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12.4: SRF HOM Diagnostics: Experimental Results and Future Plans

12.4: SRF HOM Diagnostics: Experimental Results and Future Plans. Nicoleta Baboi*, Liangliang Shi* # *DESY; # UMAN for the HOM-team EuCARD2 WP12 Meeting 16 April 2014, Saclay. Aim. HOM-based beam diagnostics for the European XFEL (E-XFEL) Beam phase ( wrt RF) and position

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12.4: SRF HOM Diagnostics: Experimental Results and Future Plans

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  1. 12.4: SRF HOM Diagnostics:Experimental Results and Future Plans Nicoleta Baboi*, Liangliang Shi*#*DESY; #UMAN for the HOM-team EuCARD2 WP12 Meeting 16 April 2014, Saclay

  2. Aim • HOM-based beam diagnostics for the European XFEL (E-XFEL) • Beam phase (wrt RF) and position • In 3.9 GHz and 1.3 GHz cavities • Strong interconnection to the FLASHlinac • Benefits • Reduction in emittance dilution from transverse wakefields bycentering beam in accelerating cavities • Direct, on-line measurement of beam phase wrt RF phase • Additional beam position monitoring

  3. Contents • Introduction • Principle • The European XFEL and FLASH • Overview of HOM-based diagnostics • HOM-based beam position monitoring • for 1.3GHz cavities • for 3.9GHz cavities • HOM-based beam phase monitoring • for 1.3GHz cavities • [for 3.9GHz cavities] • Partial summary • Stability study → Liangliang Shi

  4. Principle • Filter higher dipole mode for beam position • Filter higher monopole mode for beam phase × Phase difference Beam offset [mm]

  5. The European XFEL accelerating structures experimental hall undulators http://www.xfel.eu/

  6. FLASH

  7. Accelerating Cavities for the E-XFEL and FLASH The 1st dipole band HOMBPM The 2nd dipole band The 1st dipole band Coupled cavities

  8. Status and Plans for HOM-based Beam Position Monitoring (HOM-BPM)

  9. Status and Plans for HOM-based Beam PhaseMonitoring

  10. Status and Plans for HOM-BPM / 1.3 GHz cavities / FLASH Past experience /Achieved past year / Under work /EuCARD-2 challenges

  11. Status and Plans for HOM-BPM / 1.3 GHz cavities / E-XFEL Past experience /Achieved past year / Under work /EuCARD-2 challenges

  12. HOM-BPM / 1.3 GHz cavities / E-XFEL:Electronics Designed and Tested in Lab • Single channel: • Direct sampling of all three frequencies without any downconversion • mTCA standard RTM sideAMC side SamerBou-Habib, WUT, DESY

  13. HOM-BPM / 1.3 GHz cavities / E-XFEL:Electronics Designed and Tested in Lab (2) • System architecture • 8 channels SamerBou-Habib, WUT, DESY RF1 .. .. RF8 8 RTM sideAMC side 6 DRTM-HOM DAMC-DS800 REF FP CLK +Distribution REF (RF-backplane) CLKout

  14. HOM-BPM / 1.3 GHz cavities / E-XFEL:Electronics Designed and Tested in Lab (3) • Filter test board • two filters, one on each side • each for 3 frequencies (1.3/1.7/2.4) • Example measurement • Attenuation settings: -8dB @1.3 GHz, -16db @ 1.7 GHz, -24dB @dB • The filter should be tuned and then implemented in an 8 channel RTM RF1 .. .. RF8 8 6 DRTM-HOM REF FP CLK +Distribution REF (RF-backplane) CLKout

  15. Status and Plans for HOM-BPM / 3.9 GHz cavities / FLASH Past experience /Achieved past year / Under work /EuCARD-2 challenges

  16. HOM-BPM / 3.9 GHz cavities / FLASH:Electronics from FNAL Installed Nathan Eddy, FNAL LO uTCA Digitizer SIS8300 (108MS/sec) BandpassFilter~5.43 GHz or 9.06 GHz100 MHz BW Mixer 30 MHz IF

  17. HOM-BPM / 3.9 GHz cavities / FLASH: 5GHz Downconverter and PLL Boards Nathan Eddy, FNAL

  18. HOM-BPM / 3.9 GHz cavities / FLASH:First Beam signals on scope • 5 GHz (C1H2) • 9 GHz (C1H1) Signals from 9 bunches

  19. HOM-BPM / 3.9 GHz cavities / FLASH:Raw ADC Signals in DOOCS Each plot: signal from one HOM coupler Signals from 2 bunches

  20. Status and Plans for HOM-BPM / 3.9 GHz cavities / E-XFEL Past experience /Achieved past year / Under work /EuCARD-2 challenges

  21. HOM-BPM / 3.9 GHz cavities / E-XFEL:Design of 5 GHz Down-converter ready LO BandpassFilter~5.43 GHz or 9.06 GHz100 MHz BW Mixer uTCA Digitizer SIS8300 (108MS/sec) 30 MHz IF Thomas Wamsat, DESY

  22. HOM-BPM / 3.9 GHz cavities / E-XFEL:Design of 5 GHz PLL ready • Design of 9 GHz DCW and PLL under work Thomas Wamsat, DESY

