In high gradient accelerator structures, such as are used in the main linac of the Next Linear Collider (NLC) , electrons are emitted spontaneously from structure walls and then move under the influence of rf fields. A question of interest for the NLC is, what is the effect of such “dark current ” electrons on the main linac bunch, e.g. can they significantly affect its orbit or emittance? To help answer this question we have taken a dark current simulation program and modified it to estimate such effects (see Ref. ). In this report we use the dark current program—a Mathematica program written by S. Setzer —to study properties of dark currents themselves. Dark currents have been studied by many authors, both experimentally and through numerical tracking (see e.g. Refs. –). A difference from earlier numerical work is that, instead of choosin
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