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(EXP4/17) Additional Heating Experiments of FRC Plasma

S. Okada¹⁾, T. Asai¹⁾, F. Kodera¹⁾, K. Kitano¹⁾, T. Suzuki¹⁾, K. Yamanaka¹⁾, T. Kanki¹⁾, M. Inomoto¹⁾, S. Yoshimura¹⁾, M. Okubo¹⁾, S. Sugimoto¹⁾, S. Ohi¹⁾, S. Goto^1)
 
1) Plasma Physics Laboratory, Graduate School of Engineering, Osaka University, Osaka, Japan

Abstract.  Additional heating experiments of neutral beam (NB) injection and application of low frequency wave on a plasma with extremely high averaged beta value of about 90% ­- a field reversed configuration (FRC) plasma ­- are carried out on the FRC Injection experiment (FIX) apparatus. These experiments are made possible by translating the FRC plasma produced in a formation region of a theta pinch to a confinement region in order to secure better accessibility to heating facilities and to control plasma density. By appropriate choice of injection geometry and the mirror ratio of the confinement region, the NB with the energy of 14keV and the current of 23A is enabled to be injected into the FRC in the solenoidal confining field of only 0.04-0.05T. Confinement is improved by this experiment. Ion heating is observed by the application of low frequency (80kHz ; about 1/4 of the ion gyro frequency) compressional wave. A shear wave, probably mode converted from the compressional wave, is detected to propagate axially.

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