Abstract
The bunching part optimization results of an on-axis-coupled biperiodic accelerating structure for electron linac with high-frequency focusing are presented. System is intended for operation in the continuous regime at operating frequency of 2856 MHz and input power 5.5 MW. The basic development challenge for such installations on average input currents is the effective beam transfer through the structure. Some variants of the bunching sections distinguished by number of bunching cells were considered. The optimum capture ratio and an acceptable spectrum are provided by structure with five bunching cells. Optimization was carried out by means of dynamics simulation code PARMELA and a package of applied programs for the axial symmetric structures calculation SUPERFISH. Taking into account, space-charge limitation, the maximum capture ratio is 55%.
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