Progress on the MICE RFCC Module for the MICE Experiment

PROGRESS ON MICE RFCC MODULE FOR THE MICE EXPERIMENT* Allan DeMello, Nord Andresen, Michael Green, Derun L i , Heng Pan, Steve Virostek, Michael Zisman ( L B N L , Berkeley C A 94720, USA), Don Summers, Mike Reep (University of Mississippi, Oxford M S 38677, USA) An Bin Chen, Xiao-Kun Liu, Feng-Yu X u , Shi-Xian Zheng (HIT, Harbin, China), Yun Cao, Sen Sun, L i Wang, Lixin Y i n (SINAP, Shanghai, China) Abstract We describe the recent progress on the design and fabrication of the R F C C (RF and Coupling Coil) module for the international Muon Ionization Cooling Experiment (MICE). The M I C E cooling channel has two R F C C modules; each has four 201-MHz normal conducting R F cavities and one superconducting solenoid magnet. The magnet is designed to be cooled by three cryocoolers. Fabrication of the R F cavities is complete; design and fabrication of the magnets are in progress. The first magnet is expected to be finished by the end of 2011. pneumatic actuator (Fig. 3). Six flexure tuners are currently being fabricated (University of Mississippi) for a full cavity test of the R F tuner system. This test will include the electronic pressure control, EPICS software interface and the R F feedback system. This system will be assembled into a single cavity vacuum vessel (see below) for testing. INTRODUCTION M I C E is an international experiment designed to demonstrate muon beam cooling using ionization cooling (Fig. 1). Muons are captured in a strong magnetic field, cooled in 4D phase space and re-accelerated in the beamline direction by the normal conducting R F cavities in the R F C C . This demonstration is key to the success of a future Neutrino Factory or Muon Collider. The experiment is being hosted at Rutherford Appleton Laboratory ( R A L ) in the U K , where beamline commissioning is underway. Institutions participating in the collaboration include national laboratories and universities in Europe, the U.S., China, and Japan. Figure 2: 90° sectioned view of the M I C E cooling channel R F C C module. Figure 1 : The M I C E cooling channel. RFCC M O D U L E CAVITIES Lawrence Berkeley National Laboratory is responsible for the design of the R F Cavity and Coupling Coil (RFCC) module for M I C E (Fig. 2). Each R F C C module will contain four 201 M H z normal conducting R F cavities and one superconducting coupling coil magnet [4]. Each cavity will have its frequency actively tuned using six stainless steel flexure tuners moved with a dual action * This work was supported by the Office of Science, U.S. Department of Energy under D O E contract number DE-AC02-05CH11231. Figure 3: The prototype RF tuner flexure and actuator mounted on a 201-MHz cavity.