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XX International Linac Conference

TUE02 (Poster)

Presenter: Chris Adolphsen (SLAC)
Status: NoShow - No full text

Simulation of RF breakdown in X-Band Accelerator Structures and Its Implications for the Design of High Gradient Structures*


The linacs of the NLC will contain several thousand X-Band accelerator structures operating at an unloaded gradient of 72 MV/m. A major concern is the damage that can occur in these structures from rf breakdown. Experimentally, pitting has been observed on the surfaces of the cell irises in prototype structures that have been processed to high gradients. To better understand this damage, one would like to model the structure operation during rf breakdown. However, this very difficult to do at a microscopic level. Instead, we have modeled the macroscopic characteristics of breakdown, in particular, we use an equivalent circuit of the structure where a time dependent cell Q is introduced to match the general characteristics of the observed forward and reflected rf pulses during breakdown. In this paper, we describe these results and discuss their implications for designing high gradient structures.
* Work supported by Department of Energy contract DE-AC03-76SF00515

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