Speaker
Description
To satisfy the beam power upgrade from 100 kW to 500 kW for the China Spallation Neutron Source Phase II (CSNS-Ⅱ), 30 sets of high-efficiency and miniaturized P-band (324 MHz/648 MHz) klystrons will be deployed for the linear superconducting accelerator, with the development of fully domestic klystrons initiated. Traditional P-band single-beam klystrons adopt double-reentrant cylindrical resonant cavities, which suffer from large structural size, long tube length and high construction and maintenance costs due to the dimensional resonance effect. For klystron miniaturization, a P-band klystron RF structure based on capacitively loaded coaxial cavities is proposed as an alternative technical scheme. The structure comprises five resonant cavities, with coaxial waveguide coupling at the input and WR2300 rectangular waveguide coupling at the output, and a second harmonic cavity introduced via the CSM method. 3D particle-in-cell simulation results show that under 100 kV beam voltage, 65 A beam current and 500 W input power, the structure achieves 1.5 MW peak output power and 8.5 MHz bandwidth, with its longitudinal length reduced by ~24% compared with commercial counterparts.
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