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SAM –SOAR Adaptive

Module

SAM –SOAR Adaptive

Module

Andrei TokovininNicole van der Bliek

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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

OC, June 3, 2004 9Electronics

Electronics

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Software

Software

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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