Transcript AOF The VLT Adaptive Optics Facility R. Arsenault, P.-Y. Madec, W. Hackenberg, J.

AOF
The VLT Adaptive Optics Facility
R. Arsenault, P.-Y. Madec, W. Hackenberg, J. Paufique, S.
Stroebele, J.-F. Pirard, E. Vernet, D. Bonaccini Calia, I. Guidolin,
M. Quattri, R. Guzman, B. Buzzoni, M. Comin, C. Dupuy, A.
Silber, J. Quentin, G. Igl, L. Taylor, J. Argomedo, P. Jolly, A.
Manescau, R. Stuik, M. Downing, J. Reyes, A. Jost, M.
Duchateau, N. Hubin, A. Glindemann, P. Amico, M. Lelouarn, J.
Kolb, S. Tordo, E. Fedrigo, R. Donaldson, C. Soenke, R.
Conzelmann, B. Delabre, M. Kiekebusch, J.-L. Lizon, P. La
Penna, L. Jochum
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AOF: why…what…
AOF
• To provide improved observing conditions for UT4
Instruments by delivering
– A better seeing in a Wide Field of View
– Diffraction limited images in one direction
• with as constraints
– Not to degrade the Instruments throughput/emissivity
– High sky coverage
• To turn-out UT4 in an Adaptive Telescope
– To replace M2 by a Deformable Secondary Mirror
– To provide a Multi-Laser Guide Star Facility
– To build two post-focal LGS/NGS WFS Modules
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HAWK-I and MUSE
AOF
the two (first) customers of AOF
• HAWK-I, a Wide FoV IR Imager (0.9 – 2.5 mm)
– 7.5 x 7.5 arcmin2 FoV – 0.1 arcsec pixel size
– Requirement towards AOF, in K bands
• Gain of ≈2 in EE in 0.1 arcsec (seeing reducer: x0.8)
• MUSE, a visible 3D Spectrograph (465-930 nm)
– WFM
• 1 x 1 arcmin2 FoV – 0.2 arcsec spaxel size
• Requirements towards AOF: gain of ≈2 in EE in 0.2 arcsec
– NFM
• 7.5 x 7.5 arcsec2 FoV – 0.025 arcsec spaxel size
• Requirements towards AOF: 5% to 10% Sr at 650 nm under 0.6
arcsec seeing
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AOF: how…
AOF
• MUSE NFM and WFM requirements
– Number of DSM actuators
– Number of WFS subapertures
– Control frequency
– LGS brightness (at Nasmyth)
– WFS camera RoN
> 1000 (1170 final)
> 33x33 (40x40 final)
≈ 1 kHz
5 106 photons/m2/s
< 1 e-/pixel/frame
• HAWK-I and MUSE WFM requirements
– Number of LGSs
4
• HAWK-I requirements
– LGS distance from opt. axis
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up to 6 arcmin
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AOF main subsystems
GRAAL
DSM
GALACSI
LGS Unit
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DSM/M2 Unit (MG/ADS/OAA)
AOF
• Same functions and interfaces as
the actual M2 Dornier
– Optical diameter
1120 mm
– Focus, centering, tilt/chop
– Hub interfaces
• 2 mm Zerodur thin shell, with
magnets glued on
• 1170 voice coil actuators
• DSM response time 0.7 ms
• Liquid cooled (1.5 kW)
• Delivery date
end 2011
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DSM development status
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4 Laser Guide Star Facility
AOF
• 4 identical LGS Unit, mounted on UT4 Center Piece
– One 40 cm diameter Launch Telescope (TNO)
– One Beam Control and Diagnostic System (ESO)
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Control of focusing altitude (70 to 200 km)
Control of LGS position (0 to 6 arcmin from optical axis)
LGS jitter stabilization mirror (controlled by AO modules)
Safety devices (shutters)
Diagnostic tools (power meter, WFS, alignment camera)
– One 20 W CW dual line laser (outsourced)
• 18 W in D2a and 2 W in D2b lines (back-pumping scheme)
• Compact, efficient, reliable and maintainable laser
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4LGSF: development status
AOF
FASORtronics Laser
TOPTICA Laser
Launch telescope (TNO)
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GRAAL: the HAWK-I AO Module AOF
• GLAO mode: seeing enhancer in 7.5 x 7.5 arcmin2 FoV
