Abstract
Summary form only given. With increasing external magnetic field, plasma density decreases or saturates at certain critical magnetic field. Drift-wave type instabilities due to density gradient or plasma potential gradient are possible candidates to explain the phenomenon. The threshold magnetic field or frequency is observed to be near lower-hybrid resonance in CMA diagram, and the TG wave disappears beyond the resonance. So, the TG wave may have a potential capability of suppressing the instability in bounded, high-density helicon plasmas as well as heating the plasmas. An additional RF source with different frequency is attempted to stabilize the instability by inducing TG wave. Instabilities and their stabilization in helicon plasmas will be discussed theoretically and experimentally
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