S-band Beam Position Monitor User`s Manual
Contents
1. ME Active switch Inactive switch is a Built in Beam Sa E aeS Reese Trigger Ori Cox Kee D LEADER orl ms vil IE ES jE EEN Enabled Disabled SOS SES GR SR orgies ess Processing cap o H Hie e s zj EE Ge UP PRIE guise DO sg OF done T amp H or T a UST TG pone gen fe or UE Heures S De eo ois pE pcos S UU 0 cof D ru DOWN gel sd Le Ont EES S amp H BS Gees QE 20 SS en gagapi a onm 63 CO Su CH as Uc lees E D OA tes UU ier of oi EU jG E SM o8 p CH lg H TRG ADC OUT Edge ca i Mode In S amp H Mode 7 UP UP DOWN T Negative Positive Timing In T amp H Mode UP DOWN DOWN UP DOWN T amp H S amp H S amp H or T amp H Positive Negative Output signals XOUT and YOUT track the position given by A B C an2. leck OO OC HIHIHI O 2 CH C4 IR rtl a d ae ae 2000 Wes oz CO DI DEN DEU 022009000000 7 DES pe Den J aat ws Wi U V 00 panupo Don TO l oo al He D r dank LE Boog Fong vA ose Dose Ste E go UU Kas l 0000 HT Sf NZ LES G Dy ae R Fam MO nee t 0000 11 00 aoa N UDO DD 00000 ome d v i BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 7 User s manual MODES OF OPERATION FOR VARIOUS BEAMS S BPM can be equipped with many options then further configured by the user to support many modes of operation Track Continuous T Mode Does not require Sample amp Hold option Does not require Built in Beam Trigger option Output bandwidth DC to 10 MHz T mode is indicated whenever fast beam motion must be observed e CW beams in general e Linacs and synchrotrons with bunch repetition rate up to 3 GHz e Betatron osc
3. ME Active switch Inactive switch fess EE pra arama a Built in Beam a Go ones hai ot E Trigger R Be Chez DC e RE GN UP DOWN TW tie ede TEST ES Enabled Disabled a SSR St ory cee Processing ef Mg ie SE ISS TS E Se UP Boe D on nan ee RE nes oF TER S T amp H or T z oo ego GRS H ae 108 oD d ag dires DU eae T c CH DOWN Hen LE aot a0 A GH as doer Gees Sut Be 0 Site teen RE aa KE Od UU oy CH QUE as sl der AE d SIS an TRG ADC OUT Edge ra i DIE Mode In S amp H Mode 7 UP DOWN UP erh S R Timing Hold Clock T n ode P DOWN Up DOWN cA E DOWN Positive Negative S amp H or T amp H BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 16 User s manual SAMPLE amp HOLD MODE Cont d In Sample amp Hold Mode the output signals timing looks like this File Vertical Timebase Trigger Display Cursors Measure Math Analysis Utilities Help 3GHz input macropule E TRG ADC OUT for oscilloscope From TRG ADC OUT trailing triggering edge XOUT is good to be read Be by AD XOUT Wes d Good value on XOUT L 400ns i
4. To change the configuration from Rotated to Orthogonal or vice versa change the jumper The pickup configuration is set with two jumpers position CHANGING PICKUP CONFIGURATION Orthogonal pickups position of jumpers Jumpers position for Orthogonal pickups DE ooo Cr Oo C G o DE CH CH TICE ET CHO RA NU CH Cig Rotated pickups position of jumpers Jumpers position for Rotated pickups
5. ECH AS LS Buit in trigger circuit PCAN ET LJ et RA NU CH YOU JUST RECEIVED A BEAM POSITION MONITOR Determine which options are installed Cont d S BPM with A B C and D direct outputs option S BPM ABCD can be recognized e The printed circuit board is equipped with A B C and D output connectors Direct output connectors for Channels A B C D S BPM with Built in Trigger option S BPM TRG can be recognized by e The printed circuit board is equipped with a built in trigger circuit
6. BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 18 User s manual QUICK CHECK S BPM in Track Continuous Mode Track Continuous mode can be used on CW beam or macropulse burst mode A Quick Check is described for both modes successively For CW beams If you wish to use an S BPM whether or not it has the Sample amp Hold option S BPM SH its switches must be set according to chapter TRACK CONTINUOUS MODE Unless otherwise specified S BPM without Sample amp Hold S BPM SH option has following ex factory settings Orthogonal pickups Mode Track Continuous Built in trigger Disabled ADC Trigger output positive edge Setup to check immediately that your S BPM system is working If you have the table top test kit BPM KIT use the following set up S BPM Beam 15V Oscilloscope Ch 1 Position GND Ch 2 Monitor D D SE XOUT AUX DB9 pin 1 AUX in ext big YOUT AUX DB9 2 APIP aaie hea OFF 4 x Front End XYGND DE3 pin 3 Arm plifier Filter RF Source e g 2 856 GHz 20 dBm If you have a 19 chassis BPM RFC X use the following set up To button inputs back of chassis XOUT AUX DBS pin 1 YOUT AUX DB9 pin 2 XYGND DBS pin 3 Oscilloscope Ch Ch 2 E chs Ch 4 Ext trig e g 2 856 GHz 20 dBm splitter BERGOZ Instrumentation S band Beam Position Monitor 0
7. Dr o DI JUU colis Vong pimai aii i Oat Dal S O00 00002 DL modo Don 00 b Le SC 00 Ta Up 000 Oo LY d agg gi 7 nG U og Oo EH D a Hi Se ee leg Up U U S band Beam Position Monitor BERGOZ Instrumentation Version 2 4 User s manual 01630 Saint Genis Pouilly France info bergoz com Page 6 e EN WISS Ga G Cr CO o Oo D D
8. 400 Om 1 Start 55 dem CW 2 998 GHz Stop 10 dem MEME 2011 03 29 09 11 Usefull dynamic range about 52 dB The plot above shows the dynamic range of S BPM with 11 meter long input cables The 4 cables used attenuate 100dB 100m at 3 GHz Huber Suhner GX03272 A subjective evaluation would indicate a useful dynamic range of 52dB from Marker 1 to Marker 2 Operating limits with 11 meter cables 50 dBm to 0 dBm after adding 7dB to the markers value in consideration of the 4 way inductive splitter insertion loss Note 50 dBm is approximately the signal collected by a BPM electrode whose subtending angle is 45 degrees passed by a 100 uA CW beam BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 28 User s manual QUICK CHECK S BPM in Track Continuous Mode Cont d Reaction Time to Beam Position Change S BPM can be used for fast interlock machine protection systems Time delay from a beam position change to Output signal half height rise is 45 ns Output risetime is 30 ns Signal shown is taken from an S BPM at 3GHz File Vertical Timebase Trigger Display Cursors Measure Math Analysis Utilities Help Signal Amplitude change on input A Input signal A Fp Mi vi A 500 mV div 10 0 mV div LATTES 20 0 ns divk Stop 730 mV 504 8 mV 20 20 mV ofst available 500 S 2 5 GS s J Edge Negative 2
9. Bergoz Instrumentation Espace Allondon Ouest 01630 Saint Genis Pouilly France Tel 33 450 426 642 Fax 33 450 426 643 Instrumentation S band Beam Position Monitor User s Manual Includes Processing modes Auxiliary options Accessories Rev 2 4 Sample amp Hold Track amp Hold Track Continuous Beam Trigger built in Sum of log Output Direct log A B C D outputs Filter amplifier Front end Japan REPIC Corporation 28 3 Kita Otsuka 1 Chome Toshima ku Tokyo 170 0004 Tel 03 3918 5326 Fax 03 3918 5712 U S A GMW Associates 955 Industrial Road San Carlos CA 94070 Tel 650 802 8292 Fax 650 802 8298 BERGOZ Instrumentation 01630 Saint Genis Pouilly France Tel 33 450 426 642 Fax 33 450 426 643 bergoz bergoz com http www bergoz com Registre des M tiers Bourg en Bresse Registre des ing nieurs Zurich TVA VAT IVA USt N FR88414997130 S rl capital 152K Siren 414 997 130 R C S Bourg APE 2651B Record of updates Version 1 0 1 4 2 0 2 1 2 2 2 3 2 4 Release date December 8 2008 Initial version derived from LR BPM User s Manual v 2 2 1 S BPM 111 3 1 January 16 2009 Layout change February 18 2010 Layout change S BPM CONNECTORS PINS ALLOCATION change March 09 2010 T amp H S amp H Timing change T amp H S amp H graphs added p 44 TRG IN AUX negative edge correction p xx Pin AlloCATION corr
