ADAPTIVE OPTICS SYSTEMS FOR ASTRONOMY: ITALIAN INDUSTRIAL AND RESEARCH ESTABLISHMENTS
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1 ADAPTIVE OPTICS SYSTEMS FOR ASTRONOMY: ITALIAN INDUSTRIAL AND RESEARCH ESTABLISHMENTS Daniele Gallieni A.D.S. International S.r.l. JINR, Dubna, Dec.21, 2010
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3 Adaptive optics The wavefront sensor measures quantitatively the residual wavefront aberration The real time reconstructor computes the correction command for the correcting mirror A deformable mirror corrects the wavefront aberration ADAPTIVE SECONDARY CORRECTED WAVEFRONT DICHROIC ATMOSPHERIC TURBULENCE ABERRATED WAVEFRONT REAL TIME RECONSTRUCTOR WAVEFRONT SENSOR SCIENCE CAMERA
4 Adaptive optics: Italian industry and research ATMOSPHERIC TURBULENCE ABERRATED WAVEFRONT ADAPTIVE SECONDARY Original concept Scientific advisor (Optical testing) Control design Simulaiton CORRECTED WAVEFRONT REAL TIME RECONSTRUCTOR Mechanical design Mechanical manufacturing Optomechanical integration Electronic design (HW, SW) Electronics manufacturing Integration and test DICHROIC WAVEFRONT SENSOR SCIENCE CAMERA
5 Large Deformable Mirrors Less optical surfaces transmission efficiency background / IR emissivity reduced non common path aberration Large stroke AO + field stabilization + chopping on a single unit ADAPTIVE SECONDARY CORRECTED WAVEFRONT ATMOSPHERIC TURBULENCE ABERRATED WAVEFRONT REAL TIME RECONSTRUCTOR DICHROIC WAVEFRONT SENSOR SCIENCE CAMERA
6 Contactless Deformable Mirror Actuators plate Control electronics The thin mirror levitates and is actively and massively controlled by a large number of electromagnetic actuators Reference body The actuators are contactless, only magnetic forces are Response time: < 1ms Capacitive sensor armatures F transferred to the mirror The distance feedback is provided Position noise: < 3nm 40kHz by co-located capacitive sensors Magnets measuring the distance between thin mirror and reference surface Thin shell 1.6~2.0mm
7 Systems in operation: MMT336 On-sky since actuators 640mm diameter
8 Systems in operation: LBT672 Commissioned actuators 911mm diameter
9 LBT672 on-sky results Galactic center Hubble space telescope LBT
10 LBT672 on-sky results
11 Systems in construction: VLT DSM On-sky actuators 1120mm diameter
12 Future projects: ELTs E-ELT European Extremely Large Telescope ESO 42.6m primary mirror! Currently in Phase B GMT Giant Magellan Telescope Carnegie Institution for Science The University of Texas at Austin Harvard University The Australian National University Smithsonian Astrophysical Observatory University of Arizona Texas A&M University Astronomy Australia Ltd. Korea Astronomy and Space Science Institute 7x 8.4m primaries = 24.5m Currently in Phase A-B TMT Thirty Meter Telescope Association of Canadian Universities for Research in Astronomy Californian Institute of Technology University of California 30m primary mirror Currently in Phase B
13 ESO E-ELT Phase B design and prototype M2 Phase B completed actuators 2.5x2.6m mirror size (6 segments) M4 M5 M3 M1
14 ESO E-ELT Phase B design and prototype 18nm rms
15 GMT Adaptive Secondary units Phase A Phase A completed x672= 4704 actuators ~3.3m overall diameter
16 ESA Large Aperture Telescope Technology study Active petals with thin shell technology 7x 1.2m 2 petals 100 acts/m 2 Stowed Config Deployed Config
17 Starting from adaptive optics, ADS/Microgate developed other applications and components Microgate Real-time supercomputing Micro Photon Devices Single Photon Counters ADS Hexapod positioners Radiotelescopes design and control systems
18 Final remarks ADS/Microgate 15 years of fruitful cooperation with Italian scientific institutions (INAF, Politecnico di Milano) Industrial team capability cover the whole adaptive optics system from design to construction Optical components from external suppliers: opportunity of cooperation with RUS We thank the organization for this opportunity and we wish a bilateral, fruitful collaboration with RUS industry and research institutes
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