Current study status of high gradient at KEK Fumio Furuta KEK SCRF meeting Fermilab. Apr. 21-25 2008.

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Presentation transcript:

Current study status of high gradient at KEK Fumio Furuta KEK SCRF meeting Fermilab. Apr

ACD target ACD: Ave. Eacc=46.7±1.9MV/m Single cell cavity status (ICHIRO center cell shape) Recipe : CBP(100um)+CP(10um)+EP(80um) +EP(20  m)+flash EP(3  m) +HPR+Baking Narrow scattering, high performance. MP process needed. How to eliminate MP? Strengthen rinsing after EP.

ICHIRO 9-cell cavity status 9cell-#1~#3 9cell-#0 (w/o HOM) MP barrier at taper of BP FE caused by end group Large beam tube, complicated structure of end group Contamination from HPR pump by long operation. Key points Re-design of ICHIRO and end-single cell study Replacement of HPR pump: plunger->diaphragm

Field Emission by Plunger HPR Pump contamination Final filter -before use- Contaminated Silicon grease used at plunger sealing of HPR pump! HPR pump was replaced to diaphragm type on beginning of Sep Successfully Qualified by single cell cavity tests! Fixed!

42MV/m 45MV/m ISE#2 (old) ISE#3 (new) ISE#4 (new) ISE#5 (old end group) Full HOM Just HOM cylinder 50MV/m 52MV/m Ethanol Rinsing End-single cell cavities End-cell shape has no problem. Ethanol rinse has big effects on end groups.

ISE#5 tight loop test EP(20  m)+flash EP(3  m) +Ethanol rinsing (10min., r.t.) +Degreasing(MICRO-90, 2%, 1hr, 50C) +HPR(Nomura, UPW) +Baking(120C*48hrs) Eacc[MV/m]Qo 3 rd e9 4 th e9 5 th e9 12 th e9 Repeat ISE#5 Full HOM

9-cell = + x7 + = 50MV/m? Center-cellend-cell Old New Redesigned 9-cell cavity : New Ichiro 9-cell Ready to EP, VT I9#5→sent to J-lab (EP+VT)*3. #5, #6 :w/o end groups #7, #8 :w/ end groups

+EP(20  m) + Degreasing + HPR +EP(20  m) + flash EP(3  m) + Degreasing + Ethanol rinsing + HPR +EP(20  m) + Ethanol rinsing + HPR will be tested Studies for strengthen rinsing by single cell cavities +EP(20  m) + flash EP(3  m) + HPR High reliability, but still MP process needed. Well work for reduction of MP. Well work for end group rinsing. Need more statistics. (A) (B) (C) (D) 46.7±1.9MV/m (N=6) 44.2±6.4MV/m (N=5)

Summary ・ Surface treatment recipe for single cell (center cell shape) was almost fixed. Degreasing has effect on reduction of MP. ・ Limitations of ICHIRO 9-cell (#0,1,2 and 3) cavities were related to end group and contamination from plunger HPR pump. ・ Plunger pump was replaced to diaphragm pump, it works well. ・ End-cell shape single cell cavities were fabricated and tested to understand the end groups. ・ Ethanol rinsing have effect on end group rinsing. End cell cavity with full end group reached 45MV/m. For the end single cell cavities, more statistics will be collected. ・ 4 re-designed ICHIRO 9-cell (#5, 6, 7, and 8) were fabricated. #5 and #6 have simple beam tube, #5 was tested and reached 36MV/m at J-lab. #7 and #8 have full end group, will be tested next month at KEK.