Natural Guide Stars (NGS) only for Adaptive Optics (AO) on ELT
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1 Natural Guide Stars (NGS) only for Adaptive Optics (AO) on ELT Ismaning - Feb 28th 2013 by R. Ragazzoni, C. Arcidiacono, M. Bergomi, M. Dima, J. Farinato, D. Magrin, L. Marafatto, V. Viotto
2 Why NGSs for AO on ELT...? Because are cheaper than LGSs Because lim mag of Pyramid WFS pushed the limits of AO... Because the patrol field of E-ELT is huge Because the rays from LGSs will arrive nevertheless from a similarly skewed angle Because NGSs are less invasive then LGS Because MCAO can be extended a little into Global MCAO and making this true...
3 Courtesy S. Esposito - Based upon real LBT data
4 Courtesy S. Esposito - Based upon real LBT data
5 Courtesy S. Esposito - Based upon real LBT data
6 Courtesy S. Esposito - Based upon real LBT data
7 Courtesy S. Esposito - Based upon real LBT data
8 Courtesy S. Esposito - Based upon real LBT data 40% =>16..17
9 INAF Astronomical Observatory of Padova Field of View comparison
10 INAF Astronomical Observatory of Padova Field of View comparison arcsec isoplanatic patch
11 INAF Astronomical Observatory of Padova Field of View comparison 2 arcmin MAD-like MCAO FoV
12 INAF Astronomical Observatory of Padova Field of View comparison 10 arcmin patrol FoV of E-ELT
13 SCAO: arcsec MAD-like MCAO 2' x wrt SCAO E-ELT patrol FoV 10' x 25 wrt MAD Field of View x wrt SCAO...and sky coverages goes linearly with for a fixed number of stars (1 for SCAO, 2+ for MCAO likes...) Still using 3..5 stars makes a gain of ~
14 SCAO: arcsec MAD-like MCAO 2' x wrt SCAO E-ELT patrol FoV 10' x 25 wrt MAD Field of View x wrt SCAO...and sky coverages goes linearly with for a fixed number of stars (1 for SCAO, 2+ for MCAO likes...) Still using 3..5 stars makes a gain of ~
15
16
17 1.57 arcmin 92 km 39 m
18 α
19 1.57 arcmin θ max 2α arcmin 92 km α 39 m
20 θ max (arcmin) α (arcmin) SCAO 4.21 From M. Le Louarn - ELT AO LGSs simulations
21 θ max (arcmin) α (arcmin) SCAO 4.21 From M. Le Louarn - ELT AO LGSs simulations
22 θ max (arcmin) α (arcmin) SCAO 4.21 From M. Le Louarn - ELT AO LGSs simulations
23 θ max (arcmin) α (arcmin) SCAO 4.21 From M. Le Louarn - ELT AO LGSs simulations
24 θ max (arcmin) α (arcmin) SCAO 4.21 From M. Le Louarn - ELT AO LGSs simulations
25
26
27
28 D tel = 8 m N. DMs = 2 N. actuators = 8 Field of View = 2 arcmin R Φ = 2D H F ϕ ( f ) df R MAD-8m = km 0 km
29 D tel = 40 m N. DMs = 2 N. actuators = 80 Field of View = 2 arcmin R Φ = 2D H F ϕ ( f ) df R MAD-40m = km 0 km
30 D tel = 40 m N. DMs = 3 N. actuators = 80 Field of View = 2 arcmin 13 km 8 km 0 km
31 D tel = 40 m N. DMs = 3 N. actuators = 80 Field of View = 2 arcmin N.VDMs = 0 13 km 8 km 0 km
32 INAF Astronomical Observatory of Padova
33 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin
34 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin 0 km
35 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin 8.6 km 0 km
36 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin 14.1 km 8.6 km 0 km
37 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin 14.1 km 8.6 km 7.4 km 0 km
38 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin 17.6 km 14.1 km 8.6 km 7.4 km 0 km
39 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin 17.6 km 14.1 km 11.5 km 8.6 km 7.4 km 0 km
40 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin 17.6 km 14.1 km 11.5 km 8.6 km 7.4 km 4.7 km 0 km
41 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin 17.6 km 14.1 km 11.5 km 8.6 km 7.4 km 4.7 km 2.8 km 0 km
42 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin 17.6 km 15.6 km 14.1 km 11.5 km 8.6 km 7.4 km 4.7 km 2.8 km 0 km
43 Ground VDM FoV = 5 arcmin VDMs FoV = 10 arcmin 17.6 km 15.6 km 14.1 km 11.5 km 9.9 km 8.6 km 7.4 km 4.7 km 2.8 km 0 km
44 The more the considered layers, the more precise the turbulence reconstruction The more the reconstructed layers, the more the noise from single measurments SNR N. Layers
45 Technology is at hands... Locally closed loop WFSs makes Pyramids working in (almost) closed loop These devices (we called Very Linear VL- WFSs) works around non zero Concpetually is exactly the same problem as MOAO NGSs are less invasive in the scientific focal plane Stars 10arcmin FoV Science focal plane
46
47
48 We are evaluating pro and cons of several different optical designs work in progress
49
50 MCAO on 2 arcmin at an 8m
51 MCAO on 10 arcmin at an 8m would not give advantages other then for GLAO...
52 MCAO on 10 arcmin (probably with 5+DMs) would works fine...
53 GMCAO on 10 arcmin compensating only the central 2 arcmin...!!!
54 Conclusions GMCAO can be used as back-up plan or......as performance mitigator (cyrrus, LGS failure...) and can coexists with LGSs. Performance assessment expected by AO4ELT3 in Florence late May
55 Conclusions GMCAO can be used as back-up plan or......as performance mitigator (cyrrus, LGS failure...) and can coexists with LGSs. Performance assessment expected by AO4ELT3 in Florence late May We have got a GMT model so...
56 Conclusions GMCAO can be used as back-up plan or......as performance mitigator (cyrrus, LGS failure...) and can coexists with LGSs. Performance assessment expected by AO4ELT3 in Florence late May We have got a GMT model so...
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