[Table of Contents]

Plasma and Fusion Research

Volume 1, 036 (2006)


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)


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.


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

DOI: 10.1585/pfr.1.036


  • [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).