OC, June 3, 2004 1
SAM –SOAR Adaptive
Module
SAM –SOAR Adaptive
Module
Andrei TokovininNicole van der Bliek
OC, June 3, 2004 2
SAM = SOAR Adaptive Module
SAM = SOAR Adaptive Module
1:1 SAM focus feeds: -Visitor Instrument (SIFS)-Built-in CCD imager
SAM corrects ground-layerturbulencewith a UV Laser Guide Star
SAM corrects ground-layerturbulencewith a UV Laser Guide Star
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GroundLayerAdaptiveOptics
GroundLayerAdaptiveOptics
Seeing-limited (>90% of ground-based astronomy!)
=Better seeingin wider field
Diffraction limit
(full AO or MCAO)
GLAO works in the visible
Complete sky coverage
GLAO works in the visible
Complete sky coverage
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Science with SAMScience 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 GLAO benefits “classical” astronomical programs
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25% 50% 75%
β,” 0.94 1.11 1.33
0.5μm 0.38 0.53 0.71
0.7μm 0.22 0.31 0.49
1μm 0.17 0.22 0.30
Based on real turbulence profiles at Cerro Pachon !Based on real turbulence profiles at Cerro Pachon !
Performance: FWHM on-axis
Performance: FWHM on-axis
2x
5x SAM improves the “seeing”by 2-5 times
SAM improves the “seeing”by 2-5 times
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The whole FOV is well compensated
The whole FOV is well compensated
PSF contours 0.1--0.5--0.9 of maxat different locations inthe 3’x3’ FOV for a representativeturbulence profile (80% near the ground)
PSF contours 0.1--0.5--0.9 of maxat different locations inthe 3’x3’ FOV for a representativeturbulence profile (80% near the ground)
center
corner
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SAM in numbersSAM in
numbersDM Bimorph, 50mm pupil, 60 electrodes
WFS S-H 9x9, CCD-39 pixel 0.35”, 8x8
Laser Tripled Nd:YAG 355nm, 8W, 10 kHz
LLT D=30cm, behind secondary, H=10km
Gating KD*P Pockels cell, dH=150m
Tip-tilt Two probes, fiber-linked APDs, R<18
Focal plane 3’x3’ square, 3 arcsec/mm, f/16.5
CCD imager 4Kx4K, 0.05” pixels, 6 filters
Coll. space 50mm beam, 120mm along axis
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SAMSAM
All-reflectiveExcellent qualityCollimated space
All-reflectiveExcellent qualityCollimated space
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Turbulence Simulator
Turbulence Simulator
Developed by Sandrine Thomas – a PhD student working on SAM
Developed by Sandrine Thomas – a PhD student working on SAM
Use: instrumentcontrol and optimization,Software development
Soon: closed-loop in real time with TurSim and SAM SWSoon: closed-loop in real time with TurSim and SAM SW
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Systems engineering is considered seriously
Systems engineering is considered seriously
LGS: “set-and-forget”? Rugged industrial laser, no airplane/space hazards NGS for tip-tilt: automatic acquisitionLoop optimization, PSF predictionBuilt-in turbulence simulatorSmooth interaction with the telescope
Goal: build an easy-to-use AO instrumentGoal: build an easy-to-use AO instrument
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SAM teamSAM team
Andrei Tokovinin - project scientistNicole van der Bliek – project managerBrooke Gregory – project scientist Sandrine Thomas - PhD studentPatricio Schurter – mechanical engineerRolando Cantarutti – software engineerEduardo Mondaca – electronics engineer
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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
* Passed successfully
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A phased project
• Phase 0 – Concept development complete1:1 corrected image delivered to SOAR instruments
Focus is on LGS wide field mode
Collimated space included for future Fabry-Perot
• Phase 1 – NGS AO under way– AO module, incl. Tip-tilt
• Phase 2 – LGS AO next step– Laser– Beam transport optics and launch telescope
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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.
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After PDR – Finishing Phase 1
Design, plan, procure, fabricateReady for assembling sub-systems mid FY05
Assemble, test & commissionStart commissioning end FY05 / beginning FY06
And on to Phase 2LGS system
Procure, fabricate, assemble, test & commission
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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 processEnsure sufficient time for studies of various tradeoffs
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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
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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
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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
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After PDR – Finishing Phase 1
FY05• 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
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