Abstract
There have been extensive studies on the effects of intrinsic field errors on the operation and performance of free-electron lasers (FEL’s) based predominantly on simple models for the spatial form and statistical properties of the field errors. In some cases, the effects of compensation magnets or steering coils have been included as a method of reducing the deleterious effects of field errors. In the present study the effects of (i) compensation magnets, (ii) general spatial forms that are more realistic models of experimental wigglers, and (iii) statistical correlations of the field errors are considered. This theoretical study has resulted in a quantitative means of measuring the relative merit of these experimental techniques for reducing wiggler field error effects. These means of comparative analysis yield important criteria for experimental design and modeling.
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