Benchmarking the Use of BPM Quadrupole Moments to Measure Emittance

2025/11/25 by Balcewicz, M. A., Tan, C. Y.
Engineering · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #Particle Accelerators and Free-Electron Lasers #Particle accelerators and beam dynamics #Superconducting Materials and Applications

paper · doi:10.48550/arxiv.2511.20444

openalex publication_date 2025/11/25 · openalex created_date 2025/11/28 · openalex updated_date 2026/07/28

Abstract

For the PIP-II program, transverse emittance in the Fermilab Booster must remain well controlled at higher bunch intensities. 4-plate beam position monitors (BPMs) have a small but measurable quadrupole moment, making it possible to infer transverse emittance. By compositing many BPMs together, it becomes possible to improve the quality of the quadrupole signal. The Fermilab Booster BPM system has been used to measure these quadrupole moments in the past year and derive emittances from them. Recent benchmarks show that the derived BPM emittances show similar emittance evolution and value to IPM and Multiwire data. This approach can both supplement and complement existing non-intercepting emittance monitors in accelerators.

Citations

• Fermilab Booster Beam Emittances from Quadrupole Modes Measured by BPMs
• A Study of the Gain of Microchannel Plates in the Ionization Profile Monitors at Fermilab
• The Ionization Profile Monitors in the Recycler Ring

Related

• Fermilab Booster Beam Emittances from Quadrupole Modes Measured by BPMs
• Expressing Properties of BPM Measurement System in Terms of Error Emittance and Error Twiss Parameters
• Time-of-flight Energy Measurements with BPMs
• Emittance Measurements with Wire Scanners in the Fermilab Side-coupled Linac
• Beam Position Monitor Electronics Upgrade for Fermilab Switchyard