Production of high intensity high charge state uranium ion beams in afterglow mode with advanced electron cyclotron resonance (ECR) ion sources

L X Li; J B Li; J D Ma; Y C Feng; Z H Zhang; W H Zhang; D Hitz; H Y Ma; X Y Wang; W Lu; L T Sun; H W Zhao

doi:10.1063/5.0238136

Production of high intensity high charge state uranium ion beams in afterglow mode with advanced electron cyclotron resonance (ECR) ion sources

Rev Sci Instrum. 2024 Nov 1;95(11):113303. doi: 10.1063/5.0238136.

Authors

L X Li¹, J B Li¹, J D Ma¹, Y C Feng¹, Z H Zhang¹, W H Zhang¹, D Hitz¹, H Y Ma¹, X Y Wang^{1

2}, W Lu^{1

2}, L T Sun^{1

2}, H W Zhao^{1

2}

Affiliations

¹ Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
² School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China.

PMID: 39560462
DOI: 10.1063/5.0238136

Abstract

To satisfy the requirement of heavy ion synchrotron for intense highly charged ion beams, a comprehensive study of the afterglow mode was performed with two advanced electron cyclotron resonance (ECR) ion sources, i.e., a second-generation ECR ion source (LECR4) and a third-generation ECR ion source (SECRAL-II). Intense pulsed uranium ion beams of highly charged states were produced with both ion sources (e.g., 58 eμA of 238U39+ in LECR4 and 124 eμA of 238U46+ in SECRAL-II). Compared to the beam intensity records obtained in continuous wave mode, the gain factor is up to ∼6. It was found that the optimum microwave pulse width and the decay time in SECRAL-II operating at 24 GHz are obviously longer than those in LECR4 operating at 14.5 GHz, aligning with a previous observation made with SECRAL-II ion source.