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
- 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 = {Fri Jun 10 00:00:00 EDT 1983},
month = {Fri Jun 10 00:00:00 EDT 1983}
}