Electron beam gun with grounded shield to prevent arc down

Details Electron beam gun with grounded shield to prevent arc down Electron beam gun with grounded shield to prevent arc down

1994-03-24

1995-08-22

Jeffery, John A.

Industrial electric heating furnaces

Electron beam furnace device

373 14, 373 11, 21912126, 392389, 118726, 313313, 313626, H01J 37305

Patent

active

RE0350249

ABSTRACT:
A grounded metallic shield which comprises an electrode enclosing the filament leads and emitters of an e-Gun in a high vacuum chamber of the type used in melting and casting metals and other materials and evaporation sources. The shield is spaced from the filament leads and emitters a distance in the order of the electron mean free path for the pressure uses within the high vacuum chamber. The structure and method of use thereof suppresses or eliminates arc-downs or glow discharges.

REFERENCES:
patent: 3008027 (1961-11-01), Beckius et al.
patent: 3286021 (1966-11-01), Koch
patent: 3486064 (1969-12-01), Stauffer
patent: 3678334 (1972-07-01), Dugdale et al.
patent: 3883679 (1975-05-01), Shrader et al.
patent: 4835789 (1989-05-01), Hanks
"The Book of Basics", Materials Research Corp. (unknown date), Orangeberg, N.Y. 10962 U.S.A., pp. B-I-8 thru B-I-10 and B-III-15, 16.

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