Hydrogen flux measurements with permeation probes in spherical tokamak QUEST

A. Kuzmin; H. Zushi; I. Takagi; S. K. Sharma; Y. Hirooka; M. Kobayashi; M. Sakamoto; K. Hanada; T. Onchi; Y. Oyama; N. Youshida; K. Nakamura; A. Fujisawa; H. Idei; Y. Nagashima; M. Hasegawa; K. Mishra

doi:10.1016/j.vacuum.2016.04.025

Hydrogen flux measurements with permeation probes in spherical tokamak QUEST

A. Kuzmin, H. Zushi, I. Takagi, S. K. Sharma, Y. Hirooka, M. Kobayashi, M. Sakamoto, K. Hanada, T. Onchi, Y. Oyama, N. Youshida, K. Nakamura, A. Fujisawa, H. Idei, Y. Nagashima, M. Hasegawa, K. Mishra

Research output: Contribution to journal › Article

3 Citations (Scopus)

Abstract

Poloidal and radial distributions of the hydrogen flux, both atomic and ion, to the plasma facing materials (PFMs) are measured with four fixed and one movable PdCu membrane probes in the QUEST spherical tokamak. Direct information about hydrogen retention in the areas far from main plasma-wall interaction is essential because the significant part of the global retention is due to atomic hydrogen. Incident hydrogen flux Γ_inc is numerically reconstructed by fitting the experimentally measured hydrogen flux Γ_p, permeated through the membrane. The sensitivity of the probe is improved when compared with other work which allows dynamic changes of the retention flux to be monitored, allowing detection of 10% of the Γ_inc modulation, or ∼10¹⁷ H m⁻²s⁻¹.

Original language	English
Pages (from-to)	178-182
Number of pages	5
Journal	Vacuum
Volume	129
DOIs	https://doi.org/10.1016/j.vacuum.2016.04.025
Publication status	Published - Jul 1 2016

All Science Journal Classification (ASJC) codes

Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films

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Kuzmin, A., Zushi, H., Takagi, I., Sharma, S. K., Hirooka, Y., Kobayashi, M., Sakamoto, M., Hanada, K., Onchi, T., Oyama, Y., Youshida, N., Nakamura, K., Fujisawa, A., Idei, H., Nagashima, Y., Hasegawa, M., & Mishra, K. (2016). Hydrogen flux measurements with permeation probes in spherical tokamak QUEST. Vacuum, 129, 178-182. https://doi.org/10.1016/j.vacuum.2016.04.025

Hydrogen flux measurements with permeation probes in spherical tokamak QUEST. / Kuzmin, A.; Zushi, H.; Takagi, I.; Sharma, S. K.; Hirooka, Y.; Kobayashi, M.; Sakamoto, M.; Hanada, K.; Onchi, T.; Oyama, Y.; Youshida, N.; Nakamura, K.; Fujisawa, A.; Idei, H.; Nagashima, Y.; Hasegawa, M.; Mishra, K.

In: Vacuum, Vol. 129, 01.07.2016, p. 178-182.

Research output: Contribution to journal › Article

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title = "Hydrogen flux measurements with permeation probes in spherical tokamak QUEST",

abstract = "Poloidal and radial distributions of the hydrogen flux, both atomic and ion, to the plasma facing materials (PFMs) are measured with four fixed and one movable PdCu membrane probes in the QUEST spherical tokamak. Direct information about hydrogen retention in the areas far from main plasma-wall interaction is essential because the significant part of the global retention is due to atomic hydrogen. Incident hydrogen flux Γinc is numerically reconstructed by fitting the experimentally measured hydrogen flux Γp, permeated through the membrane. The sensitivity of the probe is improved when compared with other work which allows dynamic changes of the retention flux to be monitored, allowing detection of 10% of the Γinc modulation, or ∼1017 H m−2s−1.",

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

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AU - Kuzmin, A.

AU - Zushi, H.

AU - Takagi, I.

AU - Sharma, S. K.

AU - Hirooka, Y.

AU - Kobayashi, M.

AU - Sakamoto, M.

AU - Hanada, K.

AU - Onchi, T.

AU - Oyama, Y.

AU - Youshida, N.

AU - Nakamura, K.

AU - Fujisawa, A.

AU - Idei, H.

AU - Nagashima, Y.

AU - Hasegawa, M.

AU - Mishra, K.

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AB - Poloidal and radial distributions of the hydrogen flux, both atomic and ion, to the plasma facing materials (PFMs) are measured with four fixed and one movable PdCu membrane probes in the QUEST spherical tokamak. Direct information about hydrogen retention in the areas far from main plasma-wall interaction is essential because the significant part of the global retention is due to atomic hydrogen. Incident hydrogen flux Γinc is numerically reconstructed by fitting the experimentally measured hydrogen flux Γp, permeated through the membrane. The sensitivity of the probe is improved when compared with other work which allows dynamic changes of the retention flux to be monitored, allowing detection of 10% of the Γinc modulation, or ∼1017 H m−2s−1.

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