Miniature x-ray source with improved output stability and voltage standoff
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United States of America Patent
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Jun 26, 2007
Grant Date -
Sep 29, 2005
app pub date -
Mar 23, 2005
filing date -
Mar 23, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An x-ray source includes an insulating tube having a cylindrical inside surface defining a cylindrical vacuum cavity, a cathode located near a first end of the insulating tube and adapted to be optically heated for emitting electrons, an anode adapted for a voltage bias with respect to the cathode for accelerating electrons emitted from the cathode, an x-ray emitter target located near a second end of the insulating tube for impact by accelerated electrons, and a secondary emission reduction layer covering at least a portion of the inside surface and adapted to minimize charge build-up on the inside surface, wherein the insulating tube is adapted to be weakly conductive to support a uniform voltage gradient along the insulating tube and across the voltage bias between the cathode and the anode.
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