Doppler Spectro Imager
PI: F.X. Schmider (Observatoire Côte d’Azur, F)
PM: Fréderic Rouesnel (Institut d’Astrophysique Spatiale, F)
DSI-ECHOES team
Cosmic Vision 2015-2025
Assessment
Definition
Implementation
Phase 0/A
Phase A/B1
Phase B2/C/D
TRL ≥5
Euclid
M-class missions
DOI: Declaration of Interest
AO: Announcement of Opportunity
LOE: Letter of Endorsement
MLA: Multi-Lateral Agreement
Plato
M1 launch
Spica
M2 launch
Marco-Polo
Cross-Scale
Solar Orbiter
Instruments
AO
LOE
L-class missions
DOI
MLA
TRL ≥5
EJSM/Laplace
TSSM/Tandem
L1 launch
Lisa
IXO
Instruments
DOI
2008
2009
AO
LOE
2010
2011
MLA
2012
2013
2014
2015
2016
2017
2018
2019
2020
2
Doppler Spectro Imager
• Science goal : Formation and evolution
of the Solar System
• 2 objectives: Internal structure (M1)
•
Atmosphere study (L1 to L4)
3
Jovian seismology
Main goal
Solar system formation scenarii:
accretion, gravitational instability ?
Key question
Does Jupiter have a core ?
If any, what size/mass ?
What happens at the transition
metalic/molecular hydrogen ?
The tool
Seismology : most performant way to
investigate planetary and stellar internal
structures (e.g. SOHO for the Sun, CoRoT for
the stars)
Measurement of mode frequencies up to
degrees l=100
Complementarity with JUNO gravitational
moments
from Guillot et al. 2004
Study of the upper troposphere
Main goals
Origin of the global circulation of Jupiter,
Structure of the troposphere: interaction
between the envelope and the upper
atmosphere
Structure of the band system: its relation to
differential rotation
Key measurements
- Travelling waves detection and
characterisation (cross-correlation):
dynamics and composition
- Velocity field: thermodynamics quantities
and the “potential vorticity”
This latter quantity can be deduced from
observations of the wind field, together with
temperature profiles of the atmosphere.
The tool
Doppler measurements
 3D velocity maps
 wave propagation
5
DSI – ECHOES
Probing internal structure
Theoretical works: Vorontsov 76, Bercovici & Schubert 87, Gudkova
& Zarkhov 99, Lognonné 2007
obs - theoretical
Inversion method
obs - theoretical
6
DSI – ECHOES
Detection of acoustic modes
 Best detection level: 1 bar
 Velocity measurement
 2D images and velocity maps at 1 frame/mn
 Mode frequencies = [0.5 - 3.5] mHz
 Mode amplitudes = [10 - 50] cm/s (Bercovici and Schubert, 1987)
7
Instrument Study
Team organisation
LESIA (France)
B. Mosser
JPL (USA)
Neil Murphy
8
Instrument Study
Study Team
OCA
IAS
J-B Daban
Local Manager
Frederic Rouesnel
Project Manager
Yves Bresson
Optique
Gilles Morinaud
Mecanique
Carole Gouvret
Optique
Véronique Hervier
Electronique
Cathy Blanc
Gestion
Boubacar Bah
Electronique
Anne Philippon
Optique
JC Clec’h
Thermique
Didier Campistron
Qualité
Chloe Gallar
Assistante Projet
9
Instrument Study
Team members
Sylvie Robbe
OCA
France
10
DSI – ECHOES
SYMPA results
• First instrument dedicated to Jovian seismology
• Fourier transform tachometer: velocity measurement with spatial resolution
• Ground based network: 2 (3) instrument on 1.5 m telescopes
• Presence of a periodicity of 156 µHz in the density power spectrum ℓ= 0 and ℓ =1
• First clear evidence for Jovian acoustic mode (Gaulme et al 2010, to be submitted)
11
DSI – ECHOES
Instrument principle
Fourier tachometer
Fixed OPD Mach Zehnder interferometer
