Title :
Probing magnetic field effects in 12-pole linear ion trap frequency standards
Author :
Burt, Eric A. ; Prestage, John D. ; Tjoelker, Robert L.
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
Abstract :
The second-order Zeeman shift in a 12-pole buffer-gas-cooled linear ion trap frequency standard is characterized. Results for magnetic shielding effectiveness and long term stability against magnetic field perturbations are presented. The clock frequency is found to be stable against typical ambient magnetic field fluctuations to less than 2×10-16. The frequency shift as a function of ion number is also studied and a plausibility argument is given relating this to magnetic field inhomogeneity.
Keywords :
Zeeman effect; atomic clocks; frequency standards; magnetic fields; magnetic shielding; particle traps; 12-pole buffer-gas-cooled linear ion trap; ambient magnetic field fluctuations; clock frequency; frequency standard; ion number; long term stability; magnetic field inhomogeneity; magnetic field perturbations; magnetic shielding effectiveness; plausibility argument; second-order Zeeman shift; Clocks; Doppler shift; Frequency; Helium; Magnetic field measurement; Magnetic shielding; Nitrogen; Pressure measurement; Probes; Stability;
Conference_Titel :
Frequency Control Symposium and PDA Exhibition, 2002. IEEE International
Print_ISBN :
0-7803-7082-1
DOI :
10.1109/FREQ.2002.1075927