10. D logD Trigger LPF BPF gt a gt BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 43 User s manual AGREEMENT ON AXES amp SIGNS X Y User s orthogonal axes U V S BPM pickup axes AC and BD ROTATED PICKUPS ORTHOGONAL PICKUPS B 0 General case a may be Z 2 2 a n 2 Note S BPM is factory set for B 0 equal X and Y gains i e a x 2 U Lg A C U Lge A C V Lg B D Signals of positive polarity V Lg B D Signals of positive polarity X Kx U V cos H X Kx V Y Ky U V sin B Y Ky U U Lg A C ROT ORTH ROT ORTH Jumper For details on pickup sensitivity and log ratio consult Log ratio Signal Processing Technique for Beam Position Monitors Robert E Shafer Proceedings of the Fourth Accelerator Instrumentation Workshop Berkeley 1992 AIP Conf Proceedings No 281 pages 120 128 BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 44 User s manual SIGNALS Input signals BUTA Pickup inputs A B C and D Impedance 50Q BUTB See Agreement on Axes amp Signs BUTC this manual for pickup assignments BUTD Output signals for ADC XOUT X displacement Bipolar signal up to 2V 0 Volt represents pickup center Output impedance 100 Q YOUT Y displacement Bipolar signal up to 2V 0 Volt represents pickup center Output impedance 100 Q XGND Analog
11. e g Buttons 6 dB corresponds to beam displacement equal to 1 6 of BPM pickup radius As the beam goes far off center this sensitivity becomes lower due to the algorithm X Log A C Please consider that the pickup sensitivity becomes higher as the beam goes off center and one non linearity tends to compensate the other Before simulating a beam displacement write down the XOUT and YOUT zero offsets using four equal attenuators Macropulse 0P LCA Generator com Then simulate the displacement by removing an attenuator from one input and inserting it in the opposite input A lt gt C and B lt D Example Macropulse orc Generator MO T Attenuator C is removed from input C and added to input A thus simulating a displacement of the beam towards C stronger signal on C pickup S BPM modules are factory preset e For orthogonally placed pickups A up B left C down and D right or e For rotated pickups A upper right B upper left C lower left and D lower right The combinations on the following table can be tried yielding the X and Y values listed Please note these are displacements Take into consideration the zero offsets due to power splitter imbalance and attenuators inequality BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 24 User s manual QUICK CHECK S BPM in Track Continuous Mode Cont d Beam displacemen
12. source output power Also refer to DYNAMIC RANGE chapter BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 21 User s manual QUICK CHECK Track Continuous Mode For macropulse beam If the RF power source can be gated apply a gate to the RF source to simulate macropulses Apply the same gate signal to the oscilloscope trigger input Setup Zf you have the table top test kit BPM KIT use the following set up S BPM Beam 15 Oscilloscope Ch 1 Position GND Ch 2 Monitor BD Ch 3 XOUT AUX DB9 pin 1 Ch4 YOUT AUX DBS pin 2 KA Ina XYGND DB9pin3 AFP OFF 4 xFront End SE Arn plifier Filter Pulse generator RF Source e g 2 856 GHz 20 dBm 8 9 5 us 1kHz If you have a 19 chassis BPM RFC X use the following set up To button inputs back of chassis XOUT AUX DB pin 1 YOUT AUX DB9 pin 2 aioe XYGND DB9 pin 3 a DUU Oscilloscope Ch 1 f Ch 2 Ch 3 Ch 4 Ext trig Pulse generator 8 9 5 us e g 2 856 GHz 1kHz 20 dBm BERGOZ Instrumentation 01630 Saint Genis Pouilly France info bergoz com S band Beam Position Monitor Version 2 4 Page 22 User s manual QUICK CHECK Track Continuous Mode For macropulse beam Cont d The Gate duration is set to 5 us The gating frequency is set to 1 kHz Try faster gating frequency The macropulse repetition rate can be
13. 040 k LeCroy 12 03 2012 12 28 14 Example from Orthogonal pickups configuration BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 29 User s manual QUICK CHECK S BPM in Sample amp Hold Mode This Quick Check works only if Sample amp Hold S BPM SH option is installed Unless otherwise specified on the Certificate of Calibration S BPM with Sample amp Hold option has following ex factory settings Orthogonal pickups Built in Beam Trigger Mode Timing and Processing S amp H Built in trigger Disabled ADC Trigger output Positive edge S BPM in Sample amp Hold Mode can measure macropulse beams or single pulse beam Quick Check setups for both types of beams are given hereafter e QUICK CHECK Sample amp Hold Mode for macropulse beam e QUICK CHECK Sample amp Hold Mode for single pulse beam For macropulse beam Setup to check immediately that your S BPM system is working in Sample amp Hold Mode If you have the table top test kit BPM KIT use the following set up TG AUX 5 EPM Beam Oscilloscope Ch 1 Position Ch 2 Monitor Ch 3 XOUT AUX DB9 pin 1 Ch4 YOUT AUX D nn __ sg Ext trig Ah DB3 pin 3 AB ERP se hes OFF 4 x Front End Arn plifiert Filter RF Source Power splitter Pulse generator e g 5 us 1kHz e g 2 856 GHz 20 dBm Note The cable to TRG IN AUX must be same length as
14. 100 mV ofst 397 6 mV 10 0 KS 10 GS s Edge Positive by 3 5 mV Ay 1 8 mV Ay 712 mV LeCroy 01 04 2011 10 21 01 Trailing edge of TRG ADC OUT occurs about 400ns after TRG IN AUX was applied to S BPM XOUT and YOUT are good to read by ADC after TRG ADC OUT trailing edge Note that TRG ADC OUT polarity can be inverted See TRG ADC OUT polarity switch p 12 BERGOZ Instrumentation 01630 Saint Genis Pouilly France info bergoz com Page 35 S band Beam Position Monitor Version 2 4 User s manual QUICK CHECK Sample amp Hold Mode for macropulse beam Cont d Resolution With same setup as above observe the noise on XOUT or YOUT output Set the oscilloscope persistence ON say 10 seconds persistence File Vertical Timebase Trigger Display 3GHz input S marcopulse TRG ADC OUT for ADC triggering XOUT SCH Measure P1 pkpk C3 value 15 mV 1 9 mV status Ca a P2 sdev C3 P3 mean C3 356 8 mV wi 50 0 mV div 1 00 Vidiv 50 0 mV div 163 0 mV ofst 720 mV offset 197 7 mV ofst LeCroy P4 area F3 Cursors Measure Math Analysis Utilities Help Measurements window PS ampl F1 P6 rise M2 P7 rise lv M2 P8 rise C2 200 ns div Auto 580 mV 20 0 kS 10 GS s Edge Positive 01 04 2011 11 35 16 Sdev C3 is the rms noise or resolution of XOUT measured in the measurements window when the output signals are good to read macropulses over a 10 second period The trace thickness
15. ground for XOUT YGND Analog ground for YOUT SUM OUT LogA LogB LogC LogD signal Signal range 0 2V Output impedance 100 Q TRG ADC OUT Trigger for external ADC TTL pos neg Edge See QUICK CHECK Sample amp Hold Mode and Track amp Hold Mode Output Impedance 100 Q SUM amp TRG GND Ground for SUM OUT and TRG ADC OUT VPHOUT Phase angle output 9V 90 RF to Phase reference angle S BPM with BPPM option only not available at time of writing Auxiliary Output Signals XOUT AUX Same as XOUT but 50 Q output impedance YOUT AUX Same as YOUT but 50 Q output impedance XYGND Analog ground for XOUT AUX and YOUT AUX BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 45 User s manual SIGNALS Cont d External Trigger Input and Trigger Gate TRG IN AUX Input for external trigger 50 Q positive edge gt 0 4 V TRG GATE Input for gating the beam trigger TTL High Low High High state inhibits Built in Beam Trigger Low state default state allows Built in Beam Trigger SUM amp TRG GND Ground for TRG IN AUX and TRG GATE Optional Output Wideband Signals Note These optional output signals are made available to compute beam position when the algorithm implemented in the S BPM circuit i e Log A C is unsuitable This can be the case of 6 button BPM pickups or asymmetric geometry of pickup electrodes LOGA Logarithmic representation of BUTA i
16. i 1 945 k X1 407 3ns AX 405 6 ns X2 17ns 1 AX 2 4655 MHz maas lt 2 50 0 mV div 1 00 Vidiv 100 mV div 100ns div Normal 620 mV 147 0 mV ofst 100 mV ofst 397 6 mV 10 0 kS 10 GS s Edge Positive Ay 3 5 mV Ay 1 8 mV Ay 712 mV LeCroy 01 04 2011 10 21 01 Trailing edge of TRG ADC OUT occurs about 400ns from the time when TRG IN AUX was applied to S BPM XOUT and YOUT are good to read by ADC at the time of TRG ADC OUT trailing edge Note that TRG ADC OUT polarity can be inverted The timing is explained in more details in QUICK CHECK S BPM in Sample amp Hold Mode Timing for macropulse beam p 33 Version 2 4 User s manual S band Beam Position Monitor Page 17 BERGOZ Instrumentation 01630 Saint Genis Pouilly France info bergoz com Legal E3 LS ovo ES C3 es CH D CD mi U UU T
