Negative ion beam injection apparatus with magnetic shield and e

Details Negative ion beam injection apparatus with magnetic shield and e Negative ion beam injection apparatus with magnetic shield and e

1992-04-29

1994-11-15

Berman, Jack I.

Radiant energy

Ion generation

Field ionization type

250424, 3133601, H01J 2702

Patent

active

053650700

ABSTRACT:
A negative ion source is constructed to produce H.sup.- ions without using Cesium. A high percentage of secondary electrons that typically accompany the extracted H.sup.- are trapped and eliminated from the beam by permanent magnets in the initial stage of acceleration. Penetration of the magnetic field from the permanent magnets into the ion source is minimized. This reduces the destructive effect the magnetic field could have on negative ion production and extraction from the source. A beam expansion section in the extractor results in a strongly converged final beam.

REFERENCES:
patent: 3648015 (1972-03-01), Fairbairn
patent: 3663360 (1972-05-01), Post
patent: 4172008 (1979-10-01), Fleet
patent: 4390494 (1983-06-01), Salisbury
patent: 4486665 (1984-12-01), Leung et al.
patent: 4739214 (1988-04-01), Barr
patent: 4931640 (1990-06-01), Marshall et al.
patent: 4933551 (1990-06-01), Bernuis et al.
patent: 5198677 (1993-03-01), Leung et al.

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