Marti F.

Paper	Title	Page
MO304	MSU Re-accelerator - the re-acceleration of low energy RIBS at the NSCL	28
	X. Wu, G. Bollen, M. Doleans, T. L. Grimm, W. Hartung, F. Marti, S. Schwarz, R. C. York, Q. Zhao MSU/NSCL
	The in-flight Particle Fragmentation (PF) method for producing Rare Isotope Beams (RIBs) has been used at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU) since 1989. The upgraded Coupled Cyclotron Facility (CCF) has been in operation for nuclear physics research since 2001 with the experimental program largely utilizing PF produced RIBs. To provide new research opportunities for an experimental program ranging from low-energy coulomb excitation to transfer reaction studies of astrophysical reactions, a novel system is proposed at the NSCL to first stop the high energy RIBs 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 using a radio frequency quadrupole (RFQ) followed by a superconducting linac. The superconducting linac will use quarter-wave resonators with optimum beta (beta_opt = beta value for which the cavity delivers the maximum accelerating voltage) of 0.041 and 0.085 for acceleration, and superconducting solenoid magnets for transverse focusing. An upgrade option to achieve a beam energy up to ~12 MeV/u with additional accelerating cryomodules is also possible. This paper will discuss the accelerator system design and beam dynamics simulations for the MSU Re-accelerator project.
	Slides(PDF)
TUP67	Niobium Quarter-Wave Resonator Development for a Heavy Ion Re-accelerator	296
	W. Hartung, J. Bierwagen, S. Bricker, C. Compton, T. Grimm, M. Johnson, F. Marti, J. Popielarski, L. Saxton, R. C. York Michigan State University A. Facco INFN-LNL E. Zaplatin FZ Juelich
	A superconducting linac is being designed for reacceleration of exotic ions produced by the Coupled Cyclotron Facility at Michigan State University (MSU). The re-accelerator beam line will include a cyclotron gas stopper, a charge breeder, a normal conducting radio-frequency quadrupole, and two types of superconducting quarterwave resonators (QWRs) for re-acceleration to energies of up to 3 MeV per nucleon, with the option of additional acceleration to 12 MeV per nucleon as a future upgrade. Both QWR types are based on existing cavities that are presently used at INFN-Legnaro. The second QWR (optimum beta = 0.085, 80.5 MHz) was previously designed and prototyped as a collaborative effort between Legnaro and MSU. The first QWR (optimum beta = 0.041, 80.5 MHz) is very similar to the corresponding QWR in use at Legnaro, but with a larger beam aperture. Separation between the cavity vacuum and the cryostat insulation vacuum is also implemented to reduce the risk of particulate contamination. Structural analysis of the QWRs is being done in collaboration with FZ Juelich. The beta = 0.041 QWR design and prototyping effort is discussed in this paper.