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1. A cathode control multi-cathode distributed X-ray apparatus, characterised in that, comprising:
a vacuum box with the perimeter sealed and a high vacuum inside; a plurality of cathodes independent of each other and arranged as a linear array and mounted at one end inside the vacuum box, each cathode having a cathode filament, a cathode surface connected to the cathode filament and a filament lead drawn out from both ends of the cathode filament; a plurality of focal current limiters arranged as a linear array corresponding one by one to the cathodes and mounted at a position near the cathodes in the middle part inside the vacuum box, the focal current limiters being connected to one another; an anode made of metal and mounted at another end inside the vacuum box, being parallel to the focal current limiters in the length direction and forming an included angle of predetermined degrees with the focal current limiters in the width direction; a power supply and control system, having a cathode power supply, a focal current limiter power supply connected to the interconnected focal current limiters, an anode high voltage power supply, and a control apparatus for exercising comprehensive logical control over the respective power supplies; a pluggable high voltage connector, for connecting the anode to the anode high voltage power supply, and installed at the side face of one end of the vacuum box near the anode; and a plurality of pluggable cathode power supply connectors, for connecting the cathode to the cathode power supply, and installed at the side face of one end of the vacuum box near the cathode, wherein the focal current limiters comprise: an electric field isostatic surface made of metal and having a current limiting aperture in the center thereof; a focus electrode made of metal and in the shape of a cylinder, with its tip pointing right to a beam stream aperture of the cathode, the size of the current limiting aperture is less than or equal to a central aperture of the focus electrode. |
