Plasma switch with hollow, thermionic cathode
    33.
    发明授权
    Plasma switch with hollow, thermionic cathode 失效
    等离子开关,带有空调,THERMIONIC CATHODE

    公开(公告)号:US5075594A

    公开(公告)日:1991-12-24

    申请号:US406673

    申请日:1989-09-13

    CPC classification number: H01J17/063 H01J17/54 H01T2/02

    Abstract: A hollow cathode capable of self-heating by back ion bombardment to a thermionic emission temperature axially discharges therefrom an ionized plasma of an ambient gas such as xenon. Electrons are axially or radially extractable from the plasma by an anode. A voltage is applied to a keeper electrode disposed between the cathode and anode to sustain plasma discharge of the gas between the cathode and keeper electrode. A control electrode is disposed between the keeper electrode and the anode. Application of a positive voltage (relative to the cathode) to the control electrode causes the plasma discharge to extend from the cathode to the anode, thus closing the switch. Application of a negative control electrode voltage, or simply returning the control electrode to cathode potential, causes the plasma discharge to retract back to the area of the keeper electrode, thereby opening the switch.

    Photoemissive trigger for backlighted thyratron switches
    34.
    发明授权
    Photoemissive trigger for backlighted thyratron switches 失效
    背光式闸流闸开关的发光触发器

    公开(公告)号:US5057740A

    公开(公告)日:1991-10-15

    申请号:US531127

    申请日:1990-05-31

    CPC classification number: H01J17/54 H01J17/30

    Abstract: Provided is a means for triggering certain high voltage electronic, gas discharge switches that are a novel type of high power thyratron. Triggering of switches of the so-called "backlighted thyratron" type (a type of cold cathode thyratron) is enhanced by the inclusion of a very small, photoemissive cathode, separate and isolated from the main switch electrodes, to initiate the triggering discharge. The trigger cathode is protected from destruction by the main discharge current through the switch by mechanically and electrically isolating it from further participation in the discharge once the triggering process has been initiated. Alternatively, photosensitive material is coated on the backside of one of the main switch electrodes. A light source located externally of the switch directs light through a sealed aperture into the interior of the switch where it is incident on the photosensitive material generating electrons which in turn trigger the main switch discharge.

    Abstract translation: 提供了一种用于触发作为新型高功率闸流管的某些高压电子气体放电开关的手段。 所谓的“背光式闸流闸”型(一种冷阴极闸流管)的开关的触发通过包含与主开关电极分离和隔离的非常小的光发射阴极来引发触发放电来增强。 一旦触发过程已经启动,触发阴极就可以通过机械和电气隔离,使其免受主放电电流的破坏。 或者,感光材料涂覆在主开关电极之一的背面。 位于开关外部的光源将光通过密封孔引入开关的内部,在其内部入射到感光材料上,从而产生电子,从而触发主开关放电。

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