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Title: Large area directly heated lanthanum hexaboride cathode structure having predetermined emission profile

Abstract

A large area directly heated lanthanum hexaboride (LaB/sub 6/) cathode system is disclosed. The system comprises a LaB/sub 6/ cathode element generally circular in shape about a central axis. The cathode element has a head with an upper substantially planar emission surface, and a lower downwardly and an intermediate body portion which diminishes in cross-section from the head towards the base of the cathode element. A central rod is connected to the base of the cathode element and extends along the central axis. Plural upstanding spring fingers are urged against an outer peripheral contact surface of the head end to provide a mechanical and electrical connection to the cathode element. 7 figs

Inventors:
; ; ; ; ; ; ;
Issue Date:
Research Org.:
Lawrence Berkeley Lab., CA (USA)
OSTI Identifier:
6682795
Patent Number(s):
-US-A6108327
Application Number:
ON: DE89000184
Assignee:
LBNL; ERA-14-003724; EDB-88-195598
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:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; CATHODES; DESIGN; LANTHANUM BORIDES; SURFACE AREA; CHEMICAL PROPERTIES; ELECTRON EMISSION; INVENTIONS; PHYSICAL PROPERTIES; THERMIONIC EMITTERS; BORIDES; BORON COMPOUNDS; ELECTRODES; EMISSION; LANTHANUM COMPOUNDS; RARE EARTH COMPOUNDS; SURFACE PROPERTIES 640301* -- Atomic, Molecular & Chemical Physics-- Beams & their Reactions; 360204 -- Ceramics, Cermets, & Refractories-- Physical Properties

Citation Formats

Leung, Ka-Ngo, Gordon, K.C., Kippenhan, D.O., Purgalis, P., Moussa, D., Williams, M.D., Wilde, S.B., and West, M.W. Large area directly heated lanthanum hexaboride cathode structure having predetermined emission profile. United States: N. p., 1987. Web.
Leung, Ka-Ngo, Gordon, K.C., Kippenhan, D.O., Purgalis, P., Moussa, D., Williams, M.D., Wilde, S.B., & West, M.W. Large area directly heated lanthanum hexaboride cathode structure having predetermined emission profile. United States.
Leung, Ka-Ngo, Gordon, K.C., Kippenhan, D.O., Purgalis, P., Moussa, D., Williams, M.D., Wilde, S.B., and West, M.W. Fri . "Large area directly heated lanthanum hexaboride cathode structure having predetermined emission profile". United States.
@article{osti_6682795,
title = {Large area directly heated lanthanum hexaboride cathode structure having predetermined emission profile},
author = {Leung, Ka-Ngo and Gordon, K.C. and Kippenhan, D.O. and Purgalis, P. and Moussa, D. and Williams, M.D. and Wilde, S.B. and West, M.W.},
abstractNote = {A large area directly heated lanthanum hexaboride (LaB/sub 6/) cathode system is disclosed. The system comprises a LaB/sub 6/ cathode element generally circular in shape about a central axis. The cathode element has a head with an upper substantially planar emission surface, and a lower downwardly and an intermediate body portion which diminishes in cross-section from the head towards the base of the cathode element. A central rod is connected to the base of the cathode element and extends along the central axis. Plural upstanding spring fingers are urged against an outer peripheral contact surface of the head end to provide a mechanical and electrical connection to the cathode element. 7 figs},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {10}
}