ACES/PHARAO: high-performance space-to-ground and ground-to-ground clock comparison for fundamental physics

Autor: C. Guerlin, F. Meynadier, C. Le Poncin-Lafitte, Marc Lilley, Peter Wolf, P. Delva, Etienne Savalle, M. C. Angonin
Přispěvatelé: Systèmes de Référence Temps Espace (SYRTE), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Bureau International des Poids et Mesures (BIPM)
Rok vydání: 2021
Předmět:
Zdroj: GPS Solutions
GPS Solutions, Springer Verlag, 2021, 25 (2), ⟨10.1007/s10291-020-01058-y⟩
ISSN: 1521-1886
1080-5370
DOI: 10.1007/s10291-020-01058-y
Popis: The Atomic Clock Ensemble in Space is a fundamental physics mission of the European Space Agency to be launched in August 2021. It relies on a high-performance clock onboard the International Space Station (ISS), a network of high-performance clocks on ground, a dedicated 2-way microwave link (MWL) enabling space-to-ground and ground-to-ground clock comparisons, as well as an optical link (ELT). PHARAO/SHM (Projet d’Horloge Atomique par Refroidissement d’Atomes en Orbite/Space Hydrogen Maser), the clock onboard the ISS, has a relative frequency accuracy at the $${10}^{-16}$$ level, a relative frequency stability (Allan deviation) equal to $${10}^{-13}/\sqrt{\tau }$$ ( $$\tau$$ being the integration time in seconds) and a time deviation of 12 picoseconds after one day of integration. The MWL is designed to reach a time deviation below 7 ps after one day of integration. While space-to-ground clock comparisons will enable precise tests of the gravitational redshift, tests of deviations from General Relativity at the $${10}^{-6}$$ level, and tests of local Lorentz invariance at the $${10}^{-10}$$ level, ground-to-ground clock comparisons will enable a search of the time variation of fundamental constants with uncertainty at the $${10}^{-17}$$ level after one year. In this contribution, we review the mission setup with a particular emphasis on the MWL, discuss the simulation and data analysis software developed to investigate mission performance, focusing on its primary scientific objective: the test of the gravitational redshift.
Databáze: OpenAIRE
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