bergoz Instrumentation
ICT
Integrating Current
Transformer
Transformer
To measure the charge of very short
pulses
The Integrating Current Transformer (ICT) is a
capacitively shorted transformer and a fast read
out transformer in a common magnetic circuit
designed to measure the charge in a very short
pulse with high accuracy.
The ICT integrates the signal with a time constant of 1 to 20 nanoseconds, depending on the model.
Eddy current losses are negligible and the instrument is a very linear integrator for the very high frequency spectrum typical of a bunched beam signal.
The ICT integrates the signal with a time constant of 1 to 20 nanoseconds, depending on the model.
Eddy current losses are negligible and the instrument is a very linear integrator for the very high frequency spectrum typical of a bunched beam signal.
Measurements done in 1987 on the electron/positron
collider CESR at Cornell University :
■ linearity error < 3 x10-4 for a bunch length variation of 20% (56ps to 70 ps)
■ beam position dependency error <10-4 for ±10 mm of beam axis change (off-center).
■ The temperature dependence is negligible.
■ linearity error < 3 x10-4 for a bunch length variation of 20% (56ps to 70 ps)
■ beam position dependency error <10-4 for ±10 mm of beam axis change (off-center).
■ The temperature dependence is negligible.
■ Integrates
a very fast pulse with rise time in the order of
picoseconds with no significant loss.
■ The ICT magnetic core and associated windings are essentially noise free.
■ Measurement noise (measurement resolution) is determined by the signal processing.
■ Down to 0.1 nA rms noise with a preamplifier
■ Input current rise time < 1 ps
■ Pulse charge to output ratio 100:1, 50:1, 20:1, 10:1, 5:1
■ Input pulse length < 2 us ( more on option)
■ Linearity error < 0.1%
■ Off-center position sensitivity: 0.01%/mm (on axis)
■ The ICT magnetic core and associated windings are essentially noise free.
■ Measurement noise (measurement resolution) is determined by the signal processing.
■ Down to 0.1 nA rms noise with a preamplifier
■ Input current rise time < 1 ps
■ Pulse charge to output ratio 100:1, 50:1, 20:1, 10:1, 5:1
■ Input pulse length < 2 us ( more on option)
■ Linearity error < 0.1%
■ Off-center position sensitivity: 0.01%/mm (on axis)
ICT can be embedded inside a conflat flange fo
direct
mounting on the beam pipe. See In-Flange.CT
mounting on the beam pipe. See In-Flange.CT
Photo LBL.
ICT with shield and wall current bypass
removed