Cesium introduction device in neutral particle injector

摘要

PROBLEM TO BE SOLVED: To provide a cesium introduction device capable of measuring precisely the level of a magnet installed on a float bottom part, by floating stably a float on a cesium liquid level in a storage tank. SOLUTION: This cesium introduction device has such characteristics that a groove 7 passing through the end part of a pipe 17 for connecting a valve 2 to a storage tank 1 is formed on the inner wall of the storage tank 1 in the center axis direction of the storage tank 1, and that a hexagonal prism-shaped float 5A or a cylindrical float 5A having projections on the outside is enclosed in the storage tank 1 having a cylindrical inner part and a passage for cesium vapor is formed between the inner wall of the storage tank 1 and the float 5A, and that inclined surfaces are formed on the upper part and the bottom surface of the float 5A, and that an inclination equal to an angle formed between a center shaft of an ion source 4 and a horizontal plane is formed between the axis of the valve 2 and the pipe 17 and the axis of an introduction pipe 3, and that the float 5A is sealed. As the float 5A can be floated stably on cesium liquid in the storage tank 1, such an effect that the level of a magnet 6 installed on the bottom part of the float 5A can be measured precisely can be obtained.