Abstract
The description is given of an electrostatic focusing system by which electrons emitted from the tip of a hairpin filament are reunited at a distance of 2 to 3 cm. No intermediate potentials are required. An X-ray method is used for the experimental investigation of its properties. The electron spot is a reduced image of the tip of the filament and has a diameter of about 40 μ. On the basis of this system, a fine focus X-ray tube is designed, with a peak specific target loading of about 11 kw/mm2. Some performance data are given.
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