Speaker
Description
Accurate, non-invasive charge measurement is essential for high-precision beam experiments, especially at low bunch charge and low repetition rate. Interceptive devices such as Faraday cups and microchannel-plate detectors can suffer charge loss, which is a critical concern for low charge beams. This work presents a simulation-based feasibility study of a compact, material loaded re-entrant cavity Bunch Charge Monitor (BCM) for non-relativistic antimatter beams. Three-dimensional electromagnetic simulations were used to evaluate the cavity response and key RF parameters relevant to single-shot charge measurement in the few-pC range. As an initial check, a cavity tuned for nanosecond-scale pulses was simulated, offering a reference for other bunch durations. Preliminary findings indicate that dielectric loading can reduce cavity size while maintaining suitable RF performance. Limitations and next steps are outlined, with attention to coupling and signal extraction. The concept is motivated by low-energy antiproton studies like AEgIS at CERN and, with appropriate tuning, may also be adapted to plasma accelerator environments such as EuPRAXIA with low bunch repetition rates.
