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Propagation of Low Frequency Waves in a Plasma Column.

Purcell, Jeffrey John. (1968) Propagation of Low Frequency Waves in a Plasma Column. Doctoral thesis, University of Surrey (United Kingdom)..

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In this thesis, an investigation has been made into the propagation of low frequency waves along the positive column of a cylindrical gaseous discharge. The ion acoustic wave has been successfully detected by previous workers and shown to be in good agreement with theoretical predictions. However, it can be shown that under a favourable combination of the type of gas, the pressure and the column geometry, a mode propagates with little or no attenuation in the electron stream directions and with a very high attentuation in the opposite direction. The anode directed wave is of the 'backward' type, as an increase of frequency corresponds to an increase of wavelength. It has been possible to show that by including collisional losses in the equations of motion for the electrons and ions and deriving the appropriate plasma permittivity expression, dispersion solutions for a circularly symmetric longitudinal mode do exhibit a backward slope and anomolous propagation characteristics providing that the electron drift velocity is of the order of the thermal velocity. Experiments have shown that these waves exist in Neon over the pressure range 0.1 to 0.03 mM. Hg. with a discharge current of 100 mA., and measurements of the. plasma parameters have shown that the necessary conditions are satisfied in the discharge system investigated.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
Purcell, Jeffrey John.
Date : 1968
Contributors :
Additional Information : Thesis (Ph.D.)--University of Surrey (United Kingdom), 1968.
Depositing User : EPrints Services
Date Deposited : 22 Jun 2018 15:15
Last Modified : 06 Nov 2018 16:54

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