Research Of A Subnanosecond Gas Switch In UWB High-power Pulse Radiate Source

Pulsed power technology has been used extensively in the fields of scientific experiments, national defense, biomedicine and environmental protection etc. Subnanosecond gas switch stems from the rapid development of the requirements of pulsed power system. It is the key component of pulsed power system. The research on the gas discharge of Nanosecond pulse's gas breakdown, which promote research in the field of perfection and development of great theoretical and practical significance.There is no ideal model to describe the gas discharge because the process of gas discharge concerns lots of affecting factors and different aspects of substance microstructure(including electron, atom, molecule and photon). This thesis based on the electron collision ionization theory of Townsend and streamer theory, subnanosecond gas switch breakdown process is modeled and simulated with the finite element software ANSYS. The thesis has analyzed the subnanosecond gas switch performance through changing the electrode shape, the electrode spacing and electrode material. Requiring a gas switch to bear high voltage, high current, long life-time, fast turn-on time and low jitter. It is Required that the gas switch has the abilities of fast on-time, long life span and recovery insulation.Simulation results show that in the high-voltage and small gap switch, the flat-panel electrode is not used because it has great dispersion and poor stability when gas is broken down. With the decrease of the distance between electrodes, the peak current density becomes greater. The energy consumption of the gas switch sparks relates with the current intensity. The greater the current is, the more hot gas and charged particles are generated in the switch channel when the gas switch is broken down. The recovery speed of the switch becomes slower after the close of the switch.