Permeation measurements for investigating atomic hydrogen flux and wall pumping/fuelling dynamics in QUEST

S. K. Sharma, H. Zushi, I. Takagi, Y. Hisano, T. Shikama, S. Morita, T. Tanabe, N. Yoshida, M. Sakamoto, Y. Higashizono, K. Hanada, M. Hasegawa, K. Nakamura, H. Idei, K. N. Sato, S. Kawasaki, H. Nakashima, A. Higashijima, Y. Nakashima, Y. HatanoA. Sagara, Y. Nakamura, N. Ashikawa, T. Maekawa, Y. Kishimoto, Y. Takase

Research output: Contribution to journalArticle

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Abstract

In order to investigate the overall atomic hydrogen background and the dynamic characteristics of wall pumping/fuelling phenomenon, a permeation probe system has been developed and applied in the spherical tokamak QUEST. Reliability of measurements, within ±3% accuracy and a positive correlation with the hydrogen line emission over three orders of magnitude have been demonstrated for more than 3000 various plasma discharges. By comparison of the experimental permeation (flux) curves with the numerically simulated curves, the net incident atomic hydrogen flux is evaluated in the range of 1 × 10 19 H m -2 s -1 to 4 × 10 20 H m -2 s -1. The atomic flux has been investigated as a function of various plasma operation parameters like RF power, gas pressure and magnetic configuration. Using the static particle balance and permeation measurements, the progress in wall conditioning has been investigated. An inverse correlation between the atomic hydrogen flux and improvement in wall pumping has been observed over the two campaigns.

Original languageEnglish
Pages (from-to)83-93
Number of pages11
JournalJournal of Nuclear Materials
Volume420
Issue number1-3
DOIs
Publication statusPublished - Jan 1 2012

Fingerprint

Fueling
refueling
Permeation
Hydrogen
pumping
Fluxes
hydrogen
Plasmas
curves
conditioning
dynamic characteristics
plasma jets
gas pressure
Gases
probes
configurations

All Science Journal Classification (ASJC) codes

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

Cite this

Permeation measurements for investigating atomic hydrogen flux and wall pumping/fuelling dynamics in QUEST. / Sharma, S. K.; Zushi, H.; Takagi, I.; Hisano, Y.; Shikama, T.; Morita, S.; Tanabe, T.; Yoshida, N.; Sakamoto, M.; Higashizono, Y.; Hanada, K.; Hasegawa, M.; Nakamura, K.; Idei, H.; Sato, K. N.; Kawasaki, S.; Nakashima, H.; Higashijima, A.; Nakashima, Y.; Hatano, Y.; Sagara, A.; Nakamura, Y.; Ashikawa, N.; Maekawa, T.; Kishimoto, Y.; Takase, Y.

In: Journal of Nuclear Materials, Vol. 420, No. 1-3, 01.01.2012, p. 83-93.

Research output: Contribution to journalArticle

Sharma, SK, Zushi, H, Takagi, I, Hisano, Y, Shikama, T, Morita, S, Tanabe, T, Yoshida, N, Sakamoto, M, Higashizono, Y, Hanada, K, Hasegawa, M, Nakamura, K, Idei, H, Sato, KN, Kawasaki, S, Nakashima, H, Higashijima, A, Nakashima, Y, Hatano, Y, Sagara, A, Nakamura, Y, Ashikawa, N, Maekawa, T, Kishimoto, Y & Takase, Y 2012, 'Permeation measurements for investigating atomic hydrogen flux and wall pumping/fuelling dynamics in QUEST', Journal of Nuclear Materials, vol. 420, no. 1-3, pp. 83-93. https://doi.org/10.1016/j.jnucmat.2011.09.026
Sharma, S. K. ; Zushi, H. ; Takagi, I. ; Hisano, Y. ; Shikama, T. ; Morita, S. ; Tanabe, T. ; Yoshida, N. ; Sakamoto, M. ; Higashizono, Y. ; Hanada, K. ; Hasegawa, M. ; Nakamura, K. ; Idei, H. ; Sato, K. N. ; Kawasaki, S. ; Nakashima, H. ; Higashijima, A. ; Nakashima, Y. ; Hatano, Y. ; Sagara, A. ; Nakamura, Y. ; Ashikawa, N. ; Maekawa, T. ; Kishimoto, Y. ; Takase, Y. / Permeation measurements for investigating atomic hydrogen flux and wall pumping/fuelling dynamics in QUEST. In: Journal of Nuclear Materials. 2012 ; Vol. 420, No. 1-3. pp. 83-93.
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AU - Shikama, T.

AU - Morita, S.

AU - Tanabe, T.

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AU - Nakashima, H.

AU - Higashijima, A.

AU - Nakashima, Y.

AU - Hatano, Y.

AU - Sagara, A.

AU - Nakamura, Y.

AU - Ashikawa, N.

AU - Maekawa, T.

AU - Kishimoto, Y.

AU - Takase, Y.

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