Abstract
The experimental observations concern particular microinstability modes found in a short, highly anisotropic (T‖/T⌋ ≈ 0.005), hot ion plasma (ωpe ≳ ωci > ω ωpi) formed by fast H0 injection into a simple magnetic mirror field. These modes were characterized by Bθ probe signals at ion gyrofrequencies and also at discrete sidebands of comparable amplitude about the gyrofrequencies. Sidebands were related to mirror bounce motions of the ions by experiments using different magnetic field gradients. The presence of high amplitude sidebands and observations of an antisymmetric axial potential distribution associated with one of the oscillations indicated that the modes were those of Harris instability rather than of negative mass. Comparisons of observations with results of numerical studies of Harris instability in infinite media and with finite length effects confirmed the assignment.
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