Design of self-triggering parallel Marx generator with thyristor

Abstract

We use a thyristor with a charging direct current (DC) power of 600 V as the circuit switching element and a Marx generator structure combined in series and parallel to design a high current pulse generator for long magnetic lens. According to the current driving characteristic of thyristors, the gate electrode is grounded through the current stabilizing inductance and current limiting resistance to form a self-triggering structure. The circuit output and the self-triggering waveform of thyristors at all levels are simulated. Under the load resistance of 500 mΩ and load inductance of 1.14 mH, a pulse current with amplitude of -1.1 kA and pulse width of 2.68 ms is obtained. The current pulse is used to excite a long magnetic lens, and a magnetic field with a duration of 1.2 ms and an intensity higher than 0.6 T is obtained. The influence of parameters such as charging voltage, energy storage capacitor, and the number of parallel stages of the circuit on the amplitude and width of the pulse current is studied. When the charging voltage increases, the pulse current becomes larger and the width remains unchanged. When the value of the energy storage capacitor and the number of parallel stages increase, the amplitude of the pulse current becomes larger and the pulse width becomes wider.