NIFS-562

FULL TEXT (PDF, 490 KB)


Author(s):

S. Yoshikawa

Title:

Next Generation Toroidal Devices

Date of publication:

Oct. 1998

Key words:

Toroidal plasma confinements, tokamak, stellarator, heliac, toroidal stability, toroidal equilibrium, super conducting coils

Abstract:

A general survey of the possible approach for the next generation toroidal devices was made Either surprisingly or obviously (depending on one's view), the technical constraints along with the scientific considerations lead to a fairly limited set of systems for the most favorable approach for the next generation devices. Specifically if the magnetic field strength of 5 T or above is to be created by superconducting coils, it imposes minimum in the aspect ratio for the tokamak which is slightly higher than contemplated now for INTER design. The similar technical constraints make the minimum linear size of a stellarator large. Scientifically, it is indicated that a tokamak of 1.5 times in the linear dimension should be able to produce economically, especially if a hybrid reactor is allowed. For the next stellarator, it is strongly suggested that some kind of helical axis is necessary both for the (almost) absolute confinement of high energy particles and high stability and equilibrium beta limits. The author still favors a heliac most. Although it may not have been clearly stated in the main text, the stability afforded by the shearless layer may be exploited fully in a stellarator.

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