17. is the noise of all successive To translate this rms voltage noise in beam position resolution let s assume a 25mm vacuum chamber radius and pickup electrodes width lt vacuum chamber radius In this case a beam displacement by 1 6 of the pickup radius equals to 347mV Hence in the example above resolution 1 9 mVrms 45 micrometers rms BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 36 User s manual QUICK CHECK Sample amp Hold Mode Cont d For single pulse beam This Quick Check works only if Sample amp Hold S BPM SH option is installed Unless otherwise specified on the Certificate of Calibration S BPM with Sample amp Hold option has following ex factory settings e Orthogonal pickups Built in Beam Trigger Mode Timing and Processing S amp H Built in trigger Disabled ADC Trigger output Positive edge Setup to check your S BPM working in Sample amp Hold Mode with single pulses If you have the table top test kit BPM KIT use the following set up Oscilloscope Ch 1 S BPM Ch 2 Beam Ch 3 i Position Ch 4 Monitor E trig XOUT AUX DB9 pin 1 YOUT AUX DB pin 2 XYGND DB9 pin 3 BLIP Site es FF 4 x Front End Amplifier Filter Fast pulse generator OUT Power splitter Trigger Out Note The cable to TRG IN AUX must be same length as input cables to compensate delay If you have a 1
18. make copies only for my own use I will inform others who need these schematics that they should request them from Bergoz Instrumentation Signed Sons ACKNOWLEDGEMENTS The fundamental principles of our Log ratio BPM module were developed by Robert E Shafer We sincerely thank him for his considerable contribution Our S BPM module was developed by Sebastien Artinian based on the earlier LR BPM design of Alexander Kalinin Saint Genis Pouilly December 2008 Last revised April 2011 S band Beam Position Monitor User s Manual
19. very high The following screen shot does not show the macropulse It shows the S BPM output signals XOUT and YOUT Observe high amplitude output noise on XOUT and YOUT before and after the 5 us macropulse This high noise is caused by the amplifiers going into high gain when there is no input signal XOUT signal from either Front Panel DB9 pin 1 or BPM KIT XOUT BNC YOUT signal from either Front Panel DB9 pin 1 or BPM KIT YOUT BNC Note Observe XOUT signals is shifted to above 347mV due to the 6dB attenuator in input A Observe high noise before and after macropulse due to amplifiers going to highest gain when there is no input 1 ps 200m D l ys 20m DC DC VE NN lt lt lt lt EA EA DC leCroy f T mean 1 357 Tm mean 4 5m 50 MS s _J 4 00 1 62 v NORMAL BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 23 User s manual QUICK CHECK S BPM in Track Continuous Mode Cont d Simulating beam position changes To simulate beam position changes the input signal power is changed by 6 dB 10 dB and 14 dB hence simulating position changes up to 1 3 of BPM pickup radius The S BPM on center sensitivity is factory set to 55 5 mV per dB of signal difference between opposite pickups For pickups with small subtending angle
20. will not be responsible for such discrepancies WARRANTY Bergoz Instrumentation warrants its beam monitors to operate within specifications under normal use for a period of 12 months from the date of shipment Spares repairs and replacement parts are warranted for 90 days Products not manufactured by Bergoz Instrumentation are covered solely by the warranty of the original manufacturer In exercising this warranty Bergoz Instrumentation will repair or at its option replace any product returned to Bergoz Instrumentation or its distributor within the warranty period provided that the warrantor s examination discloses that the product is defective due to workmanship or materials and that the defect has not been caused by misuse neglect accident or abnormal conditions or operations Damages caused by ionizing radiations are specifically excluded from the warranty Bergoz Instrumentation and its local distributors shall not be responsible for any consequential incidental or special damages ASSISTANCE Assistance in installation use or calibration of Bergoz Instrumentation beam monitors is available from Bergoz Instrumentation 01630 Saint Genis Pouilly France It is recommended to send a detailed description of the problem by e mail SERVICE PROCEDURE Products requiring maintenance should be returned to Bergoz Instrumentation or its distributor Bergoz Instrumentation will repair or replace any product under warranty at no charge The
21. 1630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 19 User s manual QUICK CHECK Track Continuous Mode for CW beam Cont d To display X and Y signals use an oscilloscope Attach the equipment together as shown above Oscilloscope setup Time base 1 us div CH1 0 2 V div DC 1 Mohm XOUT CH2 0 2 V div DC 1 Mohm YOUT Trigger free running Set the RF source to the S BPM operating frequency E g Set to 2856 MHz to test S BPM 2856MHz Amplitude about 20 dBm Please note that signals applied to S FEFA inputs will be attenuated by the 4 way splitter Inductive type 4 way splitters typically attenuate by 7dB 4 way resistive splitters or cascaded 2 way splitters attenuate by 12dB Connect Test Kit to DC supply or BPM RFC chassis to AC mains the oscilloscope will display X and Y values XOUT signal from il either Front Panel 1 ps DB9 pin 1 or 200m BPM KIT XOUT BNC YOUT signal from 2 pe T either Front Panel 200 m re L DB9 pin 1 or T BPM KIT YOUT BNC T LeCroy Note XOUT and YOUT signals overlap T Observe RMS signal noise sdev mean 3 0my sdev mean 2 9 my sdev 1 ps J 2 v pm 2 2 V DC 50 MS s 3 10 mv DC CF 3 LFREJ 9 8mV 4 20 mV DC AUTO If the RF signals applied to all four S FEFA inputs were exactly equal and if the S FEFA and S BPM modules were perfect the XOUT and YOUT voltages would be exactly 0 Volt This is gene
22. 9 chassis BPM RFC X use the set up on next page BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 37 User s manual QUICK CHECK Sample amp Hold Mode for single pulse beam Cont d If you have a 19 chassis BPM RFC X use the following set up TRG JN ALIX on rear panel DB 15 To button inputs THG JN AUX DB15 pin 2 back of chassis XOUT AUX DB pin 1 SUM amp TRG GND DB15 pin 4 YOUT AUX DB pin 2 XYGND DB9 pin 3 Hh IH SRE EIRE HoH Ch 2 te Ch 3 Ex trig L TAG ADC OUT from rear 4 x Front End mplifier Filter IDB15 T H H hie i Fast pulse generator TRG ADC OUT DB15 pin 5 XIYGND DB15 pins 6 or 15 Power Trigger Out OUT splitter Oscilloscope Ch 1 Note The cable to TRG IN AUX must be same length as input cables to compensate delay Set the Fast Pulse Generator to e lt 160ps risetime s 50V e Slow repetition rate e g 1 kHz Please note that signals applied to S BPM inputs are attenuated by the 4 way splitter Inductive type 4 way splitters typically attenuate by 7dB 4 way resistive splitters or cascaded 2 way splitters attenuate by 12dB This 50V pulse after splitting in an inductive type 4 way splitter 7 dB is about equivalent to a 500 pC bunch seen by four pickups of 5 pf capacitance and subtending angle 45 degrees BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly Fr
23. CG SMA jack Ato D buttoninputs 4 per BPM station A ontop DEB 15 female BPM station output connector one per BPM station IEC male connector for AC mains BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 51 User s manual ACCESSORIES Cont d BPM Chassis BPM RFC X Outer dimensions Front view 37 5 57 1 37 5 Top view Waning 90 2 Leave dearanc at op and bottom to allow free air fow for convection cooling Allow 10W max heat cissipaton per module installed in chassis Leave dearance for connectors and cables Rear view 1325 441 lateral screw heads 6mm BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 52 User s manual SCHEMATICS amp BOARD LAYOUT Schematics and board layouts of our instruments remain the exclusive property of Bergoz Instrumentation at all times They are protected by the copyright laws Schematics and board layouts are not delivered with our instruments They can be obtained at the specific request of the instrument s user A request should be sent by fax worded in the following way To Bergoz Instrumentation From User s name I am a user of instrument type xxx xxx serial nr XXX XXX XXX XXX etc Please send me one copy of the corresponding schematics and board layout I will use it for the instrument s maintenance only I will
