• O.K. Kester, D. Bazin, C. Benatti, J. Bierwagen, G. Bollen, S. Bricker, S. Chouhan, C. Compton, A.C. Crawford, K.D. Davidson, J. DeLauter, M. Doleans, L.J. Dubbs, K. Elliott, W. Hartung, M.J. Johnson, S.W. Krause, A. Lapierre, F. Marti, J. Ottarson, G. Perdikakis, J. Popielarski, L. Popielarski, M. Portillo, R. Rencsok, D.P. Sanderson, S. Schwarz, N. Verhanovitz, J.J. Vincent, J. Wlodarczak, X. Wu, J. Yurkon, A. Zeller, Q. Zhao
  NSCL, East Lansing, Michigan
• A. Schempp, J.S. Schmidt
  IAP, Frankfurt am Main

Rare isotope beam (RIB) accelerator facilities provide rich research opportunities in nuclear physics. The National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU) is constructing a RIB facility, called ReA3. It will provide unique low-energy rare isotope beams by stopping fast RIBs and reaccelerating them in a compact linac. ReA3 comprises gas stopper systems, an Electron Beam Ion Trap (EBIT) charge state booster, a room temperature radio frequency quadrupole (RFQ), a linac using superconducting quarter wave resonators (QWRs) and an achromatic beam transport and distribution line to the new experimental area. Beams from ReA3 will range from 3 MeV/u for heavy ions to about 6 MeV/u for light ions, as the charge state of the ions can be adjusted by the EBIT. ReA3 will initially use beams from NSCL's Coupled Cyclotron Facility (CCF). Later ReA3 will provide reacceleration capability for the Facility for Rare Isotope Beams (FRIB), a new national user facility funded by the Department of Energy (DOE) that will be hosted at MSU. The ReA3 concept and status of ReA3 will be presented, with emphasis on the comissioning of the facility, which is underway.

Slides

• J. Popielarski, J. Bierwagen, S. Bricker, S. Chouhan, C. Compton, J. DeLauter, K. Elliott, P. Glennon, W. Hartung, M. Hodek, M.J. Johnson, O.K. Kester, F. Marti, S.J. Miller, D. Morris, D. Norton, L. Popielarski, D.P. Sanderson, N.R. Usher, N. Verhanovitz, J.J. Vincent, J. Wlodarczak, R.C. York
  NSCL, East Lansing, Michigan

Michigan State University is developing cryomodules for two projects: a 3 MeV per nucleon superconducting linac for re-acceleration of exotic ions (ReA3, under construction, requiring 4 cryomodules), and a 200 MeV per nucleon driver linac for the Facility for Rare Isotope Beams (FRIB, under design, requiring 52 cryomodules). The first two ReA3 cryomodules contain a total of seven quarter-wave resonators for beta = 0.041 and five superconducting solenoids (9 T). These cryomodules have been fabricated and installed, with testing underway. The third ReA3 cryomodule (requiring eight QWRs for beta = 0.085 and three solenoids) is being fabricated. A fourth ReA3 module consisting of a single quarter-wave resonator will be used for matching. A prototype cryomodule for FRIB is being designed for two beta = 0.53 half-wave resonators and one solenoid. The experience so far with system performance of the cryomodules will be described in this paper. Topics will include cavity performance, magnetic shielding, microphonics, cavity tuning, input coupler performance, and thermal loads.