Development of a high energy hydrogen beam injection system for divertor plasma simulation experiments on the DT-ALPHA device

Peerapat Boonyarittipong, Hiroyuki Takahashi, Sumio Kitajima, Atsushi Okamoto, Kenji Tobita, Takahiko Kobayashi, Takeshi Saikyo, Yusuke Ishikawa, Kenta Ogasawara, Hidetoshi Hashizume

Research output: Contribution to journalArticlepeer-review

Abstract

Using the SIMION program, we have calculated the trajectories of hydrogen ions to investigate the effects of an E × B filter to be used for hydrogen ion beam injection experiments. The geometry we have utilized for the simulation matches the ion beam transport system of the DT-ALPHA device. Before investigating the hydrogen ion trajectories, we calculated helium ion trajectories and compared the results with experiments using a helium ion beam to confirm the results of the SIMION calculations. We then calculated the trajectories of the hydrogen ions H+, H2+, and H3+ . We found that the electric field required to select an H+ ion beam differs from that obtained from a theoretical calculation, and we interpret this as a result of the fringe fields of the E × B filter. We have also evaluated the H+ ion beam size at the ion entrance aperture using SIMION. This calculation indicates that spreading of the hydrogen ions along the electric and magnetic fields differs because of non-homogeneous fields and the fringe fields of the filter. In addition, we have investigated the trajectories and beam sizes of He+ ion beams, we found that the E × B filter has no significant influence on the He+ ion beam experiments.

Original languageEnglish
Article number3402102
JournalPlasma and Fusion Research
Volume13
DOIs
Publication statusPublished - 2018

Keywords

  • Divertor
  • Hydrogen
  • Ion beam transport
  • Ion-trajectory simulation
  • Volumetric recombination

ASJC Scopus subject areas

  • Condensed Matter Physics

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