| 摘要 |
An ion source is provided that is constructed for use with a magnet that produces magnetic flux lines extending in a predetermined direction and a source of ionizable material for creating ion. The ion source includes a chamber, defined by walls, and a relatively narrow outlet aperture for ions produced in the chamber to leave the chamber. The chamber encloses a cathode and an anode spaced from the cathode and from the walls of the chamber. The anode is positioned with respect to the aperture, the cathode and the predetermined direction of the magnetic flux to cause ions produced in the chamber to drift in crossed magnetic and electric fields so as to concentrate near the aperture.
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