In this paper,a new pill-box window with arc groove disk is studied for S-band high power klystron.Its main characteristics are long pill-box and periodic grooved window disk.The long pill-box window can decrease the normal field and relieve the radio frequency loss in high power transmission,and periodic grooved window disk can suppress tangential field multipactor.The Monte Carlo(MC)method is used to build up the simulation model and analyze the increasing tendency of electrons.The simulation results indicate that long-box window with periodic arc grooved window disk can restrain multipactor effectively.Homocentric circular half-camber arc slot is put forward to overcome the disadvantages of periodic straight triangle and strait rectangular.The long pill-box with groove disk window prototype is tested in high power Travelling Wave Resonant Ring(TWRR)and the experimental results show an excellent character of this window.
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