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    Microwave window having dielectric variations for tuning of resonances
    2.
    发明授权
    Microwave window having dielectric variations for tuning of resonances 失效
    具有调谐谐振电介质变化的微波窗

    公开(公告)号：US3594667A

    公开(公告)日：1971-07-20

    申请号：US3594667D

    申请日：1968-11-15

    Applicant: VARIAN ASSOCIATES

    Inventor： MANN JOSEPH K

    IPC: H01P1/08

    CPC classification number: H01P1/08

    Abstract: A high-power microwave window structure is disclosed. The window structure includes a hollow waveguide having a dielectric wave permeable gastight partition sealed thereacross to form the window assembly. The window structure is capable of being impedance matched to the waveguide structure to provide a relatively wide passband. In certain windows the passband can be as wide as the recommended bandwidth for the waveguide itself. Such window structures are plagued by ''''trapped'''' and ''''ghost'''' resonant modes which are excited into resonance by slight asymmetries in the window structure. At their resonant frequencies, these modes couple energy from the main propogating mode to produce an impedance mismatch and at high-power levels, overheating and failure of the window structure. Thus, operation at high-power levels is typically restricted to frequency ranges between a pair of such resonant modes. The frequency separation between the resonant modes is increased to provide broader band operation by selectively tuning the resonant frequencies of these modes by selectively varying the electrical path length through the window structure for one or more of these modes. For example, the window is made thicker near the periphery where one of the resonant modes has its most intense electric fields and made thinner near the center where another of the modes has its intense electric fields to tune one of the modes higher in frequency, while the other mode is being tuned lower in frequency. The mean thickness of the window is maintained approximately constant such as not to change appreciably the passband for the main propagating mode. Alternatively, the dielectric constant for various portions of the window can be changed for changing the electrical path length through the window as aforedescribed.

    Charged particle analyzer with means to determine the coordinate position of the sample
    3.
    发明授权
    Charged particle analyzer with means to determine the coordinate position of the sample 失效
    用于确定样品坐标位置的充电颗粒分析仪

    公开(公告)号：US3686501A

    公开(公告)日：1972-08-22

    申请号：US3686501D

    申请日：1970-09-28

    Applicant: VARIAN ASSOCIATES

    Inventor： TAYLOR NORMAN J ,  MANN JOSEPH K ,  ATWOOD ALLEN W

    IPC: H01J37/252 ,  H01J49/48 ,  G01T1/36

    CPC classification number: H01J49/482 ,  H01J37/252

    Abstract: A cylindrical mirror analyzer is described having apparatus for quickly and accurately positioning the area of a sample to be investigated at the proper position for analysis. The cylindrical analyzer includes a pair of coaxial and radially spaced apart cylinders and suitable mechanism for supporting a sample to be investigated on their common axis. Means are provided for forming in the space between the cylinders a charged particle deflecting field which will deflect towards the inner cylinder any charged particles within such space which have issued from the sample. Slots in the inner cylinder define a path for the passage of particles from the sample into the space between the cylinders for deflection and then back through the inner cylinder to the cylindrical axis where such particles are collected for analysis of their energy. A screen of fluorescent material is disposed at a location at which it will be activated by particles issuing from the sample because of the bombardment, and a shield is disposed between the fluorescent screen and the sample to project an unactivated or shadow area on the screen. The positional relationship of the shadow on the screen is indicative of the coordinate position of the area on the sample from which the radiation is emitted and, hence, is indicative of the location of the area under investigation.

    Abstract translation: 描述了一种圆柱形镜面分析仪，其具有用于将待研究样品的面积快速准确地定位在适当位置进行分析的装置。 圆柱形分析器包括一对同轴和径向间隔开的圆柱体和用于在其共同轴线上支撑要研究的样品的适当机构。 提供了用于在气缸之间的空间中形成带电粒子偏转场的装置，其将朝向内圆柱体偏转，在该空间内从样品发出的任何带电粒子。 内筒中的槽限定了用于使颗粒从样品通过到用于偏转的气缸之间的空间的路径，然后通过内圆筒返回到圆柱轴线，其中收集这些颗粒以分析其能量。 荧光材料的屏幕设置在由于轰击而从样品发出的颗粒被激活的位置处，并且在荧光屏和样品之间设置屏蔽以在屏幕上投影未激活或阴影区域。 屏幕上的阴影的位置关系表示放射辐射的样品上的区域的坐标位置，因此表示被调查区域的位置。

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