Theory of free-electron maser with two-dimensional distributed feedback driven by an annular electron beam

N S Ginzburg, N Y Peskov, A S Sergeev, I V Konoplev, A W Cross, A D R Phelps, G R M Robb, K Ronald, W He, C G Whyte

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

The use of two-dimensional (2D) distributed feedback is considered as a method of providing spatially coherent radiation from an oversized annular electron beam. To realize the feedback mechanism, 2D Bragg structures formed from doubly-corrugated waveguide sections of coaxial geometry are suggested. The properties of two types of coaxial cavities formed using such structures are compared: a single-section 2D Bragg cavity and a two-mirror cavity. The eigenmodes of both cavities are found and their high selectivity over both azimuthal and longitudinal indices was demonstrated. Time-domain analyses of the excitation of the cavities by an annular electron beam were carried out. The influence of the cavity parameters on the oscillation regime is analyzed and discussed. It was shown that for a specific set of 2D Bragg cavity parameters it is possible to obtain a regime of steady-state oscillations when the transverse size of the beam exceeds the wavelength by a few orders of magnitude, while outside this parameter space multimode oscillation takes place. The design of a 2D Bragg free-electron maser oscillator based on a high-current accelerator at the University of Strathclyde is discussed. (C) 2002 American Institute of Physics.

LanguageEnglish
Pages1619-1629
Number of pages11
JournalJournal of Applied Physics
Volume92
Issue number3
DOIs
Publication statusPublished - 1 Aug 2002

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masers
free electrons
electron beams
cavities
oscillations
corrugated waveguides
coherent radiation
high current
accelerators
selectivity
oscillators
mirrors
geometry
wavelengths
excitation

Keywords

  • Bragg resonators
  • 2D Bragg
  • FEL
  • free electron masers
  • emission
  • 2D distributed feedback cavity
  • millimetre wave devices
  • microwave cavity

Cite this

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title = "Theory of free-electron maser with two-dimensional distributed feedback driven by an annular electron beam",
abstract = "The use of two-dimensional (2D) distributed feedback is considered as a method of providing spatially coherent radiation from an oversized annular electron beam. To realize the feedback mechanism, 2D Bragg structures formed from doubly-corrugated waveguide sections of coaxial geometry are suggested. The properties of two types of coaxial cavities formed using such structures are compared: a single-section 2D Bragg cavity and a two-mirror cavity. The eigenmodes of both cavities are found and their high selectivity over both azimuthal and longitudinal indices was demonstrated. Time-domain analyses of the excitation of the cavities by an annular electron beam were carried out. The influence of the cavity parameters on the oscillation regime is analyzed and discussed. It was shown that for a specific set of 2D Bragg cavity parameters it is possible to obtain a regime of steady-state oscillations when the transverse size of the beam exceeds the wavelength by a few orders of magnitude, while outside this parameter space multimode oscillation takes place. The design of a 2D Bragg free-electron maser oscillator based on a high-current accelerator at the University of Strathclyde is discussed. (C) 2002 American Institute of Physics.",
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Theory of free-electron maser with two-dimensional distributed feedback driven by an annular electron beam. / Ginzburg, N S ; Peskov, N Y ; Sergeev, A S ; Konoplev, I V ; Cross, A W ; Phelps, A D R ; Robb, G R M ; Ronald, K ; He, W ; Whyte, C G .

In: Journal of Applied Physics, Vol. 92, No. 3, 01.08.2002, p. 1619-1629.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Theory of free-electron maser with two-dimensional distributed feedback driven by an annular electron beam

AU - Ginzburg, N S

AU - Peskov, N Y

AU - Sergeev, A S

AU - Konoplev, I V

AU - Cross, A W

AU - Phelps, A D R

AU - Robb, G R M

AU - Ronald, K

AU - He, W

AU - Whyte, C G

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Y1 - 2002/8/1

N2 - The use of two-dimensional (2D) distributed feedback is considered as a method of providing spatially coherent radiation from an oversized annular electron beam. To realize the feedback mechanism, 2D Bragg structures formed from doubly-corrugated waveguide sections of coaxial geometry are suggested. The properties of two types of coaxial cavities formed using such structures are compared: a single-section 2D Bragg cavity and a two-mirror cavity. The eigenmodes of both cavities are found and their high selectivity over both azimuthal and longitudinal indices was demonstrated. Time-domain analyses of the excitation of the cavities by an annular electron beam were carried out. The influence of the cavity parameters on the oscillation regime is analyzed and discussed. It was shown that for a specific set of 2D Bragg cavity parameters it is possible to obtain a regime of steady-state oscillations when the transverse size of the beam exceeds the wavelength by a few orders of magnitude, while outside this parameter space multimode oscillation takes place. The design of a 2D Bragg free-electron maser oscillator based on a high-current accelerator at the University of Strathclyde is discussed. (C) 2002 American Institute of Physics.

AB - The use of two-dimensional (2D) distributed feedback is considered as a method of providing spatially coherent radiation from an oversized annular electron beam. To realize the feedback mechanism, 2D Bragg structures formed from doubly-corrugated waveguide sections of coaxial geometry are suggested. The properties of two types of coaxial cavities formed using such structures are compared: a single-section 2D Bragg cavity and a two-mirror cavity. The eigenmodes of both cavities are found and their high selectivity over both azimuthal and longitudinal indices was demonstrated. Time-domain analyses of the excitation of the cavities by an annular electron beam were carried out. The influence of the cavity parameters on the oscillation regime is analyzed and discussed. It was shown that for a specific set of 2D Bragg cavity parameters it is possible to obtain a regime of steady-state oscillations when the transverse size of the beam exceeds the wavelength by a few orders of magnitude, while outside this parameter space multimode oscillation takes place. The design of a 2D Bragg free-electron maser oscillator based on a high-current accelerator at the University of Strathclyde is discussed. (C) 2002 American Institute of Physics.

KW - Bragg resonators

KW - 2D Bragg

KW - FEL

KW - free electron masers

KW - emission

KW - 2D distributed feedback cavity

KW - millimetre wave devices

KW - microwave cavity

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