Plasma and Fusion Research

Volume 6, 2402088 (2011)

Regular Articles

Confinement of ECH Plasmas and Effect of Electrode Biasing in TOKASTAR-2
Kazuhisa BABA, Kozo YAMAZAKI, Hideki ARIMOTO, Tetsutarou OISHI, Makoto HASEGAWA, Motoki SUWABE and Tatsuo SHOJI
Department of Energy Engineering and Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
(Received 8 December 2010 / Accepted 4 May 2011 / Published 12 July 2011)

Abstract

TOKASTAR-2 device is characterized by a hybrid configuration between tokamak and helical confinement systems with outboard helical field coils. The improvement of plasma confinement by E × B poloidal flow was tried by applying radial electric field with spherical electrode biasing, and the effect of outboard helical magnetic field application was investigated on these electrode biased plasmas. It is measured that plasma radial density profile was improved in spherical electrode biased case, but the density fluctuation including density collapse was induced. This type of fluctuation was reduced by the application of outboard helical magnetic field.

Keywords

TOKASTAR-2, tokamak, helical system, hybrid configuration, spherical electrode biasing, radial electric field, E × B drift, outboard helical field, density fluctuation

DOI: 10.1585/pfr.6.2402088

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This paper may be cited as follows:

Kazuhisa BABA, Kozo YAMAZAKI, Hideki ARIMOTO, Tetsutarou OISHI, Makoto HASEGAWA, Motoki SUWABE and Tatsuo SHOJI, Plasma Fusion Res. 6, 2402088 (2011).