Title :
Radio frequency measurements of cloud size in a linear ion trap
Author :
Prestage, John D. ; Tjoelker, Robert L. ; Maleki, Lute
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
Abstract :
In this paper we describe a method for measuring the size of an ion cloud inside a linear ion trap. At ~10-12 the 2nd order Doppler shift for trapped mercury ion frequency standards is one of the largest frequency offsets in these lamp based systems. Its measurement to the 1% level would represent an advance in insuring the very long term stability of these standards to the 10-14 or better level. This measurement is implemented with a novel 12-rod linear ion trap which we have developed and describe here
Keywords :
Doppler effect; Doppler shift; atomic clocks; frequency measurement; frequency stability; magnetic field effects; magnetic resonance; measurement standards; particle traps; 2nd order Doppler shift; cloud size; frequency offsets; harmonicity; ion cloud; linear ion trap; long term stability; radio frequency measurement; trapped mercury ion frequency standards; Clocks; Clouds; Doppler shift; Frequency measurement; Navigation; Radio frequency; Satellite ground stations; Size measurement; Space vehicles; Stability;
Conference_Titel :
Frequency Control Symposium, 1997., Proceedings of the 1997 IEEE International
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-3728-X
DOI :
10.1109/FREQ.1997.638548
