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Title: Field free, directly heated lanthanum boride cathode

Abstract

A directly heated cylindrical lanthanum boride cathode assembly is disclosed which minimizes generation of magnetic field 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:
; ;
Issue Date:
Research Org.:
Lawrence Berkeley Lab., CA (USA)
OSTI Identifier:
7042634
Patent Number(s):
-US-A6010053
Assignee:
LBNL; EDB-88-179180
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CATHODES; DESIGN; MAGNETIC FIELDS; MAGNETIC SHIELDING; ELECTRON EMISSION; INVENTIONS; LANTHANUM BORIDES; BORIDES; BORON COMPOUNDS; ELECTRODES; EMISSION; LANTHANUM COMPOUNDS; RARE EARTH COMPOUNDS; SHIELDING; 430301* - Particle Accelerators- Ion Sources

Citation Formats

Leung, Ka-Ngo, Moussa, D., and Wilde, S.B. Field free, directly heated lanthanum boride cathode. United States: N. p., 1987. Web.
Leung, Ka-Ngo, Moussa, D., & Wilde, S.B. Field free, directly heated lanthanum boride cathode. United States.
Leung, Ka-Ngo, Moussa, D., and Wilde, S.B. Mon . "Field free, directly heated lanthanum boride cathode". United States.
@article{osti_7042634,
title = {Field free, directly heated lanthanum boride cathode},
author = {Leung, Ka-Ngo and Moussa, D. and Wilde, S.B.},
abstractNote = {A directly heated cylindrical lanthanum boride cathode assembly is disclosed which minimizes generation of magnetic field 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 = {1987},
month = {2}
}