Experimental study of coaxial free-electron maser based on two-dimensional distributed feedback

I.V. Konoplev, P. McGrane, W. He, A.W. Cross, A.D.R. Phelps, C.G. Whyte, K. Ronald, C.W. Robertson

Research output: Contribution to journalArticle

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Abstract

The first experimental study of a coaxial free-electron maser (FEM) based on two-dimensional (2D) distributed feedback is presented. A new type of cavity formed with coaxial 2D surface photonic band gap structures was used. The FEM was driven by a large diameter (7 cm), high-current(500 A), annular electron beam of energy 475 keV. 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 coaxial FEM generated 15 MW of radiation with a 6% conversion efficiency, in excellent agreement with theory.
LanguageEnglish
Pages035002/1-035002/4
JournalPhysical Review Letters
Volume96
Issue number3
DOIs
Publication statusPublished - 24 Jan 2006

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masers
free electrons
high current
tuning
photonics
electron beams
cavities
radiation
magnetic fields
energy

Keywords

  • co-axial free-electron maser
  • laser
  • co-axial
  • two dimensional feedback
  • 2D Bragg
  • photonic band gap
  • radiation
  • physics

Cite this

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title = "Experimental study of coaxial free-electron maser based on two-dimensional distributed feedback",
abstract = "The first experimental study of a coaxial free-electron maser (FEM) based on two-dimensional (2D) distributed feedback is presented. A new type of cavity formed with coaxial 2D surface photonic band gap structures was used. The FEM was driven by a large diameter (7 cm), high-current(500 A), annular electron beam of energy 475 keV. 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 coaxial FEM generated 15 MW of radiation with a 6{\%} conversion efficiency, in excellent agreement with theory.",
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Experimental study of coaxial free-electron maser based on two-dimensional distributed feedback. / Konoplev, I.V.; McGrane, P.; He, W.; Cross, A.W.; Phelps, A.D.R.; Whyte, C.G.; Ronald, K.; Robertson, C.W.

In: Physical Review Letters, Vol. 96, No. 3, 24.01.2006, p. 035002/1-035002/4.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Experimental study of coaxial free-electron maser based on two-dimensional distributed feedback

AU - Konoplev, I.V.

AU - McGrane, P.

AU - He, W.

AU - Cross, A.W.

AU - Phelps, A.D.R.

AU - Whyte, C.G.

AU - Ronald, K.

AU - Robertson, C.W.

PY - 2006/1/24

Y1 - 2006/1/24

N2 - The first experimental study of a coaxial free-electron maser (FEM) based on two-dimensional (2D) distributed feedback is presented. A new type of cavity formed with coaxial 2D surface photonic band gap structures was used. The FEM was driven by a large diameter (7 cm), high-current(500 A), annular electron beam of energy 475 keV. 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 coaxial FEM generated 15 MW of radiation with a 6% conversion efficiency, in excellent agreement with theory.

AB - The first experimental study of a coaxial free-electron maser (FEM) based on two-dimensional (2D) distributed feedback is presented. A new type of cavity formed with coaxial 2D surface photonic band gap structures was used. The FEM was driven by a large diameter (7 cm), high-current(500 A), annular electron beam of energy 475 keV. 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 coaxial FEM generated 15 MW of radiation with a 6% conversion efficiency, in excellent agreement with theory.

KW - co-axial free-electron maser

KW - laser

KW - co-axial

KW - two dimensional feedback

KW - 2D Bragg

KW - photonic band gap

KW - radiation

KW - physics

UR - http://dx.doi.org/10.1103/PhysRevLett.96.035002

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DO - 10.1103/PhysRevLett.96.035002

M3 - Article

VL - 96

SP - 035002/1-035002/4

JO - Physical Review Letters

T2 - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

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