X-ray source
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United States of America Patent
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Apr 26, 2005
Grant Date -
Aug 7, 2003
app pub date -
Jan 10, 2003
filing date -
Jul 22, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A compact X-ray source is disclosed, improving controllability and insulation from unwanted high voltage effects. In one aspect, an active variable conductance device (130, 330) connected in series with the cathode is used in a closed loop, feedback arrangement to control the cathode beam current; the current flowing through the device to the cathode being directly sensed and compared with a desired current level. The result of the comparison is used to control the conductance of the device, thereby directly influencing the cathode current. A second aspect provides an extension of a Faraday cage, whereby the secondary winding of a transformer used to supply power to components within the cage is shielded within a coaxial, tubular member connected to the cage and extending outwardly from it.
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