کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8037968 | 1518318 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spherical aberration correction with threefold symmetric line currents
ترجمه فارسی عنوان
اصلاح آبراه کروی با جریان خط متقارن سه گانه
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
چکیده انگلیسی
It has been shown that N-fold symmetric line current (henceforth denoted as N-SYLC) produces 2N-pole magnetic fields. In this paper, a threefold symmetric line current (N3-SYLC in short) is proposed for correcting 3rd order spherical aberration of round lenses. N3-SYLC can be realized without using magnetic materials, which makes it free of the problems of hysteresis, inhomogeneity and saturation. We investigate theoretically the basic properties of an N3-SYLC configuration which can in principle be realized by simple wires. By optimizing the parameters of a system with beam energy of 5.5Â keV, the required excitation current for correcting 3rd order spherical aberration coefficient of 400Â mm is less than 1AT, and the residual higher order aberrations can be kept sufficiently small to obtain beam size of less than 1Â nm for initial slopes up to 5Â mrad.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultramicroscopy - Volume 161, February 2016, Pages 74-82
Journal: Ultramicroscopy - Volume 161, February 2016, Pages 74-82
نویسندگان
Shahedul Hoque, Hiroyuki Ito, Ryuji Nishi, Akio Takaoka, Eric Munro,