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Title: Dynamics of a low pressure discharge at extremely low voltages
Author: Nilson, John Anthony
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1965
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This thesis is concerned with the study of the low pressure dark discharge in an inert gas thermionic converter. This low energy plasma is supplied with ions from an external source which neutralizes the space charge in the emitter-collector (cathode-anode) space. The work is mainly of an experimental nature, and many results of the measurements are included. Probe measurements were made and the errors involved are carefully examined. It is found that in general simple probe measurements in such a plasma are not to be trusted:-The discharge was examined by other methods, the most useful being with probes set flush in the collector. These probes could be used as anodes to supply ions or as isolated patches in the collector to measure the current distribution under various conditions. A new method of supplying ions to the discharge by means of positive anodes was examined. It was found to be more useful than the auxiliary discharge space which was used at the beginning of this work. A detailed description of the design considerations of: the final tube is given, including vacuum equipment, mechanical design, and cleaning and assembly procedures. The theory of operation of the device was examined and a simple theory was developed which explains the operation and most of the results.
Supervisor: Gabor, D. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available