Abstract
An experimental study of the interaction at upper hybrid resonance of high-frequency radiation with a low-temperature spatially inhomogeneous plasma is presented. This interaction is investigated through single-pulse-stimulated emission and two pulse echoes which are observed in an afterglow plasma column placed in a uniform, static magnetic field. A theoretical treatment of the linear response of a one-dimensional plasma slab in the zero-temperature approximation is given. This theory predicts that a long-lived radiation signal at the maximum upper hybrid frequency of the inhomogeneous profile is excited by a microwave pulse and decays by phase mixing. Experimental evidence to support the theory is given, especially those aspects which are essential to echo formation. Several nonlinear processes of echo formation are investigated. Based on an approximate collision model for argon, a theory is developed for upper hybrid echoes in a low-density plasma arising from velocity-dependent electron-neutral collisions. The observed echoes in argon are compared both with this theory and with the theory of Blum and Bauer for echoes from nonlinear upper hybrid oscillations. Under our experimental conditions, the collisional nonlinearity dominates.
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