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Effects of modified surfaces produced at plasma-facing surface on hydrogen release behavior in the LHD

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Title: Effects of modified surfaces produced at plasma-facing surface on hydrogen release behavior in the LHD
Authors: Nobuta, Y. Browse this author
Masuzaki, S. Browse this author
Tokitani, M. Browse this author
Ashikawa, N. Browse this author
Nagata, D. Browse this author
Yoshida, N. Browse this author
Oya, Y. Browse this author
Yajima, M. Browse this author
Motojima, G. Browse this author
Kasahara, H. Browse this author
Miyamoto, M. Browse this author
Ohno, N. Browse this author
Yamauchi, Y. Browse this author →KAKEN DB
Keywords: Hydrogen retention
Desorption
Redeposition
Long-term sample
LHD
Issue Date: Aug-2017
Publisher: Elsevier
Journal Title: Nuclear materials and energy
Volume: 12
Start Page: 483
End Page: 487
Publisher DOI: 10.1016/j.nme.2017.02.025
Abstract: In the present study, an additional deuterium (D) ion irradiation was performed against long-term samples mounted on the helical coil can and in the outer private region in the LHD during the 17th experimental campaign. Based on the release behavior of the D and hydrogen (H) retained during the experimental campaign, the difference of release behavior at the top surface and in bulk of modified surfaces is discussed. Almost all samples on the helical coil can were erosion-dominant and some samples were covered with boron or carbon, while a very thick carbon films were formed in the outer private region. In the erosion-dominant area, the D desorbed at much lower temperatures compared to that of H retained during the LHD plasma operation. For the samples covered with boron, the D tended to desorb at lower temperatures compared to H. For the carbon deposition samples, the D desorbed at much higher temperatures compared to no deposition and boron-covered samples, which was very similar to that of H. The D retention capabilities at the top surface of carbon and boron films were 2-3 times higher than no deposition area. The results indicate that the retention and release behavior at the top surface of the modified layer can be different from that of bulk substrate material.
Rights: (C) 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.
https://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article
URI: http://hdl.handle.net/2115/68151
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: 信太 祐二

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