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1.3 GHz SRF Cavity R&D Plan

1.3 GHz SRF Cavity R&D Plan. Jiyuan Zhai ILC Group, IHEP 3 rd IHEP-KEK 1.3 GHz SRF Meeting, 7 Dec 2010, Beijing. Outline. 2011 Plan IHEP-01 (LG LL 9-cell w/o HOM) 2 nd VT IHEP-02 (LG LL 9-cell w/ HOM) fab, VT and dressing IHEP-03 (FG TESLA 9-cell w/ HOM) fab and VT 2012 and after

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1.3 GHz SRF Cavity R&D Plan

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  1. 1.3 GHz SRF Cavity R&D Plan Jiyuan Zhai ILC Group, IHEP 3rd IHEP-KEK 1.3 GHz SRF Meeting, 7Dec 2010, Beijing

  2. Outline • 2011 Plan • IHEP-01 (LG LL 9-cell w/o HOM) 2nd VT • IHEP-02 (LG LL 9-cell w/ HOM) fab, VT and dressing • IHEP-03 (FG TESLA 9-cell w/ HOM) fab and VT • 2012 and after • IHEP-02 horizontal test • ERL (7-cell and 2-cell), 2011-2015 • ADS (beta 0.8, 1.3 GHz 9-cell cavity) , 2012-2015 CW, High Current

  3. IHEP-01 large grain 9-cell cavity • Fabrication: 2009.2 – 2010.4 • Processing: 2010.4 -5 • 1st VT: 2010.6-7 • vacuum 2~5E-7 Pa • T-mapping, no X-ray mapping • Kyoto camera inspection • replica • 20 MV/m (cell #9, #2 quench) • defects not exactly identified • Field emission • CP stains or iris defects

  4. IHEP-01 defects and reprocessing Quench defects Field emitters CP stains – 2nd CP attention Iris defects – no way to remove, maybe not matter • X-ray photo (cell #9 slot) • Local grinding (cell #9) • CBP #9, 270°, 20 MV / m 1 mm 1 mm equator #4, 156° > 25 MV/m #3, 85° > 21 MV/m #2, 340° 33 MV/m

  5. IHEP-01 2nd processing and VT schedule

  6. IHEP-02 large grain cavity with HOM • low loss shape • end cell w/o HOM optimization • TESLA HOM coupler • quasi-TESLA end plate • tuner and bellow in the middle • Ti helium vessel • magnetic shield tubes inside • magnetic shield end caps outside • plug-compatibility • install into IHEP short cryomodule • distance from input coupler to end cell longer ( > 54 mm) • total length longer

  7. IHEP-02 End Group • IHEP-02 will be tested in FNAL or JLAB in 2011 for several times • try to adopt TELSA flanges and end plate to avoid new tooling, transitions and fixtures, except the input coupler port flange

  8. IHEP-02 Plan

  9. IHEP-02 Interfaces (FNAL) • only 1 of the 6 cavity flanges is different from TESLA • RF input through input coupler port, fixed coupling (what Qext?) • order input coupler flange and antenna from Kyocera • order helicoflex (CS20M45CI15037) from Usui • make new EP sealing for input coupler port • bottom flange evacuation (explosive and vacuum valve) • no electron monitor (top flange blanked) • HOM coupler pickups blanked • limited number of thermal sensors • second sound transducers can’t replace T-mapping system • no CP facility for the 1.3 GHz 9-cell cavity, CBP available • make same FNAL/ANL jig for EP, HPR, CBP… • pretuning only vertically (can’t use auto-machine due to shape) • bring manually tuning jig (mid and end) and software • fixed when Shekhar Mishra visit IHEP (Feb 2011)

  10. IHEP-02 Interfaces (JLAB) • VT same with FNAL • EP: cavity length, sealing, slight difference in the beam tube diameter, EP cathode rod available • CP available • Kyoto camera and QM1 • limited T-mapping • horizontal pre-tuning OK • reduced new interfaces as MHI-08 • sapphire HOM antenna for horizontal test • order antennas from Kyocera • Bob Rimmer IHEP visit (Feb 2011)

  11. IHEP-03 fine grain TESLA cavity plan IHEP-03 can be a backup for IHEP-02 module test, except the input coupler port. Or install to STF phase 2 CM2?

  12. I: Low Emittance SR II: BXERL 650m 1100m Beijing Light Source (2016-2025) 250MeV Linac • Main Ring • E=5 GeV • C=1200m • ~ 1 nm Booster C=300m Return Gun 5 GeV SRF Linac 1.3 GHz 7-cell Cavities

  13. Beijing Science Park 50 km North of downtown Beijing, include New SRF Lab

  14. ERL test facility cavities • Similar to KEK cERL • 35 MeV, 10 mA, 1.3 GHz RF • Photocathode DC gun and two 2-cell cavities as injector • Two 7-cell cavities of the main linac • 2010-2011: design (CDR-0 finished) • 2012-2013: fabrication and test (6 cavities) • 2014-2015: dressing, horizontal and beam test • Input couplers and HOM absorbers are challenging

  15. X区 ERL Test Facility in Hall #1 at IHEP campus 50 m x 12 m = 600 m2 Preliminary cost estimation : ~ 22 M USD 15

  16. China ADS 2022 ADS Prototype Reactor：~100 MW Acce：600~1000 MeV / 10 mA 2032 ADS Demo Reactor：~1000 MW Accel：1.5 GeV/ > 10 mA 2016 CIADS (1.7 B CNY) Reactor：~10 MW Accelerator： 50 MeV / 10 mA 120 MeV ? SC RFQ Possible site: Ordos, Inner Mongolia IS

  17. ADS Ordos BEPCII and BESIII 1800 km Jin Ping CJPL 2400 m deep Dayabay I & II CSNS upgrade ADS and China’s Future Neutrino Physics Experiment

  18. High energy end for the ADS linac Linac configuration under discussion 1.3 GHz 9-cell cavity (beta=0.8) SRF accelerator unit (2012-2015)

  19. SRF facilities for cavity development • Vertical test • Ultrapure water, High pressure rinsing system, clean room (to be qualified) • VT Dewar and helium recycling • New cryogenics system • T-mapping • EP for high Q and high gradient • New SRF lab, EBW machine, press and vertical trimming machine…

  20. Summary 2006-2010 • IHEP-01 9-cell cavity made the first try on the technique and infrastructures needed for the multi-cell cavity development. • IHEP-02 or IHEP-03 will demonstrate the 1.3 GHz SRF integration in IHEP, providing experience for ERL and ADS R&D in China. • ILC 1.3 GHz SRF technology will extend to various large scale projects in China - electron or proton, pulsed or CW machines. • Infrastructures and industrial partners of certain scale and qualification will soon be the limit for this development. 2011-2015 2020 -2030

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