24. E de ee EE 35 For single pulse GT a Ee rene ne RSR Re ES 36 Simulating beam position changes 40 S BPM PRINCIPLE OF OPERATION nine 42 BLOCK DIAGRAM EE 42 AGREEMENT ON AXES A SIGNS opa E ENA EN ANNAA 43 SIGNALS enron r NE ERG AE EE ER T A EE E EA E AEG dede 44 S BPM CONNECTORS PINS ALLOCATION Rev 1 3 rennes 46 BPM CABLES LAYOUT INSTIALLATION see 47 Cable eT nine here ele dent este rendre ee ere at den et nl eee trans de 47 ACCESSORIES EE et ere EE te ne tte ten 48 Font End Filter Amplifier S FEFA siennes 48 Table top test kit BPM KIT rroen enei ere rm Ps Seed PE due es ONE deeg dant db 48 Card Extender BPMEXTD T 49 Power eene TEEN 50 BEM Chassis DEM Kb eege e Eeer EA eeh ews ent e e eege sues ces te tt 50 SCHEMATICS amp BOARD LAY OUT eet Seege eeneg EES nee N E 52 ACKNOWLEDGEMENTS re nn ne a ere tn te dE deich det de 52 BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 2 User s manual INITIAL INSPECTION WARRANTY ASSISTANCE INITIAL INSPECTION It is recommended that the shipment be inspected immediately upon delivery If it is damaged in any way contact Bergoz Instrumentation or your distributor The content of the shipment should be compared to the items listed on the invoice Any discrepancy should be notified to Bergoz Instrumentation or its distributor immediately Unless promptly notified Bergoz Instrumentation
25. ME H er GE te Ei S amp H or der Bree OUR GEL KN ca EECH EN CH ge EE H ZK mes GE e SCT EF GGH G B QE Hi 4 Su e EH DO ZA eof rap og pes H LR SU 1 ca CH ces SIE l B A TRG ADC OUT Edge ca H ZS M In S amp H Mode J TL ode UP DOWN UP Negative Positive Timing Hold Clock T In T amp H Mode UP DOWN UP DOWN T amp H S amp H DOWN Positive Negative S amp H or T amp H BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 14 User s manual TRACK amp HOLD MODE Con t In Track amp Hold Mode the output signals timing looks like this e Vertical Timebase Trigger Display Cursors Measure Math Analysis Utilities Help 3GHz input macropule TRG ADC OUT for Oscilloscope triggering a on falling edge 4 70 ns Good XOUT and YOUT signals 1 f XOUT imebase 10 ns Trigger me 50 0 mVidiv 1 00 Vidiv 200 mV div 50 0nsidiv Stop 640 mV 129 0 mV ofst 480 mV ofst 601 4 mV 5 00kS 10GSIsJEdge Pose 1 626 k Xi 845ns At 618ns X2 146 3ns 1 2X 16 18 MHz CHE Ay 682 mV J Ay 11 7 mV LeCroy 01 04 2011 09 22 01 Output signals XOUTand YOUT track the position given by A B C and D inputs with 5 MHz bandwidth With SMHz macropulse repetition rate the output signals looks like this 5 MHz repetition rate File Vertical Timebase Trigger Display Curso
26. UPPLY 8 15 V 8 15 V Common BUTA BUTB BUTC BUTD PHREF XOUT XGND YOUT YGND SUM OUT TRG ADC OUT XOUT AUX YOUT AUX XYGND TRG IN AUX TRG GATE SUM amp TRG GND LOGA LOGB LOGC LOGD RESERVED TRACK CONTINUOUS GND 15V 15V COM b2 DB b8 b11 b22 a15 a20 a18 a17 c20 b20 c19 b14 b19 b22 b25 b28 b31 a13 a14 c13 c15 c14 BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 47 User s manual BPM CABLES LAYOUT INSTALLATION Cable layout Cables electrical length must be equal within 1ns Yet unlike most BPM electronics the S BPM module does not require the input signals to be in phase It tolerates any phase change even 180 Unnecessary intermediate connectors should be avoided When Jor practical reasons patch panels must be used the cables on either side of the patch panel should be passed through tubular ferrite cores or even better nanocrystalline cores The four cables pertaining to the same BPM stations must be laid side by side Cables BPM chassis and modules should be kept away as much as possible from RF equipment klystrons cavities Connectors must be chosen carefully to match the cable used Connectors manufacturers instructions must be followed meticulously If cable layout is subcontracted subcontractors must be informed of the extreme reliability expe
27. ance Version 2 4 info bergoz com Page 38 User s manual QUICK CHECK Sample amp Hold Mode for single pulse beam Cont d Set the oscilloscope to Time base 100 ns div CH1 1 V div DC 50 ohms Beam Pulse CH2 1 V div DC 50 ohms TRG OUT CH3 0 1 V div DC 1 Mohm XOUT CH4 0 1 V div DC 1 Mohm YOUT External trigger from Fast Pulse Generator Note Some oscilloscopes External trigger delay is not long enough to view the signal on the oscilloscope screen When that is the case add a cable delay line to delay the Fast Pulse output until the signals appear on the oscilloscope screen 1 trou T Single Bunch lps SU 1 00 V a U PA GE e TRG ADC OUT P S W T y aalan for oscilloscope 2 T triggering 1 00 V XOUT 3 bris REA aad I 1 ps L 100 m T C OUT trailing s good to be read by ADC L ps T 100 mt T YOUT T 1 ps T From TRG ADC OUT trailing 1 1 V Son edge YOUT is good to be read 2 l V WU by ADC 2 GS s 3 1 V DC nn H Extia DC 1 18 v im J i v AC KZ H oFF 1 86 ps NORMAL Trailing edge of TRG ADC OUT occurs about 400ns from the time when TRG IN AUX was applied to S BPM With this setup TRG IN AUX is applied at the same time as the pulse XOUT and YOUT are good to read by ADC from the time of TRG ADC OUT trailing edge Note that TRG ADC OUT polarity can be inverted See TRG ADC OUT polarity switch p 12 BERGOZ Instrumentation S band Beam P
28. ce Version 2 4 info bergoz com Page 40 User s manual QUICK CHECK S BPM in Sample amp Hold Mode Cont d Simulating beam position changes To simulate beam position changes the input signal power is changed by 6 dB 10 dB and 14 dB hence simulating position changes up to 1 3 of vacuum chamber radius If an inductive type 4 way splitter is used the pulse generator output amplitude should be about 50V with risetime lt 160ps If a resistive type pickup is used 100V is required The S BPM on center sensitivity is factory set to 55 5 mV per dB of signal difference between opposite pickups For pickups with small angle e g Buttons 6 dB corresponds to beam displacement equal to 1 6 of vacuum chamber radius As the beam goes far off center this sensitivity becomes lower due to the algorithm X Log A C Please consider that the pickup sensitivity becomes higher as the beam goes off center and one non linearity tends to compensate the other Before simulating a beam displacement start by noting the X and Y zero offsets using four equal attenuators Fast Pulse Generator D CG0 T Then simulate the displacement by removing an attenuator from one input and inserting it in the opposite input A lt gt C and B lt D Example Fast Pulse Generator Dnm E Attenuator C is removed from input C and added to input A thus simulating a displacement of the beam towards C stronger signal on C pickup S BPM modules ar
29. cted from these cables All cables with connectors must be checked before installation with a network analyzer up to twice the operating frequency at least i e Up to 6 GHz for 3 GHz operating frequency BPM modules must be installed in an RF shielded chassis BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 48 User s manual ACCESSORIES Font End Filter Amplifier S FEFA The Front End Filter Amplifier S FEFA is tuned to the beam RF frequency The filter is a bandpass with very high Q factor thus narrow bandwidth Therefore an S FEFA cannot be used at another freqency than the frequency it is tuned to Every S FEFA is matched to one S BPM input channel A B C or D When BPM pickup cables BPM C XX are delivered by Bergoz Instrumentation they are matched to a specific S FEFA and S BPM input channel A B C or D S FEFA is powered from the S BPM module thru the coaxial cable Therefore no filter no attenuator can be inserted in the cable from S FEFA to S BPM Table top test kit BPM KIT The table top test kit BPM KIT is an accessory which can be used to test the following modules made by Bergoz Instruments e MX BPM multiplexed BPM earlier called simply BPM VF BPM multiplexed BPM for variable frequency ramped accelerators BB BPM Baseband BPM for medical ramped accelerators LR BPM log ratio BPM S BPM S band BPM BPM KIT currently d
