OWL TECHNOLOGIES Copenhagen, November 2004. IAU Symposium 225 - Lausanne, July 2004 - - Slide 2...
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Transcript of OWL TECHNOLOGIES Copenhagen, November 2004. IAU Symposium 225 - Lausanne, July 2004 - - Slide 2...
OWL TECHNOLOGIES
Copenhagen, November 2004Copenhagen, November 2004
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Design overview
Optics 6-mirror, f/7.5,
~6,900 m² collecting area,
near-circular outer rim
M1 Spherical dia. 100m, f/1.2 3048 segments
M2 Flat, dia. 25.6 m 216 segments
Corrector 4 elements, dia. 8, 8, 3.5, 2m
FOV 6 focal stations (rotation of M6) 10 arc min. seeing-limited; > 2 arc min.diffraction-limited (vis.)
Stability Very low sensitivity to external disturbances (gravity, thermal, wind)
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Optical design
Adaptive, conjugated to pupil;First generation
Adaptive, conjugated to pupil;First generation
Adaptive, conjugated to 8km;Second generation
Adaptive, conjugated to 8km;Second generation
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Why a spherical primary / flat secondary ?
Larger corrected field of view than equivalent Ritchey-Chretien
Low sensitivity to M2 decenters
Corrector excellent baffling options
Secondary mirror an issue with aspherical primary Small M2 (< 3-m) very high sensitivity to disturbances Large M2 (> 3-m)
severe fabrication issue if convex added tube length if concave (Gregorian)
All wavefront control functions with 6 surfaces
Multi-conjugate AO (2 mirrors 2- and 4-m, conjugated to 0, 8 km) Moderately large FOV (0.5 – 2 arc min) an essential mode Needs re-imaging; OWL provides dual conjugate with 6 surfaces only !
Maintainability: 3,000 segments, all identical & interchangeable.
System Performance Risk & cost
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Why a spherical primary / flat secondary ?
Use of planetary polishers or large stiff figuring tools Lower segment edge misfigure Stable reference, repeatability of radius of curvature
No warping harness Structured blanks possible (SiC a serious option) Less stringent requirements on blanks internal stresses
Segment size up to ~2.3-m possible Limited by cost-effective transport in standard container No aspherization weak size-dependence
Performance losses Lower throughput than a Ritchey-Chretien (option: enhanced coatings ?) Higher emissivity (option: single surface corrector for very small field of view ?)
System Performance Risk & cost
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Why a spherical primary / flat secondary ?
Spherical polishing Simple and predictable
processes, stable and predictable yield
Stable reference (rigid tools) Fast process, high efficiency;
OWL polishing tool area = 36 largest GTC tool area !
Simple test set-upUnique matrix no segments matching risk
TBC: No edge cutting, polished hexagonal
System Performance Risk & cost
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Segment assemblySegment unit
Segmentassembly
Segment
Interface pads
Axial interface pads
Lateral interface pads
Reference targets
Segment activesupport system
Slave actuator forlateral support
Position actuators
Support structure
Metrology
Position sensors
Spacers
LCU Optical surface
Segment blank
Whiffle-tree
Total quantity: 3048 + 216 + TBD spares
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Actuators - Outline of specifications
Load cases (nominal, tension and compression) Glass segments: 0 to 170 kg / actuator Lightweight SiC segments: 0 to 40 kg / actuator
Accuracy 2 stages Position Actuator Concept Coarse stage ± 0.05 mm. Fine stage ± 5 nm - Goal ± 2 nm Extractor ± 1 mm
Stroke Coarse stage 20 mm Fine Stage 0.5 mm - Goal 1mm Extractor 150 mm TBC
Closed Loop Bandwidth Fine stage 5Hz - Goal 10 Hz. Coarse stage 0.1 Hz.
Max. cost (unit cost for a production of 10,000 units) Glass segments: < € 3,500.- Goal < € 2,500.- SiC segments < € 2,500,- Goal < € 2,000.-
Load cases (nominal, tension and compression) Glass segments: 0 to 170 kg / actuator Lightweight SiC segments: 0 to 40 kg / actuator
Accuracy 2 stages Position Actuator Concept Coarse stage ± 0.05 mm. Fine stage ± 5 nm - Goal ± 2 nm Extractor ± 1 mm
Stroke Coarse stage 20 mm Fine Stage 0.5 mm - Goal 1mm Extractor 150 mm TBC
Closed Loop Bandwidth Fine stage 5Hz - Goal 10 Hz. Coarse stage 0.1 Hz.
