1 A A First-Light AO system for First-Light AO system for LBT AGW Unit LBT AGW Unit : a conceptual : a conceptual design design S. Esposito, M. Accardo, C. Baffa, V. Biliotti, G. Brusa, M. Carbillet, D. Ferruzzi , L. Fini, I. Foppiani, A. Puglisi, P. Stefanini, R. Ragazzoni, P. Ranfagni, A. Riccardi, A. Tozzi, C. Verinaud, R. Biasi D. Gallieni, W. Seifert, J.Storm Presented by: S. Esposito Tucson, December 9 th 2001
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A First-Light AO system for LBT AGW Unit : a conceptual design
A First-Light AO system for LBT AGW Unit : a conceptual design. S. Esposito, M. Accardo, C. Baffa, V. Biliotti, G. Brusa, M. Carbillet, D. Ferruzzi , L. Fini, I. Foppiani, A. Puglisi, P. Stefanini, R. Ragazzoni, P. Ranfagni, A. Riccardi, - PowerPoint PPT Presentation
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A A First-Light AO system for First-Light AO system for LBT AGW UnitLBT AGW Unit: a conceptual design: a conceptual design
S. Esposito, M. Accardo, C. Baffa, V. Biliotti, G. Brusa, M. Carbillet, D. Ferruzzi , L. Fini, I. Foppiani, A. Puglisi, P. Stefanini, R. Ragazzoni, P. Ranfagni, A. Riccardi,
A. Tozzi, C. Verinaud, R. Biasi D. Gallieni, W. Seifert, J.Storm
Presented by: S. EspositoTucson, December 9th 2001
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The DM, Adaptive Secondary (LBT672)
AO system for LBT AGW: SummaryAO system for LBT AGW: Summary
AO System Integration and Testing
AO System Objectives
Real-Time loop control
The WFS unit, pyramid sensor
Time schedule, costs and manpower
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System main Objectives System main Objectives
Very high correction with bright reference sources• High number of actuators 672• High pupil sampling 32x32 (CCD39), 60x60 (CCD60)
Maximized Sky Coverage• High sensitivity of Pyramid Sensor• High transmittance of the WFS optics• no RON with CCD60
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LBT AO System: DMLBT AO System: DM
MMT Adaptive Secondary
VANES22mm x 14mm
• Adaptive secondary for LBT• 672 actuators• Tip-tilt and HO correction• Wavefront reconstructor on-board
911mm
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A Moveable WFS for the AGW unit A Moveable WFS for the AGW unit 2020thth October 2001 October 2001
• Reduce size, number and cost of optical elements• High optical throughput• Minimize NCP aberrations• Reduce system flexure• Reduce turbulence WFS optical path• Easy assembly and testing the WFS unit• Same HO & TT reference star
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LBT AO System: WFSsLBT AO System: WFSs
LGS (Sodium) WFS HOsmall 120x100x100 mm,200mm refocuseable unit
NGS WFS HO&TT small 300x400mm,moveable unitacquiring +/- 60 arcsec FOV
F15 beam from LBT
Instrument entrancewindow 15o
derotator unit
Instrument flange
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A Moveable A Moveable NGS NGS WFS for the AGWWFS for the AGW
F15 beam from LBT
Instrument entrancewindow 15o
derotator unit
NGS WFS HO&TT small 300x400mm moveable unit +/- 60 arcsec FOV
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Board misalignmentBoard misalignment
Linear stages flexures: 15 m traslation, 15 arcsec tilt
Board translation
Board tilt
Spot displacements on Pyramid vertex: 0.1 mm, 0.05mas
Spot displacements onPyramid vertex: 0.4mas/deg,J band FWHM 30mas