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    Low power reentrant stream crossed-field noise generator tube
    111.
    发明授权
    Low power reentrant stream crossed-field noise generator tube 失效
    低功率雷达流场交叉场噪声发生器管

    公开(公告)号：US3609581A

    公开(公告)日：1971-09-28

    申请号：US3609581D

    申请日：1969-07-25

    Applicant: VARIAN ASSOCIATES

    Inventor： MCDOWELL HUNTER L

    IPC: H01J25/44 ,  H01J25/34 ,  H03B29/00

    CPC classification number: H01J25/44

    Abstract: A crossed-field reentrant stream noise generator tube is disclosed. The tube is of the circular crossed-field geometry having a cathode electrode structure coaxially disposed of an anode electrode structure to define an unobstructed crossed-field interaction region in the space between the anode and cathode such that the electron stream can circulate completely around the cathode. The cathode electrode structure includes one or more thermionic emitter buttons forming the emitting portion and the remaining portion of the cathode forms a nonemitting sole structure. A microwave circuit is formed in the anode structure facing an arcuate portion of the cathode structure. In one embodiment, the nonemitting sole portion of the cathode structure is treated to inhibit secondary emission therefrom by reducing the secondary emission ratio of the surface to less than 1. In a second embodiment, the nonemitting sole portion of the cathode structure is biased negatively relative to the thermionic emitter to prevent bombardment of the sole and thus to inhibit secondary emission therefrom.

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