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Fore-vacuum plasma-cathode electron sources

Published online by Cambridge University Press:  12 November 2008

V.A. Burdovitsin
Affiliation:
Tomsk State University of Control Systems and Radioelectronics, Tomsk, Russia
E.M. Oks*
Affiliation:
Tomsk State University of Control Systems and Radioelectronics, Tomsk, Russia
*
Address correspondence and reprint requests to: Efim Oks, Tomsk State University of Control Systems and Radio-electronics, 40 Lenin Ave., 634050 Tomsk, Russia. E-mail: oks@fet.tusur.ru

Abstract

This paper presents a review of physical principles, design, and performances of plasma-cathode direct current (dc) electron beam guns operated in so called fore-vacuum pressure (1–15 Pa). That operation pressure range was not reached before for any kind of electron sources. A number of unique parameters of the e-beam were obtained, such as electron energy (up to 25 kV), dc beam current (up 0.5 A), and total beam power (up to 7 kW). For electron beam generation at these relatively high pressures, the following special features are important: high probability of electrical breakdown within the accelerating gap, a strong influence of back-streaming ions on both the emission electrode and the emitting plasma, generation of secondary plasma in the beam propagation region, and intense beam-plasma interactions that lead in turn to broadening of the beam energy spectrum and beam defocusing. Yet other unique peculiarities can occur for the case of ribbon electron beams, having to do with local maxima in the lateral beam current density distribution. The construction details of several plasma-cathode electron sources and some specific applications are also presented.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2008

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