Max. cost (unit cost for a production of 10,000 units) Glass segments: < € 3,500.- Goal < € 2,500.- SiC segments < € 2,500,- Goal < € 2,000.-
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Position sensors
Capacitive, inductive or opticalMounted at segments edgesMeasurement range 0.5 mm (TBC)Differential accuracy over full range 5 nm Goal 2 nmMaximum measurement frequency 20 Hz Goal 50 HzRe-calibration frequency once per weekMaximum heat dissipassion TBD (minimize)Maximum unit cost (20,000 units) € 1,250.- Goal € 750.-
Capacitive, inductive or opticalMounted at segments edgesMeasurement range 0.5 mm (TBC)Differential accuracy over full range 5 nm Goal 2 nmMaximum measurement frequency 20 Hz Goal 50 HzRe-calibration frequency once per weekMaximum heat dissipassion TBD (minimize)Maximum unit cost (20,000 units) € 1,250.- Goal € 750.-
Variable 2 to 14 mm
70 to 90 mm, depending on segment size
Cross-section through glass / glass-ceramic segments
Variable 2 to 14 mm
Min. 70 mm
Cross-section through SiC segments
Max 10 mm Max. 10 mm
Max. 10 mm
M1 Covers
M2 Handling tool
Sliding enclosure
Maintenance facility
Azimuth tracks
Altitude bearing
Azimuth structure & bogies
Altitude tracks
Altitude cradles& bogies
Structure ribs (6-fold symmetry)
Corrector & instrumentation
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All dimensions as multiple of segment size
Standardization Ease of integration Ease of maintenance Optimal loads transfers
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Optomechanics
Fractal design - Low-cost,
lightweight steel structure
14,800 tons moving mass (60 times “lighter” than VLT)Mass reduced to ~8,500 tons with SiCAmple safety margins (stresses, buckling)
2.6 Hz locked rotor eigenfrequency Low thermal inertia
(developed surface, natural internal air circulation inside structural elements)
Differential M1-M2 decenters under gravity
Piston 3.4 mmLateral 17.6 mmTilt 3.4 arc secs
Moving mass (t)Moving mass (t)
Eigenfrequency (Hz)Eigenfrequency (Hz)
(rigid body motion)
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Reducing sensitivity by design
• Innocuous lateral M1-M2 decenters• Parallelogram-shaped
structural modules favour lateral over angular decenters
• Lose centring tolerances • Corrector favourably
located (stiffness)• Ample design
space
2030
5
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Instrument racks
6 focal stations; switch by rotating M6 about telescope axis.Max. instrument mass 15 tons each.Local insulation & air conditioningIssue: needs rigid connection with corrector (TBC).
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Controlled optical system
Kinematics pointing, compensation for sky rotationMetrology: encoders, on-sky guide probe
Pre-setting bring optical system into linear regimeMetrology: internal, tolerances ~ 1-2 mm, ~5 arc secsCorrection: re-position Corrector, M3 / M4 / M5
Phasing keep M1 and M2 phased within tolerancesMetrology: Edge sensors, Phasing WFSCorrection: Segments actuators
Field Stabilization cancel “fast” image motionMetrology: Guide probe Correction: M6 tip-tilt (flat, exit pupil, 2.35-m)
Active optics finish off alignment / collimation relax tolerances, control performance & prescription
Metrology: Wavefront sensor(s)Correction: Rotation & piston M5; M3 & M4 active deformations
Adaptive optics atmospheric turbulence, residualsMetrology: Wavefront sensor(s)Correction: M5, M6, …
Kinematics pointing, compensation for sky rotationMetrology: encoders, on-sky guide probe
Pre-setting bring optical system into linear regimeMetrology: internal, tolerances ~ 1-2 mm, ~5 arc secsCorrection: re-position Corrector, M3 / M4 / M5
Phasing keep M1 and M2 phased within tolerancesMetrology: Edge sensors, Phasing WFSCorrection: Segments actuators
Field Stabilization cancel “fast” image motionMetrology: Guide probe Correction: M6 tip-tilt (flat, exit pupil, 2.35-m)
Active optics finish off alignment / collimation relax tolerances, control performance & prescription