Four output images in phase quadrature
OPD modulation for calibration
Solar reference for absolute velocity
12
DSI – ECHOES
Velocity measurement
Measurement of combined vertical and horizontal
velocities: sum of Doppler shifts in direction of the
Sun + in direction of the S/C
Seismology: search for velocity variations
Global noise level < 1 cm²/s²/µHz up to l=100
Atmosphere: following of structure with jovian
rotation separates vertical and horizontal components
Precision: 20 m/s/px/hr (400x400 pxs @ 150 km )
DSI – ECHOES
Mission scenario
Atmosphere
Seismology
14
DSI – ECHOES
Block diagram
15
DSI-ECHOES
Optical study
Mach-Zehnder
Equivalent pupil diameter: 3.2 cm
Equivalent focal lengh:
Full field: 2.72 degrees
Pixel size: 18 µm
16
DSI - ECHOES
Mechanical design
Fine pointing
mirror
Filter
Pupil
Door
Triplet
Large pointing
mirror
Baffles
Doublet
Interferometer
unit
17
DSI - ECHOES
Mechanical design
Mach-Zehnder support:
Titanium plate
Modulation PZT support
Fine guiding mirror with PZT
18
DSI - ECHOES
Thermal and mechanical studies
19
DSI - ECHOES
Focal Plane Assembly
Hydra Startracker
Sodern
20
DSI - ECHOES
Calibration concept
The in-flight calibration should follow 3 steps:
sun
Optical
fibers
Diffuser
Door
Baffle
1st lens
- Distortion calibration: A star is pointed by the S/C
and acquired in the DSI field and its position
measured on the four sub images. Differential
positions on the sub-images provide the algorithm
of distortion correction.
- Flat field calibration: Uniform illumination of the
field is performed, with an internal source.
- Fringe calibration: with solar light uniform
illumination, the MZ OPD is modulated at 0, p/2, p,
3p/2, allowing the determination of the OPD
dependence in the field, i.e. the fringe contrast and
phase (OPD) at any point in each sub-image.
21
DSI – ECHOES
Interface and resources
Instrument type
Mass
Power consumption
Operating temperature
Operating temperature stability
Data volume
Data products
Wavelengths
FOV
Spatial Resolution
Filter bandwidth
Noise Velocity Level
Exposure times
Detection
Absolute calibration
Pointing stability
Mass
Power consumption
Volume
Mass
Volume
Power consumption
Compact interferometer
16.4 Kg
23.2 Watts with 25% margins
-10°C to 40°C
0.5 °C/h
70 Gbits
Velocity/intensity/ polarization maps
DSI-ECHOES – I unit
[519-520] nm
2.72 deg.
25 arcsec / pixel
1 nm
1 cm²/s²/µHz in [0.5 - 4] mHz range
5s
APS - 1k× 1k - 18 µm pix. (rad-hard qualified)
10 m/s
0.54 arcsec rms (1 s) over 5 s
13.0 Kg
6.37 Watts
(640 x 270 x 175) mm3
DSI-ECHOES – E/F unit
3.4 Kg
(290 x 220 x 95) mm3
16.88 Watts
22
DSI – ECHOES
Descope options
23
DSI – ECHOES
Follow- up
 Before the AO [..] will complete the study of each sub-system and will examine the
technical descope options in order to reduce the S/C resources requirement. It will be
focussed on the full data acquisition and treatment simulation, in order to eliminate
possible redundancies in the calibration system and reduce the data rate.
 […] also pay attention to the consolidation of the consortium for the AO answer.
 Two TDAs are also being carried:
 complete MZ breadboarding  R&T on going,
 radiation mitigation.
 “Other subsystems require a special attention to reach the TRL 5 before 2012.
Although these subsystems are not technological development, these activities
are listed in the planning.”
