Thoriated tungsten hairpin-filament electron source for high- brightness applications

Journal Article · Fri Jul 01 04:00:00 EDT 1977 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1135122· OSTI ID:7142375

Murray, R G; Collier, R J

A carburized 2% thoriated tungsten hairpin-filament electron source, 0.125 mm in diameter, which operates at 10 kV with a brightness level of 5 x 10/sup 4/ A cm/sup -2/ sr/sup -1/ and has a rated life time of >700 h is described. The operating temperature of approx.1900 K (optical) is about 800 K below that of plain tungsten for the same brightness, and accounts for the order-of-magnitude increase in life. Methods for obtaining the required vacuum environment and carrying out the carburization are discussed.

• Research Organization: Bell Telephone Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 7142375
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 48:7; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACTINIDE ALLOYS
ALLOYS
ELECTRON MICROSCOPY
ELECTRON SOURCES
ELEMENTS
FILAMENTS
METALS
MICROSCOPY
OPERATION
PARTICLE SOURCES
RADIATION SOURCES
REFRACTORY METALS
THORIUM ADDITIONS
THORIUM ALLOYS
TRANSITION ELEMENTS
TUNGSTEN