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 journalArticlepeer-review

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
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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