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

Patent · Fri Oct 16 00:00:00 EDT 1987

OSTI ID:6682795

Leung, Ka-Ngo; Gordon, K C; Kippenhan, D O; Purgalis, P; Moussa, D; Williams, M D; Wilde, S B; West, M W

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

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• DOE Contract Number: AC03-76SF00098
• Assignee: LBNL; ERA-14-003724; EDB-88-195598
• Patent Number(s): PATENTS-US-A6108327
• Application Number: ON: DE89000184
• OSTI ID: 6682795
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

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