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Proceedings Paper

Modeling Of Induction-Linac Based Free-Electron Laser Amplifiers
Author(s): R. A. Jong; W. M. Fawley; E. T. Scharlemann
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Paper Abstract

We describe the modeling of an induction-linac based free-electron laser (IFEL) amplifier for producing multi-megawatt levels of microwave power. We have used the Lawrence Livermore National Laboratory (LLNL) free-electron laser simulation code, FRED, and the simulation code for sideband calculations, GINGER for this study. For IFEL amplifiers in the frequency range of interest (200 to 600 GHz), we have devised a wiggler design strategy which incorporates a tapering algorithm that is suitable for free-electron laser (FEL) systems with moderate space-charge effects and that minimizes spontaneous noise growth at frequencies below the fundamental, while enhancing the growth of the signal at the fundamental. In addition, engineering design considerations of the waveguide wall loading and electron beam fill factor in the waveguide set limits on the waveguide dimensions, the wiggler magnet gap spacing, the wiggler period, and the minimum magnetic field strength in the tapered region of the wiggler. As an example, we shall describe an FEL amplifier designed to produce an average power of about 10 MW at a frequency of 280 GHz to be used for electron cyclotron resonance heating of tokamak fusion devices.

Paper Details

Date Published: 31 May 1989
PDF: 10 pages
Proc. SPIE 1045, Modeling and Simulation of Laser Systems, (31 May 1989); doi: 10.1117/12.951306
Show Author Affiliations
R. A. Jong, University of California (United States)
W. M. Fawley, University of California (United States)
E. T. Scharlemann, University of California (United States)


Published in SPIE Proceedings Vol. 1045:
Modeling and Simulation of Laser Systems
Donald L. Bullock, Editor(s)

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