Electric lamp and discharge devices: systems – Discharge device load with fluent material supply to the... – Plasma generating
Patent
1979-03-19
1981-10-27
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Discharge device load with fluent material supply to the...
Plasma generating
31323131, 313339, 3133621, 31511181, H01J 120, H05H 124
Patent
active
042976154
ABSTRACT:
A lanthanum hexaboride element, typically of cylindrical configuration, is mounted within a high plasma density cathode enclosure. An inlet is provided to supply gas to the cathode enclosure in the vicinity of the lanthanum hexaboride cathode element, and the element is heated to electron-emitting temperature. A plasma utilization chamber is coupled to receive an electron or plasma stream from the cathode enclosure through an aperture of a suitable size to maintain a relatively high plasma density within the cathode enclosure. The plasma density within the cathode enclosure is preferably above the critical level required for high current emission from the lanthanum hexaboride cathode structure. For example this may be in the order of 3.5 times 10.sup.12 electrons per cubic centimeter for a current density of 10 amperes per square centimeter. The lanthanum hexaboride cathode element is supported on notched graphite rings, and the cathode enclosure is made of tungsten. Exceedingly high currents, of the order of 1000 amperes, and high current densities of the order of 5,000 amperes per square centimeter can be obtained from the exit aperture.
REFERENCES:
patent: 3440475 (1969-04-01), Schiller et al.
patent: 3515932 (1970-06-01), King
patent: 3798488 (1974-03-01), Pleshivtsev et al.
patent: 3928783 (1975-12-01), Hosoki et al.
patent: 4218633 (1980-08-01), Mirtich et al.
Lafferty, Boride Cathodes, Journal of Applied Physics, vol. 22, No. 3, Mar. 1951, pp. 299-309.
Wolski, Press Sintered Hevaboride Cathodes, U.N. Fellowship Studies, No. 69-12, Royal Inst. of Tech., Stockholm, Sweden, May 24, 1969.
Kohl, Handbook of Materials and Techniques for Vacuum Devices, Reinhold, N.Y., 1967, p. 502.
Crow James T.
Forrester A. Theodore
Goebel Dan M.
La Roche Eugene R.
The Regents of the University of California
LandOfFree
High current density cathode structure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High current density cathode structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High current density cathode structure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-281550