Presentation on theme: "MACAO-VLTI Adaptive Optics"— Presentation transcript:
1 MACAO-VLTI Adaptive Optics 4/6/2017Other Contributors:L. Close,J. Brynnel,J. Farinato,E. Brunetto,S. Stroebele,R. Reiss,E. Marchetti,D. Bonaccini CaliaT. Craven-Bartle,M. Comin,T. Phan Duc,Wallanders…R. Arsenault, R. Donaldson, C. Dupuy, E. Fedrigo, M. Kasper, N. Hubin, B. Delabre, S. Oberti, J. Paufique, L. Ivanescu, S. Tordo, S. Rossi, A. Silber, J.-L. Lizon, P. Gigan, M. Quattri20th AO ESO
2 MACAO-VLTI: How it started… Challenges… 4/6/2017MACAO-VLTI: How it started… Challenges…Low cost - reliable – easy to operate AO systemPolyvalent: feed VLTI, CRIRES, SPIFFI…Few curvature system in world (IoA Hawaii, CFHT)Believers/Architects: F. Roddier, G. Monnet, F. RigautAO Group restructure 1999Fast track !!! (thanks to team !)(FDR-4th Macao: 4 yrs)Low Maintenance - easy to operate(automatic: guide str mag. & seeing LUT)Understand Curvature system…Detailed simulations & test in EuropePiston Spec.New for AO systems; no real time feedback; open loop process…DM mech. decoupled from WFSM8 location 5m above WFS !!! Decoupled structure
8 MACAO-VLTI: Optics WFS Optics Functions Membrane vibration for curvature sensing (2.1 kHz)Beam collimationPupil enlargment (14 18 mm)Pupil imaging on LensletPupil centering on LensletPupil de-rotationCRITICALRotating prism axisGimball tilt
9 MACAO-VLTI: Industries Applied Physics Specialties, Ltd. 17 Prince Andrew Place Don Mills, Ontario M3C 2H2 CanadaDR. SCHÜTTEN GmbHDr.-Ing. Rudolf Schütten(Geschäftsführer)Frauenfelderstr. 95CH-9548 MatzingenShaktiware
10 MACAO-VLTI: Lab Tests Optical Table in Lab. 038 Simulated f/47 Coude beamPhase screens & turbulence generatorDM in optical beamWFS mounted under opt. tableRASOIR IR test camera
11 MACAO-VLTI: Paranal Installation Five (5) comm. (inclu. TTB) from Dec.’01 to Mar.05Required >140 man-day/comm, 20 k € /comm transport, 15 k € overtimeShipment/comm: 10 crates, 3 tons, 15 m3, value 1.4 M€All together ~8 staff monopolized for 1.5 monthsPreparation: Hand & power tools, handling tools, books, docum., laptops, soft …Lots of constraints before scheduled dates (calibr., scien. op. etc.)Paranal overloaded with operation Limited Paranal prep. before arrival; but outstanding response once thereHeavy toll on staff (assume 2wks off after comm. or “low-profile”); one wk – 10 days on sky about limit of exhaustion!Data reduction & Comm. Report prep. and writing not evaluated yet (2-3 wk/staff ?!) + Documentation to provide…The Right stuff!
13 MACAO-VLTI: Calibrations 4/6/2017MACAO-VLTI: CalibrationsMembrane Mirror Stroke CalibrationRoC vs Volt; FOV of WFS for given RoC and TiltMembrane Mirror Phaselag CalibrationUse tilt signal; for which phaselag curv =0; add 180ºInteraction Matrices Calibration~6 matrices for different RoC; interpolation to cover whole rangeDM Flattening (close loop with low gains; re-iterate)Influence Functions (Piston; laboratory)DM shape+Capa. Sensor (OPD offset); DM non-linearitySee paper on Calibrations Oberti, Bonnet, Fedrigo et al.See paper on Piston Ivanescu, Arsenault, Fedrigo et al.Worry about DM far from WFSAfter install and work in Coude LOTS of turbulenceBeginning of night some turbulenceMiddle of night after good ventilation rock steady !!!
