Electric lamp and discharge devices – With temperature modifier – Hollow electrode or lead
Patent
1987-02-02
1991-02-19
Wieder, Kenneth
Electric lamp and discharge devices
With temperature modifier
Hollow electrode or lead
313 39, 31323101, 313346R, H01J 115, H01J 192
Patent
active
049947060
ABSTRACT:
A directly heated cylindrical lanthanum boride cathode assembly is 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 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.
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Rev. Sci. Instrum., 50(11), Nov. 1979, Ehlers et al, "Characteristics of the Berkeley multicusp ion source".
Rev. Sci. Instrum. 55(7), Jul. 1984, Leung et al, "Directly heated lanthanum hexaboride filaments".
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Rev. Sci. Instrum. 56(9), Sep. 1985, Goebel et al, "Large-area lanthanum hexaboride electron emitter".
Leung Ka-Ngo
Moussa David
Wilde Stephen B.
Carnahan L. E.
Gaither Roger S.
Moser William R.
The United States of America as represented by the United States
Wieder Kenneth
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