公开(公告)号：US3843902A

公开(公告)日：1974-10-22

申请号：US43967474

申请日：1974-02-04

Applicant: VARIAN ASSOCIATES

Inventor： MIRAM G ,  KUEHNE G

IPC: H01J3/02 ,  H01J23/065 ,  H01J1/48 ,  H01J1/94 ,  H01J19/48

CPC classification number: H01J3/029 ,  H01J3/026 ,  H01J23/065

Abstract: A gridded convergent flow electron gun employs a dimpled oxide coated thermionic cathode emitter facing a centrally apertured accelerating anode. A multiapertured control grid is interposed in the space between the dimpled oxide coated cathode and the anode for pulsing the electron beam. A multiapertured shadow grid is disposed overlaying the emitting surface of the cathode emitter with the apertures of the shadow grid being in alignment and in registration with the respective dimpled areas of the emitter and the corresponding apertures in the control grid for projecting a multiplicity of non-intercepting convergent flow beamlets through the individual holes in the control grid. The shadow grid is placed in nominal contact with the cathode emitter and is made of a material having essentially the same coefficient of thermal expansion as the cathode. In a preferred embodiment, the cathode includes a nickel base member and the shadow grid is made of nickel.

Abstract translation: 网格收敛流电子枪采用面向中心多孔加速阳极的凹凸氧化物涂层热电子阴极发射体。 多孔化控制栅格插入在凹凸氧化物涂覆的阴极和阳极之间的空间中，用于脉冲电子束。 多个投影的阴影栅格被布置为覆盖阴极发射器的发射表面，其中阴影栅格的孔对准并与发射器的相应的凹坑区域对准，并且控制栅格中的相应孔径突出， 拦截收敛流束通过控制网格中的各个孔。 阴影栅格被放置为与阴极发射体标称接触，并且由具有与阴极基本相同的热膨胀系数的材料制成。 在优选实施例中，阴极包括镍基构件，阴影栅格由镍制成。