7–11 Sept 2025
Teaching Hub 502
Europe/London timezone

FIRST MEASUREMENTS OF A PROTOTYPE STRIPLINE BPM FOR PETRA IV. COMPARISON WITH SIMULATION

WEPCO26
10 Sept 2025, 16:00
2h
Courtyard, Liverpool Guild of Students

Courtyard, Liverpool Guild of Students

Liverpool Guild of Students, University of Liverpool
Poster Presentation MC03: Beam Position Monitors WEPCO

Speaker

Gero Kube (Deutsches Elektronen-Synchrotron DESY)

Description

We present signal and thermal measurements from the first prototype of a stripline Beam Position Monitor (BPM) intended for the PETRA IV synchrotron ring [1]. The monitor was installed at the PETRA III testbed for evaluation and compared against CST Studio Suite [2] simulation results. Initial measurements revealed unexpected signal oscillations and significant heating (up to 135 °C), which were not reproduced in ideal models. For a smooth beam pipe, the expected power loss based on the wake-loss factor would only be 5 W. Including mechanical details such as flanges and copper gaskets in the simulation revealed cavity-induced resonances, which increased the power loss up to 96 W. The updated model showed good agreement with the measured signals in both time (TD) and frequency domains (FD) as well as with thermal data. Replacing the gasket with a RF-sealing variant lowered the measured temperature to 65 °C. This study highlights that multiple mechanical and electromagnetic factors must be understood and included in simulations to predict beam-induced effects in high-frequency diagnostics accurately.

Funding Agency

The PETRA IV project team acknowledges funding of the preparation phase granted by the Bundesministerium für Bildung und Forschung (BMBF) under the contract VPETRAIV.

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Author

Sergey Strokov (Deutsches Elektronen-Synchrotron DESY)

Co-authors

Dirk Lipka (Deutsches Elektronen-Synchrotron DESY) Gero Kube (Deutsches Elektronen-Synchrotron DESY) Martin Lantschner (Deutsches Elektronen-Synchrotron DESY)

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