Penning ion source

Penning ion source

[′pen·iŋ ′ī‚än ‚sȯrs]
(nucleonics)
A source of positively charged heavy ions used in accelerators, consisting of an anode chamber with cathodes at each end, into which the desired element is introduced; an arc discharge is generated in the chamber, creating a plasma, and electrons confined by the cathodes and an axial magnetic field make many ionizing collisions with the gas in the chamber.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.