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Performances of inert gas glow discharges for reductions of fuel hydrogen retention and helium retention

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Title: Performances of inert gas glow discharges for reductions of fuel hydrogen retention and helium retention
Authors: Hino, T. Browse this author →KAKEN DB
Kimura, M. Browse this author
Yamauchi, Y. Browse this author →KAKEN DB
Nishimura, K. Browse this author
Ashikawa, N. Browse this author
Nobuta, Y. Browse this author
Keywords: Fuel hydrogen retention
Helium retention
Wall conditionings
Helium glow discharge
Neon glow discharge
Argon glow discharge
Issue Date: Dec-2010
Publisher: Elsevier B.V.
Journal Title: Fusion Engineering and Design
Volume: 85
Issue: 7-9
Start Page: 974
End Page: 978
Publisher DOI: 10.1016/j.fusengdes.2009.11.005
Abstract: In order to clarify the effects of inert gas discharges on the reduction of fuel hydrogen retention, the inert gas discharge has to be similarly conducted in the same apparatus with the same conditions. In the present experiment, first, the hydrogen glow discharge was conducted to measure the fuel hydrogen retention. During the discharge, the amount of retained hydrogen was measured by a technique of residual gas analysis. The inert gas discharges, He, Ne and Ar discharges, then, were carried out after the hydrogen discharge to measure the amount of removed hydrogen. The fractions of removed hydrogen after the He, Ne and Ar discharges were 0.8, 0.3 and 0.1, respectively. The projected range of helium ion is comparable with that of the hydrogen ion, so that the helium impact desorption well removed the hydrogen. The sputter-etching rate of argon is significantly high, so that the wall surface is quickly covered by the deposited layer. Thus, the removal ratio of the Ar discharge becomes lower than that of the He or Ne discharge. The H2, Ne or Ar discharge was carried out after the He discharge to reduce the helium retention. It was found that the Ne and Ar discharges significantly reduced the helium retention, although the H2 discharge little reduced the helium retention. The reduction of the Ne discharge was larger than that of the Ar discharge. The amounts of the retained He, Ne and Ar were a few times, two orders and three orders of magnitude smaller than that of hydrogen.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 日野 友明

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