Please use this identifier to cite or link to this item: https://doi.org/11/007
Title: Eddy current compensation for magnetic electron lenses
Authors: Thong, J.T.L. 
Li, F.
Issue Date: Nov-1996
Source: Thong, J.T.L.,Li, F. (1996-11). Eddy current compensation for magnetic electron lenses. Measurement Science and Technology 7 (11) : 1583-1590. ScholarBank@NUS Repository. https://doi.org/11/007
Abstract: The decay of eddy currents in magnetic electron lenses poses a fundamental limit to their speed of operation. The effect of eddy currents on the focusing properties of an electron lens is considered and it is shown that response of the lens field to excitation can be well approximated as a linear system. Using Fourier transform techniques, the transfer function of the lens is derived from a mesurement of the peak axial field in response to step-like excitation from which the necessary excitation to achieve a specific transient response can be calculated. For practical implementation, the design of analogue pre-emphasis filters to improve the transient response of magnetic lenses is presented. The procedure involves approximating the step response of the lens field by exponential functions to derive the transfer function of the filter.
Source Title: Measurement Science and Technology
URI: http://scholarbank.nus.edu.sg/handle/10635/62084
ISSN: 09570233
DOI: 11/007
Appears in Collections:Staff Publications

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