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Title: Electron emitting filaments for electron discharge devices

Abstract

Electrons are copiously emitted by a device comprising a loop-shaped filament made of lanthanum hexaboride. The filament is directly heated by an electrical current produced along the filament by a power supply connected to the terminal legs of the filament. To produce a filament, a diamond saw or the like is used to cut a slice from a bar made of lanthanum hexaboride. The diamond saw is then used to cut the slice into the shape of a loop which may be generally rectangular, U-shaped, hairpin-shaped, zigzag-shaped, or generally circular. The filaments provide high electron emission at a relatively low operating temperature, such as 1600/sup 0/C. To achieve uniform heating, the filament is formed with a cross section which is tapered between the opposite ends of the filament to compensate for nonuniform current distribution along the filament due to the emission of electrons from the filament.

Inventors:
; ;
Issue Date:
OSTI Identifier:
6969013
Application Number:
ON: DE84011098
Assignee:
Dept. of Energy ERA-09-026755; EDB-84-085129
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 43 PARTICLE ACCELERATORS; ELECTRON EMISSION; FILAMENTS; ELECTRIC DISCHARGES; FABRICATION; HEATING; ION SOURCES; EMISSION; 420800* - Engineering- Electronic Circuits & Devices- (-1989); 430301 - Particle Accelerators- Ion Sources

Citation Formats

Leung, K.N., Pincosy, P.A., and Ehlers, K.W. Electron emitting filaments for electron discharge devices. United States: N. p., 1983. Web.
Leung, K.N., Pincosy, P.A., & Ehlers, K.W. Electron emitting filaments for electron discharge devices. United States.
Leung, K.N., Pincosy, P.A., and Ehlers, K.W. Fri . "Electron emitting filaments for electron discharge devices". United States.
@article{osti_6969013,
title = {Electron emitting filaments for electron discharge devices},
author = {Leung, K.N. and Pincosy, P.A. and Ehlers, K.W.},
abstractNote = {Electrons are copiously emitted by a device comprising a loop-shaped filament made of lanthanum hexaboride. The filament is directly heated by an electrical current produced along the filament by a power supply connected to the terminal legs of the filament. To produce a filament, a diamond saw or the like is used to cut a slice from a bar made of lanthanum hexaboride. The diamond saw is then used to cut the slice into the shape of a loop which may be generally rectangular, U-shaped, hairpin-shaped, zigzag-shaped, or generally circular. The filaments provide high electron emission at a relatively low operating temperature, such as 1600/sup 0/C. To achieve uniform heating, the filament is formed with a cross section which is tapered between the opposite ends of the filament to compensate for nonuniform current distribution along the filament due to the emission of electrons from the filament.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {6}
}