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SAM – SOAR Adaptive Module

SAM – SOAR Adaptive Module. Andrei Tokovinin Nicole van der Bliek. SAM = SOAR Adaptive Module. 1:1 SAM focus feeds: -Visitor Instrument (SIFS) -Built-in CCD imager. SAM corrects ground-layer turbulence with a UV Laser Guide Star. G round L ayer A daptive O ptics.

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SAM – SOAR Adaptive Module

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  1. SAM –SOAR Adaptive Module Andrei Tokovinin Nicole van der Bliek OC, June 3, 2004

  2. SAM = SOAR Adaptive Module 1:1 SAM focus feeds: -Visitor Instrument (SIFS) -Built-in CCD imager SAM corrects ground-layer turbulence with a UV Laser Guide Star OC, June 3, 2004

  3. GroundLayerAdaptiveOptics Seeing-limited (>90% of ground-based astronomy!) Better seeing in wider field • GLAO works in the visible • Complete sky coverage = Diffraction limit (full AO or MCAO) OC, June 3, 2004

  4. Science with SAM • Dynamics of galaxies, AGNs (+SIFS or F-P) • Stellar populations, clusters (confusion!) • Supernovae, Cepheids • Weak lensing • ISM (PNe, jets) and more… GLAO benefits “classical” astronomical programs OC, June 3, 2004

  5. Performance: FWHM on-axis 2x SAM improves the “seeing” by 2-5 times 5x Based on real turbulence profiles at Cerro Pachon ! OC, June 3, 2004

  6. The whole FOV is well compensated corner PSF contours 0.1--0.5--0.9 of max at different locations in the 3’x3’ FOV for a representative turbulence profile (80% near the ground) center OC, June 3, 2004

  7. SAM in numbers OC, June 3, 2004

  8. SAM • All-reflective • Excellent quality • Collimated space OC, June 3, 2004

  9. Electronics OC, June 3, 2004

  10. Software OC, June 3, 2004

  11. Turbulence Simulator Developed by Sandrine Thomas – a PhD student working on SAM Use: instrument control and optimization, Software development Soon: closed-loop in real time with TurSim and SAM SW OC, June 3, 2004

  12. Systems engineering is considered seriously • LGS: “set-and-forget”? Rugged industrial laser, no airplane/space hazards • NGS for tip-tilt: automatic acquisition • Loop optimization, PSF prediction • Built-in turbulence simulator • Smooth interaction with the telescope Goal: build an easy-to-use AO instrument OC, June 3, 2004

  13. Andrei Tokovinin - project scientist Nicole van der Bliek – project manager Brooke Gregory – project scientist Sandrine Thomas - PhD student Patricio Schurter – mechanical engineer Rolando Cantarutti – software engineer Eduardo Mondaca – electronics engineer SAM team OC, June 3, 2004

  14. Project Organization • Project Manager, Project Scientists / Systems Engineers, Lead Mechanical, Electronic and Software Engineers, plus a PhD student • Review process • External CoDR*, delta-CoDR*, PDR • Internal reviews of subassemblies • WBS, project plan & design notes • Support on project management aspects from Tucson MIP staff OC, June 3, 2004 * Passed successfully

  15. A phased project • Phase 0 – Concept development complete 1:1 corrected image delivered to SOAR instruments Focus is on LGS wide field mode Collimated space included for future Fabry-Perot • Phase 1 – NGS AOunder way • AO module, incl. Tip-tilt • Phase 2 – LGS AO next step • Laser • Beam transport optics and launch telescope OC, June 3, 2004

  16. Project statusJune 2004 • Successfully passed delta-CoDR last January • Advancing in Phase 1 • Milestones since delta-CoDR • 11 reached • 8 left before PDR • PDR to be held in Aug/Sept. OC, June 3, 2004

  17. After PDR – Finishing Phase 1 Design, plan, procure, fabricate Ready for assembling sub-systems mid FY05 Assemble, test & commission Start commissioning end FY05 / beginning FY06 And on to Phase 2 LGS system Procure, fabricate, assemble, test & commission OC, June 3, 2004

  18. Management issues • Balancing shared resources SOAR commissioning, other support tasks within NOAO • Pacing of project in line with NOAO budget • SOAR Interfaces e.g. ISB cage modifications • Aspects of the planning process Ensure sufficient time for studies of various tradeoffs OC, June 3, 2004

  19. Concluding remarks • Direct impact of SAM: • Enhanced capability of SOAR 0.7”  0.3”, for 3’ FOV • Proving GLAO: important NOAO contribution to community • Challenges for NOAO South: set & meet reasonable expectations w/r to performance, budget & schedule • moderately big project, fairly high visibility for NOAO South • scientific and technical resources are in-house • And for Greater NOAO • Increase AO expertise within NOAO • A successful SAM will enhance NOAO’s capacity to produce future instrumentation for large telescopes OC, June 3, 2004

  20. OC, June 3, 2004

  21. Milestones reachedJune 2004 • Successfully passed δ-CoDR • DM selected & ordered • Optical design frozen • Studies of concept tradeoffs finished: • Pockels Cell vs Gated CCD • Launch telescope concept • Modelling of tt guide star requirements • Comparison of analytical/Monte Carlo models • Comparison APDs and PMTs for TT sensors • Completed & tested TurSim • Reconstructor algorithm implemented • Implementation of DAC control for DM OC, June 3, 2004

  22. Before PDRAug/Sept 2004 • Close loop in lab • Design AO module housing • Tolerance and specify optics • Detail WFS design • Design Laser Launch Telescope, Beam transfer optics (preliminary) • Prepare alignment plan • Elaborate science case • Plan Phase 2 Tasks can be carried out in parallel OC, June 3, 2004

  23. After PDR – Finishing Phase 1FY05 • Design, plan, procure, fabricate • Procure optics • Complete design and fabricate module • Detail alignment plan • Prepare Integration & Test plan • Plan commissioning • Detail design of laser system • Assemble, test & commission • Test core AO system in laboratory • Test subassemblies and software modules (some in parallel) • Integrate & align complete instrument • Test in lab • Commission @ telescope => end FY05/beginning FY06 OC, June 3, 2004

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