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Alfv\'en-ion-cyclotron modes are generated over a wide range of anisotropy parameter β_⊥(T_⊥/T_∥{)}²$ in ICRF-heated central cell plasmas of the GAMMA 10 tandem mirror. The fluctuations are observed at a small driving force in the convectively unstable region predicted theoretically in an infinite plasma. Before reaching the {β} limit of β_⊥=3.52×{}(T_∥/T_⊥{)}²$, above which the absolute instability is predicted, relaxation of pressure anisotropy is observed for the first time by use of an array of diamagnetic loops together with a Faraday cup and secondary-electron emission detectors.
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Ichimura et al. (1993) studied this question.
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