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    • 9. 发明专利
    • Corrector for axial and off-axial beam paths
    • 轴向和离轴光束校正器
    • JP2009140924A
    • 2009-06-25
    • JP2008297643
    • 2008-11-21
    • Ceos Corrected Electron Optical Systems Gmbhツェーエーオーエス コレクテッド エレクトロン オプチカル システムズ ゲーエムベーハーCEOS Corrected Electron Optical Systems GmbH
    • ZACH JOACHIMROSE HARALD
    • H01J37/153
    • H01J37/153H01J37/26H01J2237/1534
    • PROBLEM TO BE SOLVED: To eliminate the astigmatism of third-order without introducing disturbing aberrations of higher-order. SOLUTION: The present invention relates to a corrector for the axial and off-axial beam paths of a particle-optical system. The corrector includes a first and a second correction piece, which are disposed one behind the other in the beam path on an optical axis. Each correction piece includes four successive multipole elements disposed symmetrically with respect to a center plane and with the following fields. The first and the fourth multipole elements of the multipole elements are used to generate quadrupole fields and the second and third are used to generate octupole fields and quadrupole fields, wherein the latter are superposed magnetic and electric fields, wherein the quadrupole fields of all four multipole elements are rotated from one to the next through 90°. An astigmatism of third-order is corrected by a central multipole element disposed in the center plane and generating an octupole field. COPYRIGHT: (C)2009,JPO&INPIT
    • 要解决的问题:消除三阶散光,不引入高阶干扰像差。 解决方案:本发明涉及一种用于粒子 - 光学系统的轴向和离轴光束路径的校正器。 校正器包括第一和第二校正片,其在光轴上在光束路径中一个接一个地设置。 每个校正件包括四个连续的多极元件,其相对于中心平面和随后的场对称设置。 多极元件的第一和第四多极元件用于产生四极场,第二和第三多极元件用于产生八极场和四极场,其中后者是叠加的磁场和电场,其中所有四个多极的四极场 元件从一个到另一个旋转90°。 通过设置在中心平面中的中心多极元件来校正三阶散光并产生八极场。 版权所有(C)2009,JPO&INPIT