30. d D inputs with DC to 10 MHz bandwidth BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 13 User s manual TRACK and HOLD MODE Set switches to Mode T amp H gt UP Processing T amp H gt UP Timing Hold Clock T amp H gt UP Timing Trigger Inhibition Trigger to avoid bad trigger during processing 200ns in T amp H mode gt UP Built in Beam Trigger as desired Disable for external trigger ADC Trigger Output Edge as desired ME Active switch Inactive switch E ieina S Built in Beam BL Dee Ch Trigger EH he Pes es UP DOWN Op os ILE TETE Enabled Disabled e eos CDD G R UD EH BE UB pas es Ve SE 88 Silleso os T H T LE Shes
31. d Trace 2 YOUT show the held X and Y positions of the macropulse XOUT signal from either Front Panel DB9 pin 1 or BPM KIT XOUT BNC YOUT signal from 1 either Front Panel 200 DB9 pin 1 or BPM KIT YOUT BNC Note Observe XOUT signals is shifted to above 347mV due to the 6dB attenuator in input A NN E Ku J ai FAE ys mi C C C il lps 200 mV DC DC DC DC LeCroy Version 2 4 User s manual Next macropulse starts here IN ang Sample amp Hold occu rs here 4 DC 1 62 V i T 50 MS s NORMAL BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 32 User s manual QUICK CHECK Sample amp Hold Mode for macropulse beam Cont d 36 Mar 11 10 52 07 1 leCroy 2 ms XOUT signal from 18 Om T either Front Panel T U DB9 pin 1 or L BPM KIT XOUT BNC Saa 18 Bai YOUT signal from either Front Panel DB9 pin 2 or BPM KIT YOUT BNC Haat Pott re OT EH nm Note T Observe the pkpk or sdev values pkpk 1 x lw for trace 1 and trace 2 sdev 1 1 75m pkpk 2 8 1mv sdev 2 1 76m 2 ms 1 10 mv DC 10 w DC 50 kS s 3 2 V OC EE 4 DC 0 60 V 4 1 V mm STOPPED Using the same setup observe the same signal on a slower oscilloscope time base The pkpk value i
32. dth 10 MHz Connectors 1 0 2 3 output connectors Note Mating connectors are not installed in chassis BPM RFC or BPM KIT Users of option S BPM ABCD must provide these connectors Refer to BPM MODULE REAR CONNECTOR See typical Lg A output from a single bunch on preceeding page timing diagram Note Accessories are described in chapter p 48 ACCESSORIES BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 11 User s manual ACCESS to JUMPERS and SWITCHES To access jumpers and switches remove the module shield To remove shield Remove screws 2 from underside S BPM modules can be inserted removed from their chassis or BPM KIT while the power is ON The S BPM module is equipped with many on board potentiometers to adjust the log amplifiers gain slope and intercept point They require precise instruments tools and procedures for their adjustment BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 12 User s manual TRACK CONTINUOUS MODE Set switches to Mode Track Continuous T gt DOWN Processing Track Continuous T gt UP Timing Inactive Built in Beam Trigger not available in this mode TRG ADC OUT Edge not available in this mode
33. e factory preset e For orthogonally placed pickups A up B left C down and D right or e For rotated pickups A upper right B upper left C lower left and D lower right The combinations on the following table can be tried yielding the X and Y values listed Please note these are displacements Take into consideration the zero offsets due to power splitter imbalance and attenuators inequality BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 41 User s manual QUICK CHECK S BPM in Sample amp Hold Mode Cont d Simulating beam position changes Cont d Table of X Y output voltage vs input power assuming the pickup subtending angle is infinitely small Input Attenuators Equivalent Orthogonal Rotated pickups Displacement pickups X 0 347 V X 0 347 V Y 0 347 V X 0 576 V Y 0V X 0 576 V Y 0 576 V X 0 806 V Please note these are displacements Take into consideration the zero offsets due to power splitter imbalance and attenuators inequality BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 42 User s manual S BPM PRINCIPLE OF OPERATION The signals from the pickup electrodes are processed simultaneously thru four independent channels Each channel consists of an input band pass filter followed by an amplification chain with logarithm
34. ection DB9 9 gt TRG ADC OUT April 01 2011 S BPM new release 111 3 2 Main changes S BPM layout change switch positions Track Continuous reptition rate up to 10MHZ instead of SMHz Sample amp Hold 400ns processing time instead of 470ns Sample amp Hold repetition rate 5KHz instead of 2MHz due to trigger inhibition SUMOUT positive value instead of negative TRG AUX_IN on rising edge gt 0 4V instead of negative gt 2V Ortho Rot jumpers positions as LR BPM Track Continuous traces Track amp Hold and Sample amp Hold traces Resolution improvements CONNECTORS PINS ALLOCATION Rev 1 2 TRG ADC OUT DB9 pin5 April 26 2011 p 43 Agreement on axes amp signs schematics and annotations corrections May 23 2011 Correction T T amp H S amp H mode switch position p 12 13 amp 15 March 12 2012 Reaction Time to Beam Position Change p 28 gt updated November 07 2013 CONNECTORS PINS ALLOCATION Rev 1 3 errors correction BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 1 User s manual SUMMARY INITIAL INSPECTION WARRANTY ASSISTANCE rennes 2 YOU JUST RECEIVED A BEAM POSITION MONITOR seen 3 Determine which S BPM model you received 5 Determine which options are installed onto S BPM 5 MODES OF OPERATION FOR VARIOUS BEAMS seep 7 Track Continuous T Mode ss 7 Sample amp Hold S a
35. elivered must be powered by a laboratory 15V power supply Yet older units have been delivered to users with 100 Vac 115 Vac and 220 230 Vac mains voltage Check AC mains voltage on power supply module before using The BPM KIT includes A DIN41612M 24 8 mating connector Four coaxial cables connected to the button inputs terminated by SMA plugs Eight BNC jacks to enter signals like triggers and view output signals Four DIP switches to simulate external control signals The BPM KIT is very convenient It allows the BPM module to be placed flat on the table In this position the shield can be removed and the user has access to all switches Jumpers filters and potentiometers BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 49 User s manual ACCESSORIES Cont d Card Extender BPM XTD The card extender allows access to the BPM module adjustments while it is connected to the chassis thus to the readout and control system The BPM XTD is not as convenient as the BPM KIT for adjustments The coaxial connections extensions of the button signals cause an offset of the X and Y outputs when the extender is used This is due to the difference in signal attenuation between the 4 extension cables These differences are recorded on a label affixed to the extender The RF Service module BPM SERV RF can be inserted in a BPM station of a chassis in place of the BPM
