High-current density, high-brightness electron beams from large-area lanthanum hexaboride cathodes. Memorandum report

Technical Report · Sun Dec 13 00:00:00 EST 1987

OSTI ID:5414909

Loschialpo, P; Kapetanakos, C A

Large (approx. 5 cm) diameter lanthanum hexaboride (LaB/sub 6/) cathodes operated at 10 kV produced 1-5 micro electron pulses with current density between 10 and 20 A/sq. cm. Normalized beam brightness was consistently measured. To obtain this high current density, the LaB/sub 6/ cathodes have been heated to temperatures between approx 1600 to 1800 C. Very uniform temperature profiles are obtained by applying a carefully tailored electron-bombardment heating power distribution. These measurements have been made between pressure .000001 to .00001 Torr, i.e., under much less-demanding vacuum conditions than that required by conventional dispenser-type cathodes.

• Research Organization: Naval Research Lab., Washington, DC (USA)
• OSTI ID: 5414909
• Report Number(s): AD-A-187700/0/XAB; NRL-MR-6119
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ELECTRON BEAMS
BRIGHTNESS
CURRENT DENSITY
LANTHANUM BORIDES
CATHODES
ELECTRON EMISSION
FREE ELECTRON LASERS
HEAT
OSMIUM
THERMIONIC EMISSION
BEAMS
BORIDES
BORON COMPOUNDS
ELECTRODES
ELEMENTS
EMISSION
ENERGY
LANTHANUM COMPOUNDS
LASERS
LEPTON BEAMS
METALS
OPTICAL PROPERTIES
PARTICLE BEAMS
PHYSICAL PROPERTIES
PLATINUM METALS
RARE EARTH COMPOUNDS
TRANSITION ELEMENTS
430200* - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics