Change in edge fluctuations synchronized with heat pulse in the JFT-2M tokamak

Yoshihiko Nagashima, Kimitaka Itoh, Sanae I. Itoh, Akihide Fujisawa, Katsumichi Hoshino

Research output: Contribution to journalReview article

Abstract

The change in edge fluctuations synchronized with a heat pulse during Sawtooth oscillation has been investigated in the JFT-2M tokamak using a reciprocating Langmuir probe. Data window of a heat pulse is segmented into a number of time frames, and time traces of auto-power spectra at each frame are calculated. Conditional averaging over a number of heat pulse events in a single discharge is performed in order to reduce the variance of the fluctuation spectra. At each heat pulse event, a reduction in the geodesic acoustic mode fluctuation power and an increase in the turbulence fluctuation power are observed. The change in the fluctuation powers suggests that the edge heat pulse during Sawtooth instability could affect the edge turbulence structure.

Original languageEnglish
Article number063501
Journaljournal of the physical society of japan
Volume85
Issue number6
DOIs
Publication statusPublished - Jun 15 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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