36. ic response When a single short pulse is applied to the band pass filter it will oscillate at its own resonant frequency for about 250 ns allowing enough time for the logarithmic amplifier to detect the log of its envelope Each amplifying chain produces a signal which peak amplitude is proportional to the log of the input signal be it a single pulse a pulse train or a continuous wave Log signals from opposite pickup electrodes are deducted from one another to obtain Log A Log C Log A C which is said to be a very faithful representation of beam displacement between two pickup electrodes If the pickup electrodes are placed along the axes in which the beam displacement is to be measured the displacement X Kx Log A C directly The Kx gain is obtained by an amplifier with adjustable gain The same goes for the Y axis If the pickup electrodes are placed along axes rotated as compared to the beam position measurement axes the A C and B D axes must be rotated to obtain the beam displacement values along X and Y The rotation is done wideband with gt 5 MHz response applying the algorithm hereafter Schematic representation of the log ratio BPM an original concept of Robert E Shafer Y V ky log A B ky log A log B kyr BLOCK DIAGRAM A LPF BPF gt gt a Be LogA logC E C uer BPF D D logC ait Axes Sum of logs rotation g if pickups B logB LPF BPE gt gt are rotated al K E LogB logD
37. ies Help Blue XOUT signal from either Front Panel G DB9 pin 1 or BPM KIT XOUT BNC r d l XOUT Standard deviation AA Yellow distribution Er Measure Pt sdev C3 P2 mean C3 P3 sdev F2 P4 top F1 P5 max F3 P6 max F4 P7 rise lv M2 P8 rise C2 value 1 55 mV status La imebase 0 00 ps 5 00 mVidiv ai 100ys div Single 14 15 mV 6 36 mV ofst 50 0 pV div 100 kS 10 GS s Edge Positive A Trailing number s in the filename were truncated to allow auto numbering Waiting for Tage The noise is about 1 6mVrms To translate this rms voltage noise in beam position resolution let s assume a 25mm vacuum chamber radius and pickup electrodes width lt vacuum chamber radius In this case a beam displacement by 1 6 of the pickup radius equals to 347mV Hence in the example above 1 6 mVrms 24 micrometers rms BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 26 User s manual QUICK CHECK S BPM in Track Continuous Mode Cont d Dynamic range Observe S BPM dynamic range with a vector network analyser VNA The measurements hereafter require a VNA equipped with an Auxiliary DC input usually placed at the rear Some known models to feature such a DC auxiliary input are Agilent 8357D E and ES Agilent 5071C Setup If you have the table top test kit BPM KIT use the following set up XOUT is connectedto YNA rear panel Aux
38. iliary DC input S BPM Network Analyser XOUT Beam 15 Position CNR Monitor 4 x Front End Arn plifiert Filter AB BP RCA AS OFF XOUT AUX DBS pin 1 XY GND DB pin 3 Power splitter If you have a 19 chassis BPM RFC X use the following set up To button inputs back of chassis Metwork Analyser HOUT AUX DBS pin 1 XYGND DBS pin 3 Tx RX XOUT is connected Lo YMA rear panel Ausdiary DC input Power splitter BERGOZ Instrumentation 01630 Saint Genis Pouilly France info bergoz com Page 27 S band Beam Position Monitor Version 2 4 User s manual QUICK CHECK S BPM in Track Continuous Mode Cont d Dynamic range Cont d Set the VNA in power sweep mode over the widest possible range To cover the full S BPM dynamic range the VNA must be capable of gt 50dB power sweep Successive power sweeps may be needed if the VNA has a more limited sweep range Perform several sweeps with various input attenuators combinations in such a way that X and Y off center linearity is tested Explore the range from 7 dBm down to 70 dBm Remember that 4 way inductive type splitters absorb typically 7 dB and resistive splitters absorb 12 dB LEE Network Analyzer 1 Active Ch Trace 2Response 3Stimulus 4Mkr Analysis 5 Instr State N Tr2 AUS 1ovi 33 Real 100 0mu Ref 0 000U m r3 A e M M 1 20 000 dem 158 97 mu nn lt
39. illation monitoring in boosters and storage rings e Cyclotrons microtrons e Ion and proton synchrotrons with frev gt 1 MHz Note Track amp Hold can also be used up to 5 MHz frev Macropule beams e Linacs with micropulse RF structure up to 3 GHz e Transfer lines with micropulse RF structure up to 3 GHz e Cyclotrons microtrons The Track Continuous mode is NOT suitable for single bunch beams i e Beams of short pulses at low repetition rate E g pulses at 10 Hz repetition rate To measure these beams the Sample amp Hold mode must be used Refer to Sample amp Hold Mode chapter p 15 for switch settings BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 8 User s manual MODES OF OPERATION FOR VARIOUS BEAMS Cont d Sample amp Hold S amp H Mode Requires Sample amp Hold option S BPM SH to be mounted on the printed circuit board Processing time 400 ns Hold time Up to 100 ms ADC measurement time At maximum repetion rate at least 100 ns good signal Repetition rate Limited to 5kHz by on board trigger inhibition Note that T amp H Mode can be used up to 5 MHz when the pulse or macropulse repetition rate is higher than 1 MHz Linacs single bunch macropulses bunch trains Transfer lines single bunch macropulses bunch trains Synchrotron first turn Synchrotron single bunch turn by turn Synchrotron multi single bunch turn by turn
40. includes Description S band BPM electronics module Sample amp Hold on X and Y option Beam Trigger option Sum of logs option Direct A B C D wideband outputs option Order code S BPM X XXXGHz S BPM SH S BPM TRG S BPM SUM S BPM ABCD The options are factory installed onto the S BPM electronics module Accessories e Filter Amplifer Front end 1 channel e 19 chassis with power supply e Table top test kit e 3U Card extender with coaxial contacts e RF service module with four front panel BNC S FEFA X XXXGHz BPM RFC X X number of BPM stations BPM KIT BPM XTD BPM SERV RF BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 4 User s manual YOU JUST RECEIVED A BEAM POSITION MONITOR Check that the Table top Kit power supply voltage corresponds to your mains voltage On some table top kit BPM KIT older models an AC DC power supply block is installed Its AC input voltage range is indicated on the power supply block If it does not correspond to your AC mains use a transformer or contact the manufacturer to get another power supply In the 19 chassis BPM RFC The power supply is autoranging from 98V 264V Check the fuse configuration that it corresponds to your national regulations The table top test kit does not have any fuse The 19 BPM RFC chassis fuse compartment is configured at the time of shipment according to its de
41. ing between modes In principle the Mode of Operation is set by the on board switches permanently Yet it is possible during operation to switch to Track Continuous Mode to ease the timing adjustment of an external trigger The control line TRACK CONTINUOUS pull down is available on the front panel DB9 pin 7 BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 10 User s manual OPTIONS In addition to the Sample amp Hold option described in the preceeding chapter other options are available Built in Beam Trigger S BPM TRG option Requires Built in Beam Trigger option S BPM TRG to be mounted on the printed circuit board Particle polarity S BPM operates with positive and negative particle polarity Minimum detected charge 100 pC bunch seen by four pickups of 5 pF capacitance and width 1 8 of circumference Maximum repetition rate 5 MHz Sum of logs Output S BPM SUM option Requires Sum of Logs option S BPM SUM to be mounted on the printed circuit board Value SUM Lg A Lg B Lg C Lg D Bandwidth 10 MHz Note When the beam is on center of the BPM pickup Lg A Lg B Lg C Lg D thus SUM is proportional to Lg beam current Direct log outputs for A B C and D S BPM ABCD option Requires Direct A B C D Outputs option S BPM ABCD to be mounted on the printed circuit board Outputs Log A Log B Log C and Log D Bandwi
42. input cables to compensate delay Ifyou have a 19 chassis BPM RFC X use the set up on next page BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 30 User s manual QUICK CHECK Sample amp Hold Mode for macropulse beam Cont d If you have a 19 chassis BPM RFC X use the following set up TAG JN ALIX on rear panel DB 15 TRG IN AUX DB15 pin 2 SUM amp TRG GND DB15 pin 4 To button inputs TEGIN AUX back of chassis XOUT AUX DB9 pin 1 YOUT AUX DB9 pin 2 XYGND DES pin 3 Oscilloscope Ch 1 Ch 2 chs Ch 4 Ext trig Pulse generator e g 5us 1kHz e g 2 856 GHz 20 dBm Power splitter Set the RF source to e Gated mode e The S BPM operating frequency e g 2856 MHz e 20dBm output power Set the Gating pulse generator to e 3 us pulse duration e Slow repetition rate e g 500 Hz Note Some oscilloscopes External trigger delay is not long enough to view the signal on the oscilloscope screen When that is the case add a cable delay line to delay the Gate of the RF source until the gated pulse is in the screen BERGOZ Instrumentation 01630 Saint Genis Pouilly France info bergoz com S band Beam Position Monitor Page 31 QUICK CHECK Sample amp Hold Mode for macropulse beam Cont d Insert an attenuator in one of the inputs e g 6 dB in Input A Trace 1 XOUT an
