NDLI: Results of the ACES engineering model system test

Content Provider	IEEE Xplore Digital Library
Author	Leger, B. Stringhetti, L. Massonnet, D. Delaroche, C. Picard, F. Hess, M.P. Cacciapuoti, L. Feltham, S. Much, R. Nasca, R. Vudali, T. Salomon, C. Laurent, P.
Copyright Year	2010
Description	Author affiliation: Astrium Space Transp., Friedrichshafen, Germany (Stringhetti, L.; Hess, M.P.) \|\| Eur. Space & Technol. Centre, ESTEC/Eur. Space Agency, Noordwijk, Netherlands (Cacciapuoti, L.; Feltham, S.; Much, R.; Nasca, R.; Vudali, T.) \|\| CNES, Toulouse, France (Leger, B.; Massonnet, D.; Delaroche, C.; Picard, F.) \|\| ENS, Lab. Kastler Brossel, Paris, France (Salomon, C.) \|\| LNE-SYRTE, Obs. de Paris, UPMC, Paris, France (Laurent, P.)
Abstract	Atomic Clock Ensemble in Space (ACES) is a European Space Agency (ESA) project to be deployed externally to the Columbus Laboratory on the International Space Station (ISS). Two high performance atomic clocks on-board ACES generate a frequency reference with stability and accuracy at the $1×10^{-16}$ level. The performance of the ACES clock signal results from the combination of the good short-term stability of an active hydrogen maser (SHM) and the long-term stability and accuracy of a primary standard based on samples of laser cooled Cs atoms (PHARAO). The two clocks are controlled by two servo loops, the first stabilizing the PHARAO local oscillator on SHM clock signal, the second correcting the long-term instabilities of SHM using the error signal generated by the PHARAO Cs resonator. This frequency reference, distributed to the ground by a link in the microwave domain is used to perform comparisons of distant clocks and to test Einstein's theory of general relativity. ACES main instrument and subsystems have now reached a high technology readiness level, demonstrated by the completion and the successful test of their engineering models. In particular, a dedicated test campaign has recently verified the performance of the ACES system, where PHARAO and SHM, locked together via the ACES servo loops, are operated as a unique oscillator to generate the ACES frequency reference. The test campaign conducted at CNES premises in Toulouse between July and November 2009 has concluded the engineering models phase, releasing the manufacturing of the ACES flight models. The setup of the ACES system test campaign, the specific tests performed, and the achieved results will be presented and discussed.
Starting Page	1
Ending Page	8
File Size	418527
Page Count	8
File Format	PDF
ISBN	9781467359702
e-ISBN	9781467359696
DOI	10.1109/EFTF.2010.6533731
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in