Multidimensional simulation studies of the SELENE FEL oscillator/buncher followed by a radiator/amplifier output scheme Page: 4 of 12
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CBP NOTE # 141
Multidimensional simulation studies of the SELENE FEL
oscillator/buncher followed by a radiator/amplifier
S. J. Hahnt
Stanford Linear Accelerator Center, Stanford University
Stanford, CA 94309
W. M. Fawley
Lawrence Berkeley Laboratory, University of California,
Berkeley, CA 94720
We analyze and present numerical simulations of the so-called electron output scheme [G. I. Erg et al, 15th
Int. FEL Conf., The Hague, The Netherlands, 1993, Book of Abstracts p. 50; Preprint Budker INP 93-75] applied
to the SELENE proposal of using a high power FEL to illuminate satellite solar cells. In this scheme, a first
stage FEL oscillator bunches the electron beam while a second stage "radiator" extracts high power radiation.
Our analysis suggests only in the case where the radiator employs a long, tapered undulator will the electron
output scheme produce a significant increase in extraction efficiency over what is obtainable from a simple, single-
stage oscillator. 1- and 2-D numerical simulations of a 1.7pm FEL employing the electron output scheme show
reasonably large bunching fractions (- 0.3 - 0.4) at the output of the oscillator stage but only < 2% extraction
efficiency from the radiator stage.
Keywords: free-electron lasers, oscillators, amplifiers, tapered wigglers, multi-stage devices, power beaming
Bennet et al.' have recently proposed that a high power (> 1 MW average power), ground-based Free Electron
Laser (FEL) might be used to illuminate solar cells of orbiting satellites, providing a much larger electrical power
capability than would be true from normal solar illumination only. In particular, the "electron output" scheme
has been suggested as being particularly attractive for this application. In this scheme, a relatively low power
oscillator in an optical klystron configuration is used to bunch the electron beam which is then transported
*This version of the paper has been revised slightly from that appearing in the proceedings of SPIE Photonics West '95 Conference.
tPermanent address: Dept. of Physics, Chung-Ang University, Seoul 156-756, Korea
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Hahn, S.J. & Fawley, W.M. Multidimensional simulation studies of the SELENE FEL oscillator/buncher followed by a radiator/amplifier output scheme, article, February 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc720615/m1/4/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.