Sawtooth stabilization by electron cyclotron heating at the q=1 surface in the WT-3 tokamak

S. Tanaka, Kazuaki Hanada, H. Tanaka, M. Iida, S. Ide, T. Minami, M. Nakamura, T. Maekawa, Y. Terumichi, M. Yamada, J. Manickam, R. B. White

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Sawtooth oscillations (STO) in the Ohmically heated (OH) WT-3 tokamak [Plasma Physics and Controlled Nuclear Fusion Research 1988 (IAEA, Vienna, 1989), Vol. 1, p. 563] are strongly modified or suppressed by localized electron cyclotron resonance heating (ECH) near the q = 1 surface, where q refers to the safety factor. The effect of ECH is much stronger when it is applied on the high-field side, as compared to the low-field side. Complete suppression of the STO is achieved for the duration of the ECH when it is applied on the high-field side, in a low-density plasma, provided the ECH power exceeds a threshold value. This threshold decreases with the increasing safety factor at the limiter q L and the complete stabilization of STO can be obtained even when ECH is applied on the low-field side in the high-q L region. It is noticeable that these complete stabilizations can be obtained only by the localized ECH with the elliptic antenna. The STO stabilization is attributed to a modification of the current density profile by high-energy electrons generated by ECH, which reduces the shear in the q = 1 region.

Original languageEnglish
Pages (from-to)2200-2204
Number of pages5
JournalPhysics of Fluids B
Volume3
Issue number8
DOIs
Publication statusPublished - Jan 1 1991
Externally publishedYes

Fingerprint

electron cyclotron heating
Electron cyclotron resonance
Cyclotrons
electron cyclotron resonance
Stabilization
stabilization
Heating
heating
Electrons
oscillations
safety factors
Safety factor
thresholds
Plasma density
Limiters
plasma physics
nuclear fusion
high energy electrons
plasma density
Current density

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this

Sawtooth stabilization by electron cyclotron heating at the q=1 surface in the WT-3 tokamak. / Tanaka, S.; Hanada, Kazuaki; Tanaka, H.; Iida, M.; Ide, S.; Minami, T.; Nakamura, M.; Maekawa, T.; Terumichi, Y.; Yamada, M.; Manickam, J.; White, R. B.

In: Physics of Fluids B, Vol. 3, No. 8, 01.01.1991, p. 2200-2204.

Research output: Contribution to journalArticle

Tanaka, S, Hanada, K, Tanaka, H, Iida, M, Ide, S, Minami, T, Nakamura, M, Maekawa, T, Terumichi, Y, Yamada, M, Manickam, J & White, RB 1991, 'Sawtooth stabilization by electron cyclotron heating at the q=1 surface in the WT-3 tokamak', Physics of Fluids B, vol. 3, no. 8, pp. 2200-2204. https://doi.org/10.1063/1.859636
Tanaka, S. ; Hanada, Kazuaki ; Tanaka, H. ; Iida, M. ; Ide, S. ; Minami, T. ; Nakamura, M. ; Maekawa, T. ; Terumichi, Y. ; Yamada, M. ; Manickam, J. ; White, R. B. / Sawtooth stabilization by electron cyclotron heating at the q=1 surface in the WT-3 tokamak. In: Physics of Fluids B. 1991 ; Vol. 3, No. 8. pp. 2200-2204.
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