Please use this identifier to cite or link to this item:
|Title:||Eddy current compensation for magnetic electron lenses|
|Authors:||Thong, J.T.L. |
|Citation:||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/10.1088/0957-0233/7/11/007|
|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|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Dec 12, 2018
WEB OF SCIENCETM
checked on Dec 5, 2018
checked on Dec 8, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.