Experimental and theoretical studies of a coaxial free-electron maser based on two-dimensional distributed feedback

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

The first operation of a coaxial free-electron maser (FEM) based on two-dimensional (2D) distributed feedback has been recently observed. Analytical and numerical modeling, as well as measurements, of microwave radiation generated by a FEM with a cavity defined by coaxial structures with a 2D periodic perturbation on the inner surfaces of the outer conductor were carried out. The two-mirror cavity was formed with two 2D periodic structures separated by a central smooth section of coaxial waveguide. The FEM was driven by a large diameter (7 cm), high-current (500 A), annular electron beam with electron energy of 475 keV. Studies of the FEM operation have been conducted. It has been demonstrated that by tuning the amplitude of the undulator or guide magnetic field, modes associated with the different band gaps of the 2D structures were excited. The Ka-band FEM generated 15 MW of radiation with a 6% conversion efficiency, in good agreement with theory.
LanguageEnglish
Pages056406
JournalPhysical Review E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume76
Issue number5
DOIs
Publication statusPublished - Nov 2007

Fingerprint

Coaxial
masers
free electrons
Electron
Cavity
Radiation
cavities
Analytical Modeling
Periodic Structures
Band Gap
high current
Electron Beam
Numerical Modeling
Conductor
conductors
Microwave
tuning
Waveguide
electron beams
electron energy

Keywords

  • bragg structure
  • beam
  • driven
  • laser
  • coaxial free-electron maser
  • microwave radiation

Cite this

@article{21f4d09412c24a23b02a1db87186ee57,
title = "Experimental and theoretical studies of a coaxial free-electron maser based on two-dimensional distributed feedback",
abstract = "The first operation of a coaxial free-electron maser (FEM) based on two-dimensional (2D) distributed feedback has been recently observed. Analytical and numerical modeling, as well as measurements, of microwave radiation generated by a FEM with a cavity defined by coaxial structures with a 2D periodic perturbation on the inner surfaces of the outer conductor were carried out. The two-mirror cavity was formed with two 2D periodic structures separated by a central smooth section of coaxial waveguide. The FEM was driven by a large diameter (7 cm), high-current (500 A), annular electron beam with electron energy of 475 keV. Studies of the FEM operation have been conducted. It has been demonstrated that by tuning the amplitude of the undulator or guide magnetic field, modes associated with the different band gaps of the 2D structures were excited. The Ka-band FEM generated 15 MW of radiation with a 6{\%} conversion efficiency, in good agreement with theory.",
keywords = "bragg structure, beam, driven, laser, coaxial free-electron maser, microwave radiation",
author = "I.V. Konoplev and A.W. Cross and A.D.R. Phelps and W. He and K. Ronald and C.G. Whyte and C.W. Robertson and P. MacInnes",
note = "Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.",
year = "2007",
month = "11",
doi = "10.1103/PhysRevE.76.056406",
language = "English",
volume = "76",
pages = "056406",
journal = "Physical Review E",
issn = "1539-3755",
publisher = "American Physical Society",
number = "5",

}

TY - JOUR

T1 - Experimental and theoretical studies of a coaxial free-electron maser based on two-dimensional distributed feedback

AU - Konoplev, I.V.

AU - Cross, A.W.

AU - Phelps, A.D.R.

AU - He, W.

AU - Ronald, K.

AU - Whyte, C.G.

AU - Robertson, C.W.

AU - MacInnes, P.

N1 - Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.

PY - 2007/11

Y1 - 2007/11

N2 - The first operation of a coaxial free-electron maser (FEM) based on two-dimensional (2D) distributed feedback has been recently observed. Analytical and numerical modeling, as well as measurements, of microwave radiation generated by a FEM with a cavity defined by coaxial structures with a 2D periodic perturbation on the inner surfaces of the outer conductor were carried out. The two-mirror cavity was formed with two 2D periodic structures separated by a central smooth section of coaxial waveguide. The FEM was driven by a large diameter (7 cm), high-current (500 A), annular electron beam with electron energy of 475 keV. Studies of the FEM operation have been conducted. It has been demonstrated that by tuning the amplitude of the undulator or guide magnetic field, modes associated with the different band gaps of the 2D structures were excited. The Ka-band FEM generated 15 MW of radiation with a 6% conversion efficiency, in good agreement with theory.

AB - The first operation of a coaxial free-electron maser (FEM) based on two-dimensional (2D) distributed feedback has been recently observed. Analytical and numerical modeling, as well as measurements, of microwave radiation generated by a FEM with a cavity defined by coaxial structures with a 2D periodic perturbation on the inner surfaces of the outer conductor were carried out. The two-mirror cavity was formed with two 2D periodic structures separated by a central smooth section of coaxial waveguide. The FEM was driven by a large diameter (7 cm), high-current (500 A), annular electron beam with electron energy of 475 keV. Studies of the FEM operation have been conducted. It has been demonstrated that by tuning the amplitude of the undulator or guide magnetic field, modes associated with the different band gaps of the 2D structures were excited. The Ka-band FEM generated 15 MW of radiation with a 6% conversion efficiency, in good agreement with theory.

KW - bragg structure

KW - beam

KW - driven

KW - laser

KW - coaxial free-electron maser

KW - microwave radiation

UR - http://dx.doi.org/10.1103/PhysRevE.76.056406

U2 - 10.1103/PhysRevE.76.056406

DO - 10.1103/PhysRevE.76.056406

M3 - Article

VL - 76

SP - 056406

JO - Physical Review E

T2 - Physical Review E

JF - Physical Review E

SN - 1539-3755

IS - 5

ER -