High-current electron beams for high-power free-electron masers based on two-dimensional periodic lattices

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Abstract

High-power gigawatt-level radiation can be generated by the interaction of an electromagnetic wave and an annular electron beam with a transverse dimension much larger than the operating wavelength. The use of such a large-circumference annular beam allows the generation of high beam currents while also maintaining low space charge and RF power densities inside the interaction region. This circumvents the problems associated with potential depression in the beam channel and RF breakdown inside the oscillator. In this paper, we present the studies of high-current magnetically confined annular electron beams and discuss their production and transportation through a coaxial beam channel which formed the interaction region of a free-electron maser (FEM). The results from numerical simulations, using the software packages KARAT and MAGIC, are compared with the experimental measurements. The operation of a FEM, driven by a high-current annular electron beam, is presented, and the tunability of the maser, inside a frequency range defined by an input 2-D Bragg mirror, is demonstrated.

LanguageEnglish
Pages751-763
Number of pages13
JournalIEEE Transactions on Plasma Science
Volume38
Issue number4
DOIs
Publication statusPublished - Apr 2010

Fingerprint

masers
free electrons
high current
electron beams
circumferences
interactions
Bragg reflectors
beam currents
radiant flux density
space charge
electromagnetic radiation
breakdown
frequency ranges
oscillators
computer programs
radiation
wavelengths
simulation

Keywords

  • distributed feedback laser
  • free-electron maser (FEM)
  • high-current electron beam
  • surface periodic lattice
  • spatially coherent radiation
  • distributed feedback
  • bragg resonators
  • mode competition
  • lasers
  • generation
  • instability
  • reflectors
  • surface
  • oroton

Cite this

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title = "High-current electron beams for high-power free-electron masers based on two-dimensional periodic lattices",
abstract = "High-power gigawatt-level radiation can be generated by the interaction of an electromagnetic wave and an annular electron beam with a transverse dimension much larger than the operating wavelength. The use of such a large-circumference annular beam allows the generation of high beam currents while also maintaining low space charge and RF power densities inside the interaction region. This circumvents the problems associated with potential depression in the beam channel and RF breakdown inside the oscillator. In this paper, we present the studies of high-current magnetically confined annular electron beams and discuss their production and transportation through a coaxial beam channel which formed the interaction region of a free-electron maser (FEM). The results from numerical simulations, using the software packages KARAT and MAGIC, are compared with the experimental measurements. The operation of a FEM, driven by a high-current annular electron beam, is presented, and the tunability of the maser, inside a frequency range defined by an input 2-D Bragg mirror, is demonstrated.",
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author = "Konoplev, {Ivan V.} and Philip MacInnes and Cross, {Adrian W.} and Lorna Fisher and Phelps, {Alan D. R.} and Wenlong He and Kevin Ronald and Whyte, {Colin G.} and Robertson, {Craig W.}",
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AU - Konoplev, Ivan V.

AU - MacInnes, Philip

AU - Cross, Adrian W.

AU - Fisher, Lorna

AU - Phelps, Alan D. R.

AU - He, Wenlong

AU - Ronald, Kevin

AU - Whyte, Colin G.

AU - Robertson, Craig W.

PY - 2010/4

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N2 - High-power gigawatt-level radiation can be generated by the interaction of an electromagnetic wave and an annular electron beam with a transverse dimension much larger than the operating wavelength. The use of such a large-circumference annular beam allows the generation of high beam currents while also maintaining low space charge and RF power densities inside the interaction region. This circumvents the problems associated with potential depression in the beam channel and RF breakdown inside the oscillator. In this paper, we present the studies of high-current magnetically confined annular electron beams and discuss their production and transportation through a coaxial beam channel which formed the interaction region of a free-electron maser (FEM). The results from numerical simulations, using the software packages KARAT and MAGIC, are compared with the experimental measurements. The operation of a FEM, driven by a high-current annular electron beam, is presented, and the tunability of the maser, inside a frequency range defined by an input 2-D Bragg mirror, is demonstrated.

AB - High-power gigawatt-level radiation can be generated by the interaction of an electromagnetic wave and an annular electron beam with a transverse dimension much larger than the operating wavelength. The use of such a large-circumference annular beam allows the generation of high beam currents while also maintaining low space charge and RF power densities inside the interaction region. This circumvents the problems associated with potential depression in the beam channel and RF breakdown inside the oscillator. In this paper, we present the studies of high-current magnetically confined annular electron beams and discuss their production and transportation through a coaxial beam channel which formed the interaction region of a free-electron maser (FEM). The results from numerical simulations, using the software packages KARAT and MAGIC, are compared with the experimental measurements. The operation of a FEM, driven by a high-current annular electron beam, is presented, and the tunability of the maser, inside a frequency range defined by an input 2-D Bragg mirror, is demonstrated.

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KW - bragg resonators

KW - mode competition

KW - lasers

KW - generation

KW - instability

KW - reflectors

KW - surface

KW - oroton

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