Resonator performance analysis for a ring resonator FEL

Siva A. Mani; Jerry E. Long; Louis Scott Hills

doi:10.1117/12.18462

1 June 1990 Resonator performance analysis for a ring resonator FEL

Siva A. Mani, Jerry E. Long, Louis Scott Hills

Proceedings Volume 1224, Optical Resonators; (1990) https://doi.org/10.1117/12.18462
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

The RF Linear Accelerator Free Electron Laser is usually operated in the oscillator mode. For high power operation, a ring resonator configuration with grazing angle incidence optics is the preferred choice. In this paper, we describe the modeling of such an oscillator configuration using full wave optics. The steady state mode structure of the resonator is obtained using Fox-Li type of calculation. We start with a gaussian field and propagate this field through the wiggler and the optical components of the resonator. The field at the end of one iteration through the resonator is compared with the field at the start of the iteration. This process is repeated until the field shape and the cavity power levels reach steady state reproducibility to within a couple of percent. The FEL interaction is modeled by tracking the motion of thousands of electrons through the wiggler and averaging their energy loss. Betatron motion of the electrons is taken into account as are any field and misalignment errors in the fabrication of the wiggler. We have used this numerical model to investigate the effects of (i) misalignment of mirrors, (ii) aberration of the mirrors, (iii) the efficacy of compensatory misalignment techniques, and (iv) the dependence of the performance of the FEL on the outcoupling fraction.

Citation Download Citation

Siva A. Mani, Jerry E. Long, and Louis Scott Hills "Resonator performance analysis for a ring resonator FEL", Proc. SPIE 1224, Optical Resonators, (1 June 1990); https://doi.org/10.1117/12.18462

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KEYWORDS

Resonators

Mirrors

Free electron lasers

Monochromatic aberrations

Optical resonators

Electrons

Optics manufacturing

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