| Popis: |
This report documents the development of a current transformer system used to measure pulsed ion beam currents with at wide dynamic intensity range (nA to mA, a factor of 106). Peak beam currents a the LAMPF accelerator typically range from 100 nA to 40 mA with pulse widths varying from 30 to 1000 μs. Signal conditioning of the peak current output provides an average current readout with a range of 1 nA to 2 mA, noise of approximately ±0.5 nA, and accuracy of ±0.1%. Since the system has proved stable and highly reliable, calibration is performed yearly. The prototype unit was built in 1985 and the final production unit was completed in early 1989. |
