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Simulation of Dark Currents in X-band Accelerator Structures ∗

By K. L. F. Bane, V. A. Dolgashev and G. V. Stupakov

Abstract

In high gradient accelerator structures, such as are used in the main linac of the Next Linear Collider (NLC) [1], 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. [2]). In this report we use the dark current program—a Mathematica program written by S. Setzer [3]—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. [3]–[6]). A difference from earlier numerical work is that, instead of choosin

Year: 2004
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