Speaker
Description
We present voltage and thermal measurements from the first prototype of a stripline BPM intended for the PETRA IV synchrotron ring. The monitor was installed at the PETRA III testbed for evaluation and compared with CST Microwave Studio simulation results. Initial measurements revealed unexpected voltage oscillations and significant heating (~135 °C) which were not reproduced in idealized models. For a smooth beam pipe, the expected highest power loss based on the wake-loss factor would only be 1.8 W. Including mechanical details such as flanges and gaskets in the simulation revealed cavity-induced resonances that increased the power loss to 96 W. The updated model showed good agreement with the measured voltages in both time and frequency domains as well as with thermal data. Replacing the gasket with a smaller inner diameter reduced the power loss to 27 W and lowered the measured temperature to ~92 °C. This study highlights that multiple mechanical and electromagnetic factors must be understood and included in simulations to accurately predict beam-induced effects in high-frequency diagnostics.
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