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JWST/IFS Prototype

JWST/IFS Prototype. Final Presentation 23/09/2004 ESTEC - Noordvijk. Consortium. LAM: Eric Prieto Charles Macaire Pierre-Eric Blanc Gabriel Moreaux Andrée Laloge CRAL: Florence Laurent Pierre Ferruit Daniel Robert University of Durham: David Robertson Jurgen Schmoll

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JWST/IFS Prototype

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  1. JWST/IFS Prototype Final Presentation 23/09/2004 ESTEC - Noordvijk

  2. Consortium • LAM: • Eric Prieto • Charles Macaire • Pierre-Eric Blanc • Gabriel Moreaux • Andrée Laloge • CRAL: • Florence Laurent • Pierre Ferruit • Daniel Robert • University of Durham: • David Robertson • Jurgen Schmoll • Marc Dubbeldam NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  3. Agenda • General presentation of the prototype (optics, mechanics) • Presentation of the CCN activities • Presentation of the vibration test and results • Presentation of the Cryo-tests and results • General discussions NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  4. Introduction • ESA funded prototyping work • JWST/NIRSPEC development • Previously MEMS back-up • Currently IFU option • Collaboration LAM/CRAL/DURHAM • Aim: Technical Readiness Level 6 NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  5. 4 1 3 2 Slicer Principle How to rearrange 2D field to enter spectrograph slit: • Field divided by slicing mirrors in subfields telescope pupil on the pupil mirrors • Aligned pupil mirrors • Sub-field imaged along an entrance slit Courtesy: JR Allington Smith NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  6. Prototype Definition

  7. Pupil mirror array Dummy Stack Slit mirror array Active Stack Heel Stacksupport Thrust cylinders Substructure Steeringmirror Main structure Design Overview NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  8. Reality NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  9. Clamp Slicer Stack 2 Dummy slices 10 Active slices 18 dummy slices Clamps NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  10. pupil/slit mirrors lines Opto-Mech. Mount 5 Pupil Mirrors Glass Bar • Back-up solution from monolithic solution NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  11. But

  12. New proposition of design NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  13. New proposition of design • 5 active mirrors • 10 dummies • Stress on monolithic bar • Grooves for surface stress NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  14. The prototype as built NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  15. PSF measurement • PSF’s Shape •  = 577 nm PSF (Best focus) on slit mirror 21 • The 4 green squares : pixels of 40 µm equivalent • The small yellow square : area of 80 % encircled energy NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  16. Results Highlights

  17. Ensquared energy NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  18. Crosstalk +/-40µm relative for a specification of +/- 120µm NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  19. 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). NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  20. Conclusion

  21. Conclusion • Prototype shows: • Good optical quality (@ room and cryo T°) • Very good pupils and sub-slits positioning • Opto-mechanics shows: • Compatibility to room and 30°K environment • Optical contact qualified NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

  22. Further activities (outside the current contract • Qualification: • Up to the end of the year: NASTRAN model to simulate the dynamic response • Optical performance: • Slit function (from current data) • More • Precise crosstalk measurement (@ room T°) NIRSpec/IFU Prototype Final Presentation ESTEC - Noordwijk

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