t-sage : twin-space accelerometers for gravitation...
TRANSCRIPT
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MICROSCOPEMICRO-Satellite pour l’Observation du Principe d’Equivalence
T-SAGE : Twin-Space Accelerometers for Gravitation Experiement
« Les bijoux accélérométriques de MICROSCOPE »
Manuel Rodrigues, chef de [email protected]
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2 MICROSCOPE
Sommaire
• Historique de l’accélérométrie spatiale à l’Onera
• T-SAGE dans la mission MICROSCOPE
• Quelques mesures accélérométriques de T-SAGE en orbites
Toutes les photos sans © doivent être comprises © ONERA
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3 MICROSCOPE
CHAMP, GRACE, GOCE, MICROSCOPE ...
CACTUS Accelerometre – 1975– 10-8 m/s 2/Hz1/2
Accelerometers for geodesyJPL / Germany – GRACE-FO – Launch scheduled in 2018ESA – GOCE – 2009 – 10-12 m/s 2/Hz1/2
JPL / DLR – GRACE – 2002 – 10-10 m/s 2/Hz1/2
CNES / DLR – CHAMP – 2000 – 10-9 m/s 2/Hz1/2
Accelerometer for fundamental physicCNES / ONERA – Microscope – 2016 – 10-12 m/s 2/Hz1/2
Future missions 2020 – 2030 ?Geodesy NGGM ( ESA) – GRACE-2 (NASA)
ONERA, 4 décades of know-how
7 FLIGHTS15 accelerometers in orbit
100% of successMajor science Return
Accelerometer for microgravityNASA – Missions Microgravity Space Laboratory-1 – April & J uly 1997ESA – Mission Life and Microgravity Science – July 1996
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4 MICROSCOPE
Example of science return in Geodesy
GRIM 5sBiancale R et al., 2000
Free air gravity anomalies of South America (mGal)
GGM03s Tapley et al 2007
GOCE TIM4Pail et al 2011
GEM9Lerch FJ et al. 1979
CHAMP GRACE GOCELAGEOS-GEOS3
DLR/CNES NASA/DLR ESA
1979 2000 2007 2011
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5 MICROSCOPE
Galileo Galilei «Free-Fall » in space Microscope
Universality of free-fall test – MICROSCOPE
Comparison of 2 test-masses acceleration
Ultrasensitive Accelerometer
Need to measure 10-15g @ orbital frequency
SUREF : Pt/Pt => The Zero RefSUEP : Pt/Ti => EP test
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: Objective to be evaluated @ 10-15 accuracy
Difference of acceleration
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6 MICROSCOPE
T-SAGE = charge utile ONERA de MICROSCOPE : précision au micromètre et au microvolt
Capteur: SU PE + SU REF• 2 accéléromètres différentiels • Cœur en Silice dorée réalisé par le
procédé ONERA d’usinage par ultra-sons à qq µm
• Précision de réalisation et d’intégration de toutes les pièces (céramique, silice, titane, invar, PtRh,….) de 1 à 5 µm
Electronique de proximité: FEEU• Un FEEU pour chaque SU• Electronique analogique: détecteurs capacitifs, CNA, CAN, FPGA• Bruit des tensions de référence
0.2µV Hz-1/2
• Bruit de mesure <1µV Hz-1/2
Electronique numérique d’interface satellite: ICU• 1 ICU par FEEU l’un sur l’autre• DSP (calculateur), FPGA• Calcul: 40bits • Télémétrie science = 4Hz / 24bits
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7 MICROSCOPE
Principe de mesure de l’accéléromètre électrostatiq ue asservi
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8 MICROSCOPE
( ) ( )i ci piC f fα α= +
C1
C2
αp
αc
e1e2
C1C2
( )1ii eC f=
C1C2
L2 L1
( )i iC f L=
X+
X-
ΦΦΦΦ2+
ΦΦΦΦ4-
ΦΦΦΦ2-ΦΦΦΦ4+
SUP+
SUP-
Y1+Y1- Y2+
Y2-
Z1+
Z1-Z2+
Z2-Z1-
Z2-
Y2-
X-
Y1-X+
SUP+
ΦΦΦΦ2-
ΦΦΦΦ2+
Configuration des électrodes
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9 MICROSCOPE
Cœur du senseur
Masses de test
Cylindres en silice dorée pour les électrodes
Système de vide
Système de blocage des masses d’épreuve
Circuits internes des connexions coaxiales
Connecteurs hermétiques
« Chapeau » en silice pour le centrage précis des électrodes
Réservoir 24bars
Electro-valves
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10 MICROSCOPE
THE PAYLOAD
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11 MICROSCOPE
Instrument Development : Phase C2Detailed definition of the production processes
Production of MQTH, QM, FM parts: ~ 5µm accuracy ma chiningDiamond drill and ultrasonic machining for silica p arts
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12 MICROSCOPE
Instrument Development : Phase C2METROLOGY MUCH MORE DIFFICULT THAN PRODUCTION
Production of QM , FM parts : ~ 1à 5 µm accuracyMetallic parts free of magnetic materials (titanium alloy)Housing made in Invar for magnetic shielding (speci fic process of production that guarantees 50 factor attenuation)
Test-mass made in PTB, Germany
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13 MICROSCOPE
Catapult test to validate the qualification or the ac ceptancein BREMEN
(c) ZARM
(c) ZARM
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14 MICROSCOPE
