Abstract
The existing theory of the discharge mechanism in the cold-cathode pulsed X-ray tube based on ionization of residual gas and plasma formation is reviewed and is shown to fail for a high-vacuum tube. A new theory is presented which is based on the production at the cathode of a vapour jet having a velocity of approximately 106 cm sec-1. This results in an expanding region of low voltage discharge, and leaves most of the applied voltage across a rapidly contracting vacuum region adjacent to the anode. It is shown that the tube current and voltage as functions of time and the X-ray pulse duration can be predicted from a knowledge of the voltage supply and tube parameters, and the results are verified experimentally.
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