristics The most common configuration are with 2 or 3 output channels On the front side of the PreDAC device are placed the output BNC connectors which have to be connected with the piezoelectric driver and so with the optic system Channel incremental numbering as can be seen in Figure 10 is right to Q9 BEST User s Manual BEST System Installation left is the one the right while OUT4 is the one on the left Note that the order of the BNC connections with the piezoelectric driver is not important because output channel connection can be configured in the BEST software OUT4 OUTS OUT2 OUT1 Figure 10 PreD AC BNC output connectors The PreDAKC unit has to be placed next to the mirror system e g iezoelectric driv r in order to reduce cable lengths i e cable capacitance and to minimize consequent noise pick up It is also hiehlv recommended to use high quality BNC BEST Central Unit Connections The
12. ed Stabilization Technology is a software and instrumentation suite which was especially designed to control and stabilize the intensity Io and position horizontal and vertical of the photon beam in synchrotron radiation X ray beamlines The BEST instrumentation building blocks are the readout block i e TetrA MM device the control and interface block 1 e BEST central unit the actuator block 1 e PreD AC device A simplified block diagram of the BEST architecture is shown in the following figure Beamline Control System BEST Control and Interface Unit TetrAMM PreDAL Readout Actuator Figure 1 Simplified architecture of the BEST instrumentation suite BEST User s Manual Introduction In order to control and stabilize the X ray it is necessary to determinate the position and intensity of the beam For this reason the first building block of the BEST system is a readout device called Tetr AMM which is a picoammeter instrument with high sampling speed connected to a phBPM photon Beam Position Monitor The current from the phBPM are acquired and sent from the TetrANAMA picoammeter to the BEST control amp interface central unit using a very low latency SFP connection The BEST control and interface unit takes care of all the calculation to obtain the beam position and intensity information The BEST central unit calculates also the necessary correction to stabilize the intensity and position of the
13. ield and pressing Set HV button Fields Voltage readout and Current readout show the measured voltage and current on the output of HV module 3 5 3 DAC The DAC settings allow to configure the PPreD AC output connection with the piezo drivers which are used to drive the beamline optics For example if beam X position is regulated with piezo attached to PPreD AC output channel 2 a value of Position X field should be set to CH2 Q9 BEST User s Manual BEST Software PID Parameters This window which is accessible by clicking on Settings gt PID Parameters allows to configure the PID parameters which are used in the FPGA logic for BEST fast feedback computation algorithms The BEST system can control and stabilize up to three variables X position Y position and intensity in parallel and in this window it is possible to set the parameters related to each of the three regulators Figure 21 PID Parameters Position X Position Y Intensity IO Freq 2000 00Hz Freq 1000 00Hz Freq 3000 00Hz Real freq Real Real Freq Kp 0 30000 Kp 0 30000 Kp 0 30000 Ki 0 10000 Ki 0 10000 Ki 0 10000 Kd 0 01000 0 01000 Kd 0 01000 e min 0 00000 e min 0 00000 e min 0 00000 I max 0 20000 max 1 00000 max 0 10000 O min 0 00000 O min 0 00000 O min 0 00000 O max 12 00000 O max 12 00000 max 12 00000 O gain 1 00000 O gain 1 00000 O gai
14. int and Click Positioning 24 BEST User s Manual BEST Software 3 3 Feedback Control section All setting regarding the feedback control can be found on the left side of the main window This section is called Feedback Control Feedback Control mean std dev X Y 10 Heartbeat quu Feedback ON Controt Disable Feedback Reset Controller Conf Position X amp Y Update Config posX 4 883 um pos 4 080 um 10 0 0 2 0 4 0 6 0 8 1 Update Setpoint Figure 18 Feedback Control Section On the top of the Feedback Control section are visualized the mean and standard deviation of the beam position X Y and the beam intensity Io A Heartbeat indicator shows the status the feedback status There are 4 available feedback loop status e Feedback OFF Feedback is disabled and on output there are only user defined offsets This mode can be used to manually position beam in desired position e Feedback ON Feedback is enabled on the output there is a user defined offset with addition of PID calculated value With right settings of the parameters beam position should be located in the user defined position e Fault Out of ROC This is an error message when beam position moved outside user defined region of convergence The feedback loop is paused and it can be reset with a click on Reset Controller button OL BEST Software BEST User s Manual e Beam OFF Indicates that bea
