Spherical aberration correction with threefold symmetric line currents

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...

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Veröffentlicht in:	Ultramicroscopy 2016-02, Vol.161, p.74-82
Hauptverfasser:	Hoque, Shahedul, Ito, Hiroyuki, Nishi, Ryuji, Takaoka, Akio, Munro, Eric
Format:	Artikel
Sprache:	eng
Schlagworte:	Aberration Aberration correction Beams (radiation) Hexapole corrector Line current Magnetic fields Magnetic lenses Magnetic multipole N-fold symmetric line current Optimization Sextupole corrector Spherical aberration Symmetry Wire
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