NDLI: ACES status at completion of the engineering models phase

Content Provider	IEEE Xplore Digital Library
Author	Cacciapuoti, L. Much, R. Feltham, S. Nasca, R. Vudali, T. Hess, M.P. Stringhetti, L. Salomon, C.
Copyright Year	2010
Description	Author affiliation: Lab. Kastler Brossel, ENS, Paris, France (Salomon, C.) \|\| Astrium Space Transp., Friedrichshafen, Germany (Hess, M.P.; Stringhetti, L.) \|\| Eur. Space & Technol. Centre, ESTEC/Eur. Space Agency, Noordwijk, Netherlands (Cacciapuoti, L.; Much, R.; Feltham, S.; Nasca, R.; Vudali, T.)
Abstract	Atomic Clock Ensemble in Space (ACES) is a pioneering mission that will use high performance atomic clocks to test fundamental laws of physics. Operated in the microgravity environment of the International Space Station, the ACES clocks, PHARAO and SHM, will generate a frequency reference reaching instability and inaccuracy at the $1·10^{-16}$ level. A high-performance link in the microwave domain (MWL) will distribute on ground the ACES signal allowing for comparisons of distant clocks to a frequency resolution of $1·10^{-17}.$ ACES will connect ground clocks based on different atoms and atomic transitions in a worldwide network that will probe fundamental laws of physics to high accuracy. Space-to-ground and ground-to-ground comparisons of atomic frequency standards will be used to test Einstein's theory of general relativity including a precision measurement of the gravitational red-shift, a search for time variations of fundamental constants, and tests of special relativity. Applications in geodesy, GNSS remote sensing, optical time transfer, and ranging (via the ELT optical link) will also be supported. ACES has presently reached an advanced status of development, with engineering models of key instruments and subsystems completed and tested. The ACES Payload Critical Design Review and the Ground Segment Preliminary Design Review were recently completed. The ACES engineering model workbench has been integrated and characterized in a test campaign recently conducted at CNES facilities in Toulouse. The first prototype of the ACES MWL ground terminal is being assembled ready for delivery. The ACES ground segment architecture has been defined. Based on an extension of the standard Columbus USOC (User Support and Operations Center) located in CADMOS - Toulouse, the ACES USOC will remotely control the network of MWL ground terminals, and it will provide the necessary interface with the Columbus Control Center and the ACES user community. The current development status of the ACES mission elements will be presented and discussed. An overview of future planning will be given.
Starting Page	1
Ending Page	10
File Size	330298
Page Count	10
File Format	PDF
ISBN	9781467359702
e-ISBN	9781467359696
DOI	10.1109/EFTF.2010.6533729
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-04-13
Publisher Place	Netherlands
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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