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Compact microwave mercury ion clock for Deep-Space Applications

Show simple item record Prestage, John D. Chung, Sang K. Lim, Lawrence Matevosian, Annond 2009-06-30T14:31:49Z 2009-06-30T14:31:49Z 2007-05-30
dc.identifier.citation European Frequency and Time Forum- International Frequency Control Symposium (EFTF-IFCS ), Geneva, Switerland, May 30, 2007. en_US
dc.identifier.clearanceno 07-2003
dc.description.abstract We have recently completed a breadboard ion-dock physics package based on Kg ions shuttled between a quadrupole and a 16-pole rf trap. With this architecture we have demonstrated short-term stability -1-2xl0-13 at 1 second, averaging to 10-15 at 1 day. This development shows that 8- maser quality stabilities can be produced in a small clock package, comparable in size to an oItra-stable quartz oscillator required for holding 1-2xl0-13 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 onder sealed vacuum conditions for nearly two years with no measurable degradation of ion trapping lifetimes or clock short-term performance. We have fabricated the vacuum tube, ion trap and UV windows from materials that will allow a - 400°C tube bake-out to prepare for tube sealoff. This approach to the vacuum follows the methods used in mght vacuum tube electronics, such as flight TWTA's where tube operation lifetime and shelf life of up to 15 years is achieved. We use neon as a buffer gas with 2-3 times less pressure induced frequency pulling than helium and, being heavier, negligable diffusion losses will occur over the operation lifetime. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2007. en_US
dc.subject atomic clock en_US
dc.subject space clock en_US
dc.subject mercury ion clock en_US
dc.title Compact microwave mercury ion clock for Deep-Space Applications en_US
dc.type Preprint en_US

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