TEST RESULTS OF THE INTERNATIONAL S1-GLOBAL CRYOMODULE

Abstract

The S1-Global experiment is a collaborative project [1, 2] by INFN, DESY, FNAL, SLAC and KEK as part of the Global Design Effort (GDE) for the ILC. Eight superconducting RF cavities (two from DESY, two from FNAL and four from KEK) were installed into a cryostat. Three different types of frequency tuning systems (Blade tuner from INFN/FNAL, Saclay tuner from DESY/CEA-Saclay and Slide-Jack tuner from KEK) and two types of input couplers (TTF-III from DESY and STF-II from KEK) were implemented. In 2010-2011, operational tests were performed three times in the 2K environment, and many aspects of high-power pulsed operation of the cavities and associated hardware elements were studied, including: high power, cavity performance, Lorentz force detuning (LDF) and its compensation by Piezo actuators, simultaneous operation of cavities, static and dynamic heating loss, an RF system based on the Distributed RF Scheme (DRFS) [3] with LLRF (Low Level RF) feedback system. In this talk, results of the S1-Global cryomodule test are reported, discussed and summarized. KEK-STFにおける ILC に向けた S1-Global計画のクライオモジュール試験の結