Catapult test to validate the qualification or the ac ceptance(Drop n°61 with QM, contribution from H. Selig - ZARM)
Slow motion (speed/2)(c) ZARM-H. Selig
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15 MICROSCOPE
Integration du satellite
2016
(c) CNES-Grimault
(c) CNES-Grimault
(c) CNES
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16 MICROSCOPE
MICROSCOPE GROUND SEGMENT
CNESCNES +Ground stations
ONERA (CMS-M)
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17 MICROSCOPE
What do we measure? Each mass acceleration
[ ]
( )
( ) ( )( ) ( )( )2
1,2
0,2
0,1,2
1
1
/1,
2
2
1
2
1)(
dxdxappcxxxresdxx
cxxxresdxdxappcxx
res
t
dydy
dzdz
dx
z
y
x
t
cycy
czcz
cx
satxcxdxmes
bbCK
bCbK
C
K
InT
K
gKfep
df
df
df
+Γ+−+Γ⋅+
−+Γ⋅+Γ⋅⋅+
+Γ⋅
−++
∆∆∆
⋅−⋅
−++
⋅⋅=Γ
ρρ
θηθη
θηθη
δ Searched EP signal
Impact of gravity gradient and s/c angular motion
Impact of residual acceleration through the differe nce of 2 TM matching
Impact of non linear terms
( )Cfepdfrescmes
ρρρ+Γ=Γ )(,
( )1,2,, 2
1ismesismescmes Γ+Γ=Γ
ρρρ
( )1,2,, 2
1ismesismesdmes Γ−Γ=Γ
ρρρ2,ismesΓ
ρ
1,ismesΓρ
MEASURED CALIBRATED FOR CORRECTION CALIBRATED FOR VERIFICATION
N1 LEVEL = N0c + SF+alignment
N2 LEVEL
Reduced by drag-free & attitude controlor by construction
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18 MICROSCOPE
11th of May 2016 : Switch from Full Range Mode to High Resolution Mode (HRM)
Seconds
Acceleration of Xinner of SUEP
S/C is in MNOGMagnetotorquer ControlOf the Attitude
Cold Gaz Thrusters used in combination with SSTto Finely control the attitude of S/C.
First Swith on of HRM(science mode).S/C is rotating with a small conic motion
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19 MICROSCOPE
Quelques résultats préliminaires
• Accélération différentielle SUEP – session 218 (mars 2017) – 120 orbites
• FFT de l’accélération différentielle FFT une fois corrigée du gradient de gravité
∆x = (20.15 +/- 0.03) µm ∆z=(-5.69 +/- 0.03) µm
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20 MICROSCOPE
Inertial pointing during 1 day
X axis of SUEP
Y axis of SUEP – Normal to the orbit
Z axis of SUEP
Effect of Earth’s eclipse: the Sun radiation is no morepushing on the satellite => ~3 10-8m/s² is the acceleration due to photonsPressure on satellite
Orbital period
DRAG ~ 2 10-8m/s²
Photon pressure on s/c ~ 3 10-8m/s²
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Session in spin V2 – SUREF – Earth’s gravity effect subtracted
f_ep
Resolution @ fep~1.5 � 10�����������/�
In good agreement with theory
Theoretical gold wire damping noise with
stiffness measured in flight
Spin V2 = 0.7 x 10 -3Hz
21 CNES 6-7 of september 2017 – LISAPF / MICROSCOPE workshop
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Thermal noise
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Position capacitive noise
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22 MICROSCOPE
The commissioning phase results: Variations of Temperatures in the SU & in the FEEU
No signal @ 10µK level
No signal @ 10µK level
No signal @ 15µK level between each end of the test-masses
Radiometer or radiation pressure effect
à ��
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∆%
%< 5 10-16m/s²
à ��
�!#�&∆%
'()*'< 10-15m/s²
Thermal stability of parasitic forces
Sensitivity tests performed on May 2017, under analysis
Thermal stability of electronics biases
Sensitivity tests performed on May 2017 => systematics of 0.7x 10-15 m/s²
fEP
fEP
fEP
Variations of temperature 2 orders of magnitude better than specified
FFT of temperature probes
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23 MICROSCOPE
Bilan T-SAGE au bout de 660 jours en orbites
• Malgré 3 anomalies sur des condensateurs (SUREF), les 2 doubles accéléromètres électrostatiques (SUEP et SUREF) ont bien fonctionné
• Beaucoup de données scientifiques et techniques à dépouiller finement pour améliorer le modèle instrumental
• Instrument très sensible (micro-débris ou craquement MLI-revêtement du satellite + des vibrations de l’environnement autour de 25-50Hz non compris)
• PRL 04/12/17, Touboul et al, donne une différence d’accélération sur X< 10-13m/s² @ fep
• Sur tous les axes perfos meilleures que 5 x10-14m/s² autour de 0.02 Hz sur 320 orbites
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24 MICROSCOPE
Le scénario de fin de mission
• Fin des expériences scientifiques: 16 février 2018� 10 000 000 sec de mesure cumulée disponible fin février 2018 pour le test
EP (SUEP)� Les étalonnages et les caractérisations ~ 60 sessions / SU réparties sur 1,5
ans• Expérience Techno T-SAGE: Mars - Avril 2018• Expérience Techno satellite + Aéronomie: Mai - Septe mbre 2018
• Passivation du satellite en septembre 2018