A mercury ion frequency standard engineering prototype for the NASA deep space network
- 24 December 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1073-1081
- https://doi.org/10.1109/freq.1996.560296
Abstract
An engineering prototype linear ion trap frequency standard (LITS-4) using /sup 199/Hg/sup +/ is operational and currently under test for NASA's Deep Space Network (DSN). The DSN requires high stability and reliability with continuous operation. For practical considerations optical pumping and atomic state selection are accomplished with a /sup 202/Hg/sup +/ RF discharge lamp, and the trapped ions are cooled to near room temperature using a helium buffer gas. The standard is closely modeled from earlier research standards LITS-1 and LITS-2 which have demonstrated excellent frequency stability for uninterrupted comparison intervals up to 5 months. During an initial 135 day test in the DSN, LITS-4 operated continuously using a quartz crystal as the local oscillator. Recent signal to noise measurements indicate that a short term stability of /spl sigma//sub y/(/spl tau/)=2.0/spl times/10/sup -14///spl tau//sup 1/2/ can be achieved when operated with a sufficiently stable local oscillator.Keywords
This publication has 12 references indexed in Scilit:
- Long term stability of Hg/sup +/ trapped ion frequency standardsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Improved linear ion trap physics packagePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Recent stability comparisons with the JPL linear trapped ion frequency standardsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Digital frequency-lock loop using high-resolution TAC and advanced control algorithm for trapped-ion frequency standardsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Eight years of experience with mercury stored ion devicesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Progress report on the improved linear ion trap physics packagePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Hg/sup +/ trapped ion standard with the superconducting cavity maser oscillatorIEEE Transactions on Instrumentation and Measurement, 1993
- Ultra-stable Hg+Journal of Modern Optics, 1992
- New ion trap for frequency standard applicationsJournal of Applied Physics, 1989
- Thermalization of199Hg ion macromotion by a light background gas in an RF quadrupole trapApplied Physics B Laser and Optics, 1985