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Application of a force-balanced coil to a tokamak device

โœ Scribed by Junji Kondoh; Takashi Fujita; Hiroaki Tsutsui; Yoshihisa Sato; Shunji Tsuji-Iio; Ryuichi Shimada

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
466 KB
Volume
130
Category
Article
ISSN
0424-7760

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โœฆ Synopsis

High field is very favorable for magnetically confined fusion devices such as a tokamak, but electromagnetic force derived from the field becomes a fatal problem. In particular, the largest in-plane centering force hinders toroidal field coils from operating at higher fields. Variable pitch multihelical coils, which we term force-balanced coils (FBCs), by which this force is drastically reduced, are proposed for the coil system of tokamaks. FBCs can also provide poloidal flux swing for plasma breakdown and current induction during the ramp-up phase of the coil current. In this paper, we indicate how to design FBCs for tokamaks. The fusion reactor-size FBCs are designed and compared with that of the conventional toroidal field coil system.

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