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US 2010/0150315 A1Published application
X-ray source
AssigneePanaltyical B.V.
InventorsBart Filmer, Maurice Lambers
Life of this patent
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Abstract
An X-ray source with a cathode (2) that includes a first wire (4) having optionally thermal loops (12, 14) between an emission loop (10) and first and second ends (6, 8). A spiral second wire (30) is wound around the wire (4) and a low work function coating (32) is provided on both wires. The first and second wires may be of refractory material, such as tungsten, and the low work function coating may include barium oxide.
Claims10
An X-ray source comprising:
- an anode;
- a cathode having an emission loop surrounding the anode;
- and
- wherein the cathode includes:
- a first wire of refractory metal extending between a first end and a second end;
- a spiral of a second wire of refractory metal extending around and covering the first wire at least over the length of the emission loop;
- and
- a coating covering the wires at least over the length of the emission loop, the coating having a work function below 4 eV;
- wherein the first wire of refractory metal includes a first thermal loop between the emission loop and the first end, and a second thermal loop between the emission loop and the second end, wherein each thermal loop provides a thermal resistance between the emission loop and the respective end.
6 more elements
Dependencies are inferred from the claim text.