 Calibration sub-system
 Detector Unit (PRNU stability)  R&T submitted for 2011
DSI – ECHOES
Global budget
• Global Budget for DSI-Echoes (overall PFM program) :
DSI - Echoes ROM cost
Budget Allocations (k€)
≤ 2010
0/A
2011
A
2012
A/B1
2013
B1
2014
B2
2015
C/D
2016
C/D
2017
C/D
2018
C/D
2019
C/D
2020
C/D
> 2020
E
Total
Total
Equipment (HW / SW) and Eng. Studies
4
82
87
103
122
160
407
792
1019
500
40
20
3336
AIT / AIV, GSE and Harness
0
48
23
27
38
162
219
232
232
232
87
10
1310
Calibration and Facilities
0
25
10
25
39
65
65
65
127
85
114
90
710
Operation & Data Processing Center
0
0
0
0
0
0
0
0
50
50
197
400
697
Missions & Colloquium
20
15
26
26
35
51
51
51
51
51
51
462
893
PA / QA sub-contractors
0
65
131
131
131
131
131
131
131
131
131
720
1963
Technical Assistance sub-contractors
(CDD)
8
48
88
88
88
88
88
88
88
88
88
605
1453
Outpblic Relation
0
2
2
2
2
5
5
5
10
10
10
84
137
CNES funding (k€) - total per year
32
286
367
402
455
662
966
1364
1708
1147
718
2391
10499
French manpower cost (INSU ressources)
291,60
442,80
702,00
928,80
1000,80
1022,40
1051,20
1144,80
1177,20
1292,40
1018,80
622,80
10073
Other funding contribution (HW/SW phase
E excl.)
0,00
46,00
87,00
248,00
265,00
348,00
427,00
796,00
592,00
256,00
38,00
0,00
3103
Other funding contribution (Man power)
55,08
136,00
311,10
484,50
484,50
421,60
421,60
421,60
421,60
421,60
421,60
0,00
4001
Total non CNES (k€)
346,68
624,80
1100,10
1661,30
1750,30
1792,00
1899,80
2362,40
2190,80
1970,00
1478,40
622,80
17799
DSI – ECHOES
WBS
General duties and/or responsabilities
Payload - DSI-Echoes (DSI - I / E / F)
Project management
System engineering
PA management (including PP activities)
AIT/AIV activities
Local management (technical and product assurance)
Science working group
Public Outreach
Post-delivery support
Optics(design, tolerancies budget and manufacturing)
Optical metrology(control and metrology)
Optical analysis(MZH and parasite light)
Mechanical design(design, tolerancy budget and manufacturing)
Door design with mechanism(design, tolerancy budget and manufacturing)
Detection chain (detector , focal plane and FEE)
Calibation sub-system (design, tolerancies budget and manufacturing)
Thermal design (design, studies and manufacturing)
Main electronic unit HW (DPU and PSU - design and manufacturing)
Main electronic unit SW (software algorithm, devlopment and validation)
Proximity Electronics (design, manufacturing and qualification)
Environmental tests (thermal, humidity and EMC/ESD)
Functional and performances tests@ system level (optics, mechanisms and
electronics)
Visible calibration @ system level (facilities and integrated tests level)
Visible calibration @ sub-system level (facilities and tests)
Radiation Qualification Programme (facilities and tests)
Instrument GSE (design, upgrade and delivery)
Flight harness (design and manufacturing)
Ground segment - activities and responsibilities
Science Operation Center
(operation, science planning, quick look data visualization, data pipeline and
distribution)
Science Data Processing
