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 Lab., CA (USA)
• 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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BORIDES
BORON COMPOUNDS
CATHODES
CHEMICAL PROPERTIES
DESIGN
ELECTRODES
ELECTRON EMISSION
EMISSION
INVENTIONS
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SURFACE AREA
SURFACE PROPERTIES
THERMIONIC EMITTERS