Emittance growth of an nonequilibrium intense electron beam in a transport channel with discrete focusing

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The author analyzes the emittance growth mechanisms for a continuous, intense electron beam in a focusing transport channel, over distances short enough that the beam does not reach equilibrium. The emittance grows from the effect of nonlinear forces arising from (1) current density nonuniformities, (2) energy variations leading to nonlinearities in the space-charge force even if the current density is uniform, (3) axial variations in the radial vector potential, (4) an axial velocity shear along the beam, and (5) an energy redistribution of the beam as the beam compresses or expands. The emittance growth is studied analytically and numerically for ... continued below

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64 p.

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Carlsten, B.E. February 1, 1997.

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Description

The author analyzes the emittance growth mechanisms for a continuous, intense electron beam in a focusing transport channel, over distances short enough that the beam does not reach equilibrium. The emittance grows from the effect of nonlinear forces arising from (1) current density nonuniformities, (2) energy variations leading to nonlinearities in the space-charge force even if the current density is uniform, (3) axial variations in the radial vector potential, (4) an axial velocity shear along the beam, and (5) an energy redistribution of the beam as the beam compresses or expands. The emittance growth is studied analytically and numerically for the cases of balanced flow, tight focusing, and slight beam scalloping, and is additionally studied numerically for an existing 6-MeV induction linear accelerator. Rules for minimizing the emittance along a beamline are established. Some emittance growth will always occur, both from current density nonuniformities that arise along the transport and from beam radius changes along the transport.

Physical Description

64 p.

Notes

OSTI as DE97002946

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  • Other Information: PBD: [1997]

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  • Other: DE97002946
  • Report No.: LA-UR--96-3982
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/434425 | External Link
  • Office of Scientific & Technical Information Report Number: 434425
  • Archival Resource Key: ark:/67531/metadc683796

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Creation Date

  • February 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 25, 2016, 4:17 p.m.

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Carlsten, B.E. Emittance growth of an nonequilibrium intense electron beam in a transport channel with discrete focusing, report, February 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc683796/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.