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The Beam Charge Monitor (BCM) measures the total beam charge of pulsed beams.
It has a bipolar voltage output that is directly proportional to the total beam charge.
An Integrating Current Transformer (ICT) integrates the charge of pulses having width from less than a picosecond to more than a microsecond.
Specially developed hybrid circuits then amplifly the charge and integrate it with low noise and high linearity. A built-in Calibration Generator provides on-line assurance of measurement reliability.

                  Pasted Graphic                            BCM-RFC 19" chassis equipped with 2 BCM modules and 1 ICT (In-flange.ICT version)

Two versions are available:

  ■  Integrate-Hold-Reset (BCM-IHR), for pulse repetition rates from 10kHz down to single pulses
  ■  Continuous Averaging (BCM-CA), for pulse repetition rates from 10MHz down to 5kHz

A very low noise wide-band preamplifier (BCM-WBA) allows the measurement of low-intensity beams pulsed up to 5MHz.
dbcm3On circulating machines, the stored beam current is measured with better than 10nA rms resolution. On transfer lines or linacs, single pulses are measured with 3E6 particles resolution.

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ICT can be embedded inside a conflat flange fo direct mounting on the beam pipe.
See In-Flange.CT.