Lanthanum hexaboride tapered filament in a plasma source

Journal Article · Wed May 01 00:00:00 EDT 1985 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138198· OSTI ID:5733741

Pincosy, P A; Leung, K N

A directly heated lanthanum hexaboride tapered filament has been tested in a plasma generator. A uniform temperature distribution at 1820 K has been achieved. The heating and cooling power calculated from measured quantities are balanced. A maximum arc current of 80 A was obtained, limited only by the power supply and plasma generator. The corresponding hydrogen ion current density was 0.6 A/cm/sup 2/ when the arc voltage was 80 V and the filament heater current was about 5 A. The filament was capable of emitting 100 A of current at an operating temperature of 1900 K. The estimated lifetime for this filament is 900 h.

• Research Organization: Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5733741
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 56:5; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700106* -- Fusion Energy-- Plasma Research-- Plasma Production-- (-1987)
BEAM CURRENTS
BEAMS
BORIDES
BORON COMPOUNDS
COOLING
CURRENTS
ELECTRIC ARCS
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRON EMISSION
EMISSION
FABRICATION
HEATING
HYDROGEN 1 MINUS BEAMS
ION BEAMS
ION SOURCES
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
PLASMA FILAMENT
PLASMA GUNS
RARE EARTH COMPOUNDS