Electrostatic oscillations are excited in a cylindrical shell of plasma by an electron beam which passes through the plasma with a helical trajectory. A non-convective instability results in an unstable wave which propagates in the same azimuthal direction, and in the opposite axial direction, as the electron beam. The qualitative behaviour of the instability is in agreement with the theoretical predictions, and the frequency and wavelength of the unstable wave agree with calculated values to within 25 per cent.
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David L. Morse (1967) studied this question.
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