ICT integrates bunch charge without loss
High sensitivity for pC resolution pulse measurement
BCM-IHR full scale ranges 400pC to 800nC | Noise in single bunch 0.55 pCrms |
ICT combines two nested transformers: a shorted one-turn current transformer loads the full bunch charge instantly into capacitors. Then the charge is transferred to the output by a readout transformer, at a slow pace, to avoid core losses. Cores are specially annealed to lower their coercive field and further minimize core loss. The ICT signal is integrated by BCM-IHR, a boxcar type synchronous differential detector. The output voltage proportional to the beam pulse charge is available 30μs after the trigger. It is maintained up to 400μs, then reset. Another pulse can then be measured.
In-flange ICT are mounted directly in the beam line. UHV compatible |
In-air ICT installation, over the vacuum chamber requires installation of a “gap” to prevent the wall current from flowing through the ICT aperture. The gap can be a brazed ceramic ring or an organic material O-ring depending on the vacuum requirements. Typical installations include bellows, a wall current bypass and an electromagnetic shield enclosing the ICT completely. |
BCM-IHR-E processes the signal from an ICT.
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Temperature | |
In-air models: | 100°C (212°F) any time |
In-flange models: | 100°C (212°F) any time |
Core saturation | 2 mT radial field |
Radiation damage | Standard SMA PTFE: 1E3 Gray max |
ICT Sensitivity | From 0.5Vs/C to 20Vs/C |
Full scale ranges (BCM) | |
Most sensitive Least sensitive | 800pC, using 5Vs/C ICT 400nC, using 0.5Vs/C ICT |
Noise single bunch | 0.55pCrms |
Output | ±8V, available 50µs after trigger |
Calibration pulses | 1pC, 10pC, 100pC, 1nC, accuracy ±2% |