15. integration in the BEST Beamline Enhanced Stabilization Technology system is performed via the SFP link present on the rear panel The PreDAC unit and its I O connections can be easily seen in Figure 6 front and in Figure 7 rear 13 Introduction BEST User s Manual ON CL and STATUS LEDs Output Channels Figure 6 front view of a Pre DAC unit Power Switch Power connector Trigger Power arta connectors Configuration Interlocks and LED general input output Reset Ethernet and SFP connector button communication interfaces Figure 7 rear view of a Pre DAC unit Q9 BEST User s Manual BEST System Installation 2 BEST System Installation The following sections describe the various steps to interconnect the BEST instrumentation rhe_TetrAmMMmto the phBPM The first building block of the BEST instrumentation suite is the TetrAMM picoammeter This unit is designed to read and convert in digital form the currents from the phBPM photon Beam Position Monitor This data are essential to determinate the position and the intensity of the beam The TetrAMM has to be connected with the phBPM using the four analog input connectors placed on the front side of the unit The BNC connectors are miniature quick connect disconnect RF connectors mainly used for coaxial cables Channel incremental numbering as can be seen in Figure 8 is right to left CHI is the one the right while CH4 is
16. inux OS Ubuntu To run the program simply click on the BEST Local User Interface icon present on the Linux desktop The default Linux OS user and password are case sensitive e User best e Password WeAreTheBest 3 1 Mein Window The main screen of the BEST Local User Interface is shown in Figure 15 Control Disable Feedback Reset Controller Conf Position X amp Y Update Config posX 1 939 um posY 8 204 um 10 0 00 Update Setpoint Reset Zoom Target Enable Graph FFT Graph Currents Graph DAC Graph Position Figure 15 BEST Local User Interface main window A graph in the center shows beam position in XY plane On the bottom various possible plots can be selected to better analyze beam or to better understand feedback system On the right a Feedback Control allows user to operate feedback controller Before starting feedback system some additional settings should be adjusted according to the beamline configuration This will provide a system basic understanding how the beamline is composed The BEST system settings are accessible under the Settings menu All settings found there are related to beamline configuration and are not meant to be changed frequently during system operation The available BEST settings are illustrated in the sections Graph XY shows beam position in XY plane Figure 16 The graph is updated in real time and plots the beam positio
17. l smaller values are trimmed to zero In most cases this parameter should be set at zero although it can be used to avoid eventual limit cycles in the loop regulation The I max parameter determinates the saturation limit of the integral part of the PID controller The PID output is limited between O min and O max values There are additional limits of minimum and maximum value of the PreDAC output which work at lower level and therefore provide additional protection Please see PreDAC User s Manual MIN and MAX Commands It is very important to set this values in order to prevent any potential damages on the input stage of piezo driver The output of PID controller is multiplied by O gain value to change the gain of the closed loop and can be also used to invert PID response Normally this parameter is set either to 1 or 1 If certain beam position decreases with Output offset increment then O gain value should be set to 1 to change the polarity of correction otherwise it should be set to 1 Offset value should be set to position the beam in the operating point Initial value should be set at middle of the piezo driver input range to allow maximum excursion from central point On the press of the buttons Apply or new parameters are downloaded to controller on the FPGA and they take effect immediately However click on the 9 E3E S T User s Manual BEST Software button A
