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; K. Hanada; N. Yoshida; K. Nakamura; A. Fujisawa; K. Matsuoka; H. Idei; Y. Nagashima; M. Hasegawa; T. Onchi; S. Banerjee; K. Mishra

doi:10.1016/j.jnucmat.2014.12.092

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, K. Hanada, N. Yoshida, K. Nakamura, A. Fujisawa, K. Matsuoka, H. Idei, Y. Nagashima, M. Hasegawa, T. Onchi, S. BanerjeeK. Mishra

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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 language	English
Article number	48824
Pages (from-to)	1087-1090
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.12.092
Publication status	Published - Jul 22 2015

All Science Journal Classification (ASJC) codes

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

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10.1016/j.jnucmat.2014.12.092

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Kuzmin, A., Zushi, H., Takagi, I., Sharma, S. K., 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., ... 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, 463, 1087-1090. Article 48824. https://doi.org/10.1016/j.jnucmat.2014.12.092

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

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

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.",

author = "A. Kuzmin and H. Zushi and I. Takagi and Sharma, {S. K.} and A. Rusinov and Y. Inoue and Y. Hirooka and H. Zhou and M. Kobayashi and M. Sakamoto and K. Hanada and N. Yoshida and K. Nakamura and A. Fujisawa and K. Matsuoka and H. Idei and Y. Nagashima and M. Hasegawa and T. Onchi and S. Banerjee and K. Mishra",

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year = "2015",

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doi = "10.1016/j.jnucmat.2014.12.092",

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T1 - Global gas balance and influence of atomic hydrogen irradiation on the wall inventory in steady-state operation of QUEST tokamak

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, K.

AU - Yoshida, N.

AU - Nakamura, K.

AU - Fujisawa, A.

AU - Matsuoka, K.

AU - Idei, H.

AU - Nagashima, Y.

AU - Hasegawa, M.

AU - Onchi, T.

AU - Banerjee, S.

AU - Mishra, K.

PY - 2015/7/22

Y1 - 2015/7/22

N2 - 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.

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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AN - SCOPUS:84937523760

SN - 0022-3115

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SP - 1087

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JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

M1 - 48824

ER -

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

Abstract

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