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    Electron gun
    71.
    发明授权
    Electron gun 失效
    电子枪

    公开(公告)号：US4363995A

    公开(公告)日：1982-12-14

    申请号：US189908

    申请日：1980-09-23

    Applicant: Tadahiro Takigawa ,  Isao Sasaki ,  Kazuo Tsuji

    Inventor： Tadahiro Takigawa ,  Isao Sasaki ,  Kazuo Tsuji

    IPC: H01J1/15 ,  H01J1/16 ,  H01J3/02 ,  H01J37/06 ,  H01J1/14

    CPC classification number: H01J1/15 ,  H01J3/02 ,  H01J37/06

    Abstract: An electron gun having a cathode of a lanthanum hexaboride single crystal is disclosed in which the axis of the cathode is set to such a crystal orientation that the electron beam has two intensive emission regions which are asymmetrical with each other in intensity. In the electron gun, even at a low heating temperature of the cathode, a single spot of an image by the electron beam of a more intensive emission region since the electron beam of a weaker intensity emission region is blocked by an aperture.

    Abstract translation: 公开了一种具有六硼化镧单晶阴极的电子枪，其中阴极的轴线被设定为使得电子束具有彼此强度不对称的两个密集发射区域的晶体取向。 在电子枪中，即使在阴极的低加热温度下，由于较弱强度发射区域的电子束被孔径阻挡，所以由更强烈的发射区域的电子束形成的单个点的图像。

    Temperature control for an indirectly heated cathode for a high power electron beam gun
    72.
    发明授权
    Temperature control for an indirectly heated cathode for a high power electron beam gun 失效
    用于高功率电子束枪的间接加热阴极的温度控制

    公开(公告)号：US3885194A

    公开(公告)日：1975-05-20

    申请号：US35601873

    申请日：1973-04-30

    Applicant: WESTINGHOUSE ELECTRIC CORP

    Inventor： SCHUMACHER BERTHOLD W

    IPC: G05F1/46 ,  H01J37/06 ,  H01J37/24 ,  H05B39/04

    CPC classification number: G05F1/46 ,  H01J37/06 ,  H01J37/242

    Abstract: A method and apparatus for regulating and determining the temperature of a heated cathode in an electron beam system to regulate the magnitude of the beam current both during operation and prior to turn on. This is accomplished by measuring the thermionic emission of a well defined area of the cathode, regardless of whether the electron beam is being drawn from the cathode, and utilizing this measured signal to control the temperature of the heated cathode.

    Abstract translation: 一种用于调节和确定电子束系统中的加热阴极的温度的方法和装置，以在操作期间和接通之前调节束电流的大小。 这通过测量阴极的良好限定区域的热离子发射来实现，而不管电子束是否从阴极吸取，并且利用该测量信号来控制加热的阴极的温度。

    METHOD FOR EVALUATING THERMIONIC ELECTRON EMITTER IN SITU
    78.
    发明公开
    METHOD FOR EVALUATING THERMIONIC ELECTRON EMITTER IN SITU 审中-公开

    公开(公告)号：US20240290594A1

    公开(公告)日：2024-08-29

    申请号：US18176195

    申请日：2023-02-28

    Applicant: NuFlare Technology, Inc. ,  NuFlare Technology America, Inc.

    Inventor： Victor Katsap

    IPC: H01J45/00 ,  H01J37/06 ,  H01J37/22 ,  H01J37/24

    CPC classification number: H01J45/00 ,  H01J37/06 ,  H01J37/22 ,  H01J37/24

    Abstract: A method of assessing thermionic electron emitter quality, comprising heating a thermionic electron emitter to an emission temperature thereby causing the emitter to emit electrons, forming the electrons emitted by the emitter into an electron beam, directing the electron beam to an image detector thereby forming an image corresponding to electron emission from a surface of the emitter, and detecting a presence or absence in the image of a pair of intersecting bright band features, each band feature being formed from two parallel lines, the band features corresponding to crystal lattice planes of the emitter. The presence of one pair of intersecting bright band features indicates a single-crystal emitter. The absence of a pair of intersecting band features indicates an amorphous or contaminated emitter. The presence of more than a single pair of intersecting bright band features indicates a polycrystalline emitter. The method is particularly useful for rare-earth hexaboride emitters.

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