Title
LSRH cesium beam (6 m)
Alternative Title
Résonateur à jet atomique de césium du LSRH (6 m)
Authors
Bonanomi, Jacques
LSRH
Kartaschoff, Peter
LSRH
Date of Issue
1960
Device Type
clock
Operating Principle
beam
Reference Species
cesium
Quantum Transition
(F=3,mF=0) <-> (F=4,mF=0)
Reference Frequency
9 192 631 770
Fabrication Source
noncommercial
Host Institution
LSRH
Status Timeline
Development: 1959-1960; Operational: 1960
Technical Design aspects: size, design etc.
Total length: 600 cm. Interaction length: 410 cm. Diameter of vacuum tank: 25 cm
Detector: “The beam is detected by a hot-tungsten-ribbon ionizer followed by a mass spectrometer system. The ion current is detected by a seventeen-stage electron-multiplier using Cu-Be dynodes” (“This multiplier is constructed by the applied physics department of the Swiss Federal Institute of Technology, Zurich.”) [3]
Modification History
The shielding of the C-field was changed in March 1962 [4]. For details on the shielding see also [3].
Usage History
Since June 1960, it served as “the basic [primary?] Swiss standard of frequency and time, through regular calibrations of the quartz clocks of the Neuchâtel Observatory” [1].
Identifiers
https://libra.unine.ch/handle/20.500.14713/99847