Title :
Linear ion trap for second order Doppler shift reduction in frequency standard applications
Author :
Prestage, J.D. ; Janik, G.R. ; Dick, G.J. ; Tucker, T.K. ; Maleki, L.
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
fDate :
31 May-2 Jun 1989
Abstract :
A novel linear ion trap is designed and being tested which permits storage of a large number of ions with reduced susceptibility to the second-order Doppler effect caused by the RF confining fields. This trap should store about 20 times the number of ions storable by a conventional RF trap, with no corresponding increase in second-order Doppler shift from the confining field. In addition the sensitivity of this shift to trapping parameters, i.e. RF voltage, RF frequency, and trap size, is greatly reduced. Mercury ions and xenon ions are trapped in the presence of helium buffer gas. Trap times as long as 2×10 3 s have been measured
Keywords :
Doppler effect; atomic clocks; frequency measurement; ion optics; measurement standards; time measurement; 2×103 s; He buffer gas; Hg ions; RF confining fields; Xe ions; frequency standard applications; linear ion trap; second order Doppler shift reduction; Clocks; Doppler effect; Doppler shift; Laboratories; Propulsion; Radio frequency; Stability; Standards development; Testing; Voltage;
Conference_Titel :
Frequency Control, 1989., Proceedings of the 43rd Annual Symposium on
Conference_Location :
Denver, CO
DOI :
10.1109/FREQ.1989.68848
