Observation of THz evanescent waves in a Smith-Purcell free-electron laser

Observation of THz evanescent waves in a Smith-Purcell free-electron laser

We present experimental observations of evanescent waves in a Smith-Purcell free-electron laser (FEL). These waves, predicted by both theory and simulations, have wavelengths longer than the Smith-Purcell radiation, group velocity antiparallel to the electron beam, and for sufficiently high current,...

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Main Authors: H. L. Andrews, C. A. Brau, J. D. Jarvis, C. F. Guertin, A. O’Donnell, B. Durant, T. H. Lowell, M. R. Mross
Format: Article
Language:English
Published: American Physical Society 2009-08-01
Series:Physical Review Special Topics. Accelerators and Beams
Online Access:http://doi.org/10.1103/PhysRevSTAB.12.080703
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spelling doaj-6495a576335c421e9df37bd6ba5f08202020-11-25T02:46:35ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022009-08-0112808070310.1103/PhysRevSTAB.12.080703Observation of THz evanescent waves in a Smith-Purcell free-electron laserH. L. AndrewsC. A. BrauJ. D. JarvisC. F. GuertinA. O’DonnellB. DurantT. H. LowellM. R. MrossWe present experimental observations of evanescent waves in a Smith-Purcell free-electron laser (FEL). These waves, predicted by both theory and simulations, have wavelengths longer than the Smith-Purcell radiation, group velocity antiparallel to the electron beam, and for sufficiently high current, provide feedback to bunch the electron beam. This feedback is the basis of oscillator operation of the Smith-Purcell FEL. The wavelengths observed agree with theoretical predictions, and strong radiation from the upstream end of the grating confirms the negative group velocity. Radiation observed at the second harmonic may indicate electron bunching by the evanescent wave.http://doi.org/10.1103/PhysRevSTAB.12.080703
collection DOAJ
language English
format Article
sources DOAJ
author H. L. Andrews
C. A. Brau
J. D. Jarvis
C. F. Guertin
A. O’Donnell
B. Durant
T. H. Lowell
M. R. Mross
spellingShingle H. L. Andrews
C. A. Brau
J. D. Jarvis
C. F. Guertin
A. O’Donnell
B. Durant
T. H. Lowell
M. R. Mross
Observation of THz evanescent waves in a Smith-Purcell free-electron laser
Physical Review Special Topics. Accelerators and Beams
author_facet H. L. Andrews
C. A. Brau
J. D. Jarvis
C. F. Guertin
A. O’Donnell
B. Durant
T. H. Lowell
M. R. Mross
author_sort H. L. Andrews
title Observation of THz evanescent waves in a Smith-Purcell free-electron laser
title_short Observation of THz evanescent waves in a Smith-Purcell free-electron laser
title_full Observation of THz evanescent waves in a Smith-Purcell free-electron laser
title_fullStr Observation of THz evanescent waves in a Smith-Purcell free-electron laser
title_full_unstemmed Observation of THz evanescent waves in a Smith-Purcell free-electron laser
title_sort observation of thz evanescent waves in a smith-purcell free-electron laser
publisher American Physical Society
series Physical Review Special Topics. Accelerators and Beams
issn 1098-4402
publishDate 2009-08-01
description We present experimental observations of evanescent waves in a Smith-Purcell free-electron laser (FEL). These waves, predicted by both theory and simulations, have wavelengths longer than the Smith-Purcell radiation, group velocity antiparallel to the electron beam, and for sufficiently high current, provide feedback to bunch the electron beam. This feedback is the basis of oscillator operation of the Smith-Purcell FEL. The wavelengths observed agree with theoretical predictions, and strong radiation from the upstream end of the grating confirms the negative group velocity. Radiation observed at the second harmonic may indicate electron bunching by the evanescent wave.
url http://doi.org/10.1103/PhysRevSTAB.12.080703
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