Hydrogen permeation measurements in the spherical tokamak quest and its numerical modeling

S. K. Sharma, H. Zushi, I. Takagi, Y. Hisano, T. Shikama, S. Morita, T. Tanabe, N. Yoshida, M. Sakamoto, Y. Higashizono, Kazuaki Hanada, Makoto Hasegawa, O. Mitarai, Kazuo Nakamura, Hiroshi Idei, K. N. Sato, S. Kawasaki, H. Nakashima, A. Higashijima, Y. Nakashima & 8 others N. Nishino, Y. Hatano, A. Sagara, Y. Nakamura, N. Ashikawa, T. Maekawa, Y. Kishimoto, Y. Takase

Research output: Contribution to journalArticle

Abstract

A permeation measuring system with a nickel membrane of 30 pm thickness was installed near the mid plane of the spherical tokamak, QUEST. Hydrogen permeation through the membrane heated at fix temperatures (422 -506 K) was measured during short pulse (< 1 s) and long pulse (1 hour) plasma discharges. After the membrane was heated to a required temperature, hydrogen plasma was discharged using a 2.45 GHz or 8.2 GHzRF system. Significant plasma-driven permeation was observed even for very short plasma discharges (e.g. 0.1s). Numerical calculations with the use of diffusion equation under recombination boundary conditions were conducted to simulate the transient permeation behavior. The numerical calculations were also used to estimate diffusion coefficient and recombination coefficients of membrane material. Temperature dependence of both the coefficients was explained by the Arrhenius law. A one hour long permeation curve was also numerically reproduced using the same set of parameters except an increasing recombination coefficient on the plasma side of the membrane.

Original languageEnglish
Pages (from-to)1511-1514
Number of pages4
JournalFusion Science and Technology
Volume60
Issue number4
DOIs
Publication statusPublished - Jan 1 2011

Fingerprint

Permeation
Hydrogen
membranes
Membranes
Plasmas
hydrogen
recombination coefficient
plasma jets
hydrogen plasma
coefficients
pulses
Nickel
fixing
Temperature
diffusion coefficient
Boundary conditions
nickel
boundary conditions
temperature dependence
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Sharma, S. K., Zushi, H., Takagi, I., Hisano, Y., Shikama, T., Morita, S., ... Takase, Y. (2011). Hydrogen permeation measurements in the spherical tokamak quest and its numerical modeling. Fusion Science and Technology, 60(4), 1511-1514. https://doi.org/10.13182/FST11-A12719

Hydrogen permeation measurements in the spherical tokamak quest and its numerical modeling. / Sharma, S. K.; Zushi, H.; Takagi, I.; Hisano, Y.; Shikama, T.; Morita, S.; Tanabe, T.; Yoshida, N.; Sakamoto, M.; Higashizono, Y.; Hanada, Kazuaki; Hasegawa, Makoto; Mitarai, O.; Nakamura, Kazuo; Idei, Hiroshi; Sato, K. N.; Kawasaki, S.; Nakashima, H.; Higashijima, A.; Nakashima, Y.; Nishino, N.; Hatano, Y.; Sagara, A.; Nakamura, Y.; Ashikawa, N.; Maekawa, T.; Kishimoto, Y.; Takase, Y.

In: Fusion Science and Technology, Vol. 60, No. 4, 01.01.2011, p. 1511-1514.

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, Mitarai, O, Nakamura, K, Idei, H, Sato, KN, Kawasaki, S, Nakashima, H, Higashijima, A, Nakashima, Y, Nishino, N, Hatano, Y, Sagara, A, Nakamura, Y, Ashikawa, N, Maekawa, T, Kishimoto, Y & Takase, Y 2011, 'Hydrogen permeation measurements in the spherical tokamak quest and its numerical modeling', Fusion Science and Technology, vol. 60, no. 4, pp. 1511-1514. https://doi.org/10.13182/FST11-A12719
Sharma, S. K. ; Zushi, H. ; Takagi, I. ; Hisano, Y. ; Shikama, T. ; Morita, S. ; Tanabe, T. ; Yoshida, N. ; Sakamoto, M. ; Higashizono, Y. ; Hanada, Kazuaki ; Hasegawa, Makoto ; Mitarai, O. ; Nakamura, Kazuo ; Idei, Hiroshi ; Sato, K. N. ; Kawasaki, S. ; Nakashima, H. ; Higashijima, A. ; Nakashima, Y. ; Nishino, N. ; Hatano, Y. ; Sagara, A. ; Nakamura, Y. ; Ashikawa, N. ; Maekawa, T. ; Kishimoto, Y. ; Takase, Y. / Hydrogen permeation measurements in the spherical tokamak quest and its numerical modeling. In: Fusion Science and Technology. 2011 ; Vol. 60, No. 4. pp. 1511-1514.
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