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Status & operational experience of Liberas at SSRF

Status & operational experience of Liberas at SSRF. Leng Yongbin, Yan Yingbing , Zhou Weimin, Chen Yongzhong Ye Kairong, Yuan Renxian, Zou Yi, Yu Luyang, Huang Guoqing BI Group, SSRF 2009-06-22. Outline. Introduction of SSRF SSRF BPM system Libera applications Tune monitor

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Status & operational experience of Liberas at SSRF

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  1. Status & operational experience of Liberas at SSRF Leng Yongbin, Yan Yingbing, Zhou Weimin, Chen Yongzhong Ye Kairong, Yuan Renxian, Zou Yi, Yu Luyang, Huang Guoqing BI Group, SSRF 2009-06-22

  2. Outline • Introduction of SSRF • SSRF BPM system • Libera applications • Tune monitor • Beam spectrum monitor • Beam current & charge measurement • BPM phase advance monitor Libera Workshop, ESRF, Jun 2009

  3. Shanghai Synchrotron Radiation Facility • Third generation light source • Total budget is about 130 millions EURO • Started @ 12/25/2004 and is open to user @ 5/1/2009 Libera Workshop, ESRF, Jun 2009

  4. SSRF complex Libera Workshop, ESRF, Jun 2009

  5. Libera based BPM system Libera Workshop, ESRF, Jun 2009

  6. Specification Libera Workshop, ESRF, Jun 2009

  7. BPM system overview Libera Workshop, ESRF, Jun 2009

  8. Ring pickup factory test DC isolation resistance Network analyzer S11 Mechanical inspection BPM block gauge Capacitance Leakage AC voltage break down Magnetic permeability Libera Workshop, ESRF, Jun 2009

  9. Ring pickup factory test Libera Workshop, ESRF, Jun 2009

  10. BPM cabling ID BPM Major cable TIMES LMR400 Loss < 10dB/100m BPM station 5 Jumper cable TIMES LMR240 Total loss < 0.5dB Blue line 30m, redundancy for installation 20m The longest cable should be shorter than 30m + 20m = 50m Total insertion loss < 0.1 * 50 + 0.5 + 0.5 = 6dB Libera Workshop, ESRF, Jun 2009

  11. BPM cable & processor installation Libera Workshop, ESRF, Jun 2009

  12. BPM data & functions ready for accelerator physicists Support by DLS package • ADC raw data @ 117MHz, 2048 points • First turn data synchronized by injection trigger • First 2048 samples of TBT data synchronized by injection trigger • Up to 0.5M samples of TBT data on demand • 10Hz SA data, orbit measurement • Embedded position interlock logic • User defined current scaling factor (beam current measurement) Instrumentation Technologies delivered • 10kHz FA data @ SFP port SSRF added some applications • 24 hours buffer for SA data @ EPICS DB level • Auto Gain Control logic (1Hz) @ EPICS DB level • Beam lifetime measurement @ EPICS DB level • Phase advance measurement @ EPICS DB level Libera Workshop, ESRF, Jun 2009

  13. Current performance • No obvious critical narrow band noise below 100Hz • Integrated noise @ [0 1kHz] smaller than 1um • Could be improved by identify & remove unknown noise source Libera Workshop, ESRF, Jun 2009

  14. Ring BPM resolution • COD resolution: typical <200nm, best <80nm, with ideal beam <40nm • TBT resolution: typical 3um • Uniformity of filling pattern is important for BPM performance COD resolution, BW 2Hz COD resolution @ topup operation TBT resolution, BW 350kHz 0.2mA 1mA 10mA 200mA Libera Workshop, ESRF, Jun 2009

  15. Beam current dependency (1) Reference BPM Normal BPMs Evaluated during injection (15minutes) BPM readings drift including: electronics BCD&FPD, BPM block drift, orbit drift More than 90% drift within 20um, few BPMs drift up to 70um @ [100mA 200mA] Electronics BCD&FPD only: within 5um @ [100mA 200mA] Libera Workshop, ESRF, Jun 2009

  16. Beam current dependency (2) Reference BPM Normal BPMs Evaluated during decay (2.5 hours) BPM readings drift including: electronics BCD&FPD, BPM block drift, orbit drift More than 90% drift within 10um, few BPMs drift up to 30um @ [170mA 200mA] Electronics BCD&FPD only: within 1.5um @ [170mA 200mA] Libera Workshop, ESRF, Jun 2009

  17. Filling pattern dependence (1) 48 32 16 8 4 2 Libera Workshop, ESRF, Jun 2009

  18. Filling pattern dependence (2) No evidence showed that BPM readings jumped due to filling pattern changing Libera Workshop, ESRF, Jun 2009

  19. Filling pattern dependence (3) refill Original fill No evidence showed that BPM readings jumped due to filling pattern changing Libera Workshop, ESRF, Jun 2009

  20. Libera application Libera Workshop, ESRF, Jun 2009

  21. Tune monitor configuration Configuration is the same for Booster and Ring Libera Workshop, ESRF, Jun 2009

  22. Tune monitor performance: Ring Typical TBT data during tune measurement Daily operation panel Daily operation: FFT of 10k TBT data, uncertainty < E-4 Precise measurement: FFT of 400k TBT data, uncertainty < E-5 Precise tune measurement Libera Workshop, ESRF, Jun 2009

  23. Tune monitor performance: Booster Horizontal ramping tune Vertical ramping tune Tune drift during ramping TBT data 400k samples, cover 240ms FFT windows size 2048, 1/1.23ms = 800Hz Tune measurement uncertainty < E-3 Libera Workshop, ESRF, Jun 2009

  24. Beam spectrum monitor (TBT) Current dependent few tens Hz noise @ copper cavity running. Gone with copper cavity Libera Workshop, ESRF, Jun 2009

  25. Beam spectrum monitor (TBT) Observed 15Hz & 46Hz noise, PS group targeted the source based on this information Libera Workshop, ESRF, Jun 2009

  26. Beam spectrum monitor (10Hz) 0.1Hz, 3.1Hz and 4.5Hz noise observed, still working to identify the source Libera Workshop, ESRF, Jun 2009

  27. Beam current & charge measurement • Libera could be used to measure beam current, data rate usually is better than PCT system. But • Orbit offset adjustment should be applied. • RF frequency adjustment should be applied. • Current scale factor (KI) and current offset should be precisely calibrated with PCT one by one. • It’s easy to do when machine running with fixed orbit. If orbit moving it will be very complicated. Libera Workshop, ESRF, Jun 2009

  28. Beam arrival monitor Sum signal of first turn, calculated from ADC data Bad cable connection, or huge orbit offset Injected beam First turn Multi turns Stored beam BI group SSRF, Feb 2008

  29. Beam current measurement @ ring Current resolution test RF frequency dependence observed Current resolution is better than PCT @ [0 50mA] Current measurement error 0.2% due to RF change Up to 2% current error due to orbit move Orbit dependence observed SSRF, Feb 2008

  30. BPM Phase advance monitor Cell 1 The phase difference between two neighboring BPMs can be calculated Libera Workshop, ESRF, Jun 2009

  31. Acknowledgment • Guenther Rehm and Micheal Abbott from DLS • Jean-Claude Denard from Soleil • Jim Sebek and Bob Hettel from SSRL, SLAC Libera Workshop, ESRF, Jun 2009

  32. Thanks

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