FEL Amplifier Performance In The Compton Regime

Ralph A. Cover; Anup Bhowmik

doi:10.1117/12.947101

16 February 1984 FEL Amplifier Performance In The Compton Regime

Ralph A. Cover, Anup Bhowmik

Proceedings Volume 0453, Free-Electron Generators of Coherent Radiation; (1984) https://doi.org/10.1117/12.947101
Event: Free-Electron Generators of Coherent Radiation, 1983, Orcas Island, United States

Abstract

The Kroll-Morton-Rosenbluth equations of motion for electrons in a linearly polarized, tapered wiggler are utilized to describe gain in free-electron laser amplifiers. The three-dimensional amplifier model includes the effects of density variation in the electron beam, off-axis variations in the wiggler magnetic field, and betatron oscillations. The input electromagnetic field is injected and subsequently propagated within the wiggler by computing the Fresnel-Kirchhoff diffraction integral using the Gardner-Fresnel-Kirchhoff algorithm. The injected optical beam used in evaluating amplifier performance is initially a Gaussian which in general may be astigmatic. The importance of the above effects on extraction effi-ciency is computed both with rigorous three-dimensional electromagnetic wave propagation and a Gaussian treatment of the field.

Citation Download Citation

Ralph A. Cover and Anup Bhowmik "FEL Amplifier Performance In The Compton Regime", Proc. SPIE 0453, Free-Electron Generators of Coherent Radiation, (16 February 1984); https://doi.org/10.1117/12.947101

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