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

Patent · Tue Dec 30 04:00:00 EST 2014

OSTI ID:1166751

Rao, Triveni; Walsh, John; Gangone, Elizabeth

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.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-98CH10886
• Assignee: Brookhaven Science Associates, LLC (Upton, NY)
• Patent Number(s): 8,922,107
• Application Number: 14/115,534
• OSTI ID: 1166751
• Country of Publication: United States
• Language: English

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