Status of the ACES/PHARAO mission
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- Mariah Harmon
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1 XLII nd Rencontres de Moriond,, March 2007 «Gravitational Waves and Experimental Gravity» Status of the ACES/PHARAO mission Noël DIMARCQ, SYRTE, Paris Observatory What is ACES : payload, science objectives, Status of PHARAO and other ACES instruments Conclusions Rencontres de Moriond La Thuile, march
2 ACES actors 150 contributing people INVESTIGATORS : Laboratoire Kastler-Brossel, Ecole Normale Supérieure (Paris, France) SYRTE, Paris Observatory (France) Neuchâtel Observatory (Switzerland) SUPPORT : European Space Agency Centre National d Etudes Spatiales CORE INDUSTRIAL TEAM : Rencontres de Moriond La Thuile, march
3 What is ACES : payload, science objectives, Rencontres de Moriond La Thuile, march
4 ACES : Atomic Clock Ensemble in Space ACES payload on ISS PHARAO XPLC FCDP MWL space segment SHM TM TC XPLC : payload computer PHARAO : Cold Cs atom clock SHM : Space Hydrogen Maser FCDP : Frequency Comparison and Distribution Package MWL : Microwave Link MWL ground terminals ACES ground segment ACES control and mission center Rencontres de Moriond La Thuile, march
5 ACES Ground Stations (January 07) Australia: Austria: Brazil: Canada: China: Germany: UWA, CSIRO (Sydney) Univ. Innsbruck Univ. Sao Carlos NRC Shangai Obs, NIM, NTSC PTB, MPQ, Univ. Hannover, Univ. Düsseldorf, TU Muenchen, Univ. Erlangen France: SYRTE, CNES, Obs. Besançon, OCA, LPL Italy: INRIM, Univ. Firenze Japan: Tokyo Univ., NMIJ, CRL Russia: Vniftri, ILS Novosibirsk Swiss: METAS, ON England: NPL USA: JPL, NIST, JILA, Penn St. Univ., USNO Taiwan: Telecom research lab Int. Agency: BIPM Total : 35 institutes + theory groups > 280 researchers Rencontres de Moriond La Thuile, march
6 THE ACES PAYLOAD ONBOARD ISS European Columbus module ACES Payload Launch scheduled in 2013 with the japanese HTV Rencontres de Moriond La Thuile, march
7 THE ACES PAYLOAD Rencontres de Moriond La Thuile, march
8 ACES science objectives Study of cold atoms physics in space (first cold atom instrument in space!) Demonstration of PHARAO and SHM high performance ( ν / ν ) Demonstration of MWL high performance (time noise < 10 ps / day) Time comparisons between ACES clocks and ground located clocks : - T&F metrology, improvement of atomic time scales - Test of general relativity : measurement of the gravitational red shift (@ 2 ppm) search for a possible drift of fundamental constants ( / year) - Test of special relativity (preferred frame) : search for a possible anisotropy in light velocity : δ c c < Rencontres de Moriond La Thuile, march
9 Comparison scenarios Space clock to ground clock comparison Short comparison sessions (300 s) separated by large dead times A few comparison sessions per day Uncertainty : 0.3 ps over one ISS pass, 6 ps over 1 day Rencontres de Moriond La Thuile, march
10 Comparison scenarios Ground clocks comparison in common view Up to 4 simultaneous ground stations in common views Time stability of the ground clock comparison < 1 ps Capability to compare ground clocks with a resolution of 1 day Rencontres de Moriond La Thuile, march
11 Comparison scenarios Ground clocks comparison in non-common view Time stability of the ground clock comparison : a few ps Capability to compare ground clocks with a resolution better than 1 day Most distant stations: Paris-Perth Between 1 and 2 non common views per day within less than 3000 seconds Several non common views within seconds Overall: less than 10 ps at half day, ie Rencontres de Moriond La Thuile, march
12 ACES INSTREMENTS STATUS Rencontres de Moriond La Thuile, march
13 PHARAO sub-systems Microwave source For the atoms interrogation Cesium tube For all the atoms/fields interactions Laser source For radiative cooling and launching, atom state preparation and clock signal detection Computer For the whole experiment control, data storage and processing Rencontres de Moriond La Thuile, march
14 PHARAO sub-systems : the microwave source EM test with SYRTE cold atom fountain : Standard deviation σ y (τ) time (second) σ y (τ) = τ 1/2 The best result ever obtained with a quartz oscillator Rencontres de Moriond La Thuile, march
15 PHARAO sub-systems : the cesium tube Ramsey cavity Quantum state preparation Cold atom source Clock signal detection Rencontres de Moriond La Thuile, march
16 PHARAO sub-systems : the laser source Rencontres de Moriond La Thuile, march
17 PHARAO EM assembly in CNES Toulouse Cesium tube cold 1 µk ν=5.5 Hz Laser source Rencontres de Moriond La Thuile, march
18 PHARAO EM performance tests in CNES Toulouse Frequency stability : σ y (τ) = τ 1/2 τ [s] Compatible with σ y (τ) < τ 1/2 in space ( ν < 1 Hz) Frequency accuracy : under evaluation (10-15 expected on ground, in space) Rencontres de Moriond La Thuile, march
19 Other ACES instruments status Feasibility demonstration of SHM is done. EM delivered in 2007 Successful tests of phase comparison and phase lock loop with FCDP EM (in CNES) Measured noise of MWL/DLL at Ku band: 160 fs at 1 s Flight antenna tests Full tests of MWL EM flight segment in March 2007 Rencontres de Moriond La Thuile, march
20 CONCLUSIONS PHARAO and FCDP EM already delivered The other instrument EM delivered by the end of 2007 Many specific studies on the payload (thermal, microvibrations, orbit determination, ) 2007 : a very important step for the project (CNES decision to fund the PHARAO FM) Scheduled launch date : 2013 (mission duration > 18 months) ACES is both a scientific mission and a technology demonstrator for cold atom based missions (validation in space of complex laser systems, UHV equipment, ultrastable RF electronics, ) Precursor of the next generations of atomic quantum sensors for space missions (clocks, accelerometers, gyroscopes, gravity acceleration / potential sensors ) Other T/F metrology missions : T2L2 on board Jason 2 (2008) Rencontres de Moriond La Thuile, march
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