Pulsed magnet system considerations for repetitive operation of high-power magnetrons

A tradeoff evaluations has been performed to specify a compact, low-loss pulsed electromagnet system for a repetition rate application of high-power magnetrons. The required magnetic field is 5 to 15 kG with 1% uniformity over the magnetron volume, and the pulse repetition rate is on the order of 5 pps. To drive the magnets, a recirculating driver scheme which transfers energy back and forth between two capacitor banks has been identified as a variable low-power-loss approach. The circuit comprises a 10-kW switching power supply, a high-voltage switch network, 400-kJ capacitor banks, and magnet coils. Several recirculating drive systems operating in the voltage range of 10 to 50 kV and output currents with a pulse duration of ≈10 ms are compared relative to their power losses, system size and weight, and their limitations at high pulse repetition rates