Dresden 2026 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 3: Diagnostics

AKBP 3.1: Talk

Monday, March 9, 2026, 15:00–15:15, SCH/A117

Broadband Cavity BPM Design for MESA — •Robin Wolf — Institut für Kernphysik, Mainz, Germany

The MESA accelerator's Energy Recovery Linac (ERL) mode requires a fast and sensitive beam position monitor (BPM) capable of distinguishing between accelerated and decelerated electron bunches in diagnostic pulse mode. This talk will present the design of the proposed cavity BPM for the MESA requirements.

The proposed design is an adaptation of the SACLA BPM, optimised for operation at 2.6GHz (the 2nd harmonic of MESA's 1.3GHz RF frequency) for increased sensitivity and smaller physical size. The tailored cavity design integrates a monopole-mode cavity (for phase and intensity measurements) with an dipole-mode cavity (for position measurements). Key enhancements include the splitting of the X and Y planes with implementation of mode separators, which maximises orthogonal plane decoupling. Furthermore, integrated waveguides are employed in the dipole-part to suppress the monopole-mode, while offering increased freedom in antenna coupling to the dipole field.

Keywords: beam position monitor; bpm design; broadband bpm; cavity design