PAC2013 - List of Authors (Chouhan, S.)

Paper	Title	Page
MOPMA07	The D-Line Project at Michigan State University	309
	J.A. Rodriguez, S. Chouhan, W. Wittmer FRIB, East Lansing, Michigan, USA S. Chouhan, A. Lapierre, D. Leitner, G. Perdikakis, M. Portillo, S. Schwarz, M. Steiner, C. Sumithrarachchi, S.J. Williams, X. Wu NSCL, East Lansing, Michigan, USA
	Funding: Work supported by Michigan State University (MSU) and the National Science Foundation (NSF) The Coupled Cyclotron Facility (CCF) at Michigan State University (MSU) has been used to produce rare isotope beams for more than a decade. Ions produced by an ECR source are accelerated using two superconducting cyclotrons in tandem with a stripper foil in between to boost their charge state. After the second cyclotron, a target and a fragment separator produce and select the rare isotope beam that is sent to the different experimental vaults. A gas stopper can be used to thermalize the beam before sending it to a low energy experimental area or to a charge breeder before the ReA re-accelerator. The D-line project includes a mass separator after the gas stopper and several beam transfer lines that connect it to the low energy experiments and to the charge breeder. In this paper, we will describe the project and give an update of its status including the results of the commissioning.

THPBA12	Progress on the MSU Superferric Cyclotron Gas Stopper Magnet Quench Protection and Cooling System	1253
	M.A. Green, G. Bollen, S. Chouhan, A. Zeller FRIB, East Lansing, Michigan, USA J. DeKamp, D. Lawton, C. Magsig, D.J. Morrissey, J. Ottarson, S. Schwarz NSCL, East Lansing, Michigan, USA
	Funding: The material in this paper is based on work supported in part by a grant from the National Science Foundation. The MSU grant number is PHY-0958726. The MSU gas cyclotron stopper system is designed to decelerate rare isotope ions from energies from a few MeV to energies in the 10 keV range. The ions are decelerated in low pressure helium gas in vertical cyclotron magnet. The magnet and the system for decelerating the ions is mounted on a high voltage platform. The cyclotron gas stopper magnet is a warm iron superconducting cyclotron sector dipole. The maximum field in the gap (0.18m) is 2.75 T. The outer diameter of magnet yoke is 3.8m, with a pole radius of 1.1 m and Br = 1.8 T m. The desired field shape is obtained by the pole profile. Each coil of the two halves is in a separate cryostat and connected in series through a warm electrical connection. The entire system is mounted on a high voltage platform, and will be cooled by six two-stage 4.2 K pulse tube coolers. The magnet coils and their cryostats have been fabricated. The iron poles have been machined and assembled. This paper presents the progress on the magnet system fabrication and assembly

Paper

Title

Page

The D-Line Project at Michigan State University

309

J.A. Rodriguez, S. Chouhan, W. Wittmer
FRIB, East Lansing, Michigan, USA
S. Chouhan, A. Lapierre, D. Leitner, G. Perdikakis, M. Portillo, S. Schwarz, M. Steiner, C. Sumithrarachchi, S.J. Williams, X. Wu
NSCL, East Lansing, Michigan, USA

Funding: Work supported by Michigan State University (MSU) and the National Science Foundation (NSF)
The Coupled Cyclotron Facility (CCF) at Michigan State University (MSU) has been used to produce rare isotope beams for more than a decade. Ions produced by an ECR source are accelerated using two superconducting cyclotrons in tandem with a stripper foil in between to boost their charge state. After the second cyclotron, a target and a fragment separator produce and select the rare isotope beam that is sent to the different experimental vaults. A gas stopper can be used to thermalize the beam before sending it to a low energy experimental area or to a charge breeder before the ReA re-accelerator. The D-line project includes a mass separator after the gas stopper and several beam transfer lines that connect it to the low energy experiments and to the charge breeder. In this paper, we will describe the project and give an update of its status including the results of the commissioning.

THPBA12

Progress on the MSU Superferric Cyclotron Gas Stopper Magnet Quench Protection and Cooling System

1253

M.A. Green, G. Bollen, S. Chouhan, A. Zeller
FRIB, East Lansing, Michigan, USA
J. DeKamp, D. Lawton, C. Magsig, D.J. Morrissey, J. Ottarson, S. Schwarz
NSCL, East Lansing, Michigan, USA

Funding: The material in this paper is based on work supported in part by a grant from the National Science Foundation. The MSU grant number is PHY-0958726.
The MSU gas cyclotron stopper system is designed to decelerate rare isotope ions from energies from a few MeV to energies in the 10 keV range. The ions are decelerated in low pressure helium gas in vertical cyclotron magnet. The magnet and the system for decelerating the ions is mounted on a high voltage platform. The cyclotron gas stopper magnet is a warm iron superconducting cyclotron sector dipole. The maximum field in the gap (0.18m) is 2.75 T. The outer diameter of magnet yoke is 3.8m, with a pole radius of 1.1 m and Br = 1.8 T m. The desired field shape is obtained by the pole profile. Each coil of the two halves is in a separate cryostat and connected in series through a warm electrical connection. The entire system is mounted on a high voltage platform, and will be cooled by six two-stage 4.2 K pulse tube coolers. The magnet coils and their cryostats have been fabricated. The iron poles have been machined and assembled. This paper presents the progress on the magnet system fabrication and assembly