| 摘要 |
PCT No. PCT/JP78/00018 Sec. 371 Date Jul. 8, 1979 Sec. 102(e) Date Jun. 25, 1979 PCT Filed Nov. 2, 1978 PCT Pub. No. WO79/00281 PCT Pub. Date May 31, 1979.A cesium beam tube for use as a frequency standard, wherein the beam path from the cesium beam source unit to the detector is hermetically sealed. This cesium beam tube includes a rigid high frequency transition part composed of a metallic block which is used as the basic support of the tube. A first state selection magnet part and the cesium beam generator are coaxially coupled to the one end of the rigid cavity, while the second state selection magnet part and detector are coaxially connected to the other end of the rigid cavity. The rigid cavity, first and second magnet poles, cesium beam generator and the detector form the vacuum envelope by themselves, and the permanent magnets and other related parts are not in a vacuum.
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