18. m intensity went bellow user defined Beam Off Thershold which indicates that beam was shut down A feedback is paused since it makes no sense to stabilize a non existing beam The Enable Disable Feedback button allows to start or stop the feedback regulation The Reset Controller button resets all eventual internal states e g integrated value of error of the PID controller to User can select which variables should be controlled from the BEST system by selecting desired configuration from Conf selector and pressing Update Config button On the bottom of the Feedback Control section it is possible to enter directly the desired beam position and intensity New values take effect after Update Setpoint button is pressed Aa oa BEST User s Manual BEST Software 3 4 Login This dialog allows to access at different levels to the BEST Local User Interface Various access levels prevent inexperienced users to change system critical settings User interface has three different access levels e Administrator mode it is allowed to change all the beamline related settings Username for this mode is admin and the password is WeAreTheBEST e User mode it is not allowed to change the beamline related settings but it is possible to change setpoint and feedback configuration Username for this mode 1s user and the password 1s BeamlineUser e Cruise mode it is not allowed to change any configuratio
19. n 1 00000 Offset 2 20 Offset 2 40 Offset 0 00 Apply Figure 21 PID Parameters window The BEST Control Unit receives the current data from the TetrANANA unit trough the fast SPF connection at a constant time interval of 10 5 which correspond to 100 kHz A filtering 1s applied on the received data to improve the signal to noise ratio and to reduce the feedback actuation frequency This frequency can be set using the field Freq This parameters depends over the beamline mechanics The averaging is done on a definite number of samples so only certain frequencies can be obtained e g if the averaging is performed on 5 samples a frequencies of 20 kHz will be obtained and the nearest values can be 25 kHz for averaging on 4 samples and 16 66kHz for averaging on 6 samples The Real freq BEST Software BEST User s Manual field shows the nearest applicable actuation frequency value based on the Freq setting The Kp Ki and Kd parameters are used to calculate the well known PID algorithm Figure 22 Emin Imax 62 z GQmin T Omax Process o KE Output variable Omir Ooffset Figure 22 PID Regulator architecture In addition there are several other parameters which can further optimize PID controller and therefore improve system performance The e min value determinates the smallest error value which is taken into account for the PID calculation Al
20. n calculations performed in the last second In this way user can geta Bo of a beam distribution in time Reset Zoom Target Enable 23 Figure 16 Graph XY As described before the control of the beam position can be performed in different configurations For example it is possible to control the beam in a single dimension 1 e Y dimension is regulated by the system and X 15 fixed or in both dimensions i e X and Y dimensions are regulated by the system When controller only acts in one dimension the setpoint 1s obviously a line pointer otherwise it acts in two dimensions the setpoint 1s represented as a cross pointer With a green rectangle is shown Region Of Interest 1 e an area where user can position a beam setpoint red rectangle shows the Region Of Convergence ROC i e an area where controller acts on the beam position If in any case beam position leaves the ROC the feedback regulation is paused The dimension of this areas can be changed in the relative configuration window see Region of Convergence and Region of Interest chapter In this window is possible to perform also the Point and Click Positioning This feature allows user to move the beam to the desired position by simply clicking on a XY graph area To enable this feature it is necessary to select the Target Enable button An example of this feature is shown in Figure 17 g Target Enable Figure 17 Po
