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; J. KOHAGURA

doi:10.1585/pfr.2.S1101

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, J. KOHAGURA

Author information

Y. MIYATA
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
T. CHO
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
M. YOSHIKAWA
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
Y. NAKASHIMA
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
M. HIRATA
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
N. KAIDOU
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
H. KAKIUCHI
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
Y. MOTEGI
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
S. GOSHU
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
M. MIZUGUCHI
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
T. NUMAKURA
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
J. KOHAGURA
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan

Keywords: gold neutral beam probe, E_r shear, potential fluctuation, x-ray tomography, electron-cyclotron heating

JOURNAL FREE ACCESS

2007 Volume 2 Pages S1101

DOI https://doi.org/10.1585/pfr.2.S1101

Details

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 E_r in the central cell. During the application of ECH, the produced stronger E_r shear results in reduction of the turbulent fluctuations. The results are consistent with reported X-ray tomography data on the effect of E_r shear on turbulence suppression.

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