Plasma Gonfinement in an RF-driven Tandem Mirror with a Strong Temperature Anisotropy

In the GAMMA l0 tandem mirror, the axial transport by the excitation of the Alfv6n ion cyclotron (AIC) mode due to strong temperature anisotropy is discussed. The AIC modes are spontaneously excited in the high beta plasmas with a strong temperature anisotropy. The amplitude of the modes can be controlled by changing the cyclotron resonance conditions. The increase of the line density and anisotropy are affected by the excitation of the AIC modes. A resonant interaction between electrons and the AIC modes are observed in the end-loss energy analyzer. Pitch angle scattering ofhigh energy ions trapped magnetically in the central cell and the enhancement of the end loss of high energy ions are also observed experimentally.