Theoretical Studies of Two-Dimensional Effects in Free Electron Lasers.
Final technical rept. 1 Feb-31 Oct 84,
AUSTIN RESEARCH ASSOCIATES INC TX
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This report describes the development of a two-dimensional numerical simulation free electron laser code which includes pass-to-pass electromagnetic pulse evolution, wave diffraction, transverse betatron motion of the electrons, and frequency discrimination to suppress the growth of unstable sidebands. The code was used to simulate the experiment recently completed at TRW, the experiment being done at LANL, and the proposed MSNW experiment. The TRW simulations are in qualitative agreement with experimental results. The LANL simulations are similar to the one-dimensional simulations 1-D previously done. The MSNW simulations exhibit general trends which are similar to those of the MSNW 1-D simulations in both, frequency discrimination improves the trapping efficiency and produces a smooth optical pulse. This report also discusses the feasibility of steady state operation of tapered wigglers in storage rings. Long smooth optical pulses are necessary to reduce energy spreading in the wiggler. Conventional tapered wigglers appear to require lower circulating power levels than phase area displacement wigglers. Additional keyword Variable parameter wiggler.
- Lasers and Masers
- Particle Accelerators