1. Jiyuan Zhai ( IHEP ) TTC Meeting, JLAB, 6 Nov 2012
IHEP ILC Cavity R&D
Jiyuan Zhai ( IHEP )
TTC Meeting, JLAB, 6 Nov 2012

2. Outline 9-cell Cavities ILC-type Short Cryomodule Summary
low loss large grain w/ & w/o HOM, TESLA-like
ILC-type Short Cryomodule
cryomodule, input coupler, tuner, helium vessel, magnetic shield
Summary
2012/11/6
J. Zhai, JLAB TTC Meeting

3. Low-Loss Cavities (IHEP-01, IHEP-02)
Large Grain Nb from Ningxia
IHEP-01 w/o HOM
20 MV/m (CBP+CP)
IHEP-02 w/ HOM
EBW finished this week
dumbbell frequency control
to process and test in FNAL
CBP (with FNAL recipe)+EP
higher Eacc and higher Q0
2012/11/6
J. Zhai, JLAB TTC Meeting

4. TESLA-like Cavity (IHEP-03)
Fine grain 9-cell w/ HOM
improve EBW structure
simplify dumbbell freq. control
better EBW environment
Collaborate with KEK
drawings, experience
process and test in mid 2013
Pressure vessel certification for next cavity, install to STF2 linac?

5. ILC-type Short Cryomodule
Key Technology R&D and demonstration Components fabrication and test ongoing Module assembly in mid 2013 Horizontal test in 2014 (cryogenic plant and MBK)
Cavity package Input coupler Tuner LLRF system Cryomodule
2012/11/6
J. Zhai, JLAB TTC Meeting

6. Cryomodule Fabrication
2012/11/6
J. Zhai, JLAB TTC Meeting

7. High Power Input Coupler
Two STF-type input couplers fabricated in Vacuum problems due to weak sealing structure. Two modified input couplers in fabrication. High power test in early 2013.
thick coating bubbles thin coating sublimes
Problems with Copper Coating
Cold Window and Inner Conductor
Warm Window
Doorknob Transfer
2012/11/6
J. Zhai, JLAB TTC Meeting

8. Helium Vessel & Tuner magnetic shielding cylinder inside,
Cavity 30 kg,Tuner 36 kg (not shown)
Helium vessel and magnetic shield 23 kg
IHEP-02
support
support
magnetic shielding cylinder inside,
end caps shielding outside
Stress much below the yield limit
Slide jack tuner prototype tested on KEK MHI-04 cavity in 2011.
New tuner fabrication finished.
Ti Bellow Cryogenic Motor Piezo Tuner Test Stand
2012/11/6
J. Zhai, JLAB TTC Meeting

9. Remnant magnetic field on cavity wall
Magnetic shielding
Choose 1J79-1.3
H (Oe)
Remnant magnetic field on cavity wall
(red: along cavity axis, blue: perpendicular)
Material tested at different temperatures.
Effect of shielding calculated by Opera-3D
Earth magnetic field at Beijing: 500 mG. Cryomodule may enhance the field.
Simulation shows if the cavity is set up along East-West direction, the remnant field is below 10 mG; if cavity in North-South, the two end cells will be exposed to high magnetic field. Ignoring the effect of the cryomodule vacuum vessel, cavity Q0 will be ~50 % lower for one cavity case.

10. Summary ILC-type short module integration in 2013 at IHEP.
Large grain low-loss shape cavities for high gradient and high Q0 (CBP+CP, EP).
TESLA-like cavity for industrialization (R&D prototype, in- house EBW study, transfer to company) and beam test.
2012/11/6
J. Zhai, JLAB TTC Meeting

11. We would like to thank KEK, FNAL, JLAB and DESY colleagues for their collaboration and support.
Thank you.
在 “幻灯片放映”模式，单击箭头进入 PowerPoint 入门中心。
On behalf of the IHEP ILC SRF Team
TESLA Technology Collaboration Meeting, JLAB, 6 Nov 2012