S1-GLOBAL COLLABORATIVE EFFORTS 8-CAVITY-CRYOMODULE: 2 FNAL, 2 DESY AND 4 KEK

In an attempt to demonstrate an average accelerating gradient of 31.5 MV/m as in the design of the ILC, the S1-Global project [1,2] is a cryomodule being constructed and tested by an international collaboration hosted by KEK and including INFN, FNAL, DESY and SLAC. The S1-Global system joins two half-length cryomodules, each 6 m in length and containing 4 cavities, Module-C contains cavities from FNAL and DESY and was constructed by INFN. Module-A contains four KEK cavities and was constructed by KEK. The assembly of the cryomodules was completed in May 2010, and the cold test started from June 2010. In this paper, the international collaboration efforts of the S1-Global cryomodule are presented with the preliminary cold test results and the following test plans.