Abstract
Accelerating structures with damped higher-order modes (HOMs) have been the focus of many studies over the past decade. This report compares the results of numerical simulations of damping of HOMs using a new calculation technique applied to the case of the PEP-II rf cavity. We compare these results using this technique, which was not yet developed at the time of the original design, with bench and beam-based measurements of the HOM damping. These results show agreement with bench measurements of the shunt impedances of the strongest HOMs as well as measurements of the beam-induced signals on cavities installed in PEP-II.
Highlights
An rf cavity free of higher-order modes (HOMs) has long been a desire of accelerator builders
The PEP-II rf cavity is from a recent generation of cavity designs with strong damping of the HOMs in operation [1,2]
The second is to compare the simulated performance of the PEP-II cavity using this technique with the measured performance in the laboratory and installed in PEP-II with beam
Summary
An rf cavity free of higher-order modes (HOMs) has long been a desire of accelerator builders. At the time of the original PEP-II cavity design, the techniques available for computing the quality factors (Q’s) of HOMs in highly damped structures required large computing times, essentially limiting the analysis to only a few HOMs. Full characterization of the HOMs required construction of a cold-test model of the cavity. The first is to describe a time domain simulation technique for computing the HOM damping of highly damped structures using the PEP-II cavity as a model. The second is to compare the simulated performance of the PEP-II cavity using this technique with the measured performance in the laboratory and installed in PEP-II with beam.
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