  23. Status and Plans for HOM-PhMon / 1.3 GHz cavities Past experience /Achieved past year / Under work /EuCARD-2 challenges

  24. HOM-PhMon/ 1.3 GHz cavities / E-XFEL:Electronics Designed and Tested in Lab • Same as electronics as presented for HOM-BPM / 1.3GHz RTM sideAMC side SamerBou-Habib, WUT, DESY

  25. Status and Plans for HOM-based Beam PhaseMonitoring Past experience /Achieved past year / Under work /EuCARD-2 challenges

  26. 1st Deliverable Approaching • Report on the design of electronics for XFEL-HOM diagnostics (M18) • Good progress: • 1.3GHz cavities • design ready • tests to be made with beam • 3.9GHz cavities • Design for 5GHz channels ready • 1st boards should be ready in May and then tested in lab • Design of 9GHz channels will follow

  27. Summary of Part 1 • HOM-based BPMs • for 1.3GHz cavities: • prev. experience with electronics at FLASH • Design of electronics for the XFEL finished -> 1st milestone • Next: Tests with beam • for 3.9GHz cavities • FNAL electronics installed at FLASH • E-XFEL electronics: design in advanced stage -> 1st milestone • Next: Tests in lab and with beam • HOM-based phase monitoring • for 1.3GHz cavities • Design of electronics for the XFEL finished -> 1st milestone • Next: Tests with beam • Not for 3.9GHz cavities • Part 2: Stability study → LiangliangShi

  28. Part 2: Liangliang Shi Past experience /Achieved past year / Under work /EuCARD-2 challenges

  29. Thank you!

  30. Reserve Slides:

  31. Subtask 10.5.1 Two Choices for HOMBPM Electronics Localized modes 9060 MHz Coupled modes 5437 MHz “Common position” of power minimum Integratedpower RMS Error at Module Center Pei Zhang

  32. Specs for Final Electronics for FLASH defined • Based on EuCARD work, specs defined for HOMBPM electronics for • FLASH • The European XFEL • More research necessary, since there will be 8 cavities in 3.9 GHz module (EuCARD2, incl. 1.3 GHz cavities) BandpassFilter~5.43 GHz or 9.06 GHz100 MHz BW uTCA Digitizer SIS8300 (108MS/sec) Mixer LO 30 MHz IF Brian Fellenz, Nathan Eddy, Fermilab

  33. Challenges The 5th dipole band Dipole beam-pipe modes The 1st and 2nd dipole band Fundamental band Large R/Q’s Modes propagate Pei Zhang HOMSC12, Cockcroft Institute, Jun 26th, 2012 Page 33

  34. Electronics for 3.9GHz/FLASH from FNAL: Design 5 GHz & 9GHz DOWNCONVERTERS FOR PHASE MEASUREMENTS 5 GHz DOWNCONVERTERS 9GHz DOWNCONVERTERS IN IN 4 IN 3 IN IN IN IN 5 IN 2 IN 6 IN 1 8-WAY SPLITTER P. S. +15V P. S. +7V BPF BPF BPF BPF BPF BPF BPF BPF BPF BPF 4-WAY SPLITTER CAN BUS CONTROLLER BOARD 9 GHz DC 9 GHz DC 9 GHz DC 9 GHz DC 9 GHz DC 5 GHz DC 5 GHz DC 5 GHz DC 5 GHz PLL 9 GHz DC 9 GHz DC 9 GHz PLL 5 GHz DOWNCONVERTERS [30MHz OUT] 5 GHz & 9GHz DOWNCONVERTERS [30 MHz OUT] 9GHz 5GHz LO MON. OUT 81MHz INPUTS 9GHz DOWNCONVERTERS [30 MHz OUT] CAN I/O

  35. 5GHz Downconverter Board from FNAL RF Monitor -2 dB 36 dB GAIN IFMon. 30MHz BPF BW: 15MHz -20 dB 40MHz LPF -20 dB 0-31 dB Output 30 MHz RF INPUT 18 dB 18 dB 14 dB Output 30 MHz 18 dB -10 dB LO Monitor 19 dB RF DET. GAIN CTRL LO INPUT LO MON ATTEN 5-Bits I MON +7V

  36. 9GHz Downconverter Board from FNAL RF Monitor 36 dB GAIN IFMon. 30MHz BPF BW: 15MHz -20 dB 40MHz LPF -6 dB 0-31 dB Output 30 MHz RF INPUT 18 dB 18 dB 19 dB 19 dB Output 30 MHz 18 dB -10 dB LO Monitor 19 dB RF DET. LO INPUT LO MON ATTEN 5-Bits +7V I MON

  37. 5GHz PLL Board from FNAL LOOP FILTER RF 5 GHz OUTPUT +8 dBm HMC702LP6CE PLL CP 16dB REF 15 dB 3 dB 2-WAY SPLITTER 81MHz BPF BW: 7MHz HMC430LP4 VCO Output 81.25 MHz TEST CONNECTOR SCK SDI SEN RSTB SDO +7V +15V

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