Abstract

The operation of a tandem mirror using Ion Cyclotron Range of Frequencies (ICRF) waves and limiter biasing is performed in the HIEI tandem mirror. An ion confining potential is formed in the plug cell by high-field-side injection of the fast magnetosonic wave. Limiter biasing is simultaneously imposed with formation of a confining potential and minority heating in the central cell, and both axial and radial confinement are enhanced by a factor of 4. As a result, a high-beta plasma (∼14%) is produced in the central cell. The high-beta plasma is sustained magnetohydrodynamically by ponderomotive force of ICRF electric fields.

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