Note: An innovative method for 12C4+ suppression in 18O6+ beam production in an electron cyclotron resonance ion source

Hideshi Muto; Yukimitsu Ohshiro; Yasuteru Kotaka; Hidetoshi Yamaguchi; Yasuhiro Sakemi; Kiyoshi Kobayashi; Makoto Nishimura; Michihiro Oyaizu; Shigeru Kubono; Masayuki Kase; Toshiyuki Hattori; Susumu Shimoura

doi:10.1063/1.5000426

Note: An innovative method for ¹²C⁴⁺ suppression in ¹⁸O⁶⁺ beam production in an electron cyclotron resonance ion source

Rev Sci Instrum. 2018 Jan;89(1):016103. doi: 10.1063/1.5000426.

Affiliations

¹ Center of General Education, Tokyo University of Science, Suwa, 5000-1 Toyohira, Chino, Nagano 391-0292, Japan.
² Center for Nuclear Study, University of Tokyo, 2-1 Hirosawa, Riken Campus, Wako, Saitama 351-0198, Japan.
³ Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
⁴ Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
⁵ Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8551, Japan.

PMID: 29390664
DOI: 10.1063/1.5000426

Abstract

It is a major and complex task to accelerate an ion which has the same charge to mass ratio with strong contaminant ions, such as ¹²C⁴⁺ in the ¹⁸O⁶⁺ beam. An innovative method has been developed to suppress the contaminant ions in the Electron Cyclotron Resonance (ECR) ion source by introducing Li vapor. The ion distribution inside the ECR zone was obtained by the optical analysis of ions inside the ECR ion source. The ¹²C⁴⁺ ions were suppressed as much as by a factor of 10, whereas the ¹⁸O⁶⁺ beam changed little with the use of this technique.