High-power S-band fundamental-mode eight-beam klystron and gun design

Summary form only given. In multiple-beam amplifiers, beamlets are transported in individual beam tunnels but interact with RF fields in a common interaction region. This approach enables the designer to have the best of both worlds: individual beamlets can have low perveance which is conducive to efficient bunching and beam transport, leading to higher gain, electronic efficiencies, and average power, while the aggregate beam current can be high, facilitating high beam and RF power, and also broad bandwidth. A fundamental mode multiple-beam amplifier is described in this paper and we report on the design of a beam forming system for high-average-power broadband S-band multiple-beam amplifiers, developed at the Naval Research Laboratory (NRL). These amplifiers utilize eight individual electron beams and operates in the fundamental TM₀₁ mode.