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First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner

First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner. Sun YI （孙 毅） Accelerator Center, IHEP June 10, 2009. content. Review on BEPC RF & BEPCII SRF Block diagram of 1.3GHZ LLRF Tuner and piezo of 9-cell cavity Problems Summary.

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First Mini-workshop on IHEP 1.3GHZ SRF LLRF and Tuner

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  1. First Mini-workshop on IHEP 1.3GHZ SRFLLRF and Tuner Sun YI （孙 毅） Accelerator Center, IHEP June 10, 2009

  2. content • Review on BEPC RF & BEPCII SRF • Block diagram of 1.3GHZ LLRF • Tuner and piezo of 9-cell cavity • Problems • Summary

  3. Beijing Electron Positron Collider (BEPC)Institute of High Energy Physics, CAS 1984 foundation 1988 first beam collision 2003 upgrade from one ring to double ring machine Dec.2006 beam commissioning 240m linac (1.89-2.5GeV) SRF stations Detector 240m Storage Ring

  4. The old BEPC was one Ring machine before the upgrade at 20054 cavities of 200MHz in BEPC tunnel 4 transmitters ( tetrode ) inside West RF hall2×30KW to feed one cavity ( 200MHz ) LLRF station for 4 cavities

  5. 2 LLRF stations are located respectively at the East/west RF hall beside each Klystron & PS, the cryogenic hall is above the test room

  6. PLC touch panel for each SRF station

  7. In a station: Superconducting cavity,250KW klystron and LLRF control system

  8. PLC touch panelshow different pages:1) RF system interlock2) main parameters3) plot 4) cryogenic & cavity Q0

  9. Part 2 block diagram of 1.3GHZ LLRF FPGA

  10. F-1 signal generation

  11. Prof. Wang Guangwei is in charge of the R&D of the FB loops of LLRF.Liu Rong ( PH.D student ) will visit KEK and work at STF for the digital LLRF feedback loops on Sep., 2009 LLRF workshop will be hold on Oct.,2009 at KEK, A chance of discussion and working for the FB loops at STF.

  12. Part 3 tuner and piezo targetfor Q0~1010、QL~106→BW~1000HZ 1.3GHZ cavity freq. <±0.10，→±1HZ →dynamic range±~3nm STF target : →±50HZ ( with beam?)

  13. 4 kinds of tuner Slide Jack 290N/mm (STF) Blade 25N/um ( INFN for TTF ) Coaxial Ball Screw 500N/mm (Saito) Cam+lever 60N/um (Saclay-2)

  14. First try to test a slide jack tuner • IHEP case: one cavity in one cryostat • Spring compensation for BEPCII cavity • STF cavity only rely on elastic force ? (without compensation spring) • How to “pre-tuning” under 2K?

  15. BEPCII超导腔调谐补偿弹簧示意图 补偿弹簧 补偿弹簧力=piezo力+Nb腔受力 电机齿轮推动piezo底座，合力推动杠杆； 两根杠杆各安装有补偿弹簧，在降温后先预调谐，然后才可开始RF调试腔自动谐振

  16. Conception design of tuner and cryostat is on the way

  17. IHEP 1.3GHZ SCC tuner piezo plate fixed flange moved flange

  18. STF freq. vs tuner position ≈300KHZ/mm

  19. Slide jack tuner of STF

  20. IHEP need more Simulation and calculation cavity freq. ~ tuner force ~ Ti jacket StiffnessIHEP should reduce the mistakes and risks before the fabrication of the tuner.

  21. Stiffness of the Tuner System KCavity KJacket KTuner 80 N / mm 220 N / mm 59 N / mm

  22. Improvement in the STF Baseline Cavities Ｆｒ Ｆｚ Cell Taper 13 deg. →10 deg. TTF Cavity Beam Tube f78 → f84 STF Baseline Cavity Inside M – Shield. Thick Titanium Baseplate, Thick Nb Beam Tube & Thick Nb End-cell Input Port f40 → f60 STF Baseline Cavity TTF Cavity Stiffness of Cavity Fixing Support72 kN/mm22 kN/mm Lorentz Detuning-520 Hz-870 Hz(31.5 MV/m)

  23. Part 4 problems: Location of Tuner ( in the middle or in one side of cryostat ? ) 波纹管 低电平pickup天线接口 滑动支撑点 固定支撑点 HOM吸收器口 coupler接口 真空接口 supporting rod

  24. 直线导轨 Linear guider 齿轮传动机构 丝杠螺母机构 Upgrade to STF tuner is possible? Piezo孔 参考面 基准面

  25. Other questions • STF tuner had been test at RT , cold test on the tuner is needed? • The motor screw is too long, why STF did not set the motor inside the tank? • How to measure the tuner position? • The materials of roller wedge and ball? • Details of the taper gear, and motor gear box • Materials of tuner flange and 4 supporting rod?

  26. summary • IHEP have collected experience on the KEKB superconducting cavity, and have a happy history of the co-operation with KEK • the design on 1.3GHZ tuner and LLRF has been begun since the end of 2008, there is a hard way to reach the test with cavity. • IHEP still keep a lot of questions and hope the help from STF experts THANKS!

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