Study on wall recycling behaviour in CPD spherical tokamak

R. Bhattacharyay, H. Zushi, Y. Hirooka, M. Sakamoto, T. Yoshinaga, K. Okamoto, S. Kawasaki, Kazuaki Hanada, K. N. Sato, Kazuo Nakamura, Hiroshi Idei, T. Ryoukai, H. Nakashima, A. Higashijima

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Experiments to study wall recycling behaviour have been performed in the small spherical tokamak compact plasma-wall interaction experimental device (CPD) from the viewpoint of global as well as local plasma wall interaction condition. Electron cyclotron resonance (ECR) plasma of typically ∼50 to 400 ms duration is produced using ∼40 to 80 kW RF power. In order to study the global wall recycling behaviour, pressure measurements are carried out just before and after the ECR plasma in the absence of any external pumping. The recycling behaviour is found to change from release to pumping beyond a certain level of pressure value which is again found to be a function of shot history. The real-time local wall behaviour is studied in similar RF plasma using a rotating tungsten limiter, actively coated with lithium. Measurement of Hα light intensity in front of the rotating surface has indicated a clear reduction (∼10%) in the steady-state hydrogen recycling with continuous Li gettering of several minutes.

Original languageEnglish
Pages (from-to)1114-1119
Number of pages6
JournalFusion Engineering and Design
Volume83
Issue number7-9
DOIs
Publication statusPublished - Dec 1 2008

Fingerprint

Recycling
Plasmas
Electron cyclotron resonance
Beam plasma interactions
Tungsten
Limiters
Pressure measurement
Lithium
Hydrogen
Experiments

All Science Journal Classification (ASJC) codes

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

Cite this

Bhattacharyay, R., Zushi, H., Hirooka, Y., Sakamoto, M., Yoshinaga, T., Okamoto, K., ... Higashijima, A. (2008). Study on wall recycling behaviour in CPD spherical tokamak. Fusion Engineering and Design, 83(7-9), 1114-1119. https://doi.org/10.1016/j.fusengdes.2008.05.009

Study on wall recycling behaviour in CPD spherical tokamak. / Bhattacharyay, R.; Zushi, H.; Hirooka, Y.; Sakamoto, M.; Yoshinaga, T.; Okamoto, K.; Kawasaki, S.; Hanada, Kazuaki; Sato, K. N.; Nakamura, Kazuo; Idei, Hiroshi; Ryoukai, T.; Nakashima, H.; Higashijima, A.

In: Fusion Engineering and Design, Vol. 83, No. 7-9, 01.12.2008, p. 1114-1119.

Research output: Contribution to journalArticle

Bhattacharyay, R, Zushi, H, Hirooka, Y, Sakamoto, M, Yoshinaga, T, Okamoto, K, Kawasaki, S, Hanada, K, Sato, KN, Nakamura, K, Idei, H, Ryoukai, T, Nakashima, H & Higashijima, A 2008, 'Study on wall recycling behaviour in CPD spherical tokamak', Fusion Engineering and Design, vol. 83, no. 7-9, pp. 1114-1119. https://doi.org/10.1016/j.fusengdes.2008.05.009
Bhattacharyay R, Zushi H, Hirooka Y, Sakamoto M, Yoshinaga T, Okamoto K et al. Study on wall recycling behaviour in CPD spherical tokamak. Fusion Engineering and Design. 2008 Dec 1;83(7-9):1114-1119. https://doi.org/10.1016/j.fusengdes.2008.05.009
Bhattacharyay, R. ; Zushi, H. ; Hirooka, Y. ; Sakamoto, M. ; Yoshinaga, T. ; Okamoto, K. ; Kawasaki, S. ; Hanada, Kazuaki ; Sato, K. N. ; Nakamura, Kazuo ; Idei, Hiroshi ; Ryoukai, T. ; Nakashima, H. ; Higashijima, A. / Study on wall recycling behaviour in CPD spherical tokamak. In: Fusion Engineering and Design. 2008 ; Vol. 83, No. 7-9. pp. 1114-1119.
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