Detail discussion of S1 Global at STF H. Hayano (KEK) GDE Mar 3-6, 2008.

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Presentation transcript:

Detail discussion of S1 Global at STF H. Hayano (KEK) GDE Mar 3-6, 2008

Need to be solved for S1 global 1. Cavity package collaboration from FNAL and DESY. need to start negotiation. 2. Cavity package installation into Cryostat. installation consideration started. 3. Schedule conflict with STF phase 2 and phase 3. tunnel access construction will conflict. -> postpone it. 4. Cryogenics cooling power is enough? need to check. (upgrade of 2k heat exchanger and collecting compressor?) 5. RF power, distribution, LLRF, cables enough? need to check. Maybe OK. 6. KEK Budget and man power support is enough? need to check. Maybe OK.

TESLA style : Final Performance in Vertical Tests high Qo > Eacc,max # MV/m # MV/m # MV/m # MV/m #2 and #4 Cav. additional EP (20 µm) H 2 O 2 Rinse (1h) Hot Rinse (1h) HPR (16h) 2 TESLA-style cavities (MHI) #5 and #6 are under fabrication with improved EBW, may deliver in April 2008.

9-cell Test Results Mostly Jlab and Some Cornell US Those go to CM2; candidates will be from new production.

TESLA-style #3 #4 #2 #1 20MV/m 20MV/m 29MV/m 21MV/m TESLA-style (DESY or US) #2 #5 #6 >32MV/m 29MV/m ??MV/m ??MV/m STF TESLA DESY1 DESY2 FNAL1 FNAL2 >32MV/m >32MV/m S1 Global : cavity installation S1 Global ( or TESLA-style#7?) ( or LL #7? #8?) Module AModule B Not yet decided for next If we go S1 global for next 1337mm

Make this construction 1 year postpone. We can use tunnel until , and little more.

CY STF FNAL S1 Global (connected module) Possible Schedule plans Y1, Y2 (Y3) tuner, jacket, coupler DESY X1, X2 (X3) tuner, jacket, coupler Module A Module B #5,#6 process, VT, jacket (LL #7,#8 process, VT, jacket) operation assembly connection STF1 (4 cavity test) LL #1 test disassemble 6 month operation exp. (#7, process, VT, jacket) ?

TESLA-style Cavity LL type Cavity Cavity Installation into Cryomodule Module A Module B

Module A (for TESLA-style) Module B (for LL cavity) S1 Global No coupler assey holder

DESY Cavities in STF cryomodule for S1 The design length between input couplers in the STF cryomodule=1337mm Design lengths of the STF cavities = mm for BL cavity, 1272 mm for LL cavity  Lengths of connection bellows and flanges: 78.4 mm for BL cavity, 65.0 mm for LL cavity Design length of the DESY cavity = 1293 mm  Lengths of three DESY cavities which have been delivered to KEK: 1290, 1290, 1286  Length of connection bellows and flanges in STF cryomodule: 43 mm The connection flanges and bellows was designed for installing the DESY cavities into the STF cryostat.

Designed Connection Flanges and Bellows Two flanges with bellows are tapped. The screwed holes do not penetrate the flanges. Designed bellow length: 29.1 mm Number of waves: 6 Changeability of length:  2mm Input coupler flange Designed for 1290 mm cavity

Expected contribution: cavity package cavity package: Cavity, Jacket, Tuner, coupler, Mag. Shield, HOM pickups, monitor pickup, coupler installation assembly, motor driver, piezo driver, associated instruments. Assembly participation, operation participation. *Sending them back after experiment. If it is special motor, piezo.