High beta discharges with neutral beam injection in CHS

S. Okamura, K. Matsuoka, K. Nishimura, K. Tsumori, R. Akiyama, S. Sakakibara, H. Yamada, S. Morita, T. Morisaki, N. Nakajima, K. Tanaka, J. Xu, K. Ida, H. Iguchi, A. Lazaros, T. Ozaki, H. Arimoto, A. Ejiri, M. Fujiwara, Hiroshi IdeiO. Kaneko, K. Kawahata, T. Kawamoto, A. Komori, S. Kubo, O. Motojima, V. D. Pustovitov, C. Takahashi, K. Toi, I. Yamada

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

High beta plasmas with a volume averaged equilibrium beta value of 2.1% were produced in CHS using tangential neutral beam injection. This beta value was achieved with the confinement improvement (reheat mode) observed after turning off strong gas puffing. Wall conditioning with titanium gettering was used to make high density operation (ne ≤ 8 × 10 19 m-3) possible for low magnetic fields (Bt = 0.6 T). The discharges start with the magnetic hill configuration (in vacuum) and finally achieve Mercier stable equilibrium owing to the self-stabilization effect given by the magnetic well which is produced by the plasma pressure. The Shafranov shift was about 40% of a plasma minor radius. Magnetic fluctuations did not increase with increasing plasma pressure when the beta value exceeded 1%. Dynamic poloidal field control was applied to suppress the outward plasma shift with increasing plasma pressure. Such operation gave an additional increase of beta value compared with the constant poloidal field operation.

Original languageEnglish
Article numberI03
Pages (from-to)283-296
Number of pages14
JournalNuclear Fusion
Volume35
Issue number3
DOIs
Publication statusPublished - Dec 1 1995

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plasma pressure
beam injection
neutral beams
shift
conditioning
titanium
stabilization
vacuum
radii
configurations
gases
magnetic fields

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Okamura, S., Matsuoka, K., Nishimura, K., Tsumori, K., Akiyama, R., Sakakibara, S., ... Yamada, I. (1995). High beta discharges with neutral beam injection in CHS. Nuclear Fusion, 35(3), 283-296. [I03]. https://doi.org/10.1088/0029-5515/35/3/I03

High beta discharges with neutral beam injection in CHS. / Okamura, S.; Matsuoka, K.; Nishimura, K.; Tsumori, K.; Akiyama, R.; Sakakibara, S.; Yamada, H.; Morita, S.; Morisaki, T.; Nakajima, N.; Tanaka, K.; Xu, J.; Ida, K.; Iguchi, H.; Lazaros, A.; Ozaki, T.; Arimoto, H.; Ejiri, A.; Fujiwara, M.; Idei, Hiroshi; Kaneko, O.; Kawahata, K.; Kawamoto, T.; Komori, A.; Kubo, S.; Motojima, O.; Pustovitov, V. D.; Takahashi, C.; Toi, K.; Yamada, I.

In: Nuclear Fusion, Vol. 35, No. 3, I03, 01.12.1995, p. 283-296.

Research output: Contribution to journalArticle

Okamura, S, Matsuoka, K, Nishimura, K, Tsumori, K, Akiyama, R, Sakakibara, S, Yamada, H, Morita, S, Morisaki, T, Nakajima, N, Tanaka, K, Xu, J, Ida, K, Iguchi, H, Lazaros, A, Ozaki, T, Arimoto, H, Ejiri, A, Fujiwara, M, Idei, H, Kaneko, O, Kawahata, K, Kawamoto, T, Komori, A, Kubo, S, Motojima, O, Pustovitov, VD, Takahashi, C, Toi, K & Yamada, I 1995, 'High beta discharges with neutral beam injection in CHS', Nuclear Fusion, vol. 35, no. 3, I03, pp. 283-296. https://doi.org/10.1088/0029-5515/35/3/I03
Okamura S, Matsuoka K, Nishimura K, Tsumori K, Akiyama R, Sakakibara S et al. High beta discharges with neutral beam injection in CHS. Nuclear Fusion. 1995 Dec 1;35(3):283-296. I03. https://doi.org/10.1088/0029-5515/35/3/I03
Okamura, S. ; Matsuoka, K. ; Nishimura, K. ; Tsumori, K. ; Akiyama, R. ; Sakakibara, S. ; Yamada, H. ; Morita, S. ; Morisaki, T. ; Nakajima, N. ; Tanaka, K. ; Xu, J. ; Ida, K. ; Iguchi, H. ; Lazaros, A. ; Ozaki, T. ; Arimoto, H. ; Ejiri, A. ; Fujiwara, M. ; Idei, Hiroshi ; Kaneko, O. ; Kawahata, K. ; Kawamoto, T. ; Komori, A. ; Kubo, S. ; Motojima, O. ; Pustovitov, V. D. ; Takahashi, C. ; Toi, K. ; Yamada, I. / High beta discharges with neutral beam injection in CHS. In: Nuclear Fusion. 1995 ; Vol. 35, No. 3. pp. 283-296.
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