High Intensity Ion Beam Extraction System for FECR

High Intensity Ion Beam Extraction System for FECR Zhen Shen L. T. Sun, X. Z. Zhang, W. Lu, Y. Yang, X. Fang, J. W. Guo, Z. H. Jia, Y. G. Liu, H. W. Zhao Institute of Modern Physics (IMP), Chinese Academy of Sciences

FECR: the 4 th Gen ECRIS Beam Distribution for Extraction Simulation Highest Ion Beam Intensity (em. A) Emittance(π·mm·mrad) Energy Spread 20~60 20 em. A U 2, 0 1, 5 2, 0 1, 8 1, 6 1, 4 1, 2 1, 0 0, 5 1, 1 0, 8 0, 9 0, 7 0, 5 0, 4 0, 3 0, 2 0, 1 15 16 60 em. A O 14 12 12 9 10 8 6 6 4 2 0 2020/09/30 1, 8 1, 7 0, 0 >10. 0(16 O 6+) >2. 0(78 Kr 19+) >1. 5(129 Xe 26+) >1. 0(238 U 35+) 2, 5 O 3 U 3 + 9 U 3 + 8 U 3 + 7 U 3 + 6 U 3 + 5 U 3 + 4 U 3 + 3 U 3 + 2 U 3 + 1 U 3 + 0+ O 2 U 2 + 9 U 2 + 8 U 2 + 7 U 2 + 6 U 2 + 5 U 2 + 4 U 2 + 3 U 2 + 2+ Total Drain Current (em. A) 50(max) Beam Intensity (em. A) Extraction Voltage (k. V) Beam Intensity (em. A) 3, 0 Beam Requirements for FECR 4, 5 3 1, 5 H+ O 8+ O 7+ O 6+ C 4+ O 5+ O 4+ C 3+ O 3+ C 2+ O 1+ 0, 75 1, 5 Ref: L. Sun, et al. Intense Beam Production of Highly Charged Ions by the Superconducting ECR Ion Source SECRAL for Heavy Ion Linacs. 0, 75 2

FECR: 4 -electrode Extraction System 3 -electrode Extraction for SECRAL 4 -electrode Extraction for FECR G 1 Plasma Suppressor Ground ~20 k. V -1~-2 k. V 0 G 2 G 3 Plasma Middle Suppressor Ground 50 k. V V 1 V 2 0 Movable Electrodes 2020/09/30 3

IBSIMU: G 1= 20~47 mm_V 1= 23 k. V(U) All Particles X Emittance All Particles Y Emittance U 35+ Beam Quality at the End of Extraction (200 mm) 2020/09/30 Ref: Kalvas T, et al. IBSIMU: A three-dimensional simulation software for charged particle optics[J]. 4

Optimizing G 1&V 1 U 35+ Exponential O 6+ k? 2020/09/30 k: Optimal Generalized Perveance 5

Optimizing G 2 U 35+ 2020/09/30 O 6+ 6

TOSCA: Electric Field Analysis G 1=35 mm V 1=25 k. V G 2=25 mm G 3=6 mm Emax≈5. 0 k. V/mm 2020/09/30 G 1=35 mm V 1=25 k. V G 2=28 mm G 3=8 mm Emax≈2. 9 k. V/mm 7

Conclusion 2020/09/30 8

Appendix: U Beam V 2&G 3 2020/09/30 9

Appendix: 3 -electrode for O Beam G 1=35 mm Emax≈5. 5 k. V/mm 2020/09/30 10