1. Progress on MICE RFCC Module for the MICE Experiment * Allan DeMello, Nord Andresen, Michael Green, Derun Li, Heng Pan, Steve Virostek, Michael Zisman (LBNL, Berkeley CA 94720, USA), Don Summers, Mike Reep (University of Mississippi, Oxford MS 38677, USA) An-Bin Chen, Xiao-Kun Liu, Feng-Yu Xu, Shi-Xian Zheng (HIT, Harbin, China), Yun Cao, Sen Sun, Li Wang, Lixin Yin (SINAP, Shanghai, China) on behalf of the MICE Collaboration Abstract This report describes the recent progress on the design and fabrication of RFCC (RF and Coupling Coil) module for the international Muon Ionization Cooling Experiment (MICE). The MICE cooling channel has two RFCC modules; each RFCC module has four 201-MHz normal conducting RF cavities and one superconducting solenoid magnet. The magnet is designed to be cooled by three cryocoolers. Fabrication of the RF cavities is complete; design and fabrication of the magnets are in progress. The first magnet is expected to finish by end of 2011. Dynamic RF Cavity Tuner The RF Cavity: All 10 RF cavities are fabricated and at Lawrence Berkeley Lab * This work was supported by the Office of Science, U.S. Department of Energy under DOE contract number DE-AC02-05CH11231. Layout of the International Muon Ionization Cooling Experiment (MICE) at Rutherford Appleton Laboratory, UK Single Cavity Vessel Prior to having the MICE RFCC module, the single cavity vessel will allow us to:  Check engineering and mechanical design  Test of the RF tuning system with 6 tuners on a cavity and verify the frequency tuning range  Obtain hands-on experience on assembly and procedures – Cavity installation Tuners and actuators Beryllium windows RF couplers and connections Water cooling pipe connections – Aligning cavity with hexapod support struts – Vacuum vessel support and handling – Verify operation of the getter vacuum pump system Summary and schedule: The cavity fabrication is complete; all 10 cavities have been delivered to LBNL. Mechanical polish and electropolish of the inside of the cavities will be done by the end of 2011. Design and fabrication of the coupling coil magnet is proceeding well. Qi Huan Corporation in Beijing, China has completed the winding and banding of the first superconducting coil. They have already fabricated the coil bobbins for the remaining two coils and also finished three cover plates to complete the cold-mass assemblies. The cryostat drawings are complete and fabrication of the parts will begin soon. The cooling system design is complete and the drawings are near completion. Preparations for testing of 6 RF tuner and actuator assemblies on a cavity are ongoing. We expect to have the single vacuum vessel cavity fabricated and the test of the RF tuner system finished by the end of 2011. RFCC Module  The RFCC integrates four normal conducting RF cavities with a superconducting solenoid magnet Superconducting Coupling Coil Cavity RF Couplers 201-MHz RF cavity Getter Vacuum Pump Module support Remaining tasks:  Cleaning  Electro-polishing (EP)  Setting the center frequency to the 10 cavity mean  Test the cavity RF tuner system Liquid Hydrogen Absorber and Focusing Coil (AFC) Module Spectrometer Solenoid 1 RF Cavity and Coupling Coil (RFCC) Module Spectrometer Solenoid 2  Flexure style tuner design  Push-pull pneumatic actuator  Electronically controlled actuator action  6 tuner/actuator assemblies are being fabricated for testing the full system on a cavity  Electro-polish will be done to the high-field surfaces of the cavity.  Mechanical polishing the inside surfaces will precede the electro-polish.  The cavity will be set-up to rotate with electro-polish fluid on the inside of the cavity.  A “U” shaped electrode will be on inside of cavity Cavity Electropolishing Coupling Coil  First coil winding is complete (Qi Huan Corp., Beijing, China)  Mandrels and cover plates for coils 2 and 3 fabricated  Cryostat design is complete (SINAP, Shanghai, China)  Cooling system design incorporating three cryocoolers is complete (SINAP, Shanghai, China)