Design and Test of a Long-Pulse Large Current Sensor With a Hall Probe Installed Inside

A high accuracy large current sensor which can directly output the current signal without integral has been designed, fabricated, and tested. It is composed of a coreless helix coil cut by pure copper tube and a hall probe installed inside. It has excellent linear performance due to the absence of iron core. The ability of resisting disturbance is much improved because the hall probe is installed inside. A calibrated prototype sensor has been applied on a 40 T long pulsed magnetic field system to output the current data as feedback signal. A long pulse magnetic field with 25.6 T/200 ms flat-top and ripples less than 0.02% was achieved.