IFU Management Meeting LAM – 15/10/04

Introduction (olf)

Recall of the development History (Olf) Pour info – coût prototype: Pour info – coût prototype: ~6 my : 360k€ ~6 my : 360k€ Vacuum chambers; vibration tools: ??? Vacuum chambers; vibration tools: ??? ~150k€ hardware ~150k€ hardware Test equipment: ~30k€ Test equipment: ~30k€ Travel: ? Travel: ? Total: ~600k€ (ESA funding : ~300k€) Total: ~600k€ (ESA funding : ~300k€)

Lessons Learned from the prototype development R&T development spirit of LAM Team where the contract was more fly hardware delivery type ( ESA did not refocus during the study) R&T development spirit of LAM Team where the contract was more fly hardware delivery type ( ESA did not refocus during the study) Small experience in structural dynamic analysis Small experience in structural dynamic analysis CNRS difficulties to manage industrial kind of contract CNRS difficulties to manage industrial kind of contract Laboratory has no autonomy Laboratory has no autonomy  The prototype is finished and the core technology is validated

How to move for the NIRSPEC-IFU development Needs of phase B/C/D industrial management type Needs of phase B/C/D industrial management type Needs of high level reference support for dynamical analysis study Needs of high level reference support for dynamical analysis study CNRS administration constraint not adapted for industrial sub-contract CNRS administration constraint not adapted for industrial sub-contract  Refocusing on our core activities

Slicer Principle 1.Field divided by slicing mirrors in subfields telescope pupil on the pupil mirrors 2.Aligned pupil mirrors 3.Sub-field imaged along an entrance slit How to rearrange 2D field to enter spectrograph slit: Courtesy: JR Allington Smith

Entrance Pupil Slicer mirror Pupil mirrors Slit Mirrors Slicer unit optical design for the IFS

Radius of curvature: ~ 150 mm Tilt in Y: +/- 3.7° Tilt in X: from 3.3 to 9° Thickness: 900 µm Width: 27 mm Slicer unit optical design for the IFS

300µm Pupil mirror pitch: mm Pupil oversizing in spectrograph: <2 Tilt Y: +/- 3.7° Tilt X: 3.65° –> 6° Curvature Radius: ~24.5mm Slicer unit optical design for the IFS: pupil mirror

500µm Pitch: mm Curv. radius: 26.5 mm Tilt Y: 0° Tilt X: 6.5° Slicer unit optical design for the IFS: slit mirror

Design Overview Active Stack Heel Stack support Steering mirror Pupil mirror array Slit mirror array Main structure Substructure Thrust cylinders Dummy Stack

The prototype as built

Slicer Stack Clamps 18 dummy slices 10 Active slices 2 Dummy slices Clamp

Mirrors lines

Tests

Results Highlights

Manufacture and integration

Ensquared energy

Crosstalk +/-40µm relative for a specification of +/- 120µm

Slits separation Plots of the intensity profiles in the regions between the pseudo-slits. Lowest contour in the plots corresponds roughly to ~1% of the peak intensity (50 for a peak intensity of ~3000).

Lessons

Prototype critical points Critical point Validation Fabrication of optical subsystem (slices, assembly, specifications) YES Vibration compliance of the sub-system YES Thermal compliance (+cycling) of sub-system YES

Prototype critical points Optical performances (PSF, Alignement, slit function,…) YES (alignement not checked after vibration) Mouting and alignment at operating temperature YES Vibration Compliance of the system Survival (Opto-mechanical defect) Thermal compliance (+cycling) of sub-system YES

ESA ASTRIUM concern ESA and Astrium presentation ESA and Astrium presentation

Technical Baseline (PeB/PD/JLB)

Industrial Team (Olf)

WBS (ASTRIUM)

Share of work and responsibilities

Related Experience (Olf)

LAM Project Team (Olf)

Design & development approach Phase B: Phase B: Design Design Analysis (optical performance, stray light analysis, structural static and dynamic, thermal) Analysis (optical performance, stray light analysis, structural static and dynamic, thermal) Test Plan preparation Test Plan preparation Technological development: Technological development: 30+3 optical bonding release (for statistical approach) 30+3 optical bonding release (for statistical approach) 30+3 Hydroxil bonding release 30+3 Hydroxil bonding release 40 slices stack with optical bonding (vibration, thermal, shock) 40 slices stack with optical bonding (vibration, thermal, shock) 40 slices stack with Hydroxil bonding (“”) 40 slices stack with Hydroxil bonding (“”) Opto-mechanical mount for pupil lines (thermal, vibration, shock) Opto-mechanical mount for pupil lines (thermal, vibration, shock) Opto-mechanical mount for flat folding mirror (thermal, vibration, shock) Opto-mechanical mount for flat folding mirror (thermal, vibration, shock)

