Plasma and Fusion Research

Volume 13, 3402102 (2018)

Regular Articles


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 OKAMOTO1), Kenji TOBITA, Takahiko KOBAYASHI, Takeshi SAIKYO, Yusuke ISHIKAWA, Kenta OGASAWARA and Hidetoshi HASHIZUME
Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579, Japan
1)
Department of Applied Energy, Nagoya University, Nagoya 464-8603, Japan
(Received 28 December 2017 / Accepted 25 June 2018 / Published 10 September 2018)

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.


Keywords

hydrogen, ion beam transport, ion-trajectory simulation, divertor, volumetric recombination

DOI: 10.1585/pfr.13.3402102


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