1. The SNAP Integral Field Spectrograph Overview of the project
Anne EALET
Project scientist
CPPM, CNRS (IN2P3) FRANCE

2. Overview The SNAP Spectrograph Requirements for the Spectrograph
Spectrograph concept and Status
The development plan
Risk analysis and mitigation
The demonstrator
Slicer prototype
Development plan
Manpower
Schedule
Development plan for JDEM AO
Deliverables
Summary
November 15 & 16, 2005
Anne EALET

3. The SNAP Spectrograph
November 15 & 16, 2005
Anne EALET

4. Spectrograph: Background
SNAP
imager
spectro
magnitude
M , L
ID Ia
See overview in S.Perlmutter/M.Levi talks
November 15 & 16, 2005
Anne EALET

5. SPECIFICATIONS optimized for low noise for SN up to z=1.7
A Spectrograph for SN science and SNAP calibration
optimized for low noise for SN up to z=1.7
Optimization in resolving power +sampling mainly for IR
Less constraint for the visible arm….
accurate spectro-photo calibration
psf known and mappable on all the range at 1 %
straylight, diffraction looses, calibration under control
November 15 & 16, 2005
Anne EALET

6. CONCEPT 3D spectroscopy with integral field technology:
Integral Field using the new generation of Image Slicer
Disperser=Prism for low and “constant” resolution
2 detectors (CCD, HgCdTe)
Dichroic for beam separation
INTEGRAL FIELD TECHNOLOGY:
reconstruct a DATA CUBE 3D (x,y,l) image of the sky
use a technique to rearrange the 2D (x,y)
in a 1D equivalent long slit => sliced the field
All spectral and spatial information in one exposure
Fulfills all requirements for science and space
November 15 & 16, 2005
Anne EALET

7. SNAP TOP LEVEL SCHEDULE
November 15 & 16, 2005
Anne EALET

8. Instrument design road map
Primary SNAP specifications
First requirements
Define system
requirements
Trade off
Concept definition
2002
Pre conceptual
design
Prove the feasibility
2003
Detailed simulation
Verify performances
Demonstrator
Conceptual
design
November 15 & 16, 2005
Anne EALET

9. development plan
First risk Analysis: Most critical items identification
Technological:
Slicer development
Performances
Detector performances
Calibration
Management
Management in a NASA/DOE project
Major R&D steps and risk mitigation:
Prepare an instrument concept well in phase with the SNAP instrument
Develop science Support
simulation and data reduction
Calibration scenarios
Mitigate risks = > demonstrator
November 15 & 16, 2005
Anne EALET

10. development plan procedure development Proto 0 Demonstrator
ESA slicer prototype
procedure development
November 04-June 05
Tests = July 05-Dec 05
Proto 0
January-June 06
Tests in visible and IR: July- Dec 06
Demonstrator
Demonstrator= full instrument with a new slicer under SNAP specifications
SNAP Instrument
…..
Development of the instrument
Validation of the concept with the
demonstrator

11. R&D roadmap june 05 Demonstrator design design
Nov march sept dec 05 march 06 may 06 july 06
Proto 0
meca manufa mounting test
Final
report
optical optomeca thermal/detailed manufac. mounting
design studies design
Start
tests
Demonstrator
Final
quotation
design
review
(PDR)
design
review
(FDR)
November 15 & 16, 2005
Anne EALET

12. The demonstrator
November 15 & 16, 2005
Anne EALET

13. A FIRST STEP : the PROTO 0
ESA slicer available = proto0
Optical tests in visible range in order to prepare the SNAP demonstrator are ongoing
M.H aumeunier
Allow us to prepare and test in advance all needed tools
Developement and test of software tools
Procedures (alignement, calibration)
Test plan
First simulation comparison
Definition of tools needed on the demonstrator: pupils, filters, source, calibration grid definitions etc..
First PSF results presented during this review
November 15 & 16, 2005
Anne EALET

14. Demonstrator objectives
design of a SNAP demonstration spectrograph assembly
Complete spectrograph with new slicer design built to SNAP specifications
Funded by CNES, CNRS (IN2P3/INSU), and Berkeley
include fabrication and testing
test both in room T° and cold T°
Validate and tune the simulation
Spectrograph Demonstration Slicer Unit Development:
A SNAP version slicer specified and procured from a commercial vendor: contract in place
The slicer will be tested and integrated into the demonstrator
The demonstration unit will undergo testing to verify SNAP requirements are met
November 15 & 16, 2005
Anne EALET

15. Demonstrator specifications
Prove that we meet SNAP requirements =
reconstruct an accurate psf, spatial and spectral, on the full wavelength range (visible and IR)
control the optical calibration
control distortions
control diffraction losses
control stray light
Test subsampling
test dithering strategies
validate the simulation and help us to correctly model the instrument answer.
See C.Cerna talk
November 15 & 16, 2005
Anne EALET

16. Telescope Pupil simulation
optical design : same one
Telescope
Beam
InfraRed spectrograph
Re-imaging mirror
Offner
relay
Telescope Pupil simulation
Detector plane
Demonstrator
Dichroic
Pupil & slit mirror
Slicer
Flat mirror
collimator
Prism
Camera
IR Detector
Visible spectrograph
Eric Prieto Talk
November 15 & 16, 2005
Anne EALET

