Abstract
A self-consistent analysis of wiggler-field errors in free-electron lasers is described using the three-dimensional simulation code wigglin. A random variation is chosen for the pole-to-pole wiggler amplitude, and a continuous map is used between the pole faces. On average, increases in the root-mean-square value of the field causes a decrease in the interaction efficiency; however, this is relatively benign for the specific case studied, and particular error distributions can result in efficiency enhancements.
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