Beam Dynamics Studies of ECR Injections for the Coupled Cyclotron Facility at NSCL

X.Wu; D.Cole; M.Doleans; G.Machicoane; F.Marti; P.Miller; J.Stetson; <BR>M.Steiner; P.Zavodszky; Q.Zhao

Chinese Physics C> 2007, Vol. 31> Issue(S1) : 196-200

Beam Dynamics Studies of ECR Injections for the Coupled Cyclotron Facility at NSCL

National Superconducting Cyclotron Laboratory, Michigan State University,East Lansing, MI 48824, USA

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Abstract：
The Coupled Cyclotron Facility (CCF) has been operating at the NSCL since 2001, providing up to 160MeV/u heavy ion beams for nuclear physics experiments. Recent steps, particularly the improvement of the ECR-to-K500 injection line, were taken to improve the CCF performance. For that purpose an off-line ECR source, ARTEMIS-B, was built and used to investigate the impact on beam brightness under various source operating conditions, different initial focusing systems and current analysis dipole. Beam dynamics simulations including space-charge and 3D electrostatic field effects were performed and beam diagnostics including emittance scanner were used, leading to a better understanding of the CCF beam injection process. New initial electrostatic focusing elements such as a large-bore quadrupole triplet and a quadrupole double-doublet with compensating octupole were tested, and a new beam tuning procedure was established to improve the beam brightness for the CCF. Following these efforts, a significant increase of primary beam power out of the CCF has been achieved.

References

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. Závodszky P A et al. HEP NP, 2007, 31(Suppl.Ⅰ): 18(in Chinese)(Závodszky P A 等. 高能物理与核物理, 2007, 31(增刊Ⅰ):18)br2. Machicoane G, Cole D, Ottarson J et al. Rev. Sci. Instr.,2006, 77: 03A3223. Machicoane G et al. HEP NP, 2007, 31(Suppl.Ⅰ): 187(in Chinese)(Machicoane G 等.高能物理与核物理, 2007, 31(增刊Ⅰ):187)4. Stetson J W, Machicoane G, Miller P et al. Experimental Studies of Electrostatic and Solenoidal Focusing of Low Energy Heavy Ion ECRIS beams at NSCL/MSU, proceedings of the XXIII Linac Conference, Knoxville, Tennessee, August 20065. Kazarinov N Yu. Rev. Sci. Instr., 2004, 75: 16656. ZHAO Q, Balabin A, Marti F et al. Simulations of Solenoid and Electrostatic Quadrupole Focusing of High Intensity Beams from ECR Ion Source, proceedings of PAC 2005,Knoxville, Tennessee, May 20057. Baartman R. Aberrations in Electrostatic Quadrupoles, TRI-DN-95-21, TRIUMF, June 19998. Spaedtke P. KOBRA3-INP, 2005

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X.Wu, D.Cole, M.Doleans, G.Machicoane, F.Marti, P.Miller, J.Stetson,
M.Steiner, P.Zavodszky and Q.Zhao. Beam Dynamics Studies of ECR Injections for the Coupled Cyclotron Facility at NSCL[J]. Chinese Physics C, 2007, 31(S1): 196-200.

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Received: 2007-05-30
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Beam Dynamics Studies of ECR Injections for the Coupled Cyclotron Facility at NSCL

Corresponding author: X.Wu,

National Superconducting Cyclotron Laboratory, Michigan State University,East Lansing, MI 48824, USA

Received Date: 2007-05-30
Accepted Date: 1900-01-01
Available Online: 2007-01-03

Abstract: The Coupled Cyclotron Facility (CCF) has been operating at the NSCL since 2001, providing up to 160MeV/u heavy ion beams for nuclear physics experiments. Recent steps, particularly the improvement of the ECR-to-K500 injection line, were taken to improve the CCF performance. For that purpose an off-line ECR source, ARTEMIS-B, was built and used to investigate the impact on beam brightness under various source operating conditions, different initial focusing systems and current analysis dipole. Beam dynamics simulations including space-charge and 3D electrostatic field effects were performed and beam diagnostics including emittance scanner were used, leading to a better understanding of the CCF beam injection process. New initial electrostatic focusing elements such as a large-bore quadrupole triplet and a quadrupole double-doublet with compensating octupole were tested, and a new beam tuning procedure was established to improve the beam brightness for the CCF. Following these efforts, a significant increase of primary beam power out of the CCF has been achieved.