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Miniaturized mercury ion clock for ultrastable deep space applications

Show simple item record Prestage, John D. Chung, Sang Lim, Lawrence Le, Thanh 2007-07-23T16:15:29Z 2007-07-23T16:15:29Z 2006-12-05
dc.identifier.citation 38th Annual Precise Time and Time Interval (PTTI) Meeting, Reston, Virginia, December 5-7, 2006. en
dc.identifier.clearanceno 07-0487
dc.description.abstract We have recently completed a prototype ion-clock physics package based on Hg ions shuttled between a quadrupole and a 16-pole rf trap. With this architecture we have demonstrated short-term stability ~2-3x10-13 at 1 second, averaging to 10-15 at 1 day. This development shows that H-maser quality stabilities can be produced in a small clock package, comparable in size to an ultra-stable quartz oscillator required for holding 1-2x10-13 at 1 second. This performance was obtained in a sealed vacuum configuration where only a getter pump was used to maintain vacuum. The vacuum tube containing the traps has now been under sealed vacuum conditions for nearly 1.5 years with no measurable degradation of ion trapping lifetimes or clock short-term performance. Because the tube is sealed, the Hg source and Neon buffer gas are held indefinitely, for the life of the tube. There is no consumption of Hg in this system unlike in a Cs beam tube where lifetime is often limited by Cs depletion. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 605404 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2007. en
dc.subject atomic clocks en
dc.subject space clocks en
dc.subject mercury ion clocks en
dc.title Miniaturized mercury ion clock for ultrastable deep space applications en
dc.type Preprint en

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