| Zugriffsnummer | 41646 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks |
| Autor(in); Institution |
Weyers, Stefan; 4.4, Zeit und Frequenz, PTB-Braunschweig
Gerginov, Vladislav; 4.4, Zeit und Frequenz, PTB-Braunschweig; University of Colorado, Boulder, CO, USA
Kazda, Michael; 4.4, Zeit und Frequenz, PTB-Braunschweig
Rahm, Johannes; 4.4, Zeit und Frequenz, PTB-Braunschweig
Lipphardt, Burghard; 4.4, Zeit und Frequenz, PTB-Braunschweig
Dobrev, Georgi; 4.4, Zeit und Frequenz, PTB-Braunschweig; Sofia University 'St. Kliment Ohridski', Faculty of Physics, Sofia, BULGARIA
Gibble, K.; The Pennsylvania State University, Department of Physics, University Park, PA, USA
|
| Quelle/Jahr | Metrologia: 55 (2018), 6, 789 - 805 |
| ISSN | 0026-1394 (PRINT) ; 1681-7575 (ONLINE) |
| DOI | |
| Verlag | Bristol: IOP Publishing |
| Freie Schlagworte | atomic fountain clocks ; primary frequency standards ; SI second ; international atomic time ; frequency metrology |
| Zusammenfassung | Improvements of the systematic uncertainty, frequency instability, and long-term reliability of the two caesium fountain primary frequency standards CSF1 and CSF2 at PTB (Physikalisch-Technische Bundesanstalt) are described. We have further investigated many of the systematic effects and made a number of modifications of the fountains. With an optically stabilized microwave oscillator, the quantum projection noise limited frequency instabilities are improved to 7.2 × 10-14(τ/1 s)-1/2 for CSF1 and 2.5 × 10-14(τ/1 s)-1/2 for CSF2 at high atom density. The systematic uncertainties of CSF1 and CSF2 are reduced to 2.74 × 10-16 and 1.71 × 10-16, respectively. Both fountain clocks regularly calibrate the scale unit of International Atomic Time (TAI) and the local realization of Coordinated Universal Time, UTC(PTB), and serve as references to measure the frequencies of local and remote optical frequency standards. |
| Themenbereich der Metrologie | Zeit und Frequenz |
| Forschungsprojekt | SIB55: ITOC: International timescales with optical clocks ; 15SIB05: OFTEN: Optical frequency transfer - a European network |
| Förderinformationen (1) |
Förderername: European Commission (EC)
Förderer ID: 0000 0001 2242 8989 Förderer ID Typ: ISNI Förderprogramm: EMRP 2012 SI Broader Scope Titel der Förderung: SIB55: ITOC: International timescales with optical clocks Förderungsnummer: SIB55 |
| Förderinformationen (2) |
Förderername: European Commission (EC)
Förderer ID: 0000 0001 2242 8989 Förderer ID Typ: ISNI Förderprogramm: EMPIR 2015 SI Broader Scope Titel der Förderung: 15SIB05: OFTEN: Optical frequency transfer - a European network Förderungsnummer: 15SIB05 |