Journal ArticleDOI
Experimental and theoretical study of 2D Bragg structures for a coaxial free electron maser
Adrian W. Cross,Wenlong He,Ivan Konoplev,Alan D. R. Phelps,Kevin Ronald,Gordon R. M. Robb,Colin G. Whyte,Naum S. Ginzburg,N. Yu. Peskov,A. S. Sergeev +9 more
TLDR
In this article, a 2D-Bragg structure for a Free Electron Maser (FEM) driven by an annular electron beam of circumference 25 times larger than the radiation wavelength is presented.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 1D 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.read more
Citations
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Journal ArticleDOI
The use of a hybrid resonator consisting of one-dimensional and two-dimensional Bragg reflectors for generation of spatially coherent radiation in a coaxial free-electron laser
Naum S. Ginzburg,N. Yu. Peskov,A. S. Sergeev,Alan D. R. Phelps,Adrian W. Cross,Ivan Konoplev +5 more
TL;DR: In this paper, a hybrid scheme of a two-mirror Bragg resonator consisting of one-dimensional and two-dimensional reflectors is proposed for generation of powerful spatially coherent radiation in a coaxial free-electron laser driven by a large-size (102-103 wavelengths) high-current annular relativistic electron beam.
Journal ArticleDOI
Studies of surface two-dimensional photonic band-gap structures
TL;DR: In this article, the results of theoretical and experimental studies of 2D surface photonic band-gap structures are compared with theoretical results and good agreement between theory and experiment is demonstrated.
Journal ArticleDOI
A Coaxial Bragg Reflector for Cyclotron Autoresonance Maser Oscillators
TL;DR: In this article, a coaxial Bragg reflector is proposed for the application in the cyclotron autoresonance masers (CARMs), where both the outer wall and inner rod are corrugated with weak axisymmetric-sinusoidal-ripple, and a concept design is presented.
Journal ArticleDOI
Spontaneous and induced parametric and Smith–Purcell radiation from electrons moving in a photonic crystal built from the metallic threads
TL;DR: In this article, the electrodynamical properties of a crystal-like artificial periodic structure (a photonic crystal) formed by a periodic structure built from the metallic threads (grid volume resonator) are considered.
Journal ArticleDOI
Excitation of surface field cavity and coherence of electromagnetic field scattering on two-dimensional cylindrical lattice
TL;DR: In this paper, the excitation of a surface field cavity based on a large area two-dimensional cylindrical lattice and surface field scattering within the cavity was investigated. And the coherence of the radiation observed from the surface-field scattering was investigated and it was shown that the interaction between surface and volume fields via distributed scatterers becomes coherent and the cavity excitation takes place only when it is irradiated with a near cut-off transverse-magnetic polarized field.
References
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Journal ArticleDOI
High-efficiency single-mode free-electron maser oscillator based on a bragg resonator with step of phase of corrugation
Naum S. Ginzburg,A.A. Kaminsky,Alim K. Kaminsky,N. Yu. Peskov,S.N. Sedykh,A. P. Sergeev,A. S. Sergeev +6 more
TL;DR: A new type of high-selective Bragg resonator having a step of corrugation inside the interaction region was used as a microwave system for a free-electron maser (FEM) to achieve a record efficiency of 35% for a millimeter wavelength FEM.
Journal ArticleDOI
Theory and design of a free-electron maser with two-dimensional feedback driven by a sheet electron beam
Naum S. Ginzburg,N.Y. Peskov,A. S. Sergeev,Alan D. R. Phelps,Ivan Konoplev,Gordon R. M. Robb,Adrian W. Cross,Andrey V. Arzhannikov,Stanislav L. Sinitsky +8 more
TL;DR: A time-domain analysis of the excitation of an open 2D Bragg resonator by asheet electron beam demonstrates that a single-mode steady-state oscillation regime may be obtained for a sheet electron beam of width 100-1000 wavelengths.
Journal ArticleDOI
Mode competition and control in free-electron-laser oscillators.
Thomas M. Antonsen,Baruch Levush +1 more
TL;DR: The problem of longitudinal mode competition in free-electron lasers is addressed and it is shown that for small enough ratios of the current to output coupling coefficient many single-mode states are possible.
Journal ArticleDOI
Single-mode operation of a Bragg free-electron maser oscillator.
TL;DR: Results indicate that a Raman free-electron maser can operate at high power and efficiency with stable single-mode output in the long pulse (equilibrium) regime.