21. n of the BEST system but is only possible to visualize the acquired data Username for this mode 15 cruise and it has no password An example of a login dialog 1s shown in Figure 19 User can access to this window by clicking on Settings gt Login Current level field shows current access level and is changed whenever a new correct combination of username and password is entered Username admin Password PasbbibRRRE Current level cruise Figure 19 Login window 21 BEST Software BEST User s Manual 3 5 Beamline Configuration This window allows to set the BEST system to correspond actual beamline configuration User can access to this window by clicking on Settings gt Beamline Beamline Configuration Position X CH1 Position Y CH2 Intensity CH3 Beamoff Threshold Orientation 90 Ch2 gt cna X scaling 50 000um x Y scaling 50 000um HV Status HV ON Enable HV 20000 j Set HV Bias voltage Voltage readout 20290 Current readout 1 00UA Cancel Figure 20 Beamline Configuration window A quick overview of the available beamline configuration options are represented in the following chapters 28 BEST User s Manual BEST Software 3 5 1 Beam Position Monitor The BPM Beam Position Monitor section allows to set the phBPM orientation select how the channels of TetrAMM are connected to phBPM and to insert scaling factor
22. pply does not close this window This is useful feature to quickly tune parameters to achieve better performance from the controller 33 BEST Software BEST User s Manual 3 7 Region of Convergence ond Region of Interest Before enabling regulator user should set region of convergence and region of interest By clicking on Settings gt ROC ROI a new window shows up which enables user to set desired values Figure 23 ROC ROI Settings This values use parameters X and Y Scaling from Beamline Settings window Make sure they are correct roiX 20 00 um roi Y 20 00 um ROIIO min 10 00 ROI IO max 30 00 ROC 12096 of ROI n Figure 23 ROC ROI Settings window Region of Convergence ROC is the area in which regulator stabilizes the beam to a certain setpoint If in any case beam position goes outside of this area the controller pauses the regulation loop and shows the error Beam out of ROC Region of Interest ROD is an area in which beam position can be set by user either by pointing and clicking Figure 17 on XY graph or by entering desired values Q9 BEST User s Manual BEST Software 3 8 SFP Info The SFP Info window which is accessible by clicking on Settings gt SFP Info shows current devices connected to the SFP Connectors placed on the rear side of the BEST Control Unit SFP Info 1 2 3 4 FASE ENT ERI ACE 2 TetrAmm Fastin PreDAC Fast 3 14002 14001 4 1 0 1
23. rifts good linearity and very low noise levels enable users to perform very high precision current measurements TetrAMM is housed in a light robust and extremely compact metallic box that can be placed as close as possible to the current source detector 1n order to reduce cable lengths and minimize possible noise pick up It is specially suited for applications where multi channel simultaneous acquisitions are required a typical application being the currents readout from 4 quadrant photodiodes used to monitor X ray beam displacements TetrANANA communication is guaranteed by a standard 10 100 1000 Mbps Ethernet TCP IP protocol and its integration with the BEST Beamline Enhanced Stabilization Technology system is performed via the SFP link The TetrANAMA unit and its I O connections can be easily seen in Figure 2 front and in Figure 3 rear High Voltage Input Channels output STATUS High voltage LEDs Measuring range and status LEDs Figure 2 front view of a Te tr AMM unit Q9 BEST User s Manual Introduction Power Switch 2 connector a rlock and ower an nterlocks an Configuration Dp general Reset Ethernet and SFP LEDs input output button communication connector interfaces Figure 3 rear view of a Te tr AMM unit lo BEST Control ond Interface Unit overview The BEST Control and Interface Unit or Central Unit is a 1U rackmount system which houses e
24. s in the beam position calculations In a standard 90 phBPM system the X Y and Intensity Io of the Beam are calculated with the following formulas 1 RIGHT 1 LEFT X K X 1 RIGHT di LEFL Y 1 1 Y I top I BorToM I opt 1 lert JF ricer where Irop IRigHT and represent the acquired input channels values and user should select how TetrAMM channels are connected to the detector Kx Ky are the scaling factor for X and Y dimension respectively In some cases a second phBPM 15 installed on the same beamline with the phBPM system rotated CW by 45 in order not to get shadowed by the first blade set and the computation needs to be modified The equation used in a 45 rotated phBPM system are the following y x Ran H sorrow rion U ror terr Heorrou uer PX Gee 1 TOP RIGHT 1 BOTTOM_RIGHT TOP LEFT al BOTTOM_LEFT y g Mor err U Borrov H Borrom err Y 1 TOP RIGHT 1 TOP LEFT 1 _ BOTTOM_LEFT L l tot lerr t RIGHT 29 BEST Software BEST User s Manual 3 5 2 Bias Voltage This settings allow to set the bias voltage for the detecting system Field HV Status shows whether HV module on the TetrAMM is turned ON or OFF Module can be turned on by clicking on Enable HV button Then the bias output voltage can be set by entering desired value in Bias voltage f