Metrology: Wavefront sensor(s)Correction: Rotation & piston M5; M3 & M4 active deformations
Adaptive optics atmospheric turbulence, residualsMetrology: Wavefront sensor(s)Correction: M5, M6, …
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Controlled opto-mechanical system I – Pre-setting
Corrector re-centering + 2 (TBC) surfaces within the corrector
Internal metrology (e.g. fiber extensometer)Typical accuracy:10 ppm goal 1 ppm
Bandwidth << 1 Hz
High operational reliability
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Controlled opto-mechanical system II – Kinematics
Friction drivesAzimuth: 246 unitsElevation: 154 unitsBandwidth ~0.5 Hz
Fast steering mirrorM6, dia. 2.35m
Guide probes attechnical focusaccessible FOV 10’
Guide probes attechnical focusaccessible FOV 10’
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M6 adaptive & tip-tilt unit
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Controlled opto-mechanical system III – Active optics
Dual conjugate active opticsDeformable M3 & M4VLT-type mirrors
Refocus & fine centering
Refocus & fine centering
5 Wavefront Sensorsat each technical focus (FOV 10’)+ feedback AO
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Controlled opto-mechanical system IV – Phasing
Telescope focus
Pinhole
Interferogram
Interferogram
Reference channel
Beamsplitter
Beamsplitter
Mach-Zehnder phasing sensor
On-sky calibration off-axis
Two segmented mirrors Bandwidth ~5 Hz TBCEdge sensors (capacitive,Inductive or optical)
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Mach-Zehnder calibration sensor
Interferogram(ideal conditions)
Complex geometry, But fully predictable
Localized signal
2k x 2k camera sufficientfor adequate sampling
Interferogram(ideal conditions)
Complex geometry, But fully predictable
Localized signal
2k x 2k camera sufficientfor adequate sampling
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Piston, Tip, and Tilt: Examples
Piston onlyPiston onlyX – tilts same signsX – tilts same signs
Y – tilts opposite signsY – tilts opposite signs
X – tilts opposite signs
X – tilts opposite signs
Ph
ase
Ph
ase
Sig
na
lS
ign
al
Fe
atu
res
Fe
atu
res
Antisymmetryaxis Y Antisymmetryaxis Y
Antisymmetryaxis YAntisymmetryaxis Y
Antisymmetryaxis X Antisymmetryaxis X
Symmetryaxis YSymmetryaxis Y
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Atmosheric Wavefront
AO Simulations on OWL.
Illumination on the pyramid WFS
125 sub-apertures across pupil, 11198 actuators on M6Bright NGS on-axis, 1 kHz frame-rate, ~1 sec of real-life PSF
4 ms coherence time, 0.5’’ seeing (at 0.5 m)OWL pupil + cophasing M1 & M2: 35 nm WFE RMS each
K band, Strehl ~70%
MCAO simulation
2 arc minutes field, =2.5 m2 adaptive mirrors, 8000 actuators each
3 guide stars
Sqrt stretch
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Adaptive mirrors
LBT – 911 mm diameter, 672 actuators
MMT – 642 mm diameter, 336 actuators
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Adaptive mirrors (MMT336) aspherical shell
Magnets
642mm dia.2mm thick
(12mm diam.)
Capacitive sensors (ref.plate)
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Extreme AO
High performance adaptive optics at visible wavelength
Need for 105-106 actuators MOEMs
Time scale : beyond 2015
Some effort going on but need to ramp up
Positive factor: limited stroke necessary, large deformable mirrors act as first stage
Technology review, design, production & testing of demonstrators foreseen in OWL Phase B
High performance adaptive optics at visible wavelength
Need for 105-106 actuators MOEMs
Time scale : beyond 2015
Some effort going on but need to ramp up
Positive factor: limited stroke necessary, large deformable mirrors act as first stage
Technology review, design, production & testing of demonstrators foreseen in OWL Phase B
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Adaptive Optics
Today 2008 2015 2019
IR Deformable Mirrors LBT (JWST) Prototype OWL 1st Gen. 2nd Gen.
