Progress on MICE RFCC ModuleProgress on MICE RFCC Module for the for the MICE ExperimentMICE Experiment**

Allan DeMelloAllan DeMello, Nord Andresen, , Nord Andresen, Michael Green, Derun Li, Heng Pan, Steve Virostek, Michael Zisman (LBNL, Berkeley CA Michael Green, Derun Li, Heng Pan, Steve Virostek, Michael Zisman (LBNL, Berkeley CA 94720, USA),94720, USA),

Don Summers, Mike Reep (University of Mississippi, Oxford MS 38677, 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), 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)Yun Cao, Sen Sun, Li Wang, Lixin Yin (SINAP, Shanghai, China)on behalf of the MICE Collaborationon behalf of the MICE Collaboration

AbstractThis 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 Dynamic RF Cavity TunerTuner

The RF Cavity: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. * This work was supported by the Office of Science, U.S. Department of Energy under DOE contract number DE-AC02-Department of Energy under DOE contract number DE-AC02-05CH11231.05CH11231.

Layout of the International Muon Ionization Cooling Experiment (MICE)

at Rutherford Appleton Laboratory, UK

Single Cavity VesselSingle Cavity VesselPrior to having the MICE RFCC module, the single cavity vessel will allow us to:Check engineering and mechanical designTest of the RF tuning system with 6 tuners on a cavity and verify the frequency tuning rangeObtain 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 ModuleRFCC ModuleThe RFCC integrates four normal conducting RF cavities with a superconducting solenoid magnet

Superconducting Superconducting Coupling CoilCoupling Coil

Cavity RF Couplers

Cavity RF Couplers

201-MHz RF cavity201-MHz RF cavity

Getter Vacuum PumpGetter Vacuum PumpModule supportModule support

Remaining tasks: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

Liquid Hydrogen Absorber and Focusing Coil

(AFC) Module(AFC) Module

SpectrometerSpectrometer

Solenoid 1Solenoid 1

RF Cavity and Coupling

RF Cavity and Coupling

Coil (RFCC) Module

Coil (RFCC) Module

SpectrometerSpectrometer

Solenoid 2Solenoid 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 ElectropolishingCavity Electropolishing

Coupling CoilCoupling CoilFirst 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)