TY - JOUR
T1 - Change in edge fluctuations synchronized with heat pulse in the JFT-2M tokamak
AU - Nagashima, Yoshihiko
AU - Itoh, Kimitaka
AU - Itoh, Sanae I.
AU - Fujisawa, Akihide
AU - Hoshino, Katsumichi
N1 - Funding Information:
This work was partially supported by Grants-in-Aid for Scientific Research (26420852, 15H02155) from MEXT, Japan. This work was also partially supported by a collaboration program between JAEA, NIFS, and Kyushu University. We also appreciate discussions with Professor Inagaki, Associate Professor Kasuya, Assistant Professor Kosuga, Assistant Professor Sasaki of Kyushu University, and Professor Dong, Professor Zhao, and Professor Cheng in Southwestern Institute of Physics of Chengdu, China.
Publisher Copyright:
©2016 The Physical Society of Japan.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2016/6/15
Y1 - 2016/6/15
N2 - 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.
AB - 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.
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U2 - 10.7566/JPSJ.85.063501
DO - 10.7566/JPSJ.85.063501
M3 - Review article
AN - SCOPUS:84973901093
SN - 0031-9015
VL - 85
JO - journal of the physical society of japan
JF - journal of the physical society of japan
IS - 6
M1 - 063501
ER -