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Confinement Analysis of Spherical Tokamak-Stellarator Hybrid Configurations with Simple Shaped Coils

Hidemasa OZEKI, Kozo YAMAZAKI, Hideki ARIMOTO, Tetsutarou OISHI, Tatsuo SHOJI and Mikhail Ivanivich MIKHAILOV¹⁾

Nagoya University, Nagoya 464-8603, Japan

1)

Russian Research Centre “Kurchatov Institute”, Moscow, Russia

(Received 9 December 2011 / Accepted 27 June 2012 / Published 15 October 2012)

Abstract

Six types of spherical tokamak-stellarator hybrid configurations with simple shaped coils “TOKASTAR”, are proposed and analyzed in terms of magnetic flux surface, equilibrium and fast particle confinement. It was found that TOKASTAR can produce flux surfaces with low averaged aspect ratio. The averaged rotational transform are low but local value is relatively high, especially at the outboard side. In the equilibrium beta limit analysis it was clarified that TOKASTAR can achieve high equilibrium beta with relatively low plasma current. In the fast particle confinement analysis, it was found that the fraction of confined alpha particles in the reactor-sized TOKASTAR is 40∼60%.

Copyright (c) 2012 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

tokamak, stellarator, TOKASTAR, magnetic flux surface, low aspect ratio, alpha particle confinement

DOI: 10.1585/pfr.7.2403144

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References

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This paper may be cited as follows:

Hidemasa OZEKI, Kozo YAMAZAKI, Hideki ARIMOTO, Tetsutarou OISHI, Tatsuo SHOJI and Mikhail Ivanivich MIKHAILOV, Plasma Fusion Res. 7, 2403144 (2012).