(calibration and analysis software, data processing and archiving)
26
DSI ECHOES
Man Power OCA
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020 2020 + Total
Local Manager
0%
25%
30%
30%
30%
30%
30%
20%
20%
40%
40%
20%
50%
3,65
PAM / QAM
Optical Engineer (design /
architecture / Test)
Mechanical Technician (AIT OGSE / MGSE)
Testing (Func, Perfo and
Calibrations)
Software Engineer (data
processing / archiving)
Electrical Technician (AIT /
harnesss)
0%
0%
10%
10%
10%
10%
10%
10%
10%
10%
20%
10%
20%
1,30
20%
75%
75%
50%
75%
75%
75%
75%
50%
50%
50%
20%
0%
6,90
0%
0%
10%
10%
0%
0%
0%
10%
10%
0%
0%
0%
0%
0,40
0%
0%
50%
75%
75%
50%
50%
50%
50%
50%
50%
25%
200%
7,25
0%
0%
50%
50%
50%
25%
50%
25%
50%
50%
50%
50%
150%
6,00
0%
0%
10%
0%
0%
0%
0%
15%
15%
0%
0%
0%
0%
0,40
TOTAL
0,2
1
2,35
2,25
2,4
1,9
2,15
2,05
2,05
2
2,1
1,25
4,2
22,25
Phase Projet
0/A
0/A
A/B1
B2
B2
C/D
C/D
C/D
C/D
C/D
Proto
OM
EM
EM
EQM
EQM
EQM
FM
FM
C/D
FS GRM
E
Propal
A/B1
Proto A0
EJSM / DSI-Echoes
Fizeau Technical Team
Model
-
27
DSI – ECHOES
Technology Development Activity
•
Study Phase (TDAs) - ROM cost estimated to 587 k€ (2011 / 2012)
Activités
Fincancement
étranger
Fincancement français
MZH prototype
R&T (acquis : 80 k€, demandé: 90 k€)
Supp. 2012 : 50 k€ - TBC
-
Radiation (component lev.)
55 keuros
10 keuros (IFSI)
Calibration prototype
120 k€ (2 ans)
27 k€ (Luxembourg)
Detector Unit
135 k€ (2 ans) – R&T submitted
20 k€ (Luxembourg)
R&T MZ
Objectif général
Atteindre TRL 5 pour le bloc Mach Zehnder:
s’assurer de la faisabilité du composant
contrôler ses performances dans un environnement thermique représentatif du S/C.
Plan général d’actions
• Spécification du MZ
• Etude du MZ (configuration géométrique et choix des verres) et du banc de test ;
• Approvisionnement du prototype de MZ et autres composants pour le banc de tests ;
• Intégration, réalisation des tests et rapport de qualification.
Financement CNES
80 k€ 2010
90 k€ 2011-2012 (demandé)
Thése Laurence Soulat
Sujet de thèse
« Mise en œuvre d’un interféromètre imageur de
Mach-Zehnder pour la sismologie de Jupiter »
30
R&T
Schéma du banc de tests
Masque de
champ
Masque
pupille
Sortie 2
Sortie 1

Contrôle de la ddm

Mesure de qualité de front d’onde dans les 2 sorties

Contrôle de l’échantillonnage, du contraste et de la régularité des franges

Mesure de stabilité thermique de la ddm

Mesure de transmission dans les 2 voies, mesure de polarisation.
Vide
Four
Appareillage de mesure :
-analyseur de front d’onde
-optique + caméra
-polariseur + détecteur…
Contrôle de la fonction de calibration, ajustement de ddm en fonction
de T°, stabilité de la platine

R&T
Partage des responsabilités
Planning R&T MZ
R&T MZ
Manpower OCA
2010
2011
Phase A
Manpower R&T MZ DSI
-
2,35
2012
Phase B
(homme.an)
3,45
3,3
9,1
7,75
FIZEAU OCA
1,9
3
2,85
Management
Ingénierie optique
Ingénierie mécanique
Ingénierie informatique
Thèse
0,5
0,5
0,5
1
0,1
1
0,25
1
0,1
0
0,25
0,25
0,3
1
1
0,45
0,45
0,45
0,2
0,2
0,2
0,25
0
0,25
0
0,25
IAS
- Management
- Ingénierie mécanique/thermique
- Qualification environnement spatial
Total
1,35