Speaker
Description
A re-entrant cavity beam position monitor (cBPM) has been designed using CST Studio Suite electromagnetic simulations to provide high-resolution spatial measurements for future colliders. This model, operating at 1.630 GHz, offers improved theoretical performance compared to previous prototypes by increasing the normalized shunt impedance (R/Q) and the loaded quality factor (Q_L), which enhance sensitivity and signal duration, respectively. The design incorporates commercial feedthroughs and achieves low coupling between orthogonal ports, minimizing cross-talk. The prototype was manufactured with a tolerance of 50 um, and its radio-frequency (RF) parameters were characterized to evaluate performance prior to beam tests.
A dedicated readout system, featuring an analog down-conversion stage followed by a digital down-conversion (DDC) algorithm, was developed and tuned to the cBPM operating frequency to reconstruct beam position via a calibration procedure. The broadband nature of the signals allows the filtering of the monopole mode at the dipole frequency, enabling the extraction of X, Y and reference signals from a single BPM. The complete system (cBPM and readout chain) was installed at the Accelerator Test Facility (ATF) end of the Linac. This setup underwent full characterization to evaluate dynamic range, linearity, and spatial resolution. Finally, theoretical performance predictions are compared with preliminary experimental results.
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| Supervisor's name | Daniel Esperante, Nuria Fuster |
| Supervisor's email | daniel.esperante@ific.uv.es, nuria.fuster@ific.uv.es |
| Paper submission software | LATeX |