• 4 LGSs located almost 6 arcmin from the opt. axis
• No optics inserted in the HAWK-I scientific FoV
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GALACSI: the MUSE AO Module AOF
• WFM
• GLAO mode: seeing enhancer
in 1x1 arcmin2 FoV @ 750 nm
• 4 LGSs located ≈1 arcmin
from the optical axis
• NFM
• LTAO mode: 5% to 10% Sr in a
5arcsec diameter FoV @ 650
nm
• 4 LGSs located ≈10 arcsec
from the optical axis
• (Almost) no optics inserted
in the MUSE scientific FoV
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AOF: common critical components AOF
• SPARTA: real-time architecture for AO control
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Inputs: 4 x (240x240 pixels / 1240 subap.) Shack-Hartmann
Outputs: 1170 commands
Control frequency: 1 kHz – latency: 400 ms
WFS measurement algorithm: WCoG
Control algorithm: Matrix Vector Multiplication
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SPARTA: development status
AOF
VLT Gbit control LAN
Co-processing cluster
Instrument
WS
Dell
1950
Dell
1950
Dell
1950
Dell
1950
Dell
1950
Dell
2950
(storage)
Gbit LAN (VLT)
Gbit LAN (private)
serial FPDP
VXS serial lines
GB Ethernet Switch
Gigabit Ethernet Switch
VLT computer room
UT area
Gigabit Ethernet Switch
LGS 1
LGS 2
NGC
NGC
CSW1
LGS 3
LGS 4
RTC box
DSM
LCU
VPF1
VPF1
T2V6
T2V6
T2V6
T2V6
VPF1
NGC
NGC
switch
and
transc.
board
Wavefront
Wavefront
Processing
Processing
LGS
LGS
ReconReconstruction
Reconstruction
Reconstruction
struction
CODE
Control,
TTS WPU,
LGSF IF
GALACSI
only
TT (VIS)
NGC
IRLOS
GALACSI)
NGC
NGS
(GRAAL
MCM)
NGC
Jitter
Actuators
VXS backplane
RTC box
CODE
(in 4LGSF)
SPARTA RTC
FS
Actuators
4LGSF
Co-processing cluster
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AOF: common critical components AOF
• SPARTA: real-time architecture for AO control
–
–
–
–
–
Inputs: 4 x (240x240 pixels / 1240 subap.) Shack-Hartmann
Outputs: 1170 commands
Control frequency: 1 kHz – latency: 400 ms
WFS measurement algorithm: WCoG
Control algorithm: Matrix Vector Multiplication
• WFS camera
– 240x240 pixels – 1000 frames/s
– High QE: > 80% @ 589 nm
– RoN: < 1e-/pixel/frame
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WFS Cameras: development status AOF
E2V CCD 220
WFS camera head: first ESO prototype
Ocam – test camera
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AOF: common critical components AOF
• SPARTA: real-time architecture for AO control
–
–
–
–
–
Inputs: 4 x (240x240 pixels / 1240 subap.) Shack-Hartmann
Outputs: 1170 commands
Control frequency: 1 kHz – latency: 400 ms
WFS measurement algorithm: WCoG
Control algorithm: Matrix Vector Multiplication
• WFS camera
– 240x240 pixels – 1000 frames/s
– High QE: > 80% @ 589 nm
– RoN: < 1e-/pixel/frame
• ASSIST: the AOF test and calibration tool
– Optical calibration of the DSM
– Full system test of the AOF
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ASSIST: the AOF test bench
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AOF
2.5 arcmin unvignetted fov
Diffraction limited on-axis and stringent pupil imaging quality
Simulation of NGSs and LGSs (including elongation)
3 phase screens at different altitudes
Simulation of VLT Nasmyth focus (f/15 – pupil at -16 m from focus)
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ASSIST: development status
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AOF on-sky: when…
AOF
• Critical path: DSM and laser delivery
– DSM
– Laser
end 2011
last one beginning 2013
• Tests of DSM, GRAAL and GALACSI in Garching
– One year needed
end 2012
• Installation of AOF at Paranal
– Beginning 2013 (synchronized with laser delivery)
• AOF first light
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