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Construction and Plasma Initiation of the Tokamak-Helical Hybrid Device TOKASTAR-2

Koki OKANO, Kozo Yamazaki, Hideki ARIMOTO, Tetsutarou OISHI, Kazuhisa BABA, Makoto HASEGAWA and Tatsuo SHOJI

Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan

(Received 9 December 2009 / Accepted 23 April 2010 / Published 10 December 2010)

Abstract

TOKASTAR, a hybrid magnetic configuration between tokamak and stellarator, has been proposed for the study of magnetic confinement optimization. The construction of the small device named TOKASTAR-2 was started in April 2008, and completed in March 2009. As a preliminary experiment, spatial distribution of electron temperature (T_e) and electron density (n_e) are measured in a simple toroidal magnetic field configuration. Initial ECH plasmas with T_e ∼ 10 eV, n_e ∼ 10¹⁶ m⁻³ are confirmed. In the preliminary experiment of ohmic heating plasma production, plasma current (I_p) of 25 A is observed. The plasma equilibrium is calculated by the TOSCA code, and the magnetic flux surface and optimal vertical field coil currents are clarified for the future experiment.

Copyright (c) 2010 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

TOKASTAR, tokamak-stellarator, ECH (electron cyclotron heating) plasma, OH (ohmic heating) plasma, Plasma current, one-turn voltage, TOSCA code

DOI: 10.1585/pfr.5.S2037

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References

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This paper may be cited as follows:

Koki OKANO, Kozo Yamazaki, Hideki ARIMOTO, Tetsutarou OISHI, Kazuhisa BABA, Makoto HASEGAWA and Tatsuo SHOJI, Plasma Fusion Res. 5, S2037 (2010).