Ion beam capture and charge breeding in electron cyclotron resonance ion source plasmas

被引:7
作者
Kim, Jin-Soo [1 ]
Zhao, L.
Cluggish, B. P.
Pardo, Richard
机构
[1] Far Tech Inc, San Diego, CA 92121 USA
[2] Argonne Natl Lab, Argonne, IL 60439 USA
关键词
D O I
10.1063/1.2785844
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Beam capture of injected ions and charge breeding in electron cyclotron resonance (ECR) charge breeder ion source plasmas has been investigated utilizing an ECR plasma modeling code, the generalized ECR ion source model, and a Monte Carlo beam capture code. Beam capturing dynamics, charge breeding in the plasma, and the extracted charged ion states are described. Optimization of ion beam energy is performed for (1) high beam capture efficiency and (2) high charge state ion beam extractions. A sample case study for ANL-ECR has been performed. Ions entering ECR ion source plasma are slowed down mostly by the background ions. Assuming Maxwellian plasma ions, maximum beam energy loss occurs when the beam velocity is around the background thermal velocity in magnitude. It is also found that beam capture location affects charge state distribution. For instance, with a majority of beam ions captured near the middle of the device higher currents for higher charge states are obtained. The beam ions captured near the entry have a higher probability of backstreaming after they are captured. For this reason, the optimum beam energy of the injected Ar+ beam ions for charge breeding is generally higher than the optimum input beam energy for maximum beam energy loss. (C) 2007 American Institute of Physics.
引用
收藏
页数:9
相关论文
共 17 条
[1]   Charge state breeding of radioactive ions with an electron cyclotron resonance ion source at TRIUMF [J].
Ames, F. ;
Baartman, R. ;
Bricault, P. ;
Jayamanna, K. ;
McDonald, M. ;
Olivo, M. ;
Schmor, P. ;
Yuan, D. H. L. ;
Lamy, T. .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2006, 77 (03)
[2]   PARTICLE-IN-CELL CHARGED-PARTICLE SIMULATIONS, PLUS MONTE-CARLO COLLISIONS WITH NEUTRAL ATOMS, PIC-MCC [J].
BIRDSALL, CK .
IEEE TRANSACTIONS ON PLASMA SCIENCE, 1991, 19 (02) :65-85
[3]   Monte Carlo collision operators for use with exact trajectory integrators [J].
Boozer, AH .
PHYSICS OF PLASMAS, 2002, 9 (10) :4389-4391
[4]   MONTE-CARLO EVALUATION OF TRANSPORT-COEFFICIENTS [J].
BOOZER, AH ;
KUOPETRAVIC, G .
PHYSICS OF FLUIDS, 1981, 24 (05) :851-859
[5]   Model of accumulation, multi-ionization, and extraction of ions in ECR ion sources [J].
Cavenago, M ;
Kester, O ;
Lamy, T ;
Sortais, P .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2002, 73 (02) :537-540
[6]  
DIVER D, 2001, PLASMA FORMULARY PHY
[7]   Electron cyclotron resonance ion source one-dimensional fluid modeling [J].
Edgell, DH ;
Kim, JS ;
Bogatu, IN ;
Pardo, RC ;
Vondrasek, RC .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2002, 73 (02) :641-643
[8]  
EDGELL DH, 2001, P PART ACC C CHIC JU
[9]   Charge breeding of isotope on-line-created radioactive ions using an electron cyclotron resonance ion trap [J].
Geller, R ;
Lamy, T ;
Sortais, P .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2006, 77 (03)
[10]  
Goldston R., 2003, INTRO PLASMA PHYS