a first-light ao system for lbt agw unit : a conceptual design
DESCRIPTION
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 PresentationTRANSCRIPT
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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
Pupil displacements onWFS CCD0.5 m/20 deg (24 m/pixel)
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Pyramid Optical set-up IPyramid Optical set-up I
Optical set-up
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The The PPyramidyramid Operating Principle Operating Principle
Pupil plane
x
y1 2
4 3
DETECTOR
Glass Pyramid
Telescopepupil
Pupil re-imager
Image plane PSF
pixels used for slope computationat the correspondin pupil subarea
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A Moveable WFS for A Moveable WFS for the AGW Unit IIthe AGW Unit II
HO beam TT beam
Field Viewerbeam
CCD 39/60
Field viewer
PI
Stra
p un
it
Incoming f15 beamfrom LBT focal plane
Telecentric lens
ADC opticsFilter wheel
Piezo steering mirror
pyramids
• Board dimension 400x320 mm including detectors• 100x100x100 CCD head• 80x100x100 STRAP unit
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Another view........Another view........
Folding mirrors
Filter wheels
CCD39
Fieldviewer
Strapunit
PI
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NGS HNGS High igh OOrderrder Channel (EEV39)Channel (EEV39)
Pupils on CCD 60 (128x128)Camera doublet f = 67 mmFocal plane to pupil plane distance 135mmPupil diameter: 1440 m (60 pixels)
NOT TO SCALE
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NGS HNGS HOO PSF: Board On-AxisIPSF: Board On-AxisI
board on axis, Strehl ratio at the focal plane (f/45) vs. FOV
ZENIT angle (°)
-1 -0.5 0 0.5 1
0 0.962 0.966 0.967 0.966 0.962
35 0.919 0.927 0.934 0.938 0.941
69 0.913 0.923 0.934 0.945 0.953
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NGS HNGS HOO PSF: Board Off-AxisPSF: Board Off-Axis
Board 1 arcmin off axis, Strehl ratio at the focal plane (f/45) Vs. FOV
ZENIT angle (°)
-1 -0.5 0 0.5 1
0 0.798 0.799 0.796 0.791 0.787
35 0.706 0.709 0.711 0.712 0.711
69 0.725 0.742 0.756 0.768 0.778
LBT only (f15)
LBT + board (f45)
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The NGS HO Pyramid design IThe NGS HO Pyramid design I
•Vertex 30°, SK10•Vertex 28.2°, SSK2•FOV +/- 1 arcsec•Energy loss on edges < 10 %•Chromatism 0.9-3 m at 0-69 deg wl range (0.6 – 1.0 m)
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NGS TipNGS Tip--TTiltilt ChannelChannel
NOT TO SCALE
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NGS TipNGS Tip--TTiltilt beam beam II II
Strap Unit
2.55mm
123
m
2 arcsec / 3.6 mm
• APD sensitive area 200 m• APD separation adjustable• around 2.8 mm• Pyramid angle 30 deg (SSK2)• Chromatism about 30 m
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NGS Field Viewer beamNGS Field Viewer beam
CCD65 camera
• 3L CCD 65• Sensible area 11.5x8.6 mm• FOV 6.4x4.8 arcsec• Pixel size 20x30 m• R band not well sampled
NOT TO SCALE
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LGS High Order ChannelLGS High Order Channel
Telecentric lensfor NGS board
Sodium beacon
NOT TO SCALE
764 m, (32 pixel)
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LGS High Order ChannelLGS High Order Channel
764
m
1800
m
LBT NGS focal plane
LBT LGS Focal plane
• Single pyramid (Silica) • Pyramid angle 7 deg• No edge problems
58mm15.9mm 12.8mm
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NGS HO Channel throughputNGS HO Channel throughput
ADC C04-64BAM23
6.4 mm6.4 mm
