Physics of relativistic electron beams in rectangular and cylindrical geometries

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The use of electron beams for the direct pumping of lasers for fusion applications requires the generation of large area beams in appropriate geometries. Two geometries which are of particular interest are rectangular electron beams with planar anodes and radially converging beams with cyclindrical anodes. The generation of such beams requires the management of electron trajectories in a complex combination of applied and self-generated electric and magnetic fields. The beam's self-electric field limits the emitted current and the deflection of the electron in the self-magnetic field (beam pinch) limits the beam area that can be generated from a single cathode. ... continued below

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Pages: 22

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Schlitt, L.G. & Bradley, L.P. November 1, 1975.

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Description

The use of electron beams for the direct pumping of lasers for fusion applications requires the generation of large area beams in appropriate geometries. Two geometries which are of particular interest are rectangular electron beams with planar anodes and radially converging beams with cyclindrical anodes. The generation of such beams requires the management of electron trajectories in a complex combination of applied and self-generated electric and magnetic fields. The beam's self-electric field limits the emitted current and the deflection of the electron in the self-magnetic field (beam pinch) limits the beam area that can be generated from a single cathode. A simple analytic model is used to derive a scaling relationship for beam pinch in both geometries of the form V/sup 1/2/ w/d = $alpha$ where V is the diode voltage, w the beam width, d the anode-cathode spacing, and $alpha$ is a weak function of the geometry. Numerical calculations are presented to show the effects of nonuniform electric fields encountered in typical geometries together with supporting experimental measurements. (auth)

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Pages: 22

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Dep. NTIS

Source

  • 1. international topical conference on electron beam research and technology, Albuquerque, New Mexico, USA, 3 Nov 1975

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  • Report No.: UCRL--77203
  • Report No.: CONF-751108--10
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4187423
  • Archival Resource Key: ark:/67531/metadc877679

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • November 1, 1975

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 18, 2016, 1:55 p.m.

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Schlitt, L.G. & Bradley, L.P. Physics of relativistic electron beams in rectangular and cylindrical geometries, article, November 1, 1975; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc877679/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.