Global gas balance and influence of atomic hydrogen irradiation on the wall inventory in steady-state operation of QUEST tokamak

A. Kuzmin, H. Zushi, I. Takagi, S. K. Sharma, A. Rusinov, Y. Inoue, Y. Hirooka, H. Zhou, M. Kobayashi, M. Sakamoto, Kazuaki Hanada, N. Yoshida, K. Nakamura, akihide fujisawa, K. Matsuoka, Hiroshi Idei, Yoshihiko Nagashima, Makoto Hasegawa, Takumi Onchi, S. Banerjee & 1 others K. Mishra

Research output: Contribution to journalArticle

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Abstract

Abstract Hydrogen wall pumping is studied in steady state tokamak operation (SSTO) of QUEST with all metal plasma facing materials PFMs at 100 °C. The duration of SSTO is up to 820 s in fully non-inductive plasma. Global gas balance analysis shows that wall pumping at the apparent (retention-release) rate of 1-6 × 1018 H/s is dominant and 70-80% of injected H2 can be retained in PFMs. However, immediately after plasma termination the H2 release rate enhances to ∼1019 H/s. In order to understand a true retention process the direct measurement of retention flux has been carried out by permeation probes. The comparison between the evaluated wall retention and results from global analysis is discussed.

Original languageEnglish
Article number48824
Pages (from-to)1087-1090
Number of pages4
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - Jul 22 2015

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Hydrogen
Gases
pulse frequency modulation
Irradiation
Plasmas
irradiation
hydrogen
gases
pumping
Permeation
Metals
Fluxes
probes
metals

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

Cite this

Global gas balance and influence of atomic hydrogen irradiation on the wall inventory in steady-state operation of QUEST tokamak. / Kuzmin, A.; Zushi, H.; Takagi, I.; Sharma, S. K.; Rusinov, A.; Inoue, Y.; Hirooka, Y.; Zhou, H.; Kobayashi, M.; Sakamoto, M.; Hanada, Kazuaki; Yoshida, N.; Nakamura, K.; fujisawa, akihide; Matsuoka, K.; Idei, Hiroshi; Nagashima, Yoshihiko; Hasegawa, Makoto; Onchi, Takumi; Banerjee, S.; Mishra, K.

In: Journal of Nuclear Materials, Vol. 463, 48824, 22.07.2015, p. 1087-1090.

Research output: Contribution to journalArticle

Kuzmin, A, Zushi, H, Takagi, I, Sharma, SK, Rusinov, A, Inoue, Y, Hirooka, Y, Zhou, H, Kobayashi, M, Sakamoto, M, Hanada, K, Yoshida, N, Nakamura, K, fujisawa, A, Matsuoka, K, Idei, H, Nagashima, Y, Hasegawa, M, Onchi, T, Banerjee, S & Mishra, K 2015, 'Global gas balance and influence of atomic hydrogen irradiation on the wall inventory in steady-state operation of QUEST tokamak', Journal of Nuclear Materials, vol. 463, 48824, pp. 1087-1090. https://doi.org/10.1016/j.jnucmat.2014.12.092
Kuzmin, A. ; Zushi, H. ; Takagi, I. ; Sharma, S. K. ; Rusinov, A. ; Inoue, Y. ; Hirooka, Y. ; Zhou, H. ; Kobayashi, M. ; Sakamoto, M. ; Hanada, Kazuaki ; Yoshida, N. ; Nakamura, K. ; fujisawa, akihide ; Matsuoka, K. ; Idei, Hiroshi ; Nagashima, Yoshihiko ; Hasegawa, Makoto ; Onchi, Takumi ; Banerjee, S. ; Mishra, K. / Global gas balance and influence of atomic hydrogen irradiation on the wall inventory in steady-state operation of QUEST tokamak. In: Journal of Nuclear Materials. 2015 ; Vol. 463. pp. 1087-1090.
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AU - Kuzmin, A.

AU - Zushi, H.

AU - Takagi, I.

AU - Sharma, S. K.

AU - Rusinov, A.

AU - Inoue, Y.

AU - Hirooka, Y.

AU - Zhou, H.

AU - Kobayashi, M.

AU - Sakamoto, M.

AU - Hanada, Kazuaki

AU - Yoshida, N.

AU - Nakamura, K.

AU - fujisawa, akihide

AU - Matsuoka, K.

AU - Idei, Hiroshi

AU - Nagashima, Yoshihiko

AU - Hasegawa, Makoto

AU - Onchi, Takumi

AU - Banerjee, S.

AU - Mishra, K.

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AB - Abstract Hydrogen wall pumping is studied in steady state tokamak operation (SSTO) of QUEST with all metal plasma facing materials PFMs at 100 °C. The duration of SSTO is up to 820 s in fully non-inductive plasma. Global gas balance analysis shows that wall pumping at the apparent (retention-release) rate of 1-6 × 1018 H/s is dominant and 70-80% of injected H2 can be retained in PFMs. However, immediately after plasma termination the H2 release rate enhances to ∼1019 H/s. In order to understand a true retention process the direct measurement of retention flux has been carried out by permeation probes. The comparison between the evaluated wall retention and results from global analysis is discussed.

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