Temporal behaviour of the potential and fluctuations at the L-H transition on JFT-2M

T. Ido, K. Kamiya, Y. Miura, Y. Hamada, A. Nishizawa, Y. Kawasumi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Potential and density/temperature fluctuations at the L-H transition are measured by a heavy ion beam probe (HIBP) on JFT-2M. It has been observed that the time scale of potential change is as fast as 10-100 μ,s when the input power (Pin) is larger than the L-H threshold power (Pth). When Pin = Pth, the confinement is improved step by step, with sawteeth crashes accompanied by a decrease of potential. After a few sawteeth crashes, the potential drops rapidly to the level of the ELM-free H-mode. At that time, the density/temperature fluctuations are suppressed simultaneously. The observations of the temporal behaviour of the potential and fluctuations in such an L-H transition are reported.

Original languageEnglish
Pages (from-to)A309-A315
JournalPlasma Physics and Controlled Fusion
Volume42
Issue numberSUPPL. 5A
DOIs
Publication statusPublished - Jan 1 2000

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Heavy ions
crashes
Ion beams
Temperature
heavy ions
ion beams
thresholds
temperature
probes

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Temporal behaviour of the potential and fluctuations at the L-H transition on JFT-2M. / Ido, T.; Kamiya, K.; Miura, Y.; Hamada, Y.; Nishizawa, A.; Kawasumi, Y.

In: Plasma Physics and Controlled Fusion, Vol. 42, No. SUPPL. 5A, 01.01.2000, p. A309-A315.

Research output: Contribution to journalArticle

Ido, T. ; Kamiya, K. ; Miura, Y. ; Hamada, Y. ; Nishizawa, A. ; Kawasumi, Y. / Temporal behaviour of the potential and fluctuations at the L-H transition on JFT-2M. In: Plasma Physics and Controlled Fusion. 2000 ; Vol. 42, No. SUPPL. 5A. pp. A309-A315.
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