Nonthermionic cathode discharge devices
    1.
    发明授权
    Nonthermionic cathode discharge devices 失效
    非线性阴极放电装置

    公开(公告)号:US3614510A

    公开(公告)日:1971-10-19

    申请号:US3614510D

    申请日:1969-06-02

    摘要: A nonthermionic cathode glow discharge device comprising an enclosure and means to maintain gas in the enclosure at a predetermined pressure. An anode is mounted in the enclosure or forms a part of a wall of the enclosure. A cathode having a surface directed at a treatment zone is suspended in the enclosure and has an aperture therein in which is positioned a control electrode. The said surface of the cathode may extend longitudinally or may be shaped as a segment of a sphere. By varying the potential applied to the control electrode with respect to the cathode, the focal point of the electron or ion beam and the current of the output beam can be controlled. A third electrode may be provided to surround part of the cathode to act as a screen to minimize unwanted electron emission from the cathode.

    Electron gun and electron beam apparatus field of invention

    公开(公告)号:US20070228922A1

    公开(公告)日:2007-10-04

    申请号:US11703406

    申请日:2007-02-08

    申请人: Mamora Nakasuji

    发明人: Mamora Nakasuji

    IPC分类号: H01J29/00

    摘要: For three types of the electron gun the brightness larger than Langmuir limit or the very high Emittance is obtained through a simulation. The first electron gun consists of a concave cathode and a convex anode, and for the gun with the cathode radius of Rc (mm) the emission current Ie (A) which give the brightness larger than Langmuir limit is in the range as, 0.733Rc−0.5≦Ie≦0.159Rc3+0.35. Rc≦2.5 mm, or 0.733Rc−0.5≦Ie≦0.255Rc3−1.17. Rc>2.5 mm. The second electron gun consist of a flat cathode and a convex anode, and for the gun with a distance between the cathode and the anode of Dac (mm) the emission current Ie (mA) which give the brightness larger than Langmuir limit or the very high Emittance is in the range as, 0.388/Dac−0.046≦Ie≦92.8/Dac+9.28, Dac≧3 mm, or 0.388/Dac−0.046≦Ie≦22/Dac+32.7, Dac 120 μm).