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Meaning of drift tube

drift' tube"

Pronunciation: [key]
— Radio. Radio.
  1. a conducting enclosure, usually cylindrical, held at a constant potential so that electrons or charged particles within will experience no force, and therefore no change in velocity. Cf. Klystron (def. 1).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.