Stability of Beam-Induced Tensor-Pressure Tokamaks

Abstract

Necessary and sufficient criteria are obtained for the high-toroidal-mode-number stability of a guiding-center plasma in low-aspect-ratio, D-shaped, beam-induced tensor-pressure tokamaks. The difference between the two criteria is significant for interchange stability, while the difference is small for ballooning stability. The critical $\beta$ value imposed by stability to ballooning modes is higher for perpendicular than for parallel beam injection.