Industrial electric heating furnaces – Electron beam furnace device – With plural beam devices
Patent
1989-03-27
1990-01-02
Envall, Jr., Roy N.
Industrial electric heating furnaces
Electron beam furnace device
With plural beam devices
H01J 37305
Patent
active
048918210
ABSTRACT:
A plurality of electron gun assemblies having transverse magnetic fields to focus an electron beam into a crucible to vaporize a material may be closely placed in parallel by inserting between the assemblies a thin magnetic fence magnetized across its surfaces. The polarity of a fence surface is the same as the polarity of the adjacent sidewall magnet forming the transverse field so that the opposition will prevent magnetic flux from passing between adjacent assemblies and a resulting distortion and defocusing of the electron beam.
REFERENCES:
patent: 3170019 (1965-02-01), Hanks
patent: 3270233 (1966-08-01), Dietrich
Castle Linval B.
Envall Jr. Roy N.
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