ECRIS2012 - List of Keywords (sextupole)

Paper	Title	Other Keywords	Page
WEPP13	Development Update of the LECR4 Ion Source - Dragon at IMP	ion, ion-source, ECR, extraction	133
	W. Lu, B.H. Ma, L.T. Sun, H. Wang, D. Xie, X.Z. Zhang, H.W. Zhao IMP, Lanzhou, People's Republic of China L. Ruan, B. Xiong IEE, Beijing, People's Republic of China
	A new room temperature ECR ion source, LECR4-DRAGON to operate at 18 GHz, is under development for the SSC-LINAC project at IMP. In comparison to other room temperature ECRISs, one unique feature of LECR4-DRAGON is that its plasma chamber is of ID 126 mm that is the biggest chamber for a room temperature ECRIS and the same as the superconducting ECR ion source SECRAL. Because the project funding requests testing a different magnet cooling scheme, solid quadrate copper coils cooled by medium evaporation at about 50^oC are to be used to produce a maximum axial magnetic field of about 2.5 T at injection and 1.4 T at the extraction, which are similar to SECRAL operating at 18 GHz. Furthermore, a large bore non-Halbach permanent sextupole with staggered structure has been under fabrication which can produce a radial magnetic field reaching 1.5 T at the plasma chamber wall for operation at 18 GHz. The progress updates and discussions of this new ion source will be presented in this paper.

THXO01	Optimization of the New SC Magnetic Structure Design with a Hybrid Magnet	injection, solenoid, ECRIS, plasma	149
	D. Xie, W. Lu, L.Z. Ma, L.T. Sun, X.Z. Zhang, H.W. Zhao, L. Zhu IMP, Lanzhou, People's Republic of China
	In the development of the next generation ECRISs, so far either a set of full NbTi or full Nb₃Sn magnets has been proposed to construct the magnet system. However, the single set of magnets may not be the optimum in terms of the field strength and configuration. An optimization of the new SC magnetic structure with a set of hybrid magnets (NbTi and Nb₃Sn) is being investigated. With the hybrid magnet the optimized new magnetic system is capable of producing field maxima of 9.0 T on axis and 4.0 T at the plasma wall, which are 30 and 10% higher than the previously proposed magnetic structure to be built with a set of full NbTi magnets. In addition, the axial length of the optimized magnetic structure has been slightly shrunk resulting in a more compact system. This new magnetic field profile is high enough for operation frequency up to 56 GHz. The design features and the preliminary force/stress analyses of the optimized new SC magnetic structure will be presented and discussed.
	Slides THXO01 [2.603 MB]

THYO03	Design Status of ECR Ion Sources and LEBT for FRIB	ion, ion-source, ECR, solenoid	172
	G. Machicoane, N.K. Bultman, G. Morgan, E. Pozdeyev, X. Rao FRIB, East Lansing, Michigan, USA J.Y. Benitez, C.M. Lyneis LBNL, Berkeley, California, USA L.T. Sun IMP, Lanzhou, People's Republic of China
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams at Michigan State University is currently being designed and will provide intense beams of rare isotopes for research in nuclear physics, nuclear astrophysics and study of fundamental interactions. The FRIB driver linac will accelerate all stable isotopes from Oxygen to Uranium to energies beyond 200 MeV/u at beam powers up to 400 kW. In the case of Uranium about 13.3 pμA of U³³⁺ are required from the ion source to reach the maximum beam power on the target. Such current is at the limit of what an ECR ion source can produce and led us to design the FRIB driver linac to accelerate concurrently two charges. The ECR ion source for FRIB will be based on the VENUS ion source developed at Lawrence Berkeley National Laboratory (LBNL). Recent beam measurements done with VENUS have demonstrated that the ion source can actually produce close to 13pμA of U³³⁺ and therefore could possibly meet the current required for FRIB in one charge state. This paper reviews the status of the FRIB ECR ion source and the modifications that have been made to the VENUS ion source design. The Low energy beam line transport (LEBT) will also be presented and discussed.
	Slides THYO03 [6.532 MB]

