LINEAR ELECTROSTATIC INSTABILITY OF THE ELECTRON BEAM ION SOURCE

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Linear plasma fluid theory is used to study the stability of a cold electron beam in Brillouin equilibrium which passes through a stationary cold ion background, with particular interest in stability for parameters relevant to EBIS devices. Dispersion is studied both analytically and numerically. For {ell}=0, the usual infinite medium two stream instability condition is shown to correspond to a requirement that beam perveance exceed a minimum value, P>33 {micro}pervs; hence, this mode is stable for EBIS (P {approx} l{micro}perv). The Brillouin equilibrium rotation is shown to cause an electron-ion rotating stream instability, which is convectively unstable. The {ell}=1 mode ... continued below

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16 p.

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Litwin, C.; Vella, M.C. & Sessler, A. December 1, 1981.

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Description

Linear plasma fluid theory is used to study the stability of a cold electron beam in Brillouin equilibrium which passes through a stationary cold ion background, with particular interest in stability for parameters relevant to EBIS devices. Dispersion is studied both analytically and numerically. For {ell}=0, the usual infinite medium two stream instability condition is shown to correspond to a requirement that beam perveance exceed a minimum value, P>33 {micro}pervs; hence, this mode is stable for EBIS (P {approx} l{micro}perv). The Brillouin equilibrium rotation is shown to cause an electron-ion rotating stream instability, which is convectively unstable. The {ell}=1 mode is also found to be unstable. Higher modes numbers, {ell}>1, are unstable, but have reduced growth. Instability is only weakly affected by finite beam radius and boundary conditions.

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16 p.

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  • Journal Name: Nuclear Instruments and Methods

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  • Report No.: LBL-13770
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 937097
  • Archival Resource Key: ark:/67531/metadc893276

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  • December 1, 1981

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, noon

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Litwin, C.; Vella, M.C. & Sessler, A. LINEAR ELECTROSTATIC INSTABILITY OF THE ELECTRON BEAM ION SOURCE, article, December 1, 1981; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc893276/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.