[Table of Contents]

Plasma and Fusion Research

Volume 2, S1101 (2007)

Regular Articles

Observation of the Effects of Radially Sheared Electric Fields by the Use of a Gold Neutral Beam Probe
Y. MIYATA, T. CHO, M. YOSHIKAWA, Y. NAKASHIMA, M. HIRATA, N. KAIDOU, H. KAKIUCHI, Y. MOTEGI, S. GOSHU, M. MIZUGUCHI, T. NUMAKURA and J. KOHAGURA
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
(Received 5 December 2006 / Accepted 13 April 2007 / Published 20 November 2007)

Abstract

Intermittent turbulent potential fluctuations in ion-cyclotron wave heated plasmas and effects of their suppression due to strongly sheared plasma rotation with electron-cyclotron heating (ECH) for potential formation are observed in GAMMA 10. Such a shear effect on the central-cell potential data is demonstrated by the use of a heavy ion beam probe (HIBP) for the first time in GAMMA 10. The HIBP system with a gold neutral beam is employed for measuring profiles of radially formed potential as well as the associated radially sheared Er in the central cell. During the application of ECH, the produced stronger Er shear results in reduction of the turbulent fluctuations. The results are consistent with reported X-ray tomography data on the effect of Er shear on turbulence suppression.

Keywords

gold neutral beam probe, Er shear, potential fluctuation, x-ray tomography, electron-cyclotron heating

DOI: 10.1585/pfr.2.S1101

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This paper may be cited as follows:

Y. MIYATA, T. CHO, M. YOSHIKAWA, Y. NAKASHIMA, M. HIRATA, N. KAIDOU, H. KAKIUCHI, Y. MOTEGI, S. GOSHU, M. MIZUGUCHI, T. NUMAKURA and J. KOHAGURA, Plasma Fusion Res. 2, S1101 (2007).