at the beginning of the pulse. The cathode and grids of the tetrode tube are controlled by independent circuits. According to the cutoff curve of the tetrode provided by the manufacturer, the potential on grid G2 ranges from +1500 to +2500 V. In order to ensure that the tetrode completely closes, the potential on the tetrode control grid G1 must be below −750 V. In our power system, the potential on control grid G2 is +1700 V. The potential on grid G1 is controlled by a TTL driving unit based on PLC. When the triggering signal takes effect, the potential on control grid G1 increases from −840 (closing potential) to +200 V (opening potential). The tetrode remains switched on as long as the TTL pulse is present. The output voltage and current are detected by the capacitance divider and current monitor, respectively.