ICAP 2002 Abstracts and Posters
Numerical Studies of Field Gradients and Dark Currents in SLAC Structures
Abstract
Considerable efforts, both theoretically and experimentally, have been devoted to the development of high gradient accelerating structures for next-generation high energy linear colliders. However, RF breakdown and dark current capture remain the two limiting factors that prevent structures from reaching their designed accelerating gradients. We present numerical calculations aimed at providing insights into these mechanisms by modeling SLAC structures that have been used in high power tests so that benchmarks between measurements and simulation results could be made. The simulations include studies of the peak fields in the structure as a function of pulse rise time, and of the trajectories of emitted particles, both primary and secondary, that result in such field configurations. We use the parallel, time-domain, unstructured-grid code, Tau3P, and the particle tracking module, Ptrack3D, in these numerical experiments.
L. Ge, A. Guetz, V. Ivanov, Z. Li, C. Ng, G. Schussmann, Y. Sun, M. Weiner, M.Wolf, K. Ko
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