Title :
Progress towards a 133Cs-fountain as frequency standard in Brazil
Author :
Magalhaes, D.V. ; Santos, M.S. ; Bebeachibuli, A. ; Teles, F. ; Bagnato, V.S.
Author_Institution :
Inst. de Fisica de Sao Carlos, USP, Sao Carlos, Brazil
Abstract :
Recently, 133Cs atoms were trapped in a fountain chamber. About 108 cesium atoms are caught in a magneto-optical trap from a vapor cell at room temperature. The "future fountain" has a (1,1,1)-geometry for the laser cooling and launching operation. The difference between this configuration and the usual one concerns the polarization. The three upper beams have the same polarization, in opposition to the three lower ones. The interrogation and preparation cavities were also constructed as well as characterized concerning the temperature tunability in vacuum. The interrogation cavity is made of copper and the quality factor is about 8000. The microwave synthesizer was constructed in collaboration with BNM-SYRTE time and frequency group. The synthesizer was compared to a very stable oscillator at BNM-SYRTE resulting in a short term stability of 9.7×10-14τ-12/.
Keywords :
Q-factor; atomic clocks; caesium; frequency standards; frequency synthesizers; laser cooling; magneto-optical effects; microwave oscillators; particle traps; time of flight spectra; 293 to 298 K; BNM-SYRTE time; Brazil; Cs; Cs fountain chamber; interrogation cavity; laser cooling; magneto-optical trap; microwave synthesizer; polarization; quality factor; room temperature; short term stability; stable oscillator; vapor cell; Atomic beams; Collaboration; Cooling; Copper; Frequency synthesizers; Laser beams; Microwave oscillators; Polarization; Q factor; Temperature;
Conference_Titel :
Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003. Proceedings of the 2003 IEEE International
Print_ISBN :
0-7803-7688-9
DOI :
10.1109/FREQ.2003.1275073
