Radiation Hardened Proton Meter for Fermilab External Beam Lines

A beam line current and charge monitor has been in use for several months with the following characteristics: (1) beam toroid in high radiation area 200 feet from electronics, and within 30 feet of the 140, 000 ampere pulsed neutrino horn, (2) response time adequate to permit accurate (1%) measurement of 1 turn fast-extracted beam, (3) digital and analogue readouts for full scale ranges of 2 × 1012, 1 × 1013, and 5 × 1013 protons per pulse, (4) computer readout and standardization via CAMAC, (5) pulse-to-pulse repeatability is 1 in 1000 on test pulses. There is no interference from the horn, which pulses at the same time as the beam.