Stimulated coherent Smith-Purcell radiation from a metallic grating

A relativistic electron beam with velocity /spl nu//sub b/z passing over a metallic grating, with deep periodic depressions of wavenumber k/sub 0/z, excites a slow wave (/spl omega/, k/sub z/) via Cerenkov interaction, /spl omega/=(k/sub z/+k/sub 0/)/spl nu//sub b/. The beam bunches induce currents...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 1999-10, Vol.35 (10), p.1386-1389
Main Authors: Chuan Sheng Liu, Tripathi, V.K.
Format: Article
Language:English
Subjects:
Arrayed waveguide gratings
Arrays
Beam currents
Beams (radiation)
Cherenkov radiation
Current measurement
Electromagnetic measurements
Electromagnetic waveguides
Electromagnetism
electron and ion optics
Electron beams
Exact sciences and technology
Excitation
Fundamental areas of phenomenology (including applications)
Goniometers
Instability
Periodic structures
Phase measurement
Phased arrays
Physics
Radiation by moving charges
Thresholds
Wavelength measurement
Wavelengths
Wavenumber
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Summary:A relativistic electron beam with velocity /spl nu//sub b/z passing over a metallic grating, with deep periodic depressions of wavenumber k/sub 0/z, excites a slow wave (/spl omega/, k/sub z/) via Cerenkov interaction, /spl omega/=(k/sub z/+k/sub 0/)/spl nu//sub b/. The beam bunches induce currents in the fins of the grating that act as a phased radiating dipole array, thereby generating coherent radiation at a wavelength /spl lambda/=(2/spl pi//k/sub 0/l)(c//spl nu//sub b/-sin/spl theta/) where l is an integer and /spl theta/ is the angle of emission measured from the normal of the grating. The current threshold for the instability and radiation power scaling with beam current are discussed.
ISSN:0018-9197
1558-1713
DOI:10.1109/3.792548