Closed drift ion source with improved magnetic field

Details Closed drift ion source with improved magnetic field Closed drift ion source with improved magnetic field

1996-10-23

1998-06-09

O'Shea, Sandra L.

Electric lamp and discharge devices

With positive or negative ion acceleration

Means for deflecting or focusing

3133621, 31511191, 31511141, H05H 102

Patent

active

057639892

ABSTRACT:
Closed-drift ion sources of the magnetic-layer and anode-layer types are shown and described, with both one-stage and two stage versions of the latter included. Specific improvements include the use of a magnetically permeable insert in the closed drift region together with an effectively single source of magnetic field to facilitate the generation of a well-defined and localized magnetic field while, at the same time, permitting the placement of that magnetic field source at a location well removed from the hot discharge region. Such a configuration is also well suited to the use of a permanent magnet as the magnetic field source. In one embodiment a baffle arrangement serves to distribute the ionizable gas uniformly circumferentially and decrease its pressure below the Paschen-law minimum before exposure to the anode potential.

REFERENCES:
patent: 3831052 (1974-08-01), Knechtli
patent: 4862032 (1989-08-01), Kaufman
patent: 5218271 (1993-06-01), Egorov
patent: 5359258 (1994-10-01), Arkhipov
patent: 5646476 (1997-07-01), Aston

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