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

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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

All Science Journal Classification (ASJC) codes

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

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