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Merits of a sub-harmonic approach to a single-pass, 1.5-{Angstrom} FEL [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1995.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
3 pages : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
SLAC/SSRL and collaborators elsewhere are studying th physics of a single-pass, FEL amplifier operating in th 1 -- 2 Å, wavelength region based on electron beams from the SLAC linac at ∼ 15 GeV energy. Hoping to reduce the total wiggler length needed to reach saturation when starting from shot noise, we have examined the benefits of making the first part of the wiggler resonant at a subharmonic wavelength (e.g. 4.5 Å) at which the gain length can be significantly shorter. This leads to bunching of the electron beam at both the subharmonic and fundaments wavelengths, thus providing a strong coherent ``seed`` for exponential growth of radiation at the fundamental in the second part of the wiggler. Using both multi-harmonic and multi-frequency 2D FEL simulation codes, we have examined the predicted performance of such devices and the sensitivity to electron beam parameters such as current, emittance, and instantaneous energy spread.
Report Numbers
E 1.99:lbl--36496
E 1.99: conf-950512--303
conf-950512--303
lbl--36496
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
03/01/1995.
"lbl--36496"
" conf-950512--303"
"DE95016454"
16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995.
Scharlemann, E.T.; Fawley, W.M.; Nuhn, H.D.; Bonifacio, R.
Funding Information
AC03-76SF00098
View MARC record | catkey: 14110222