14 MACAO-VLTI System Description Coude Room ViewFront: ITC rack, M9 tower, Macao on XY tableBack: Elec. Cab, APD rack, FOB, M9 cooling, SCP(For system description see Arsenault et al., 2003, SPIE 4839, p.174)Test Bench & Turbulence Generator
15 MACAO-VLTI Performance: Results on UT2 HIC V=10Sep ” Seeing 0.75”5 x 5 arcsec2 K-band image of "Frosty Leo" obtained in 0.7 arcsec seeing. V~ 11, difficult AO target because 3 arcsec in size at visible wavelengths. The corrected image quality is about FWHM 0.1 arcsec.Open-loopClose-loop90-second K-band exposure of the central 6 x 13 arcsec2 around the Galactic Center obtained by under average atmospheric conditions (0.8 arcsec seeing). Although the 14.6 magnitude guide star is located roughly 20 arcsec from the field center the present image has a point-source FWHM of about arcsec.
16 MACAO-VLTI: Results UT3 Mars image taken in August 8th 2003Some ~20 mosaic images in K bandReference source: DeimosWFS offsets(excellent “exercise” for MACAO-VLTI functionalities)(thanks to MKA & STO)Neptune H band imagePlanet disk used for guiding (f=3”)Smallest features ~0.067”
17 MACAO-VLTI: Results on UT3 Interferometry Calibrator fringes HD20356 with 2 MACAO’s on UT2-UT3 November ‘031st fringes with 2 MACAO’s on UT2-UTFlux injected in VINCI fibers (beam combiner) versus MACAO-VLTI main loop gain. Approximately 50 times more flux injected with MACAO than with tip-tilt correction alone.
18 MACAO-VLTI: Results UT4 Tilt Correction 4/6/2017MACAO-VLTI: Results UT Tilt CorrectionNasmyth A/R failed;Exchanged with UT1Bad Active correction first; MKA wants to correct it all with MACAO !!!
20 MACAO-VLTI Performance: Strehl versus V magnitude 4/6/2017MACAO-VLTI Performance: Strehl versus V magnitudeLegend:Pink diamonds: VLTI specificationsBlue curve: Computer simulationsRed Curve: Test Bench (lab.) measurementsBrown dots (error bars): Sky data on UT2 (April’03; lower limit ‘cause seeing > spec.)Black squares: Sky data on UT3 (August’03)Red dash-dot line: open loop strehlStrehl ratio versus guide star magnitude
21 MACAO-VLTI Performance: Piston-control freq. influence 4/6/2017MACAO-VLTI Performance: Piston-control freq. influencePiston Removal:a)Determine piston modeb)Given act. V, calibrate piston over pupilc)Apply piston corr. V for each V (350 Hz)Non-Linear double iterationSee paper Ivanescu et al. for details
22 MACAO-VLTI MACAO-VLTI Upgrades ITF Electronics cabinets vibrations: move out end-2006 (in progress; Paranal Eng.)Membrane mirror phaselag switch solved (noise on APDCM); upgrade of EPROM’sRTC Anti-WindupFINITO injection (ITF):Delay Lines alignment + VCM use; procedureSource centering on Fiber; dynamic modulationTunnel Seeing: IRIS (+actuator pre-instrument!?)PSF “explosion”: implementation of SMA+Anti-WindupUT Vibrations: implementation of VTK algorithm
23 MACAO-VLTI: Conclusions 4/6/2017MACAO-VLTI: ConclusionsMilestonesTTB (STRAP) Dec. ’01First closed loop lab. Aug.’02First closed loop skyFirst fringesEnd project 2005Delivery of systems on scheduleAll functionalities operational and tested in telescope environmentStrehl Ratio Performance above spec. S~60% bright sources (seeing 0.8”); S~25% V~15.5 (seeing 0.6”)Residual tip-tilt 5-9 mas for bright sourcesSimilar performance on all UT’s (homogeneous systems)Automatic acquisition through VLTI ISS templatesPerf. Tested at Coude focus (not including delay lines)