Experimental and theoretical study of 2D Bragg structures for a coaxial free electron maser

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

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Abstract

Experimental results are presented of the first observation of two-dimensional distributed feedback in a coaxial 2D-Bragg structure. The use of two-dimensional distributed feedback has been proposed as a method of producing spatially coherent radiation from extremely powerful large sized relativistic electron beams. To obtain coherent high-power (GW) microwave and millimetre wave radiation, 2D Bragg resonators are needed to overcome the problems of mode selection and synchronisation of radiation from different parts of an oversized beam. The design and cold microwave measurements of a 2D Bragg coaxial structure for use in a Free Electron Maser (FEM) driven by an annular electron beam of circumference 25 times larger than the radiation wavelength is presented. The cavity for the 2D Bragg FEM consists of two 2D Bragg coaxial reflectors separated by a regular coaxial waveguide. The formation of pure two-dimensional distributed feedback without a mixture of one-dimensional parasitic feedback was demonstrated for the first time in this series of experiments. The first experimental comparison of 2D and ID Bragg structures was also conducted and good agreement between experimental results and theoretical predictions was observed. The eigenmodes of the two-mirror cavity were calculated and it was shown that a single-mode steady-state operation regime could be obtained in a FEM based on such a novel cavity. 

LanguageEnglish
Pages164-172
Number of pages9
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume475
Issue number1-3
DOIs
Publication statusPublished - 21 Dec 2001

Fingerprint

Masers
masers
free electrons
Feedback
Radiation
Electrons
cavities
Electron beams
Microwave measurement
microwaves
coherent radiation
relativistic electron beams
circumferences
radiation
Millimeter waves
millimeter waves
reflectors
Resonators
synchronism
electromagnetic radiation

Keywords

  • free-electron laser and maser
  • distributed feedback
  • Bragg structure
  • high-power microwaves
  • mode competition
  • millimetre wave devices
  • FEL
  • oscillator
  • microwave devices
  • free electron masers
  • 2D Bragg

Cite this

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title = "Experimental and theoretical study of 2D Bragg structures for a coaxial free electron maser",
abstract = "Experimental results are presented of the first observation of two-dimensional distributed feedback in a coaxial 2D-Bragg structure. The use of two-dimensional distributed feedback has been proposed as a method of producing spatially coherent radiation from extremely powerful large sized relativistic electron beams. To obtain coherent high-power (GW) microwave and millimetre wave radiation, 2D Bragg resonators are needed to overcome the problems of mode selection and synchronisation of radiation from different parts of an oversized beam. The design and cold microwave measurements of a 2D Bragg coaxial structure for use in a Free Electron Maser (FEM) driven by an annular electron beam of circumference 25 times larger than the radiation wavelength is presented. The cavity for the 2D Bragg FEM consists of two 2D Bragg coaxial reflectors separated by a regular coaxial waveguide. The formation of pure two-dimensional distributed feedback without a mixture of one-dimensional parasitic feedback was demonstrated for the first time in this series of experiments. The first experimental comparison of 2D and ID Bragg structures was also conducted and good agreement between experimental results and theoretical predictions was observed. The eigenmodes of the two-mirror cavity were calculated and it was shown that a single-mode steady-state operation regime could be obtained in a FEM based on such a novel cavity. ",
keywords = "free-electron laser and maser, distributed feedback, Bragg structure, high-power microwaves, mode competition, millimetre wave devices, FEL , oscillator, microwave devices, free electron masers, 2D Bragg",
author = "Cross, {A W} and W He and Konoplev, {I V} and Phelps, {A D R} and K Ronald and Robb, {G R M} and Whyte, {C G} and Ginzburg, {N S} and Peskov, {N Y} and Sergeev, {A S}",
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TY - JOUR

T1 - Experimental and theoretical study of 2D Bragg structures for a coaxial free electron maser

AU - Cross, A W

AU - He, W

AU - Konoplev, I V

AU - Phelps, A D R

AU - Ronald, K

AU - Robb, G R M

AU - Whyte, C G

AU - Ginzburg, N S

AU - Peskov, N Y

AU - Sergeev, A S

PY - 2001/12/21

Y1 - 2001/12/21

N2 - Experimental results are presented of the first observation of two-dimensional distributed feedback in a coaxial 2D-Bragg structure. The use of two-dimensional distributed feedback has been proposed as a method of producing spatially coherent radiation from extremely powerful large sized relativistic electron beams. To obtain coherent high-power (GW) microwave and millimetre wave radiation, 2D Bragg resonators are needed to overcome the problems of mode selection and synchronisation of radiation from different parts of an oversized beam. The design and cold microwave measurements of a 2D Bragg coaxial structure for use in a Free Electron Maser (FEM) driven by an annular electron beam of circumference 25 times larger than the radiation wavelength is presented. The cavity for the 2D Bragg FEM consists of two 2D Bragg coaxial reflectors separated by a regular coaxial waveguide. The formation of pure two-dimensional distributed feedback without a mixture of one-dimensional parasitic feedback was demonstrated for the first time in this series of experiments. The first experimental comparison of 2D and ID Bragg structures was also conducted and good agreement between experimental results and theoretical predictions was observed. The eigenmodes of the two-mirror cavity were calculated and it was shown that a single-mode steady-state operation regime could be obtained in a FEM based on such a novel cavity. 

AB - Experimental results are presented of the first observation of two-dimensional distributed feedback in a coaxial 2D-Bragg structure. The use of two-dimensional distributed feedback has been proposed as a method of producing spatially coherent radiation from extremely powerful large sized relativistic electron beams. To obtain coherent high-power (GW) microwave and millimetre wave radiation, 2D Bragg resonators are needed to overcome the problems of mode selection and synchronisation of radiation from different parts of an oversized beam. The design and cold microwave measurements of a 2D Bragg coaxial structure for use in a Free Electron Maser (FEM) driven by an annular electron beam of circumference 25 times larger than the radiation wavelength is presented. The cavity for the 2D Bragg FEM consists of two 2D Bragg coaxial reflectors separated by a regular coaxial waveguide. The formation of pure two-dimensional distributed feedback without a mixture of one-dimensional parasitic feedback was demonstrated for the first time in this series of experiments. The first experimental comparison of 2D and ID Bragg structures was also conducted and good agreement between experimental results and theoretical predictions was observed. The eigenmodes of the two-mirror cavity were calculated and it was shown that a single-mode steady-state operation regime could be obtained in a FEM based on such a novel cavity. 

KW - free-electron laser and maser

KW - distributed feedback

KW - Bragg structure

KW - high-power microwaves

KW - mode competition

KW - millimetre wave devices

KW - FEL

KW - oscillator

KW - microwave devices

KW - free electron masers

KW - 2D Bragg

U2 - 10.1016/S0168-9002(01)01577-7

DO - 10.1016/S0168-9002(01)01577-7

M3 - Article

VL - 475

SP - 164

EP - 172

JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

T2 - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

SN - 0168-9002

IS - 1-3

ER -