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

Patent · Tue Jan 03 00:00:00 EST 1989

OSTI ID:6474067

Leung, K N; Gordon, K C; Kippenham, D O; Purgalis, P; Moussa, D; Williams, M D; Wilde, S B; West, M D

A directly heated lanthanum hexaboride cathode system is described. It consists of: a lanthanum hexaboride cathode element generally circular in shape about a central axis and having a head and base at opposite ends of a central axis, the head end having a generally planar emission surface extending radially from the axis and an outer peripheral contact surface, the cathode element having an integral, axially-elongated, tapered, intermediate body extending along the central axis between the head to the base, the intermediate body having a progressively diminishing cross-section from the head towards the base, a first electrical connector in conducting engagement with and peripherally around the contact surface on the head of the cathode element, a second electrical connector in conducting engagement with the base of the cathode element, means for establishing a flow of electrical current from one of the electrical connectors through the cathode element to the other of the electrical connectors.

• Assignee: Dept. of Energy, Washington, DC
• Patent Number(s): US 4795940
• OSTI ID: 6474067
• Resource Relation: Patent File Date: Filed date 14 Oct 1987
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
36 MATERIALS SCIENCE
CATHODES
DESIGN
LANTHANUM BORIDES
ELECTRICAL PROPERTIES
ELECTRIC CONTACTS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
EMISSION
HEATING
BORIDES
BORON COMPOUNDS
CURRENTS
ELECTRODES
EQUIPMENT
LANTHANUM COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
420800* - Engineering- Electronic Circuits & Devices- (-1989)
360204 - Ceramics
Cermets
& Refractories- Physical Properties