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    • 4. 发明授权
    • Magnetic lens assemblies for corpuscular ray devices which operate under vacuum
    • 用于在真空下操作的微波设备的磁性镜头组件
    • US3900808A
    • 1975-08-19
    • US64862367
    • 1967-06-26
    • ZERBST HELMUTWEYL REINHARDDIETRICH ISOLDE
    • ZERBST HELMUTWEYL REINHARDDIETRICH ISOLDE
    • H01J37/141H01F7/00
    • H01J37/1416Y10S505/871
    • A corpuscular ray device having a magnetic lens assembly. Although the invention is particularly applicable to objective lens assemblies of electron microscopes which operate under vacuum, it is also applicable to lens assemblies for ion microscopes, electron-diffraction devices, or other corpuscular ray apparatus wherein the rays are situated in tubular enclosures. The magnetic lens assembly includes a pair of shielding cylinders which are coaxial and spaced from each other, which are made of a superconductive material, and which have their common axis coinciding with a lens axis of the lens assembly, these shielding cylinders being surrounded by a lens winding which may also be made of a superconductive material and which serves to generate the magnetic field which is concentrated by the shielding cylinders in the region of the corpuscular ray. These shielding cylinders have directed toward each other a pair of end faces which are spaced from each other and define between themselves a lens gap which is devoid of any shielding components made of superconductive material. The aperture error constant of the lens assembly depends upon the maximum value of the field intensity in the lens gap and upon the field gradient along the lens axis in the lens gap. The magnitude of the lens gap is chosen in such a way that with a predetermined value of field intensity outwardly beyond the lens gap and the shielding cylinders the maximum value of the field intensity in the lens gap and the field gradient in the lens gap along the lens axis provide for the lens assembly an aperture error constant which is less than a predetermined value of aperture error constant.
    • 5. 发明授权
    • Magnetic lens arrangement
    • 磁性镜片布置
    • US3708772A
    • 1973-01-02
    • US3708772D
    • 1971-11-30
    • SIEMENS AG
    • LE FRANC G
    • H01J37/141H01F7/00
    • H01J37/1416Y10S505/871
    • A highly compact magnetic lens arrangement which economically provides the highest field strength on the axis with the minimum beam half width and a minimum outer field strength of the coil winding comprises two tubular shielding cylinder means of superconductive material coaxially aligned with the lens axis, said cylinder means each having a first end and a second end, said first ends being spaced from each other to define a unshielded lens gap therebetween, said lens gap having a coil means positioned about the cylinder means to create a magnetic field, a cooling agent adapted to be present about the cylinder which cause a concentration of the magnetic field adjacent the particle beam, and a ferromagnetic ring-shaped pole shoe on each of said first ends of said cylinders for regulating and guiding the magnetic field.
    • 一种高度紧凑的磁透镜装置,其经济地在轴上提供最高的场强,具有最小的光束半宽度和线圈绕组的最小外场强度,包括两个与透镜轴同轴对准的超导材料的管状屏蔽筒装置,所述圆筒 每个具有第一端和第二端的装置,所述第一端彼此间隔开以限定其间的非屏蔽透镜间隙,所述透镜间隙具有围绕所述气缸装置定位的线圈装置以产生磁场,冷却剂适于 围绕气缸存在,其导致与粒子束相邻的磁场的浓度;以及在所述气缸的每个所述第一端上的铁磁环形极靴,用于调节和引导磁场。