Field free, directly heated lanthanum boride cathode
Abstract
A directly heated cylindrical lanthanum boride cathode assembly is disclosed which minimizes generation of magnetic fields which would interfere with electron emission from the cathode. The cathode assembly comprises a lanthanum boride cylinder in electrical contact at one end with a central support shaft which functions as one electrode to carry current to the lanthanum boride cylinder and in electrical contact, at its opposite end with a second electrode which is coaxially position around the central support shaft so that magnetic fields generated by heater current flowing in one direction through the central support shaft are cancelled by an opposite magnetic field generated by current flowing through the lanthanum boride cylinder and the coaxial electrode in a direction opposite to the current flow in the central shaft.
- Inventors:
-
- Hercules, CA
- San Francisco, CA
- Pleasant Hill, CA
- Issue Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- OSTI Identifier:
- 867715
- Patent Number(s):
- 4994706
- 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
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- field; free; directly; heated; lanthanum; boride; cathode; cylindrical; assembly; disclosed; minimizes; generation; magnetic; fields; interfere; electron; emission; comprises; cylinder; electrical; contact; central; support; shaft; functions; electrode; carry; current; opposite; coaxially; position; generated; heater; flowing; direction; cancelled; coaxial; flow; central support; lanthanum boride; support shaft; assembly comprises; electron emission; electrical contact; magnetic field; magnetic fields; current flow; current flowing; direction opposite; field generated; cathode assembly; directly heated; central shaft; coaxial electrode; heated lanthanum; fields generated; field free; coaxially position; boride cathode; /313/
Citation Formats
Leung, Ka-Ngo, Moussa, David, and Wilde, Stephen B. Field free, directly heated lanthanum boride cathode. United States: N. p., 1991.
Web.
Leung, Ka-Ngo, Moussa, David, & Wilde, Stephen B. Field free, directly heated lanthanum boride cathode. United States.
Leung, Ka-Ngo, Moussa, David, and Wilde, Stephen B. Tue .
"Field free, directly heated lanthanum boride cathode". United States. https://www.osti.gov/servlets/purl/867715.
@article{osti_867715,
title = {Field free, directly heated lanthanum boride cathode},
author = {Leung, Ka-Ngo and Moussa, David and Wilde, Stephen B},
abstractNote = {A directly heated cylindrical lanthanum boride cathode assembly is disclosed which minimizes generation of magnetic fields which would interfere with electron emission from the cathode. The cathode assembly comprises a lanthanum boride cylinder in electrical contact at one end with a central support shaft which functions as one electrode to carry current to the lanthanum boride cylinder and in electrical contact, at its opposite end with a second electrode which is coaxially position around the central support shaft so that magnetic fields generated by heater current flowing in one direction through the central support shaft are cancelled by an opposite magnetic field generated by current flowing through the lanthanum boride cylinder and the coaxial electrode in a direction opposite to the current flow in the central shaft.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}