Design & development approach Phase C/D: Phase C/D: STM: for dynamical model calibration, opto-mechanical demonstrator verification, and delivery at Astrium STM: for dynamical model calibration, opto-mechanical demonstrator verification, and delivery at Astrium EQM: end to end optically functional for 9 channels, structural fully representative, interface representative; qualification in vibration, optical performance at operating temperature, thermal cycling, and shock EQM: end to end optically functional for 9 channels, structural fully representative, interface representative; qualification in vibration, optical performance at operating temperature, thermal cycling, and shock FM: Environmental tests at acceptance level, acceptance optical test at operation temperature, characterization at operating temperature FM: Environmental tests at acceptance level, acceptance optical test at operation temperature, characterization at operating temperature

Model Philosophy

Technology development plan 33 samples of pupil mirrors optical bonded: 33 samples of pupil mirrors optical bonded: 33 acceptance tests 33 acceptance tests 33 cryo cycling (22°K) 33 cryo cycling (22°K) 30 tests up to release at atmosphere pressure 30 tests up to release at atmosphere pressure 3 tests up to release in vacuum 3 tests up to release in vacuum 33 samples of pupil mirrors hydroxil bonded: 33 samples of pupil mirrors hydroxil bonded: 33 acceptance tests 33 acceptance tests 33 cryo cycling (22°K) 33 cryo cycling (22°K) 30 tests up to release at atmosphere pressure 30 tests up to release at atmosphere pressure 3 tests up to release in vacuum 3 tests up to release in vacuum

Technology development plan 40 slices stack optical bonded: 40 slices stack optical bonded: 15 thermal cycling (survival - IFU-284) 15 thermal cycling (survival - IFU-284) Vibration qualification tests (survival - specification?) Vibration qualification tests (survival - specification?) Shock tests (survival - specifications?) Shock tests (survival - specifications?) 40 slices stack hydroxil bonded: 40 slices stack hydroxil bonded: 15 thermal cycling (survival - IFU-284) 15 thermal cycling (survival - IFU-284) Vibration qualification tests (survival - specification?) Vibration qualification tests (survival - specification?) Shock tests (survival - specifications?) Shock tests (survival - specifications?)

Technology development plan Opto mechanical mount of pupil mirror lines on INVAR: Opto mechanical mount of pupil mirror lines on INVAR: Representative zerodur support (similar mass than support plus pupil mirror) Representative zerodur support (similar mass than support plus pupil mirror) Opto-mechanical mount (representative) Opto-mechanical mount (representative) Vibration test (survival - specifications?) Vibration test (survival - specifications?) Thermal cycling (survival - IFU-284) Thermal cycling (survival - IFU-284) Shock test (survival - specifications?) Shock test (survival - specifications?) Opto mechanical mount of folding mirror: Opto mechanical mount of folding mirror: Representative element Representative element Opto-mechanical mount (representative) Opto-mechanical mount (representative) Vibration test (survival - specifications?) Vibration test (survival - specifications?) Thermal cycling (survival - IFU-284) Thermal cycling (survival - IFU-284) Shock test (survival - specifications?) Shock test (survival - specifications?)

Product Breakdown / procurement approach Image slicer: Image slicer: Slicer unit + pupil line + slit line Slicer unit + pupil line + slit line No opto-mechanical mount No opto-mechanical mount Test structure for Test structure for Folding mirror: Folding mirror: Mirror plus opto-mechanical mount Mirror plus opto-mechanical mount Test Test Toroidal mirrors: Toroidal mirrors: Two mirrors together Two mirrors together Optomechanical mount Optomechanical mount Test structure for Test structure for Structure: Structure: STM: refurbishing after tests STM: refurbishing after tests EQM + FM + Spare: to the same company EQM + FM + Spare: to the same company

Verification approach Sub system acceptance: Sub system acceptance: Slicer, mirror lines: vibration (level?) + thermal cycling Slicer, mirror lines: vibration (level?) + thermal cycling Folding mirror + mount: vibration (level?) + thermal cycling + Folding mirror + mount: vibration (level?) + thermal cycling + Toroidal mirrors: optical performances mounted Toroidal mirrors: optical performances mounted Slicer + pupil +slit: optical performance Slicer + pupil +slit: optical performance

Verification approach EQM: EQM:

Verification approach FM: FM:

Planning KO: Nov 30th KO: Nov 30th PDR: Sept 05 PDR: Sept 05 … a remplir avec le SOW que j’ai pas… michel? … a remplir avec le SOW que j’ai pas… michel?