0.9931
0.993
Triplet FK51KZFSN5F2
1.71 mm1.71 mm1.71 mm
0.99830.99890.9989
0.996
Beam splitter
BK7 0.7 mm 1 1
Telecentric lens
F_Silica 5 mm 1 1
Doublet camera
C04-64BAM23
2.85 mm3.2 mm
0.9951
0.995
Pyramid SK10SSK2
5.84 mm5.55 mm
0.99750.9985
0.996
Total transmission 0.98
Coating (812 nm Balzer Supertriolin 0.7%)
ADC 4 surfaces glass-air
0.038 0.962
Triplet 2 surfaces glass-air
0.014 0.986
Beam splitter
2 surfaces glass-air
0.05 0.95
Telecentric lens
2 surfaces glass-air
0.014 0.986
Doublet camera
2 surfaces glass-air
0.014 0.986
Pyramid 2 surfaces glass-air
0.014 0.986
Balzer Silflex-VIS
Mirror1 0.98
Mirror2 0.98
Total NGS HO transmission 0.846
Internal Glass Trasmission
Air/Glass trasmission
Pyramid Edge losses 10 %Pyramid Edge losses 10 %TOTAL TRASMISSION 0.83 * 0.9 = 75 %TOTAL TRASMISSION 0.83 * 0.9 = 75 %
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WFSs on-board Opto-mechanicsWFSs on-board Opto-mechanics
HO CCD
FW CCD
STRAP
PIFolding mirrors
Filter wheels
FW1• tilt: +/- 9’ => +/- 2mm PSF disp.• hole: focus disp. 1mm• hole: beam traslation (20deg) => 1mm pupil disp. (1/8 relative disp.)• PI mirror, as FW1
HO FM • tilt: +/- 1deg => +/- 1 mm PSF disp.• tilt: 1’ => pupil disp. of 8.7 m
TT FM • tilt: +/- 1deg => < 2 mm PSF disp.• tilt: 1’ => pupil disp. of 7 m• hole: beam traslation, (20deg) => 1mm• pupil disp. (1/8 relative disp.)
FW2 • hole: beam translation (10deg) => 0.5mm pupil disp. (1/20 relative disp.)
FW1FW2
HOTT
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Board positioning for guide star acquisitionBoard positioning for guide star acquisition
Board focusing Ref. Sourceacquisition
Sodium laser channelAnd WFS
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LBT AO System: RT operation & HWLBT AO System: RT operation & HW
CCD96 PIO
STRAP UNIT
APDs' TIP-TILTSENSOR
RS 232
M2 crates
Slopecomputer
Hig
h sp
eed
fiber
link
Controller
CCD39/50/60
64x64x16bit 1ms1Kframe/s(65Mbit/s)
16op/sensing subap.32x32 subaperture50 s comp. timeDSP op. rate 320 Mflops/s
32x32x2x32bit27 s trasm. time 2.4 Gbit/s fiber link
Reconstruction:(32x32x2)x672x2op:27 s WF rec. 107 Gflop/s (336DSP)
TCS
Diag. comp
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First light and MMT testFirst light and MMT test
LBT 1st light MMT test HWCCD controller and SLC intf.
65 Mb/s 16 Mb/s Four 16bit parallel port
SLC 32 Mflops/s 8 Mflops/s300 Mflops/sper BCCU
SLC intf. To LBT672 65 Mb/s 11 Mb/s 2.4Gb/s
WFC 5 Gflops/s230 Mflops/s2.0 ms int.
300 Mflops/s x 336 DSP, 107Gflops/s
LBT 1st light:32x32 sub. (16bit/pixel) 1Kframe/s (CCD60)32x32x2 slopes (32bit/slope)2048x672 REC MATRIX
MMT test:16x16 sub. (16bit/pixel)500frames/s (CCD39) 16x16x2 slopes (32bit/slope)512x336 REC MATRIX
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LBT AO System: test facility I LBT AO System: test facility I
15m
Optical bench bolted to the tube
LBT672
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LBT AO System: test facility IILBT AO System: test facility II
M2
Test Interferometer focus
F1Reflecting optics
Test beam
Test interferometer
“Instrument” 15o tilted entrance window
WFS unit
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LBT AO System: scheduleLBT AO System: schedule
J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J2001 2002 2003 2004
Adaptive Secondary act design
Inst
alla
tion
LBT672
Shi
ppin
g
Adaptive Secondary
Wavefront sensor
System Software
CCD60
Test tower
act designprocurement P36' test
Inst
alla
tionClosed loop
P45+WFS+RTR
LBT672inst&test
inst.
