Mode Control Apparatus for a Separable-Insert Coaxial Magnetron.
DEPARTMENT OF THE NAVY WASHINGTON DC
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A standard demountable coaxial magnetron has a cathode and a surrounding anode shell formed with slots through which electromagnetic energy is coupled into an external resonant stabilizing cavity. The anode and its associated components are contained in a vacuum-sealed interaction cavity envelope separably mounted in the sleeve-like body of the stabilizing cavity. A ceramic window sealably covers the slots and has its axial ends coupled to the axial ends of the anode shell by kovar strips. Since various unwanted modes of oscillation, such as the TE sub 121 mode, occur in the external resonant cavity, standard mode-suppression TE sub 121 chokes are used. Such a choke includes a high rf loss absorber carried in a choke cavity formed between the cavity and the anode. However, the kovar strips also extend through this choke cavity and, in many cases, seriously interfere with mode suppression. A knitted gasket placed near the choke cavity entrance between the kovar strip and the anode shorts the kovar to effectively reduce its impedance and permit excitation of the absorber. The knitted structure provides a needed flexibility. Author
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