Velocity modulation tube including a high resonance-frequency floating prebuncher having a q-value lower than a low resonance-frequency input cavity
AssigneeNippon Electric Co., Ltd.
InventorsTakao Kageyama, Yosihiro Morizumi
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Abstract
In a velocity modulation tube comprising a floating prebuncher and at least one final prebuncher, frequencies of respective fundamental modes of resonance of the input cavity, the floating prebuncher, and the final buncher are adjusted to the lowest frequency of the passband of the tube, adjacent to the highest frequency of the passband, and higher than the highest frequency, respectively. Furthermore, the Q-value of the floating prebuncher is made equal to or lower than that of the input cavity. Naturally, the output cavity has its fundamental mode of resonance approximately at the center of the passband.
Claims9
In a velocity modulation tube operable in a predetermined operating passband of frequencies, comprising in a vacuum envelope and successively in mutually spaced relation electron gun means for emitting an electron beam, an input resonator circuit having means for coupling thereto a source of energy external to said vacuum envelope, a first and a second floating resonator circuit, an output resonator circuit having means for coupling thereto a load external to said vacuum envelope, and a collector electrode for said electron beam, each of said input, first and second floating, and output resonator circuits having interaction gap means operatively associated with said electron beam for providing interaction between said electron beam and an electromagnetic field induced in the associated resonator circuit, said tube further comprising a plurality of drift spaces for said electron beam extending from the interaction gap means of said input resonator circuit backwardly of said electron beam towards said electron gun means, extending between said interaction gap means of said input, first and second floating, and output resonator circuits, and extending from the interaction gap means of said output resonator circuit forwardly of said electron beam towards said collector electrode, said second floating and output resonator circuits having fundamental modes of resonance at a frequency higher than the highest frequency of said passband and at an approximate center of said passband, said second floating resonator circuit having a Q-value greater than said input resonator circuit, the improvement wherein said input and said first floating resonator circuits have fundamental modes of resonance at frequencies adjacent to the lowest and the highest frequencies of said passband, respectively, and said first floating resonator circuit has a Q-value which is at most equal to the Q-value of said input resonator circuit.
Dependencies are inferred from the claim text.