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。

公开(公告)号：US3832596A

公开(公告)日：1974-08-27

申请号：US35106573

申请日：1973-04-13

Applicant: VARIAN ASSOCIATES

Inventor： NELSON R ,  LIEN E ,  MIRAM G

IPC: H01J23/087 ,  H01J23/065 ,  H01J25/34

CPC classification number: H01J23/065

Abstract: A high convergence magnetically focused linear beam tube includes a pair of magnetic pole piece structures at opposite ends of the interaction circuit. At least one of the magnetic pole piece structures includes a centrally apertured transverse wall and an axial tubular projection extending away from the transverse wall for shaping the magnetic field externally of the region of the interaction circuit. The diameter of the central aperture is predominantly determinative of the gradient of the convergent axial magnetic field in the high field region, i.e., greater than 50 percent of the maximum axial magnetic field especially in the region of the beam near the beam minimum. The beam aperture is surrounded by a non-magnetic gap in the pole piece structure for independently controlling a certain amount of leakage of magnetic field through the pole piece structure to predominantly determine the magnitude of the axial magnetic field in the low field region, i.e., less than 10 percent of the maximum axial magnetic field intensity externally of the interaction circuit. Controlling the gap width is useful in the case of permanent magnet focusing for moving the point of magnetic field reversal away from the interaction circuit at either the collector or cathode end of the tube to obtain a desired shape of the magnetic flux divergence or convergence.

Abstract translation: 高收敛磁聚焦线性束管包括在相互作用电路的相对端的一对磁极片结构。 磁极片结构中的至少一个包括中心有孔的横向壁和远离横向壁延伸的轴向管状突起，用于使相互作用电路的区域外部的磁场成形。 中心孔的直径主要决定于高场区域中的会聚轴向磁场的梯度，即大于最大轴向磁场的50％，特别是在光束最近的波束区域。 光束孔径被极片结构中的非磁隙包围，用于独立地通过极片结构控制一定量的磁场泄漏，以主要确定低场区域中的轴向磁场的大小，即， 小于相互作用电路外部最大轴向磁场强度的10％。 控制间隙宽度在永磁体聚焦的情况下是有用的，用于在管的集电极或阴极端处使磁场反转远离相互作用电路，以获得磁通发散或收敛的期望形状。

公开(公告)号：US3809957A

公开(公告)日：1974-05-07

申请号：US12111771

申请日：1971-03-04

Applicant: VARIAN ASSOCIATES

Inventor： MIRAM G ,  WOOLSEY S

IPC: H01J3/02 ,  H01J7/14

CPC classification number: H01J3/02

Abstract: A method for preserving electron gun assemblies is disclosed. In the method, an electron gun assembly, including a thermionic cathode emitter, is assembled in a vacuum envelope structure. The envelope is evacuated, baked out, and the cathode processed in the conventional manner to activate the cathode. Beam voltages are applied to draw beam current from the gun to test proper operation thereof. These tests may include a test of beam diameter and perveance in the presence of a beam focusing magnetic or electric field. The processed and tested electron gun is then valved off from the rest of the envelope by means of a valve connected to the envelope portion including the electron gun. The valved off gun is then detached from the vacuum envelope for preserving the electron gun in an operable condition for subsequent use in a second vacuum envelope structure.

Abstract translation: 公开了一种保护电子枪组件的方法。 在该方法中，包括热离子阴极发射器的电子枪组件被组装在真空封壳结构中。 将外壳抽真空，烘干，并以常规方式处理阴极以激活阴极。 施加光束电压以从枪射出束电流以测试其正确的操作。 这些测试可以包括在存在聚焦磁场或电场的光束的情况下对光束直径和光斑的测试。 然后，通过连接到包括电子枪的包络部分的阀，将经处理和测试的电子枪与封套的其余部分隔开。 然后将取出的喷枪与真空外壳分离，以将电子枪保持在可操作的状态，随后用于第二真空外壳结构。

公开(公告)号：US3809939A

公开(公告)日：1974-05-07

申请号：US30470372

申请日：1972-11-08

Applicant: VARIAN ASSOCIATES

Inventor： MIRAM G ,  MIZUHARA Y

IPC: H01J23/065 ,  H01J1/02

CPC classification number: H01J23/065

Abstract: The gridded gun of an electron tube includes an annular high voltage beryllia insulator body having good thermal conductivity. The thermionic cathode emitter is mounted within the central bore in the annular beryllia insulator in thermally insulative relation relative to the insulator body. The control grid and focus electrode for the gun are mounted from the surface of the annular insulator facing the anode. The outer periphery of the annular insulator is mounted to the body of the electron tube in heat exchanging relation therewith, such that the control grid is cooled by thermal conduction through the beryllia insulator body to the cooled main body of the electron tube.

Abstract translation: 电子管的格栅枪包括具有良好导热性的环形高压铍绝缘体。 热离子阴极发射器以相对于绝缘体的热绝缘关系安装在环形铍绝缘体的中心孔内。 用于枪的控制栅格和聚焦电极从面向阳极的环形绝缘体的表面安装。 环形绝缘体的外周与电子管的主体以热交换的方式安装在该电子管的主体上，使得控制栅由通过铍绝缘体的热传导冷却到电子管的冷却主体。