High Precision RF Measurement for ESS Cavity Parameters

University essay from Lunds universitet/Institutionen för elektro- och informationsteknik

Abstract: In this thesis an investigation of how inaccuracies in measurements affects the field in the cavities used in the accelerator of the European Spallation Source (ESS). New ways to calculate the dynamic detuning and the quality factor of the cavities will also be investigated. This is done by setting up a simulation model in Simulink where the cavities are described by a differential equation. This model includes both the new and old analysis methods. It is found that different inaccuracies have very different effects on the cavity. Inaccuracies in quality factor and R/Q value affect the cavity control the most. The new calculation method for the dynamic detuning is found to be better since it can show the dynamic detuning both during and after the RF pulse and it is less dependent on inaccuracies. For QL the old measurement method is better since inaccuracies have less impact on it than on the new measurement method.

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