Dielectric guide for electron beam transport
    32.
    发明授权
    Dielectric guide for electron beam transport 失效
    电子束传输电介质导体

    公开(公告)号:US4079285A

    公开(公告)日:1978-03-14

    申请号:US548438

    申请日:1975-02-10

    Inventor: Roger G. Little

    CPC classification number: G21K1/093 H01J1/48

    Abstract: An evacuated enclosure in the form of a cylindrical cavity having a dielectric located therein defines a dielectric guide for transporting an electron beam introduced into the cavity. The dielectric, which is disposed about the cavity wall, is operative to trap the charge associated with normal vacuum expansion of the electron beam. The trapped charge, in cases where the injected electron beam is not space charge limited, modifies the electric fields within the cavity in such a way as to provide focusing forces on the electron beam propogating through the cavity, the focusing forces being sufficient to guide a major portion of the beam through the enclosure without attenuation. Within the injected beam is space charge limited, the trapped charge induces an electrical discharge -- either surface flashover or volume puncture of the dielectric -- which liberates gaseous material. This gas then ionizes, is attracted by space charge electric fields into the body of the beam, and provides space charge neutralization. In this situation the beam is confirmed by its self-magnetic field and propogates through the cavity with little attenuation.

    Abstract translation: 具有位于其中的电介质的圆柱形腔形式的抽真空的外壳限定用于传送引入空腔的电子束的电介质引导件。 围绕腔壁设置的电介质可操作以捕获与电子束的正常真空膨胀相关的电荷。 捕获的电荷在注入的电子束不受空间电荷限制的情况下,以这样一种方式改变空腔内的电场,以便对通过空腔传播的电子束提供聚焦力,聚焦力足以引导 光束通过外壳的主要部分没有衰减。 在注入的光束中,空间电荷受限,捕获的电荷会引起放电 - 释放气体材料的电介质的表面闪络或体积穿透。 然后这种气体电离,被空间电荷的电场吸引到光束的体内,并提供空间电荷中和。 在这种情况下,光束通过其自身磁场得到确认,并且通过腔很少衰减地传播。

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