Title :
A cryogenic linear ion trap for /sup 199/Hg/sup +/ frequency standards
Author :
Miller, J.D. ; Berkeland, D.J. ; Cruz, F.C. ; Bergquist, J.C. ; Itano, W.M. ; Wineland, D.J.
Author_Institution :
Time & Frequency Div., Nat. Inst. of Stand. & Technol., Boulder, CO, USA
Abstract :
A cryogenic linear rf trap has been constructed to study the accuracy of a clock based on laser cooled /sup 199/Hg/sup +/. Crystals of tens of ions have been observed. The residual micromotion of the ions has been minimized and Ramsey interrogation periods of 100 s have been demonstrated for the 40.5 GHz transition. Systematic shifts to the clock transition due to magnetic field fluctuations as well as heating of the ions during the clock cycle have been evaluated. This system should eventually provide a frequency standard of high precision and accuracy.
Keywords :
atomic clocks; frequency measurement; frequency stability; ground states; hyperfine structure; low-temperature techniques; measurement standards; mercury (metal); particle traps; radiation pressure; /sup 199/Hg/sup +/ frequency standards; 40.5 GHz; Hg; Ramsey interrogation periods; accuracy; clock; clock cycle; clock transition; cryogenic linear ion trap; cryogenic linear rf trap; heating; high precision; laser cooled /sup 199/Hg/sup +/; magnetic field fluctuations; residual micromotion; Clocks; Cooling; Cryogenics; Crystals; Doppler shift; Frequency conversion; Laser transitions; Mercury (metals); Stability; Temperature;
Conference_Titel :
Frequency Control Symposium, 1996. 50th., Proceedings of the 1996 IEEE International.
Conference_Location :
Honolulu, HI, USA
Print_ISBN :
0-7803-3309-8
DOI :
10.1109/FREQ.1996.560298