P45 testDesign phase
OptoMecc Procur.assemb.and test
MMTtestTower
CL WFS+LBT672
Shi
ppin
g
Debugging
FASTI controller design and test LLLCCD Final controller test BI L3CCD
RT softwareDiagnostic Design phase 1 Design phase 2
Coding phase 2Coding phase 1
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First Light AOFirst Light AOPreliminary cost estimatePreliminary cost estimate
AO WFS•Design•Prototyping•Lab Test•P45 Test•MMT Test?•Full Sys test•Installation
LBT 672•Test Tower•P36’ test•P45 test•LBT 672 constr.•LBT 672 test•Full Sys test•Installation
First Light AO requires work on various sub programs:
LLLCCD•Det. Proc.•“Fasti” test•LLL ControllerPrototype•LLL Controller
AO Software•Basic loop SW•Housekeeping•Diagnostics•Self-optimization•User interface•TCS interface•Installation
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AO System ManpowerAO System Manpower
PersonnelName univ. deg PHD Project role % of time period total % of time period total
months months months monthsWFS,Full System Test, tel. IntegSimone Esposito Phys Y Project head, System 70 26 18,2 30 12 3,6Piero Ranfagni* Nat. Sciences Program management10 26 2,6 10 12 1,2Andrea Tozzi Phys Optical Design, Optical testing50 26 13 30 12 3,6Debora Ferruzzi Phys Optical Design 70 4 2,8 20 12 2,4Matteo Accardo Opto-mechanics 40 10 4 20 12 2,4Marcel Carbillet Phys Y AO algorithms and Simulations40 20 8 0 12 0
48,6 13,2SoftWare,Full Sys. Test, tel. Integ.Luca Fini El-nics Eng. Head of SW development70 25 17,5 0 0Gavryusev Vladimir Phys y SW 50 25 12,5 0 0Alfio Puglisi SW 50 25 12,5 0 0Piero Ranfagni ** Nat. Sciences SW 30 25 7,5 0 0
50 0Full Sys. Test, tel. IntegArmando Riccardi Phys Head of AS development60 6 3,6 40 6 2,4Simone Busoni Phys y sys. test 40 6 2,4 30 6 1,8Paolo Stefanini Mechanics, thermal contr.20 4 0,8 0 4 0Valdemaro Biliotti* Electronics 20 4 0,8 0 4 0
7,6 4,2
Unit 1 106,2 Man-monthUnit 2 17,4
WFS1 WFS2Type and Role
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L3 CCD ManpowerL3 CCD Manpower
Arcetri/Bologna Staff involved in LLLCCD controller (Contr.) development and system test (ST)
Name Project role % of time 1/1/02-31/3/03
Carlo Baffa Head of Controller develop. 50 7,5Valemaro Biliotti** Controller electr. Low level SW 60 9Elisabetta Giani SW 30 4,5Alessio Checcucci Electronics, testing 10 1,5Mauro Sozzi Electronics, develp. Assembly 30 4,5
0Italo Foppiani Head of Detector lab 80 12Giovanni Bregoli SW 50 7,5Giuseppe Cosentino Electronics 50 7,5
54 months
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WFS HardwareWFS Hardware cost: first unit cost: first unit
N/unit noteCCD39 (or LLLCCD60)+ Controller 1 30 okLLLCCD60 + controllerSTRAP unit + controller 1 40 okPI modulator+ controller 1 10 okOptical viewer +controller 1Pyramids (HO +TT) 2 5 okoptics 5 ?board mechanics (design +construct) 20 ?Lab motion controllersGlobal motion XYZ stages 3 15 okSlope computer and communications 1 15 ?Subtotal 125Italian VAT? (20%) 25 !!!!!Total HW cost (with VAT) 150
k$
Hardware (one unit)Cost to LBT
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Cost SummaryCost Summary
Wavefront Sensor + SW• First Unit 362 k$• Second unit 185 k$Total WFS 547 k$
Adaptive secondary 136 K$
Not charged to LBTC:
LLLCCD DEV 270k$Test Tower 185k$Total 455k$
683 k$ LBTC cost
455 k$ Arcetri/Bolognacost
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Work in progress……Work in progress……
Optical design optimization & tolerances
echanical tolerances
System performance simulations
other................
Rerotator, optical vs. software