An annular high-current electron beam with an energy spread in a coaxial magnetically insulated diode

A. A. Grishkov, I. V. Pegel

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

An elementary theory of an annular high-current electron beam in a uniform transport channel and a coaxial magnetically insulated diode is generalized to the case of counterpropagating electron beams with a spread over kinetic energies. Expressions for the sum of the absolute values of the forward and backward currents in a uniform transport channel and for the flux of the longitudinal component of the generalized momentum in a coaxial magnetically insulated diode as functions of the maximum electron kinetic energy are derived for different values of the relative width of the energy distribution function. It is shown that, in a diode with an expanding transport channel and a virtual cathode limiting the extracted current, counterpropagating particle flows are established between the cathode and the virtual cathode within a certain time interval after the beginning of electron emission. The accumulation of electrons in these flows is accompanied by an increase in their spread over kinetic energies and the simultaneous decrease in the maximum kinetic energy. The developed model agrees with the results of particle-in-cell simulations performed using the KARAT and OOPIC-Pro codes.

Original languageEnglish
Pages (from-to)936-946
Number of pages11
JournalPlasma Physics Reports
Volume39
Issue number11
DOIs
Publication statusPublished - 1 Nov 2013

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high current
kinetic energy
diodes
electron beams
cathodes
energy
electron emission
energy distribution
electrons
distribution functions
intervals
momentum
cells
simulation

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics

Cite this

An annular high-current electron beam with an energy spread in a coaxial magnetically insulated diode. / Grishkov, A. A.; Pegel, I. V.

In: Plasma Physics Reports, Vol. 39, No. 11, 01.11.2013, p. 936-946.

Research output: Contribution to journalArticle

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