800-keV electron induction injector with high average power

For many applications of intense electron beams, including flash radiography and free-electron lasers, multikiloampere currents and low emittance are required. The report deals with the development of an injector ensuring these demands. Design parameters of the injector are 800 keV beam energy, 2...5 kA current, 80 ns pulse flat top and 100 Hz repetition rate. The average power of the series of pulses is 40 kW. The injector contains seven induction modules in series to generate 0.8 MV diode potential. The voltage contributions of seven modules, at 120 kV each, are summed along the cathode stem as it threads through the seven units. The modules use amorphous alloy and permalloy cores. The injector has been designed to provide two modes of operation: with a low and high current electron beam respectively. A velvet cathode and a mesh-less anode are used to produce an electron beam with the current of 2 kA and the brightness of 2.4 10³A/(cm rad)² in the first mode. A 800 keV, 5 kA electron beam is derived by a mesh anode in the second mode. The modules of the induction injector and its parameters are described in this report