Based on a prototype developed by S. Srinivasan and P.A. Duperrex at PSI, the CR-BCM is a re-entrant cavity resonator used as a beam current monitor. The CR-BCM operates at the fundamental mode of resonance, i.e. transverse magnetic mode tuned to a given harmonic of the beam repetition rate.
The fundamental mode of resonance is proportional to the beam current or to the bunch charge of single beam pulses. The re-entrant cavity resonator provides a position- and beam-size-independent response. Calibration check is possible without dismounting the cavity from the beam line.
Main features
- Beam repetition frequency from 30 MHz to 175 MHz
- Response time < 1 µs
- 100 mm axial length
- 300 mm external diameter
Downloads
Datasheets
Papers
- Reentrant cavity resonator as a beam current monitor (BCM) for a medical cyclotron facility
- Resonant Cavity for Beam Current Diagnostics in Medical Accelerators
Current price list
Applications
Cavity systems are known for providing a linear response over a large dynamic range and superior sensitivity compared to commonly used current monitors.
The CR-BCM is optimized for applications in charged particle radiation therapy facilities, FLASH experiments, radio-isotope production facilities.
Dimensions
The CR-BCM has fixed outer dimensions for any bunch repetition frequency between 30 MHz and 175 MHz:
- Axial length: 100 mm
- External diameter: 300 mm
CRCDS, a turn-key solution
CRCDS stands for Cavity Resonator Current Detection System.
To form a turn-key solution for low current measurement, the CR-BCM can be associated with:
- a low noise amplifier from Bergoz Instrumentation
- a dedicated digital readout system from Instrumentation Technologies
CRCDS is able to measure currents down to 1 nA with a 100 pA resolution in 500Hz.