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Factors Determining Decay-Index Distribution and Contribution of a Central Solenoid on a Spherical Tokamak

Kichiro SHINYA

AITEL Corporation

(Received 23 January 2006 / Accepted 30 May 2006 / Published 18 July 2006)

Abstract

Factors that dominate achievement of the decay-index (or N-index) distribution required for highly elongated divertor plasmas with large triangularity are studied. The outermost coil is regarded as a leading candidate, but can supply only a part of the equilibrium value. Current in Central Solenoid with the same direction as the outermost coil current is found to fill the difference of the decay-index distribution on the mid-plane between the equilibrium magnetic field and the outermost coil field.

Copyright (c) 2006 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

spherical tokamak, elongated plasma, triangularity, equilibrium field, decay-index, poloidal field coil, central solenoid

DOI: 10.1585/pfr.1.036

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References

• [1] K. Shinya, J. Plasma Fusion Res. 80, 949 (2004) in Japanese

This paper may be cited as follows:

Kichiro SHINYA, Plasma Fusion Res. 1, 036 (2006).