Abstract
Optical guiding in the linear growth regime of an FEL amplifier has been reported in simulations by Scharlemann et al., using the LLNL 2D code FRED. We present the results of a parameter space investigation of optical guiding in an FEL using the FRED code with a realistic range of input parameters: optical wavelength, mode size and focus, current density, emittance, and wiggler period. We find that optical guiding has a profound impact on gain, and that within existing mirror technology and for the operating characteristics expected of the Stanford storage ring FEL now in construction, oscillation is achievable from the visible through 300 Å. We also describe the relative importance of guiding in different regimes. In support of these predictions we present “FRED” benchmarking results.
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