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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 (10) is disclosed. The system comprises a LaB.sub.6 cathode element (11) generally circular in shape about a central axis. The cathode element (11) has a head (21) with an upper substantially planar emission surface (23), and a lower downwardly and an intermediate body portion (26) which diminishes in cross-section from the head (21) towards the base (22) of the cathode element (11). A central rod (14) is connected to the base (22) of the cathode element (11) and extends along the central axis. Plural upstanding spring fingers (37) are urged against an outer peripheral contact surface (24) of the head end (21) to provide a mechanical and electrical connection to the cathode element (11).

Inventors:
 [1];  [2];  [3];  [4];  [4];  [5];  [6];  [7]
  1. (Hercules, CA)
  2. (Berkeley, CA)
  3. (Castro Valley, CA)
  4. (San Francisco, CA)
  5. (Danville, CA)
  6. (Pleasant Hill, CA)
  7. (Albany, CA)
Issue Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
OSTI Identifier:
866811
Patent Number(s):
4795940
Assignee:
United States of America as represented by United States (Washington, DC) LBNL
DOE Contract Number:  
AC03-87SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
directly; heated; lanthanum; hexaboride; cathode; structure; predetermined; emission; profile; lab; 10; disclosed; comprises; element; 11; circular; shape; central; axis; head; 21; upper; substantially; planar; surface; 23; downwardly; intermediate; portion; 26; diminishes; cross-section; towards; base; 22; rod; 14; connected; extends; plural; upstanding; spring; fingers; 37; urged; outer; peripheral; contact; 24; provide; mechanical; electrical; connection; substantially planar; cathode structure; cathode element; contact surface; central axis; electrical connection; lanthanum hexaboride; outer peripheral; central rod; directly heated; heated lanthanum; hexaboride cathode; boride cathode; /313/

Citation Formats

Leung, Ka-Ngo, Gordon, Keith C., Kippenham, Dean O., Purgalis, Peter, Moussa, David, Williams, Malcom D., Wilde, Stephen B., and West, Mark W. Large area directly heated lanthanum hexaboride cathode structure having predetermined emission profile. United States: N. p., 1989. Web.
Leung, Ka-Ngo, Gordon, Keith C., Kippenham, Dean O., Purgalis, Peter, Moussa, David, Williams, Malcom D., Wilde, Stephen B., & West, Mark W. Large area directly heated lanthanum hexaboride cathode structure having predetermined emission profile. United States.
Leung, Ka-Ngo, Gordon, Keith C., Kippenham, Dean O., Purgalis, Peter, Moussa, David, Williams, Malcom D., Wilde, Stephen B., and West, Mark W. Sun . "Large area directly heated lanthanum hexaboride cathode structure having predetermined emission profile". United States. https://www.osti.gov/servlets/purl/866811.
@article{osti_866811,
title = {Large area directly heated lanthanum hexaboride cathode structure having predetermined emission profile},
author = {Leung, Ka-Ngo and Gordon, Keith C. and Kippenham, Dean O. and Purgalis, Peter and Moussa, David and Williams, Malcom D. and Wilde, Stephen B. and West, Mark W.},
abstractNote = {A large area directly heated lanthanum hexaboride (LaB.sub.6) cathode system (10) is disclosed. The system comprises a LaB.sub.6 cathode element (11) generally circular in shape about a central axis. The cathode element (11) has a head (21) with an upper substantially planar emission surface (23), and a lower downwardly and an intermediate body portion (26) which diminishes in cross-section from the head (21) towards the base (22) of the cathode element (11). A central rod (14) is connected to the base (22) of the cathode element (11) and extends along the central axis. Plural upstanding spring fingers (37) are urged against an outer peripheral contact surface (24) of the head end (21) to provide a mechanical and electrical connection to the cathode element (11).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

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