Field free, directly heated lanthanum boride cathode

Patent · Tue Feb 19 04:00:00 EST 1991

OSTI ID:5899797

Leung, K N; Moussa, D; Wilde, S B

This patent describes a directly heated cylindrical lanthanum boride cathode assembly disclosed which minimizes generation of magnetic fields which would interfere with electron emission from the cathode. The cathode assembly comprises a lanthanum boride cylinder in electrical contact at one end with a central support shaft which functions as one electrode to carry current to the lanthanum boride cylinder and in electrical contact, at its opposite end with a second electrode which is coaxially position around the central support shaft so that magnetic fields generated by heater current flowing in one direction through the central support shaft are canceled by an opposite magnetic field generated by current flowing through the lanthanum boride cylinder and the coaxial electrode in a direction opposite to the current flow in the central shaft.

• Assignee: Dept. of Energy, Washington, DC (USA)
• Patent Number(s): US 4994706; A
• Application Number: PPN: US 7-010053
• OSTI ID: 5899797
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
661220 -- Particle Beam Production & Handling
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BORIDES
BORON COMPOUNDS
CATHODES
ELECTRODES
ELECTRON EMISSION
EMISSION
HEATING
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
MATERIALS TESTING
PLASMA HEATING
PLASMA PRODUCTION
RARE EARTH COMPOUNDS
TESTING
THERMIONIC EMISSION
Ta
Targets-- (1992-)