BEAM OPTICS OF THE RRL CESIUM BEAM PRIMARY FREQUENCY STANDARD

Koji Nakagiri, Haruo Okazawa, Shinji Urabe

Abstract:	The laboratory type cesium beam frequency standard, Cs 1, of RRL (Radio Research Laboratory) features a hexapole magnet focusing system, a 55 cm Ramsey cavity using a coaxial line-to-waveguide transducer and a digital servo system. The length of the Ramsey cavity is relatively short. Therefore, in order to secure a good signal-to-noise ratio, bean uniformity and, to decrease the pulling effect caused by the wings of neighboring field-dependent transitions, a calculation of the beam trajectory, using the Runge-Kutta method, was carried out. In the calculation, the following items were considered: 1) a beam collimator having a finite area instead of a point source, 21 dependence of the effective dipole moment on the position in the magnet, 3) motion of the atoms in the direction. After evaluating the equations, the technical advantage of the focusing system using the hexapole magnets became clear. The results of the calculation agreed fairly well with that of the experiment. This recent optimization of the bezun optics has probably improved the microwave power dependent frequency shift in the accuracy evaluation of RRL Cs 1.
Published in:	Proceedings of the 18th Annual Precise Time and Time Interval Systems and Applications Meeting December 2 - 4, 1986 DuPont Plaza Hotel Washington, DC
Pages:	503 - 513
Cite this article:	Nakagiri, Koji, Okazawa, Haruo, Urabe, Shinji, "BEAM OPTICS OF THE RRL CESIUM BEAM PRIMARY FREQUENCY STANDARD," Proceedings of the 18th Annual Precise Time and Time Interval Systems and Applications Meeting, Washington, DC, December 1986, pp. 503-513.
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