43. module It brings to the front panel on SMA jacks the four signals applied to this BPM station by the BPM buttons For oscilloscope and spectrum analyzer viewing of the BPM button signals Very useful because the RF cables at the rear of the chassis are too crowded to be disconnected BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 50 User s manual ACCESSORIES Cont d Power Supply module AC mains voltage Autoranging 98 132Vac and 185 265Vac Power derating No derating down to 85 Vac at full chassis load Output 15 V unequal loading tolerant Power 75 W Efficiency 84 at 220Vac 81 at 110 Vac Inrush current limited to 10A max Dimensions per DIN41494 3U high 8F wide 160mm deep Manufacturer Delta Elektronika BV the Netherlands Model 75 SX 15 15 BPM Chassis BPM RFC X The BPM RFC X chassis is built around a 19 Schroff rackable RF chassis Dimensions of the bin 3U x 84F Schroff reference Europac Lab HF RF 20845 283 The BPM RFC X is available equipped for 1 up to 16 BPM stations X being the number of stations BPM RFC X with less than 16 stations are partially equipped BPM RFC 16 As a result all BPM chassis are field upgradable to the full 16 station chassis Chassis rear view DB9 male Extemal commands input connector Common to all stations SMA jack RF input fortest station O O O O o 0 O OO O o O roy fey pay
44. mp H Mode 8 Track amp Hold R 2 RHO ls tes nn te E LA eR AR 8 Tiger sienne Pirate eee lee re nent en rte ten rende Te Case tes 9 Switching between modes nets di menti nent indiennes ter a te rent val 9 OPTIONS nr SEA ta eee EE EE 10 Built in Beam Trigger S BPM TRG option 10 Sum of logs Output S BPM SUM option 10 Direct log outputs for A B C and D S BPM ABCD option 10 ACCESS to JUMPERS ands WITCHES en nn nn intenses 11 TRACK CONTINUOUS MODE Neie 12 TRACK md HOLD MODNE e rarte a E shaven ds codeseavantenepden EE Eet cie 13 TRACK amp HOED MODE COn ann mette E intense nt reins dt 14 SAMPLE amp HOLD MODE seen attenante antennes 15 CHANGING PICKUP CONFIGURATION coiii aiei natsa nnana s aai e iai aaa ie ii a ai iS 17 Orthogonal pickups position of jumpers ss 17 Rotated pickups position of jumpers 17 QUICK CHECK S BPM in Track Continuous Mode 18 FOR ee 18 B amdisplacement ss sig ak eee eas th HARES EE ls AR le nest 20 Dynamic TEE 20 For macropuls beam antenne NEEN SEENEN EENS 21 Simulating beam position changes 23 ReSOlUH OD gear etre ag tte nn Mere en nn tenet nee 25 IR HE 26 Reaction Time to Beam Position Change 28 QUICK CHECK S BPM in Sample amp Hold Mode 29 Formacropuls T ne en E Ses ew de rater ea ees eee 29 Timing for macropulse beam see 33 Resolution E
45. nput LOGB Logarithmic representation of BUTB input LOGC Logarithmic representation of BUTC input LOGD Logarithmic representation of BUTD input External Controls TRACK CONTINUOUS TTL signal To set Track Continuous mode High state default sets Track amp Hold mode Pull down for Track Continuous mode Pullup resistor to SV is 4K7 GND Ground for above signals Common external controls Common external controls are common to all BPM modules in a BPM chassis None are handled by S BPM BERGOZ Instrumentation 01630 Saint Genis Pouilly France info bergoz com S band Beam Position Monitor Page 46 S BPM CONNECTORS PINS ALLOCATION Rev 1 3 Version 2 4 User s manual DIN41612M S BPM module rear connector DB9 female connector on S BPM front panel INPUT SIGNALS Input A Input B Input C Input D Phase reference BPPM option only coaxial insert 1 0 2 3 type OUTPUT SIGNALS FOR ADC X output Analog ground Y output Analog ground Log A B C D output ADC Trigger TTL output pos neg edge AUXILIARY OUTPUT SIGNALS X auxiliary output Y auxiliary output X and Y auxiliary outputs analog ground EXTERNAL TRIGGER INPUT AND TRIGGER GATE External trigger input pos edge Trigger inhibit gate Low High Low Default value High no inhibiting OPTIONAL OUTPUT SIGNALS Log A Log B Log C Log D Coaxial insert 1 0 2 3 type EXTERNAL CONTROLS Reserved Track Continuous mode Low GND POWER S
46. on inputs back of chassis Pulse generator RF Source Gate 8 9 5 us e g 2 856 GHz Power 1kHz 20 dBm splitter Ifyou have a 19 chassis BPM RFC X use the following set up Note The cable to TRG IN AUX must be same length as input cables to compensate delay BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 34 User s manual QUICK CHECK Timing in Sample amp Hold Mode for macropulse beam Cont d Observe the relative timing of e CH1 input macropulse e CH2 output trigger TRG ADC OUT for the ADC on rear panel DB15 or front panel DB9 pin 9 e CH3 X output XOUT Pulse generator setup e Gate duration 40ns e Gate frequency Slow e g 500 Hz Oscilloscope setup Time base 100 ns div CH 50 mV div DC 50 ohms S band input macropulse CH2 1 V div DC 50 ohms TRG ADC OUT to trigger ADC amp oscilloscope CH3 100 mV div DC 1 Mohm XOUT Trigger on CH2 TRG ADC OUT File Vertical Timebase Trigger Display Cursors Measure Math Analysis Utilities Help 3GHz input marcopulse ern TRG ADC OUT for ADC From TRG ADC OUT trailing triggering edge XOUT is good tobe read S E by ADC or ae XOUT Good value on XOUT 400ns 1 1 945 k X1 4073ns AX 4056ns X2 17ns 1 AX 2 4655 MHz 50 0 mV div 1 00 Vidiv 100 mV div 100ns div Normal 620 mV 147 0 mV ofst
47. osition Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 39 User s manual QUICK CHECK Sample amp Hold Mode for single pulse beam Cont d With same setup as above observe the noise on XOUT and YOUT outputs 1 Leroy 1 ps Single Pulse is V sh SES RE 182 sups 9 PRE TRG ADC OUT TN for oscilloscope i triggering 182 sups HH 1 ps XOUT BO mi 16 sups l ps YOUT gan alll 24 sups T K Good XOUT YOUT ignal 2 1 v signas 2 65 s 9 50 mV AC ll H Extia oc 1 10 V im 450 mv AC d k Hoff 1 86 ps NORMAL Set the oscilloscope persistence ON Observe the XOUT and YOUT trace thickness It is the peak peak dispersion or noise of all successive pulse position measurements during the oscilloscope persistence time On the plot above about 20 mVpp after TRG ADC OUT trailing edge when XOUT and YOUT are good to read The rms noise or resolution is about 3 2 times lower than the peak peak noise Le 6 25mVrms To translate this rms voltage noise in beam position resolution let s assume the BPM pickup aperture is 25mm and the pickup electrodes subtending angle is infinitely small In this case a beam displacement by 1 6 of the pickup radius equals to 347mV Hence in the example above resolution 6 25 mVrms 37 5 micrometers rms BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly Fran
48. purchaser is only responsible for transportation charges For products in need of repair after the warranty period the customer must provide a purchase order before repairs can be initiated Bergoz Instrumentation can issue fixed price quotations for most repairs However depending on the damage it may be necessary to return the equipment to Bergoz Instrumentation to assess the cost of repair RETURN PROCEDURE All products returned for repair should include a detailed description of the defect or failure and name of the user Contact Bergoz Instrumentation or your local distributor to determine where to return the product Returns must be notified by e mail prior to shipment Return should be made prepaid Bergoz Instrumentation will not accept freight collect shipment Shipment should be made via United Parcel Service DHL or Federal Express Within Europe the transportation service offered by the Post Offices EMS Chronopost Datapost etc can be used The delivery charges or customs clearance charges arising from the use of other carriers will be charged to the customer BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 3 User s manual YOU JUST RECEIVED A BEAM POSITION MONITOR This manual applies to the S band BPM only S BPM 111 3 2 Other models e g BPM MX BPM LR BPM VF BPM BB BPM BPM AFE are described in other manuals The S band BPM system
