Abstract
An analytical model and equations for describing the field of a planar magnetic lens with two concentric nonmagnetic gaps are developed. It is demonstrated that the “half-width” of the magnetic field of the lens can be controlled by varying independently the currents in the excitation coils of the two gaps. This makes it possible to control the focal length and the spherical aberration of the lens. It is shown that when oppositely directed currents are used in the excitation coils, a planar magnetic lens that does not rotate the image can be obtained.
References
P. W. Hawkes (ed.), Magnetic Electron Lenses (Springer, West Berlin, 1982), pp. 359–412.
M. Szilgyi, Electron and Ion Optics (Plenum Press, New York, 1988) 639 pp.
A. B. Abraamyants, V. D. Gelever, and V. A. Zhukov, in Abstracts of the 14th All-Union Conference on Electron Microscopy [in Russian], USSR Academy of Sciences Press, Moscow, 1990, 286 pp.
W. Glaser, Grundlagen Electronenoptik (Springer-Verlag, Wien, 1952) 763 pp.
V. M. Smirnov, Course in Higher Mathematics, Vol. 2 [in Russian] (GITTL, Moscow, 1957) 628 pp.
Author information
Authors and Affiliations
Additional information
Zh. Tekh. Fiz. 69, 133–134 (August 1999)
Rights and permissions
About this article
Cite this article
Zhukov, V.A., Kotlikov, E.N. & Gelever, V.D. A double-gap planar magnetic lens. Tech. Phys. 44, 990–991 (1999). https://doi.org/10.1134/1.1259421
Received:
Issue Date:
DOI: https://doi.org/10.1134/1.1259421