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Initial Plasma Confinement Experiments in Tokamak-Helical Hybrid Device TOKASTAR-2

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

Department of Energy Engineering and Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

(Received 9 December 2009 / Accepted 20 April 2010 / Published 10 December 2010)

Abstract

A tokamak-helical hybrid device TOKASTAR-2 with outboard helical field coils located outside the toroidal field coil system was constructed. Initial plasmas are produced by the electron cyclotron heating scheme, and the plasma electron density profile is measured using electrostatic double Langmuir probes. The peak location of measured electron density profile in the radial direction agrees with the first electron cyclotron resonance layer at initial beak-down period and at final disappearance period of the plasma discharge. The suppression of bursting electron density oscillations and the shift of plasma density profile are observed in the case of applying outboard helical magnetic field.

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

Keywords

tokastar-2, tokamak, helical system, hybrid configuration, Langmuir probe, electron cyclotron heating, electron density profile

DOI: 10.1585/pfr.5.S2036

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References

• [1] K. Yamazaki and Y. Abe, “Tokastar: Tokamak-Stellarator Hybrid with Possible Bean-Shaped Operation”, Research Report of the Institute of Plasma Physics, Nagoya, Japan, IPPJ-718 (1985).
• [2] K. Yamazaki, Y. Taira, T. Oishi, H. Arimoto and T. Shoji, J. Plasma Fusion Res. SERIES 8, 1044 (2009).

This paper may be cited as follows:

Kazuhisa BABA, Kozo YAMAZAKI, Hideki ARIMOTO, Tetsutarou OISHI, Koki OKANO, Makoto HASEGAWA and Tatsuo SHOJI, Plasma Fusion Res. 5, S2036 (2010).