immersion electron lens

immersion electron lens

[i¦mər·zhən i′lk‚trän ‚lenz]
(electronics)
An electron lens in which the object, usually the cathode, lies deep within the electric field so that the index of refraction varies rapidly in its vicinity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.