Ultra-long pulse operation using lower hybrid waves on the superconducting high field tokamak triam-im

S. Moriyama, Y. Nakamura, A. Nagao, E. Jotaki, K. Nakamura, N. Hiraki, S. Itoh

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Abstract

Ultra-long pulse operation (> 3 min) was achieved on the superconducting high field tokamak TRIAM-1M. In this operation, the plasma current was maintained with a relatively peaked current distribution by the 2.45 GHz radiofrequency power (PRF < 35 kW) alone. A stationary plasma with a driven current of up to 35 kA and a line averaged electron density of up to 3 x 1012 cm"3 was produced by precise plasma position and gas feed control. The extremely long discharge showed the interesting characteristics that the high temperatures of about 1 keV for the electrons and about 0.5 keV for the ions were kept almost constant during steady state current drive and that there was no impurity accumulation which could have a fatally adverse effect on steady state tokamak operation.

Original languageEnglish
Pages (from-to)47-56
Number of pages10
JournalNuclear Fusion
Volume30
Issue number1
DOIs
Publication statusPublished - Jan 1990

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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