High duty-cycle x-ray tube
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United States of America Patent
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Apr 14, 1992
Issued Date -
N/A
app pub date -
Feb 1, 1991
filing date -
Nov 23, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rotating x-ray tube includes an electron-beam accelerator assembly having an indirectly heated cathode structure. The cathode structure includes an electron-emitting region mounted at the center of a rotationally symmetric Pierce-cathode configuration. An electron beam travels along a selected path as the tube rotates so that the electron beam strikes selected portions of a target mounted within the tube as it rotates. Two magnetic coils and a ferromagnetic mirror plate are arranged to function as a single quadrupole electromagnet, which has its axis parallel to and offset from the electron beam and which elongates the electron beam in a radial direction.
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