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Sintered wire cesium dispenser photocathode

United States Patent

March 4, 2014
View the Complete Patent at the US Patent & Trademark Office
A photoelectric cathode has a work function lowering material such as cesium placed into an enclosure which couples a thermal energy from a heater to the work function lowering material. The enclosure directs the work function lowering material in vapor form through a low diffusion layer, through a free space layer, and through a uniform porosity layer, one side of which also forms a photoelectric cathode surface. The low diffusion layer may be formed from sintered powdered metal, such as tungsten, and the uniform porosity layer may be formed from wires which are sintered together to form pores between the wires which are continuous from the a back surface to a front surface which is also the photoelectric surface.
Montgomery; Eric J. (Dayton, MD), Ives; R. Lawrence (San Mateo, CA), Falce; Louis R. (Surprise, AZ)
Calabazas Creek Research, Inc. (San Mateo, CA), University of Maryland (College Park, MD)
13/ 587,200
August 16, 2012
The present invention was developed under the United States Department of Energy grant #DE-SC0006208. The government has certain rights in the invention.