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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.degree. 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 non-uniform current distribution along the filament due to the emission of electrons from the filament.

Inventors:
 [1];  [2];  [3]
  1. Hercules, CA
  2. Oakland, CA
  3. Alamo, CA
Issue Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
866656
Patent Number(s):
4760306
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
electron; emitting; filaments; discharge; devices; electrons; copiously; emitted; device; comprising; loop-shaped; filament; lanthanum; hexaboride; directly; heated; electrical; current; produced; power; supply; connected; terminal; legs; produce; diamond; cut; slice; bar; shape; loop; rectangular; u-shaped; hairpin-shaped; zigzag-shaped; circular; provide; emission; relatively; operating; temperature; 1600; degree; achieve; uniform; heating; formed; section; tapered; opposite; compensate; non-uniform; distribution; due; current produced; electron emitting; electron discharge; uniform heating; electron emission; discharge device; power supply; electrical current; operating temperature; device comprising; lanthanum hexaboride; directly heated; form cu; current distribution; uniform heat; uniform current; discharge devices; /313/445/

Citation Formats

Leung, Ka-Ngo, Pincosy, Philip A, and Ehlers, Kenneth W. Electron emitting filaments for electron discharge devices. United States: N. p., 1988. Web.
Leung, Ka-Ngo, Pincosy, Philip A, & Ehlers, Kenneth W. Electron emitting filaments for electron discharge devices. United States.
Leung, Ka-Ngo, Pincosy, Philip A, and Ehlers, Kenneth W. Fri . "Electron emitting filaments for electron discharge devices". United States. https://www.osti.gov/servlets/purl/866656.
@article{osti_866656,
title = {Electron emitting filaments for electron discharge devices},
author = {Leung, Ka-Ngo and Pincosy, Philip A and Ehlers, Kenneth 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.degree. 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 non-uniform current distribution along the filament due to the emission of electrons from the filament.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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