Application of TPI1-10k/50 thyratrons for building a modulator, intended for supply of inductive-resistive load in double-pulse mode

The circuit of modulator, serving to supply inductive-resistive load in double-pulse mode with currents up to 10 kA and pulse duration of 300 ns, is described. As switching components thyratrons (pseudospark switches) designated as TPI1-10k/50 with anode voltage up to 50 kV have been used. TPI-thyratrons are capable of operating in circuits with grounded cathode, which allows obtaining higher performance reliability and longer service lifetime in contrast to other known designs of pseudospark switches, operating with grounded grid. The thyratrons can be considered as alternative to present switches, including hot cathode hydrogen thyratrons and up-to-date power solid state devices, especially for switching of high-currents with sub-nanosecond jitter, turn-on time of 3÷5 ns and average current up to 0.3 A. The results of tests, confirming possibility of reverse dielectric strength recovery within some microseconds after switching of 10 kA forward anode current, are presented. Basic electrical parameters, effecting thyratron operation in the indicated mode, are analyzed. To clarify prospects of further development of TPI-thyratrons, pentode version of the thyratron, serving to reduce recovery time, is designed.