Background The 10 MA device is a large-scale pulsed power driver with multi-channel parallel operation, which achieves a load current waveform with a relatively long rise time through the unsynchronized discharge of 24 modules.
Purpose To analyze the effectiveness of current measurement results in the load zone when studying the asynchronous discharge method of the 24-channel module, experimental analysis was conducted.
Methods The test experiments for currents with leading edges less than 100 ns and those exceeding 400 ns were designed to compare the measured waveforms and amplitude deviations of currents with different leading edges. Under extreme conditions at a single angular direction modules discharge experiments, the output signals of current probes at various angular orientations were compared, discussing the non-uniformity of current density and contrasting the measurement results between current probes and Rogowski coil.
Results Calibration experiments show that using the sensitivity coefficient calculated with short pulses (front edge approximately 90 ns) to compensate for currents with front edges exceeding 400 ns yields accurate waveforms, with amplitude deviations of only about 1%. Experiments involving feeding electrical pulses at a single angular direction demonstrate that under the condition of time-sharing discharge conditions, the magnetic field distribution along the inner magnetic insulation line is essentially uniform. The B-dot measurement results deviate by approximately 1.4% from those obtained using Rogowski coil.
Conclusions For the 10 MA device under time-sharing discharge conditions, the current probe measurements in the load region are valid.
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