Pulse generators with nanosecond leading edge duration based on TPI-type pseudospark switches for FEL complex

For FEL (Free Electron Laser) complex used at the Duke University, pulse generators (kickers) of Injection, Extraction and Generator of injection into a big ring have been developed and built. As fast switches TPI-type thyratrons (PSS - pseudospark switches) have been employed. In contrast to other pseudospark switches the TPI-thyratrons are capable of operating in circuits with grounded cathode, which offers lifetimes up to 20 000 hours. The thyratrons can be considered as alternative to well-known switches, including hot cathode hydrogen thyra-trons and up-to-date power solid state switches, whereas being more compact and cost-effective. The absence of hot cathode provides for turn-on time of the TPIs about 3÷5 ns in the modes with thousands-amperes peak currents and sub-nanosecond jitter. The results of over 1.5 years of the pulse generators service are presented.