49. rally not the case X and Y will be many 10s of millivolts off To determine how much of this offset is caused by power splitter imbalance Instead of connecting S FEFA A to power splitter output 1 connect it to output 3 Do the same for S FEFA B and D with power splitter outputs 2 and 4 BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 20 User s manual QUICK CHECK Track Continuous Mode for CW beam Cont d The next tests consists of simulating beam displacements Insert a 6 dB attenuator at any power splitter output e g signal to A input The RF source output power should be in the range 10dBm 35 dBm XOUT signal from either Front Panel DB9 pin 1 or H a T BPM KIT XOUT BNC T YOUT signal from either Front Panel 2 i DE ps U DB9 pin 1 or 200 m Se ee ee ee ce ee rr BPM KIT YOUT BNC Note Observe XOUT signals is shifted to above 347mV due to the 6dB attenuator T in input A mean 1 353 5m4 mean 2 3 Bn lps J 2 v oc 7 2 V DG 50 MS s 10 m DC 3 LFREJ 9 8mV 4 20 mV OC AUTO Further tests can be performed Beam displacement e Simulating beam displacements along the X or Y axes or both with various attenuator values Refer to BEAM DISPLACEMENT chapter Dynamic range The dynamic range can be tested Simulate a higher or lower beam current by varying the RF
50. rs Measure Math Analysis Utilities Help 3GHz input macropule TRG ADC OUT for oscilloscope f triggering S i on falling edge XOUT 01 04 2011 09 21 13 Timebase _ 210ns Trigger ei 50 0 mVidiv 1 00 Vidiv 200 mV div 50 0 nsidiv Stop 640 mV 129 0 mV ofst 480 mV ofst 601 4 mV 5 00 kS LED GEI Positive 1 299 ke X1 838ns At 619ns X2 1457ns 1 2X 16 16 MHz Ay 0 0 mv Ay 792 mV Ay 149 mV LeCroy BERGOZ Instrumentation 01630 Saint Genis Pouilly France info bergoz com SAMPLE amp HOLD MODE Set switches to S band Beam Position Monitor Page 15 Mode Sample amp Hold gt UP Processing Sample amp Hold gt DOWN Timing Hold Clock Sample amp Hold gt DOWN Timing Trigger Inhibition Trigger to avoid bad trigger during processing 200us in S amp H mode gt DOWN Built in Beam Trigger As desired ADC Trigger Output Edge As desired Version 2 4 User s manual
51. s the macropulse to macropulse S BPM peak peak noise The sdev value is the macropulse to macropulse S BPM rms noise or resolution Observe sdev 1 the macropulse to macropulse S BPM rms noise or resolution of XOUT 1 8mVrms To translate this rms voltage noise in beam position noise let s assume a BPM pickup aperture of 25mm and pickup electrodes subtending angle infinitely small In this case a beam displacement by 1 6 of the pickup radius equals to 347mV Hence in the example above 1 8 mVrms 43 micrometers rms BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 33 User s manual QUICK CHECK Sample amp Hold Mode for macropulse beam Cont d Timing for macropulse beam If you have the table top test kit BPM KIT use the following set up TGH AU CH1 S BPM Beam Position TRG ADC OUT Monitor XOUT AUX DBS pin 1 TRG ADC OUT D pin 2 XYGND DB9pin3 ABP 45 Hau OFF Pulse generator RF Source e g 5 us e g 2 856 GHz 1kHz 20 dBrn splitter 4x Front End Amplifier Filter Note The cable to TRG IN AUX must be same length as input cables to compensate delay XOUT DB15 pind rear or XOUT AUX DB9 pin1 front TRGIN AUX on rear panel DB 15 TRG ADC OUT DB9 ping front TRG IN AUX DB15 pin 2 or DB15 pin5 SUM amp TRG GND DB15 pin4 XYGND DB9 pin3 or DB15 we pin6 15 To butt
52. stination e North America mains ground wire unused e All other destinations both mains wires are fused To verify which fuse configuration is installed on your chassis pull out the removable fuse block using a small screwdriver e The unfused ground configuration has a shorting bar and a 2A 6x32 fuse e The configuration with both AC lines fused is equipped with two 2A 5x20 fuses To change this configuration unscrew the fuse holder off the fuse block flip the holder over and screw it back onto the fuse block Insert the following fuses e For unfused ground configuration one 2A 6x32 fast fuse e For both AC lines fused configuration two 2A 5x20 fast fuses BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 5 User s manual YOU JUST RECEIVED A BEAM POSITION MONITOR Determine which S BPM model you received At the time of writing this User s Manual only one version has been shipped to users S BPM revision number 111 3 2 The circuit revision number 111 3 2 is engraved on the printed circuit board Determine which options are installed onto S BPM S BPM with option Sample amp Hold i e S BPM SH can be recognized by e The printed circuit is equipped with Track amp Hold Sample amp Hold circuits To remove the shield cover refer to Chapter ACCESS TO JUMPERS and SWITCHES Track amp Hold Sample amp Hold circuits
53. t Cont d Table of X Y output voltage vs input power assuming the pickup subtending angle is infinitely small Input Attenuators Equivalent Orthogonal Rotated pickups Displacement pickups X 0 347 V Y 0V X 0 347 V Y 0 347 V X 0 576 V Y 0V X 0 576 V Y 0 576 V X 0 806 V Y 0 570 V Y 0V Please note these are displacements Take into consideration the zero offsets due to power splitter imbalance and attenuators inequality Note The above voltages are representations of the algorithms For Orthogonal pickups X Kx Lg A C and Y Ky Lg B D For Rotated pickups X Kx Lg A C Lg B D cos B and Y Ky Lg A C Lg B D sin B Where B is the tilt angle of the pickup axes Refer to AGREEMENT on AXES and SIGNS p 43 Kx cos and Ky sin f are factory set to 1 1513 Volts Note This value was chosen because it corresponds to a difference over sum ratio equal to 1 for small amplitude displacements off center E g 0 001 V for 0 005 x R S band Beam Position Monitor BERGOZ Instrumentation 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 25 User s manual QUICK CHECK Track Continuous Mode Resolution The noise spectrum of XOUT or YOUT indicates the resolution attainable by S BPM Connect an oscilloscope to XOUT or YOUT Plot in histogram mode e g Lecroy SDA11000 File Vertical Timebase Trigger Display Cursors Measure Math Analysis Utilit
54. using trigger gate Refer to Sample amp Hold Mode chapter p 15 for switch settings Track amp Hold T amp H Mode Requires Sample amp Hold option S BPM SH to be mounted on the printed circuit board Processing time 60 ns Hold time 70 ns ADC measurement time At maximum repetion rate at least 50 ns good signal Repetition rate Up to 5 MHz Indicated whenever the single pulse or macropulse repetition rate is faster than 2 MHz Note that T amp H Mode cannot be used when the pulse or macropulse repetition rate is higher than 5 MHz Indicated for Linacs Synchrotron frev lt 5 MHz Single bunch turn by turn Synchrotron multi single bunch turn by turn using trigger gate Refer to Track amp Hold Mode chapter p 13 for switch settings BERGOZ Instrumentation S band Beam Position Monitor 01630 Saint Genis Pouilly France Version 2 4 info bergoz com Page 9 User s manual MODES OF OPERATION FOR VARIOUS BEAMS Cont d Triggering In Sample amp Hold S amp H and Track amp Hold T amp H modes S BPM must be triggered Triggering can be provided a by the built in Beam Trigger if installed on S BPM order code S BPM TRG To use the built in Beam Trigger it must be enabled by its switch See built in Beam Trigger switch p 12 b by an external signal applied to TRG IN AUX input To use the external trigger the built in trigger if installed must be disabled See built in Beam Trigger switch p 12 Switch
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