OVEN STRUCTURE OF ATOM BEAM TUBE

摘要

PURPOSE:To prevent any breakage of a glass ampoule which might be caused due to thermal stress, and enable the glass ampoule to be used as a metal charging ampoule by providing an ampoule-protection network member around the glass ampoule. CONSTITUTION:A lid member 9 is brazed to the upper end of an outer cylinder 8 of an cylindrical oven. An ampoule base 12 made of copper or the like which has a high heat transfer rate is fixed to the lower part of the lid member 9, so that the lower end of the base 12 supports a glass ampoule 13 at a given position. Besides, the base 12 presses and supports the ampoule 13 from above when the sealing of the ampoule 13 is broken by pressing the bottom of the ampoule 13 by means of a pressing member 16. A network 14 prepared by weaving a metallic wire member made of Ni or the like is provided around the ampoule 13 so that the entire surface of the ampoule 13 except its top part and central bottom part is covered with the network 14. Owing to the above structure, any breakage of the ampoule 13 which might be caused due to thermal stress can be prevented.