A high precision & non-destructive types of current monitors using Ni-
Zn ferrite toroids for the measurements of electron beam currents has
been developed. This monitoring system consists of Ni-Zn ferrite toroi
dal cores, pickup coils, electromagnetic shields, a monitoring housing
, current amplifiers & ceramic ducts. The fast current monitors showed
fast rise & fall times (< 3 ns), the linearity within 2%, the high se
nsitivity (0.05 V/mA at 50 Omega load) & good S/N ratio.