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Progress on small mercury ion clock for space applications

Show simple item record Prestage, John D. Chung, Sang K. Thompson, Robert J. MacNeal, Paul 2014-08-26T23:21:11Z 2014-08-26T23:21:11Z 2009-04-20
dc.identifier.citation EFTF-IFCS 2009 Joint Conference: European Frequency and Time Forum (EFTF) and International Frequency Control Symposium (IFCS), Besancon, France, April 20-24, 2009 en_US
dc.identifier.clearanceno 09-1581
dc.description.abstract We have recently completed a breadboard 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 ~1-2x10-¹³ 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 over three 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 bake-out to prepare for tube seal-off. This approach to the vacuum follows the methods used in flight vacuum tube electronics, such as flight TWTA’s where tube operation lifetime and shelf life of up to 15 years is achieved. 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, 2009 en_US
dc.subject atomic clock en_US
dc.subject ion trap en_US
dc.subject navigation en_US
dc.subject timing en_US
dc.subject positioning en_US
dc.title Progress on small mercury ion clock for space applications en_US
dc.type Presentation en_US

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