E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 1 Operational Results from STF-VTS and Cryomodule Tests at KEK Eiji Kako (KEK, Japan)

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Presentation transcript:

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 1 Operational Results from STF-VTS and Cryomodule Tests at KEK Eiji Kako (KEK, Japan)

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 2 Vertical test results of four STF-1 cavities STF-1 ; MHI-01 cavity MHI-02 cavity MHI-03 cavity MHI-04 cavity High power tests of STF-1 cryomodule in Sept.~ Dec

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 3 High power test results in STF-1 cryomodule Ave. Eacc,max (V.T) = 22.7 MV/m Ave. Eacc,max (C. T) = 23.7 MV/m No degradation in Eacc,max from VT was observed in the cryomodule tests. Operational gradient for ILC

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 4 Comparison of Eacc,max between VT and CT Qo drop at high gradients due to field emission was observed in the cryomodule tests. Heavy x-ray radiation due to field emission was observed with increase of Eacc. We need more careful work in a clean room and in the tunnel to avoid dusts contamination during the assembly.

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 5 FNAL DESY KEK Vertical test results of eight S1-G cavities

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 6 Comparison of Eacc,max between VT and CT High power tests of the S1-G cryomodule start very soon. Results of achieved Eacc,max will be added in this figure.

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 7 Calibration of Q t, Q HOM1, Q HOM2 in S1-G Cavity Q t (CT ) Q t (VT) Difference Q HOM1 Q HOM2 1.C1/AES x x % 6.08 x x C2/ACC x x % 9.45 x x C3/Z x x % 9.23 x x C4/Z x x % 4.93 x x A1/MHI x x % 1.90 x x A2/MHI x x % 1.53 x x A3/MHI x x % 9.27 x x A4/MHI x x % 9.96 x x10 13 difference of Q t = -20 / +28 % Q HOM1, Q HOM2 > 1 x10 12, OK accuracy of Eacc = -/+ ~10 % The cause of the difference should be investigated. Beam calibration will be useful.

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 8 Calibration of Q t at DESY by D. Kostin (DESY) ?? +32% -16% +48% +13% -14% -26% +53%

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 9 SUMMRY There was no severe degradation of the Eacc,max from V.T to C.T in four STF-1 cavities at KEK. Qo drop with heavy x-ray due to field emission was observed in #2 cavity at high gradients. More careful clean work in a clean room and in the tunnel is needed to avoid dusts contamination during the assembly. Results of eight cavities in S1-Global will be obtained in the end of September.