2. SCRF General Preparation for the AD&I Preparation for AAP Review

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Presentation transcript:

2. SCRF General Preparation for the AD&I Preparation for AAP Review SB2009 document, and DESY meeting, Dec. 2-3, Cavity gradient (operational) to be re-evaluated by Quarter-1, 2009 Preparation for AAP Review at Oxford, Jan. 6-8, 2010, Next SCRF meeting Dec. 9, 2009: last meeting before SB2009, AAP A. Yamamoto 09.11.11 SCRF WebEx meeting

Global Plan for SCRF R&D Year 07 2008 2009 2010 2011 2012 Phase TDP-1 TDP-2 Cavity Gradient in v. test to reach 35 MV/m  Yield 50%  Yield 90% Cavity-string to reach 31.5 MV/m, with one-cryomodule Global effort for string assembly and test (DESY, FNAL, INFN, KEK) System Test with beam acceleration FLASH (DESY) , NML (FNAL) STF2 (KEK, extend beyond 2012) Preparation for Industrialization Production Technology R&D A. Yamamoto 09.11.11 SCRF WebEx meeting

New Production Yield after 1st and 2nd Pass (RF) Test Yield at 35 MV/m: 22 % at 1st pass 33 % at up to 2nd pass 1st pass 2nd pass improvement degradation ILC Operation at <31.5 MV/m> Yield reaching ~ 40 % Reported by C. Ginsburg and GDB team A. Yamamoto 09.11.11 SCRF WebEx meeting

Alternate Yield Plot SCRF WebEx meeting Yield is estimated assuming a specific lower cut-off in cavity performance, below which cavities are assumed 'rejected’. Error bar is +/- one RMS value (standard deviation of the population) of the remaining (accepted) cavities (gradient above cut-off). Additional bars (min, max) inidcated the minimum and maximum gradients in the remaining (accepted) cavities. A. Yamamoto 09.11.11 SCRF WebEx meeting

Progress and Prospect of Cavity Gradient Yield Statistics PAC-09 Last/Best 2009-05 FALC 1st Pass 2009-07 ALCPG 2nd Pass 2009-10 To be added (2009-11) Coming Prod. Y. (2010-06) Research cavities DESY 9 (AC) 16 (ZA) 8 (AC) 7 (ZA) 14 (AC/ZA) 10 (Prod-4) 5 8 (large G.) JLAB FNAL/ANL/Cornell 4 (AE) 1 (KE-LL5) 1 (JL-2) 7 (AC) ~ 5 (AE) 12 (AC) 6 (AE) 6 (NW) (including large-G) KEK/IHEP 5 (MH) 2 (MH) ~5 (LL) 1 (IHEP) Sum 39 22 21 20 25 ~ 20 G-Sum 41 66 Statistics for Production Yield in Progress to reach > 60, within TDP-1. We may need to have separate statistics for ‘production’ and for ‘research’, A. Yamamoto 09.11.11 SCRF WebEx meeting

Cavity Gradient Study - Status Yield at 35 MV/m (w/ established vendors: RI, Zanon) 22 % at 1st pass (statistics 22) 33 % at 2nd pass (statistics 21, as of 2009-07)) Average Gradient reaching 30 MV/m DESY Prod-4 data to be added, (10 more statistics) New statistics coming (w/ potential vendors) AES: to be counted from #5 (to be confirmed) MHI: to be counted from #5 (to be confirmed) Selecting statistics needed for ‘Production Yield’ to evaluate readiness of industrialization and cost Note: Numbers of Cavities for ‘gradient research’: need to be separately counted. A. Yamamoto 09.11.11 SCRF WebEx meeting

AES-JLAB/FNAL Progress Reported by R. Geng A. Yamamoto 09.11.11 SCRF WebEx meeting

Achievement with Contribution of basic R&D for surface conditions 洗浄 Possible reasons for improvement: ・Water rinsing (increased flow rate, time) ・Detergent rinsing．・EP solution condition (aged)． A. Yamamoto 09.11.11 SCRF WebEx meeting

S1 Goal: Achieved at DESY/XFEL Average field gradient at CMTB : > 31.5 MV/m - First XFEL prototype module exceeds 31.5 MV/m average - Module will see beam in FLASH in 2010 (av. of 30MV/m) - Cryostat (cryomodule cold-mass) contributed by IHEP A. Yamamoto 09.11.11 SCRF WebEx meeting

A Proposal for Re-baseline Cavity Gradient and Yield, in TDP-2 S0: Maximum gradient of 35 MV/m (@ Q0 = 8E9) in vert. test Keep R&D goal: yield of 90 % at 35 MV/m, and Recognize that the yield may be acceptable to be ~ 50 % with the +/-20 % distribution (i. e., b/w 28 and 42 MV/m) of the gradient. S1: Cavity-string: E = <31.5 MV/m> (@ Q0 = 1E10) in cryomodule Keep the ‘averaged field gradient’ in cryomodule string, and Recognize Acceptable gradient spread of ~ 20 % in operation See the recent progress at DESY PXFEL cryomodule test result S2: Cryomodule string w/ RF operationability Need to re-evaluate the level of operational margin to be required in accelerator beam operation, It may need to take into account to determine the ILC operational field gradient, (>> we need to discuss it) A. Yamamoto 09.11.11 SCRF WebEx meeting