Title: Vacuum-tight window structure for the passage of x-rays and similar penetrating radiation

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Abstract: A window structure having a vacuum-tight seal provided by a pressure fit between a tubular frame section and a tubular window flange section both having their edges directed toward the exterior side of the window structure. A further ring is disclosed as being press fit at the inner side of the window flange section, the frame section having a smaller thermal coefficient of expansion than the window flange section and being disclosed as having a circumferential bead interlocked with a receiving groove in the window flange section of radial dimension such that the window member can be removed from the frame section by heating the frame section to a high temperature while applying a cooling fluid to the material of the window flange section. The coefficients of thermal expansion of the tubular frame section and of the inner ring are such that the gap formed between these two sections remains approximately the same or is reduced during heating, while the window flange section having a greater thermal coefficient of expansion, is pressed with very high pressure against the interior surface of the frame section during heating about its entire circumference simultaneously and uniformly, so that thermal or mechanical forces occur uniformly with no risk of distortion or warpage. Interiorly of the mechanical seal the window structure is entirely free of agents such as solder or adhesive which are a souce of contaminating gas molecules and would shorten the useful life of the tube.


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