Abstract
Standing wave acoustic fields can segregate partially ionized gas by temperature via a generalized acoustic radiation pressure that we have called the pycnoclinic acoustic force. Thus far, these sound fields have been excited and sustained with a microwave source pulsed near the resonance frequency of a cavity. Consideration of the temperature and luminosity oscillations due to the adiabatic compression of a sound wave suggests an alternative method of driving the sound field necessary for confinement. Acoustic temperature oscillations in the presence of continuous (i.e., not pulsed) microwave fields may cause variable microwave absorption in phase with the acoustic oscillation so as to add energy to the sound field. If the energy added by microwave absorption exceeds that lost to acoustic damping, amplification, and possibly self-oscillation will occur. We give theoretical criteria for amplification and present the apparatus and measurements intended to find signatures of plasma thermoacoustics.
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