Field free, directly heated lanthanum boride cathode

Patent · Mon Feb 02 04:00:00 EST 1987

OSTI ID:7042634

Leung, Ka-Ngo; Moussa, D; Wilde, S B

A directly heated cylindrical lanthanum boride cathode assembly is disclosed which minimizes generation of magnetic field 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 cancelled 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.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• Assignee: LBNL; EDB-88-179180
• Patent Number(s): PATENTS-US-A6010053
• OSTI ID: 7042634
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430301* -- Particle Accelerators-- Ion Sources
BORIDES
BORON COMPOUNDS
CATHODES
DESIGN
ELECTRODES
ELECTRON EMISSION
EMISSION
INVENTIONS
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
MAGNETIC FIELDS
MAGNETIC SHIELDING
RARE EARTH COMPOUNDS
SHIELDING