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Vacuum encapsulated hermetically sealed diamond amplified cathode capsule and method for making same

United States Patent

8,922,107
December 30, 2014
View the Complete Patent at the US Patent & Trademark Office
Brookhaven National Laboratory - Visit the Office of Technology Commercialization and Partnerships Website
A vacuum encapsulated, hermetically sealed cathode capsule for generating an electron beam of secondary electrons, which generally includes a cathode element having a primary emission surface adapted to emit primary electrons, an annular insulating spacer, a diamond window element comprising a diamond material and having a secondary emission surface adapted to emit secondary electrons in response to primary electrons impinging on the diamond window element, a first cold-weld ring disposed between the cathode element and the annular insulating spacer and a second cold-weld ring disposed between the annular insulating spacer and the diamond window element. The cathode capsule is formed by a vacuum cold-weld process such that the first cold-weld ring forms a hermetical seal between the cathode element and the annular insulating spacer and the second cold-weld ring forms a hermetical seal between the annular spacer and the diamond window element whereby a vacuum encapsulated chamber is formed within the capsule.
Rao; Triveni (Shoreham, NY), Walsh; John (Sound Beach, NY), Gangone; Elizabeth (New Hyde Park, NY)
Brookhaven Science Associates, LLC (Upton, NY)
14/ 115,534
20140117837
May 9, 2012
STATEMENT OF GOVERNMENT LICENSE RIGHTS This invention was made with Government support under contract number DE-AC02-98CH10886, awarded by the U.S. Department of Energy. The Government has certain rights in the invention.