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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