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

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

The SNAP Spectrograph November 15 & 16, 2005 Anne EALET

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

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

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

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

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 2004-2006 Conceptual design November 15 & 16, 2005 Anne EALET

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

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

R&D roadmap june 05 Demonstrator design design Nov 04 march 05 sept 05 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

The demonstrator November 15 & 16, 2005 Anne EALET

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

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

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

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

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

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

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

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

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

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

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

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

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

Futur Status of the spectrograph? R et D studies since 2001 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

Summary November 15 & 16, 2005 Anne EALET

SPARE November 15 & 16, 2005 Anne EALET

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