17. Demonstrator design
Pierre Karst
November 15 & 16, 2005
Anne EALET

18. IR detector status IPNL : A.Castera, S.Gardien, C.Girerd,
J.C.Ianigro, R.Haroutunian, H. Mathez, G. Smadja
see G.Smadja and R.Haroutunian talks
Cryostat design sent to Rockwell: May 2005
for validation
Cryostat ready : Fev 2006
Motherboard completed Fev 2006
Software of FPGA completed : Jan 2006
Tests of readout system (bare mux) Feb 2006
Test of cryostat + readout (bare mux) march 2006
Test of H1RG in cryostat may-June 06
Readout +cryostat sent to LAM/CPPM July 2006
November 15 & 16, 2005
Anne EALET

19. Pixel simulation tuning
SNAP optical design
demonstrator optical design
Comparison of PSF:
Study effects
that modified shape
Introduction in the
SNAP simulation
Zemax
Zemax
Zernike coeff
Zernike coeff
See A.Bonissent
PSF simulation on detector
Demonstrator
PSF on detector
PSF simulation on detector
PSF (αx,αy,λ)
PSF (αx,αy,λ)
PSF (αx,αy,λ)
November 15 & 16, 2005
Anne EALET

20. Organisation LAM : optic, steering mirror, cryostat, quality
CPPM : mechanic, thermal studies, electronic, AIT/AIV, calibration , software (simulation/data reduction)
IPNL : detector, electronic, software IR with an independent test system
November 15 & 16, 2005
Anne EALET

21. R&D MANPOWER 2005 2006 Anne Ealet (CPPM) project scientist 80
Eric Prieto (LAM)
PM spectrograph 30
Pierre-Eric Blanc (LAM)
steering mirror
Charles Macaire (LAM)
Optic:/slicer
Christophe Fabron
cryostat 10 20
Franck Ducret (LAM)
quality
M .H Aumeunier ((LAM/CPPM )
PHD optic,analysis
100
Cédric Cerna (CPPM)
System engineering
Pierre Karst (CPPM)
Mechanic engineering
Jean Luc Gimenez(CPPM)
Mechanic
Alain Bonissent (CPPM)
Simulation/ Data reduction
André Tilquin (CPPM)
Data analysis
Gerard Smadja (IPNL)
leader IR detector
Claude Girerd (IPNL)
Detector IR Acquisition 40
Alain Castera (IPNL)
PM IR detector
Roger Harouturian (IPNL
IR CRYOSTAT
Jean Christohe Ianigro (IPNL)
IR cryostat
November 15 & 16, 2005
Anne EALET

22. Demonstrator schedule
2005
2006
Demonstrator design
Demonstrator building
assembly
IR test design and build
Warm test
H1RG test
Cold test
Slicer unit : design and build
Steering mirror : calibration, build and tests
November 15 & 16, 2005
Anne EALET

23. Development plan for AO
From R&D activities
Demonstrator results
R&D activities on detectors and validation
risk assessments (technological, manufacturing, integration, calibration, characterization)
To the development of the SNAP instrument plan
Develop conceptual design
Develop integration & test plans
Performance specifications & tolerance analysis
Develop a model philosophy
Develop preliminary cost & schedule ranges
Develop preliminary interface control specifications/documents
Develop a management plan (WBS, organisation structure, assurance plan) support from ASTRIUM
November 15 & 16, 2005
Anne EALET

24. Conceptual development
Scientific and technical requirements
Design see P.E Blanc talk
Optical development: design, tolerance studies
Structural :Trade on the structure, choice ,opto-mechanical studies
Thermal :modal and thermo-elastic analysis
Focal Plane
Review of detectors/technologies –choice
Detector optimization with provider
Early focal plane development
Slicer
SNAP demonstrator
Verification of performances
Calibration procedures studies
Software development : simulation and data processing
Interface control requirement
November 15 & 16, 2005
Anne EALET

25. Spectrograph: R&D deliverables
Status
deliv
Performance requirement
Under work
draft
Detector requirement
Calibration procedures studies
Operation concept
Started
Instrument pre-concept
Done
Optical and structural development
June 06
Focal plane development plan
Dec 06
Thermal and elec. development
Conceptual design report/review
Slicer prototype ESA report
done
Demonstrator warm tests
Oct 06
Demonstrator cold tests
Detector electronic/test
Simulation development
code
Reconstruction development
Pre Cost and management study
started
Mar 06
Final cost , management study
November 15 & 16, 2005
Anne EALET

26. Futur Status of the spectrograph?
R et D studies since will go up to 2007 with
Slicer, Demonstrator, Electronic, Simulation activities
The demonstrator is a key point of this development to be ready for the JDEM /NASA proposal with a strong expertise and a complete development and management plan.
FUTUR:
A French spectrograph ?
Our strong points:
Slicer Technology
System (simulation and calibration)
Integration in the project
The demonstrator for performances validation
November 15 & 16, 2005
Anne EALET

27. Summary
November 15 & 16, 2005
Anne EALET

28. SPARE
November 15 & 16, 2005
Anne EALET

29. Design constraints Y(slice) l X (pixel) REQUIREMENTS for space:
Compactness
Reflective optics
No accurate slit positioning
All information in one exposure
High throughput
3D spectroscopy for galaxy +SN
INTEGRAL FIELD TECHNOLOGY:
reconstruct a DATA CUBE 3D (x,y,l) image of the sky
use a technique to rearrange the 2D (x,y)
in a 1D equivalent long slit => sliced the field
Trade-off l
Y(slice)
X (pixel)
November 15 & 16, 2005
Anne EALET