The equilibrium and wave properties of cylindrical, magnetically confined, low-temperature, nonneutral plasma are investigated experimentally. These results are compared with a uniform radial density cold-fluid theory, rigid-rotor model that predicts equilibrium angular rotation frequencies of θ̇= (ωc/2) [1± (1−2ω2p0/ω2c)1/2]. The nonneutral plasma is created by injecting an electron beam through a nonadiabatic field step into a uniform magnetic field. Fast mode (+ sign) and slow mode (− sign) equilibria are investigated by measuring the average rotation frequency for various densities up to the limiting condition ω2p0=ω2c/2. Most of the essential features of these equilibria are verified. Azimuthally symmetric plasma waves are investigated for four equilibrium conditions. The measured phase characteristics of these waves agree with those predicted using a cold-fluid theory for a nonneutral plasma. These measurements confirm that plasma waves propagate in the absence of background neutralizing ions.
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Theiss et al. (1977) studied this question.
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