G - Physics
21
K
358/9
G21K 5/04 (2006.01)
Patent
CA 1066819
A B S T R A C T An atomic beam tube provides a single sealed envelope structure that serves both as vacuum envelope and as structural member to which the operative components are attached. The envelope is composed of a heavy and relatively rigid frame and a relatively thin and flexible cover sealed to the frame. The operative elements are separately assembled in independent sub- assembly units which are secured to the frame at a minimum of locations to provide fixed alignment and thermal isolation of the operative elements, and easy disassembly of the tube. The molecular beam tube apparatus comprises enclosure means, a source for providing a beam of molecular particles a first state selector for selecting a portion of the particles in the beam, a radio frequency transition section downstream from the first state selector for causing resonance transitions of some of the selected beam particles means for producing a weak generally homogeneous magnetic field in the radio frequency transition section, a second state selector downstream from said radio frequency transition section for selecting a further portion of the bean comprising these beam particles that have undergone resonance tran- sitions, and detecting means responsive to the particles in the further portion. The source and first state selector together comprise a first sub- assembly, the radio frequency transition section and the means for producing a weak field together comprise a second subassembly, and the second state selector and the detecting means together comprise a third subassembly. The enclosure means comprise a rigid base and a flexible cover, the frame and cover being sealed together to form a vacuum envelope. The three sub- assemblies are separately and removably secured to the frame.
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