25. se to the phBPM and the PreDAC system close to the beamline optics In this way the noise pickup is very low The internal BEST computation and communication between the system devices are performed in fully digital way and so there are not additional noise sources that can affect the control and stabilization loop performances The building blocks are interconnected via low delay fast communication SFP links running a proprietary protocol The SFP links on the back of the BEST Control unit are directly interfaced to a powerful FPGA board that performs the position and control algorithms and send correction values to the DACs placed on PreDAC device The BEST system has one of its main focuses on configurability and expandability being able to control and monitor up to two readouts Tetr AMM devices i e up to 8 picoammeter channels and up to two multichannel actuators PreDAC devices i e up to 8 channels from one single BEST control amp interface unit Introduction BEST User s Manual TetrAMM overview CAENels TetrAMM picoammeter is a 4 channel 24 bit resolution wide bandwidth wide input dynamic range picoammeter with an integrated high voltage bias source It 1s composed of a specially designed transimpedance input stage for current sensing combined with analog signal conditioning and filtering stages making use of state of the art electronics This device can perform bipolar current measurements Low temperature d
26. stem Installation TOtrAMM polar picoammeter el Fast Interface Bi 4 chann Figure 12 SFP connection Note that it is not necessary to connect the Ethernet cable because the TetrAMM PreDAC devices operates as a slaves of the BEST Control and Interface unit The Ethernet communication is still available but it operates in read only mode The optic cables from the peripheral devices have to be connected to the BEST Central Unit Similar as for the Tetr AMM and PreDAC devices the SFP optic transceivers should be plugged into the dedicated slots on the rear side of the BEST Control unit but in this case the correct orientation of the SFP transceiver is upside down On the rear side of the BEST Control and Interface Unit there are 4 SFP slots Channel incremental numbering as can be seen in Figure 13 is right to left SFP is the one the right while SFP D is the one on the left Reserved connectors for future use Dedicated 4 SFP connectors and 2 triggers 19 BEST System Installation E3E S T User s Manual Figure 13 BEST Control unit SFP connection The order of the connection is important for the BEST Control unit to communicate with the right device The connection should be SFP A 2 1 Tetr AMM SFP B gt 2 TetrAMAMA optional feedback supervisor SFP C gt PreDAC SFP D Reserved 20 BEST User s Manual BEST System Installation 2 5 BEST eustem power up The BEST instr
27. uments can be now connected to the mains power The TetrAMM and PreDACc units use the CAENels PS1112 power supply The PS1112 linear power supply can be used either with a 115V 60Hz AC power line e g United States or with a 230 V 50 Hz AC Line e g Europe be sure to select the correct input voltage rating by switching the AC Line Voltage Select switch placed on one side of the box Possible switch positions one for each input voltage rating are shown in the following Figure 14 230V and 115V respectively AC Line Voltage Select switch for 230V operation AC Line Voltage Select switch for 115V operation Figure 14 PS1112 AC line voltage select switch The BEST Control and Interface unit is powered using an internal power supply unit with extended input voltage range 100 240V The BEST units are now ready to be used To switch on the units use the power buttons located on the rear side of the TetrAMM and PreDAC and on the front side of the BEST Control Unit At this point the power cables can be connected to TetrAMM PreDAC and BEST Central Unit and the system is ready to be used 21 BEST Software BEST User s Manual 3 BEST Software This chapter describes the main features of the BEST graphic software interface called BEST Local User Interface To execute the program 1t is necessary to power on the BEST Control and Interface unit The BEST Local User Interface is already installed on the L
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