electrostatic octupole lens

electrostatic octupole lens

[i′lek·trə‚stad·ik ¦äk·tə‚pōl ′lenz]
(electronics)
A device for controlling beams of electrons or other charged particles, consisting of eight electrodes arranged in a circular pattern with alternating polarities; commonly used to correct aberrations of quadrupole lens systems.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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