Nonlinear Wave Propagation in Free Electron Lasers.
Final scientific rept. 1 Jul 85-31 Dec 86,
BERKELEY RESEARCH ASSOCIATES INC CA
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An outline of new research results is given in the FEL klystron theory, exotic short-pulse evolution, optical guiding in the high-gain regime, fully four-dimensional simulations of the FEL, coherence development and line-narrowing in the FEL, and a global map describing the trapped-particle instability and chaos regions in the free electron laser. The description of the high-gain klystron FEL was improved. Previous work has assumed low-gain in the analysis of the high-gain klystron design. The gain of the klystron FEL in this research was calculated with use of the coupled, self-consistent Lorentz-Maxwell equations. For high gain, the objective of the klystron configuration, the gain spectrum is found to be modified from the previously known low-gain result. This is caused by the shifting of the optical phase during the gain process and is calculated for the first time. The effects derived are not obtainable from the Madey Theorem. The klystron saturation in strong nonlinear optical fields is also discussed. A comparison is made of the use of plasma theory and distribution functions, and the single particle approach.
- Lasers and Masers
- Electrical and Electronic Equipment