periodic field focusing

periodic field focusing

[¦pir·ē¦äd·ik ′fēld ‚fō·kə·siŋ]

(electronics)

Focusing of an electron beam where the electrons follow a trochoidal path and the focusing field interacts with them at selected points.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.