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York, R.C.

Paper Title Page
MOP030 Multiple User Beam Distribution System for FRIB Driver Linac 130
  • D. Gorelov, V. Andreev, S. Chouhan, X. Wu, R.C. York
    NSCL, East Lansing, Michigan

Funding: Work was supported by DOE grant DE-FG02-04ER41324
The proposed Facility for Radioactive Ion Beams (FRIB)* will deliver up to 400 kW of any stable isotope to multi-target experimental complex. Operational efficiency will be best served by a system that can distribute the beam current, variable in a large dynamic range, to several independent targets simultaneously. The proposed FRIB Beam Switchyard (BSY) utilizes an rf kicker with subsequent magnetostatic septum system to split the beam on micro-bunch to micro-bunch basis. The micro-bunches can be differentially loaded at the front-end of the Driver Linac**. The detailed analysis of the beam dynamics performance in the proposed BSY system is presented.

*D.Gorelov, et al, proc of EPAC 2002, Paris, France, 2002.
**M. Doleans, et al, LINAC 2006, Knoxville, TN, USA, 2006.

MOP056 The Status of the MSU Re-Accelerator (ReA3) 205
  • X. Wu, S. Chouhan, C. Compton, M. Doleans, W. Hartung, D. Lawton, G. Machicoane, F. Marti, P.S. Miller, J. Ottarson, M. Portillo, R.C. York, A. Zeller, Q. Zhao
    NSCL, East Lansing, Michigan

The Re-accelerator being developed at the Michigan State University is a major component of a novel system proposed at the NSCL to first stop the high energy RIBs by the in-flight particle fragmentation method in a helium filled gas system, then increase their charge state with an Electron Beam Ion Trap (EBIT) charge breeder, and finally re-accelerate them to about 3 MeV/u, in order to provide opportunities for an experimental program ranging from low-energy Coulomb excitation to transfer reaction studies of astrophysical reactions. The accelerator system consists of a Low Energy Beam Transport (LEBT) with an external multi-harmonic buncher, a radio frequency quadrupole (RFQ) followed by a superconducting linac and a High Energy Beam Transport (HEBT). The superconducting linac will use quarter-wave resonators with bopt of 0.047 and 0.085 for acceleration and superconducting solenoid magnets for transverse focusing. The paper will discuss the recent progress of R&D and beam dynamics studies for the MSU Re-accelerator.

THP033 Superconducting Quarter-Wave Resonator Cavity and Cryomodule Development for a Heavy Ion Re-accelerator 854
  • W. Hartung, J. Bierwagen, S. Bricker, C. Compton, J. DeLauter, P. Glennon, M. Hodek, M.J. Johnson, F. Marti, P.S. Miller, D. Norton, J. Popielarski, L. Popielarski, D. Sanderson, J. Wlodarczak, R.C. York
    NSCL, East Lansing, Michigan
  • A. Facco
    INFN/LNL, Legnaro, Padova
  • E.N. Zaplatin
    FZJ, Jülich

A superconducting linac is being planned for re-acceleration of exotic ions produced by the Coupled Cyclotron Facility at Michigan State University. The re-accelerator will include a gas stopper, a charge breeder, a normal conducting radio-frequency quadrupole, and two types of superconducting quarter-wave resonators (QWRs) for re-acceleration to energies of up to 3 MeV per nucleon initially, with a subsequent upgrade path to 12 MeV per nucleon. The QWRs (80.5 MHz, optimum beta = 0.041 and 0.085, made from bulk niobium) are similar to existing cavities presently used at INFN-Legnaro. The re-accelerator's cryomodules will accommodate up to 8 cavities, along with superconducting solenoids for focussing. Active and passive shielding is required to ensure that the solenoids' field does not degrade the cavity performance. First prototypes of both QWR types have been fabricated and tested. A prototype solenoid has been procured and tested. A test cryomodule has been fabricated: one QWR, one solenoid, and two other beam line elements have been installed inside. This paper will cover the re-accelerator cavity and cryomodule prototyping efforts, results so far, and future plans.


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