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IHEP-02 1.3 GHz 9-cell Cavity R&D Status and Plan

IHEP-02 1.3 GHz 9-cell Cavity R&D Status and Plan. GAO Jie, ZHAO Tongxian, ZHAI Jiyuan, LI Zhongquan, LI Dazhang, LIU Zhenchao Institute of High Energy Physics, Chinese Academy of Sciences CHEN Jinzhe, QIAO Jianqiang Beijing Hejieli Science and Technology Development Co. Ltd.

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IHEP-02 1.3 GHz 9-cell Cavity R&D Status and Plan

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  1. IHEP-02 1.3 GHz 9-cell CavityR&D Status and Plan GAO Jie, ZHAO Tongxian, ZHAI Jiyuan, LI Zhongquan, LI Dazhang, LIU Zhenchao Institute of High Energy Physics, Chinese Academy of Sciences CHEN Jinzhe, QIAO Jianqiang Beijing Hejieli Science and Technology Development Co. Ltd. YUAN Hong, YU Huai, WANG Jinxue Beijing Institute of Aviation Materials The Third IHEP-KEK 1.3GHz SC Technology Collaboration Meeting Dec. 7-8, 2010, IHEP, Beijing

  2. OUTLINE • Backgound of the IHEP 9-cell cavity • IHEP-02 R&D goal and schedule • IHEP-02 Fabrication Procedure • HOM coupler

  3. BACKGROUND • IHEP-01: Low-Loss Type 9-cell Cavity with Bare Tubes (VT) • IHEP-02: Low-Loss Type 9-cell Cavity with Full End Groups (VT&HT) First Vertical Test Result Of IHEP-01 20MV/m (2010.07.01@KEK,STF) IHEP-01

  4. IHEP-02 R&D GOAL, SCHEDULE • IHEP-02 with full end groups for the horizontal test • Achieve the requirement of ILC • 25-35MV/m for the vertical test • 20-31.5MV/m for the horizontal test

  5. OUTLINE • Backgound of the IHEP 9-cell cavity • IHEP-02 R&D goal and schedule • IHEP-02 Fabrication Procedure • HOM coupler

  6. Large Grain Niobium Sheets The cavity material • disks from Ningxia OTIC (Nov., 2008) • inspection, CP, annealing • ultrasonic and eddy current scanning tests • mechanical behavior sample test at room temp. and 4K • RRR measurement • We do that when we made the IHEP-01

  7. Nb sheets thickness measurement 1: NOT GOOD 2: GOOD The problem：uneven thickness like the above sketch map(1)will lead to large crack, the Uniform thickness maybe good, but we think uneven thickness like the good cketch map(2) may be better.

  8. IHEP-02 Progress After trimming, Waiting for measurement 1: deep drawing 2: trimming Annealing @900OC, 3Hours Heating and cooling speed： 300OC/H 4: After annealing, we deep drawing the half cell again. 3: Annealing after first trimming Some half cells

  9. Comparing of the twice deep drawing After the first deep drawing After the second deep drawing Half cell No. Standard deviation

  10. IHEP-02 Progress The half cells Frequency measurement of the half cell length, iris and equator diameter measurement

  11. The measurement data Iris diameter Frequency of the half cell Iris wall thickness

  12. IHEP-02 Progress Equator roundness reshaping 20 μm chemical polishing of half cells, ultrasonic cleaning, rinsing, 3 μm chemical polishing at iris area, Rinsing, EBW. New Fixtures for cell equator roundness equator roundness reshaping

  13. equator roundness reshaping result after reshaping Before reshaping No. Standard deviation

  14. IHEP-02 Progress Dumbell without stiffening ring Dumbell with stiffening ring

  15. stiffening rings forming

  16. stiffening rings forming

  17. OUTLINE • Backgound of the IHEP 9-cell cavity • IHEP-02 R&D goal and schedule • IHEP-02 Fabrication Procedure • HOM coupler

  18. IHEP-01 Mode; Freq. --- R/Q Boundary conditions: Electric-Electric & Magnetic-Magnetic

  19. IHEP 01 QECALCULATION TE111：Freq. 1.6023GHz，1.6034GHz Qe: 4.24e+004，7.85e+004 TM010：1.3GHz，Qe2.88e+010 CST Model TM011：2.16GHz Qe：2.97e+004 TM110：1.87GHz，Qe1.37e+004 LL cavity with Tesla HOM coupler

  20. HOM coupler material 5 Tesla HOM couplers

  21. IHEP-02 next plan • HOM coupler fabrication will be speed up. • End groups fabrication • Cavity Welding • IHEP-02 will be finished at early 2011

  22. Summary • The multi-cell cavity is one of the key components for 1.3 GHz SRF technology R&D of IHEP. • We have developed effective methods, procedures, tools and facilities to fabricate and tune the 9-cell cavity. • The IHEP-01 finished fabrication and EBW, surface treated at IHEP and tested at KEK STF in July 2010. 20MV/m. It will be test at kek again in early 2011. • The IHEP-02 will finish in early 2011, surface treated at IHEP and test in middle 2011.

  23. Thanks for your attention

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