Runaway electrons at nanosecond pulsed discharge in atmospheric pressure gases and higher
Amplitude-temporal parameters of a runaway electrons beam (RAEs beam) at a high-voltage nanosecond pulsed discharge in air, nitrogen and sulfur hexafluoride at a pressure range 0.05-0.3 MPa was investigated. High-voltage (≈ 200 kV) nanosecond (≈ 2 ns) pulses were applied across a point-to-plane discharge gap with length ~ 1 cm. RAEs beam was registered with a collector located downstream a grid anode and foil. It was established that a diffuse discharge is formed and RAEs beam is registered in air and nitrogen in whole pressure range. In sulfur hexafluoride diffuse discharge is also formed in whole pressure range, but RAEs beam is authentically registered up to 0.2 MPa. Amplitude of RAEs beam decreases with pressure increase. Time delay between moment of a RAEs beam registration and moment of applying of a voltage pulse across the gap increases with pressure increase.