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Improvement with High Frequency Field of Discharge Plasma by an Electron Beam

We study the plasma discharge process of Ar gas by an electron beam injection parallel to the magnetic field. On the lower magnetic field, waves with low frequency become strongly unstable, the discharge plasma diffuses perpendicularly to the magnetic field by unstable waves and disrupts rapidly in the short time. The unstable waves are identified as the lower hybrid wave. By the external application of high frequency (hf) field near the frequency of Bernstein modes, unstable waves are suppressed, so that the plasma discharge is improved. The suppression of unstable lower hybrid waves occurs, as the frequency of pump hf field is only lower than the frequency of the Bernstein mode. Numerical analyses due to the nonlinear theory explain reasonably the experimental ones.