Design of a multi beam electron gun for 352.2 MHz, 100 kW (CW) power klystron

Conventional klystrons using single beam of electrons have several limitations for increasing of beam voltage or current which can be overcome using multiple electron beams. The paper presents the design of a single beam electron gun for a practical 100 kW CW conventional klystron and then translation of the design into a five-beam gun for reducing operating voltage and overall improvement in tube performance. The design parameters of multi beam electron gun have been derived from existing single beam parameters using some scaling laws, and are further optimized through CST Particle Studio. The simulation results of CST have been cross-validated using Opera-3D code. The electron gun is currently under development.