High-current density, high-brightness electron beams from large-area lanthanum hexaboride cathodes. Memorandum report
Technical Report
·
OSTI ID:5414909
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
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Related Subjects
43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
BEAMS
BORIDES
BORON COMPOUNDS
BRIGHTNESS
CATHODES
CURRENT DENSITY
ELECTRODES
ELECTRON BEAMS
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY
FREE ELECTRON LASERS
HEAT
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
LASERS
LEPTON BEAMS
METALS
OPTICAL PROPERTIES
OSMIUM
PARTICLE BEAMS
PHYSICAL PROPERTIES
PLATINUM METALS
RARE EARTH COMPOUNDS
THERMIONIC EMISSION
TRANSITION ELEMENTS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
BEAMS
BORIDES
BORON COMPOUNDS
BRIGHTNESS
CATHODES
CURRENT DENSITY
ELECTRODES
ELECTRON BEAMS
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY
FREE ELECTRON LASERS
HEAT
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
LASERS
LEPTON BEAMS
METALS
OPTICAL PROPERTIES
OSMIUM
PARTICLE BEAMS
PHYSICAL PROPERTIES
PLATINUM METALS
RARE EARTH COMPOUNDS
THERMIONIC EMISSION
TRANSITION ELEMENTS