Wide-aperture electron source with a plasma grid emitter

T. V. Koval, M. S. Vorobyov, Nguyen Bao Hung

Research output: Contribution to journalArticle

Abstract

This paper presents a theoretical and experimental investigation of the formation and transport of a large cross-section beam in a low-pressure gas, the discharge plasma characteristics in an electron source with a plasma emitter and beam extraction into the atmosphere through a thin foil. In such a source, the electron beam is a superposition of elementary beams formed by separate emission structures, the plasma boundary of which is stabilized by a fine metal grid. In experiments at an accelerating voltage of 200 kV, emission current of 16 A, and pulse duration of 40 μs, about 4 kW of the beam average power is extracted from the accelerating gap into the atmosphere at the geometric transparency of a supporting grid of the exit foil window equal to 56%. Numerical investigation of the discharge plasma generation, formation and transport of an electron beam also is carried out. It is shown that the characteristics of the discharge plasma depend on the resistance in the hollow anode circuit of the discharge system and on the mask surface area. The main beam current losses are associated with the expansion of the elementary electron beams cross section in the accelerating gap, plasma flowing-in behind the mask, ion current, and losses on the foil.

Original languageEnglish
Pages (from-to)77-84
Number of pages8
JournalHigh Temperature Material Processes
Volume19
Issue number1
DOIs
Publication statusPublished - 2015

Fingerprint

Electron sources
electron sources
emitters
apertures
grids
Plasmas
foils
Metal foil
electron beams
Electron beams
plasma jets
masks
Masks
atmospheres
Particle beam extraction
plasma generators
Plasma Gases
cross sections
beam currents
ion currents

Keywords

  • Accelerating gap
  • Beam current loss
  • Beam extraction into the atmosphere
  • Electron beam source
  • Plasma grid emitter

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering(all)
  • Materials Science(all)
  • Energy Engineering and Power Technology
  • Spectroscopy
  • Physical and Theoretical Chemistry

Cite this

Wide-aperture electron source with a plasma grid emitter. / Koval, T. V.; Vorobyov, M. S.; Hung, Nguyen Bao.

In: High Temperature Material Processes, Vol. 19, No. 1, 2015, p. 77-84.

Research output: Contribution to journalArticle

Koval, T. V. ; Vorobyov, M. S. ; Hung, Nguyen Bao. / Wide-aperture electron source with a plasma grid emitter. In: High Temperature Material Processes. 2015 ; Vol. 19, No. 1. pp. 77-84.
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