Paper

Title

Other Keywords

Page

WEPP13

Development Update of the LECR4 Ion Source - Dragon at IMP

ion, ion-source, ECR, extraction

133

W. Lu, B.H. Ma, L.T. Sun, H. Wang, D. Xie, X.Z. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China
L. Ruan, B. Xiong
IEE, Beijing, People's Republic of China

A new room temperature ECR ion source, LECR4-DRAGON to operate at 18 GHz, is under development for the SSC-LINAC project at IMP. In comparison to other room temperature ECRISs, one unique feature of LECR4-DRAGON is that its plasma chamber is of ID 126 mm that is the biggest chamber for a room temperature ECRIS and the same as the superconducting ECR ion source SECRAL. Because the project funding requests testing a different magnet cooling scheme, solid quadrate copper coils cooled by medium evaporation at about 50^oC are to be used to produce a maximum axial magnetic field of about 2.5 T at injection and 1.4 T at the extraction, which are similar to SECRAL operating at 18 GHz. Furthermore, a large bore non-Halbach permanent sextupole with staggered structure has been under fabrication which can produce a radial magnetic field reaching 1.5 T at the plasma chamber wall for operation at 18 GHz. The progress updates and discussions of this new ion source will be presented in this paper.

THXO01

Optimization of the New SC Magnetic Structure Design with a Hybrid Magnet

injection, solenoid, ECRIS, plasma

149

D. Xie, W. Lu, L.Z. Ma, L.T. Sun, X.Z. Zhang, H.W. Zhao, L. Zhu
IMP, Lanzhou, People's Republic of China

In the development of the next generation ECRISs, so far either a set of full NbTi or full Nb₃Sn magnets has been proposed to construct the magnet system. However, the single set of magnets may not be the optimum in terms of the field strength and configuration. An optimization of the new SC magnetic structure with a set of hybrid magnets (NbTi and Nb₃Sn) is being investigated. With the hybrid magnet the optimized new magnetic system is capable of producing field maxima of 9.0 T on axis and 4.0 T at the plasma wall, which are 30 and 10% higher than the previously proposed magnetic structure to be built with a set of full NbTi magnets. In addition, the axial length of the optimized magnetic structure has been slightly shrunk resulting in a more compact system. This new magnetic field profile is high enough for operation frequency up to 56 GHz. The design features and the preliminary force/stress analyses of the optimized new SC magnetic structure will be presented and discussed.

Slides THXO01 [2.603 MB]

THYO03

Design Status of ECR Ion Sources and LEBT for FRIB

ion, ion-source, ECR, solenoid

172

G. Machicoane, N.K. Bultman, G. Morgan, E. Pozdeyev, X. Rao
FRIB, East Lansing, Michigan, USA
J.Y. Benitez, C.M. Lyneis
LBNL, Berkeley, California, USA
L.T. Sun
IMP, Lanzhou, People's Republic of China

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams at Michigan State University is currently being designed and will provide intense beams of rare isotopes for research in nuclear physics, nuclear astrophysics and study of fundamental interactions. The FRIB driver linac will accelerate all stable isotopes from Oxygen to Uranium to energies beyond 200 MeV/u at beam powers up to 400 kW. In the case of Uranium about 13.3 pμA of U³³⁺ are required from the ion source to reach the maximum beam power on the target. Such current is at the limit of what an ECR ion source can produce and led us to design the FRIB driver linac to accelerate concurrently two charges. The ECR ion source for FRIB will be based on the VENUS ion source developed at Lawrence Berkeley National Laboratory (LBNL). Recent beam measurements done with VENUS have demonstrated that the ion source can actually produce close to 13pμA of U³³⁺ and therefore could possibly meet the current required for FRIB in one charge state. This paper reviews the status of the FRIB ECR ion source and the modifications that have been made to the VENUS ion source design. The Low energy beam line transport (LEBT) will also be presented and discussed.

Slides THYO03 [6.532 MB]