Diameter 1-m (2-m) 0.3-m 2-m 3.2-m
Actuator spacing 30 mm 15 mm 15-25 mm 20-25 mm
XAO corrector Moems/Pzt
Detector 256x256 ? 512x512 1kx1k
AO real time control Almost OK
Reference stars NGS (LGS) NGS NGS / LGS
High sky coverage in the near-IR (better filling of metapupil) LGS needed ~2018; lower number of LGS, Cone effect requires novel approaches e.g. PIGS (Ragazzoni et al)
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(Pupil shape outdated)
Telescope performance (wind)
Tracking : low concern M2 flat ! Design insensitive to
M2 lateral decenters Structural design privileges
M2 lateral decenter over M2 tilt Corrector at very stiff location
DYNAMIC ANALYSISWorst caseS combined (orientation), 10 m/s, conservative drag coefficients
Maximum mean displacements out of worst load cases
WindMODELLING & TESTING
Limited confidence in CFD (Results suspiciously good !)
Wind measurements at Jodrell Bank (2004)
Wind tunnel testing (2004)
Analysis & modelling
MODELLING & TESTING
Limited confidence in CFD (Results suspiciously good !)
Wind measurements at Jodrell Bank (2004)
Wind tunnel testing (2004)
Analysis & modelling
Courtesy PSP
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Wind (pressure distributions)
ACCELERATED - ACTUAL ELAPSED TIME 150 SECONDS
M1 Corrector M2
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Variable wind screen embedded in theazimuth structure (notional design);
M2 wind screen not shown
Wind – design options
1. Higher local stiffness (substructure supporting segments) increases resistance to high spatial frequencies
2. Use of SiC segments higher M1 & M2 bandwidth
3. Embedded variable wind screens (up to z~30o)
4. Increase M4 (active mirror) bandwidth ~2-5 Hz(VLT M1 support dimensioned for 1 Hz)
5. Increase range of M6 adaptive correction
6. Operational constraints
7. Site selection
… required for AO anyway… required for AO anyway
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Cost estimate (capital investment, 2002 M€)
Diffraction-limited instrumentation (acceptable étendue !)Assumes “friendly site” Average seismicity (0.2g) Moderate altitude Average wind speed Moderate investment in infrastructures
SUMMARY MEuros
OPTICS 406
Primary & secondary mirror units 355.2
M3 unit 14.4
M4 unit 21.4
M5 temporary unit 5.3M6 temporary unit 10.1
ADAPTIVE OPTICS 110
M5/M6 design & prototypes 10
M6 AO unit 25
M5 AO unit 35XAO units 20LGS 20
MECHANICS 185
Azimuth 53.8
Elevation 34.9
Cable wraps 5.0
Azimuth bogies (incl. motors) 14.7Altitude Bogies & bearings 5.7Mirror shields 15.0Adapters 6.0Erection 50.0
CONTROL SYSTEMS (*) 17Telescope Control System 5.0M1 Control System 8.0M2 Control System 2.0Active optics Control System 2.0
CIVIL WORKS 170
Enclosure 40.4
Technical facilities 35.0
Site infrastructure 25.0
Concrete 70.0
INSTRUMENTATION 50
INSTRUMENTATION 50
Total without contingency 939 938.9
(*) High level cs only; local cs included in subsystems
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Cost estimates (industrial studies)
SiC A + Overcoating1
SiC B + Overcoating2
SiC B + Overcoating3
Glass-ceramics C Glass-ceramics D
Substrate & polishable overcoating
To
tal c
ost
Polishing
Overcoating
Blanks
2002 ESO ESTIMATE
Primary & secondary mirror segments; 1.8-m; polished, prices ex works.
Blanks: SiC (2 suppliers A and B) with overocatings (3 suppliers 1, 2, 3)
Glass-Ceramics (2 suppliers C and D)
Polishing: 2 suppliers, only one shown (both agree within 10%)
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Optimized geometry (interface optics-mechanics)All parts fitting in 40-ft containers1.6-m all-identical segments (~3000 units),single optical reference for polishing12.8-m standard structural modules (integer multiple of segment size)Friction drive (bogies), hydraulic connection
Optimized geometry (interface optics-mechanics)All parts fitting in 40-ft containers1.6-m all-identical segments (~3000 units),single optical reference for polishing12.8-m standard structural modules (integer multiple of segment size)Friction drive (bogies), hydraulic connection
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Cost vs quantity
Industrial data Applies to conceptually simple items (e.g. segments, structural nodes)
0.00
0.20
0.40
0.60
0.80
1.00
1 10 100 1000 10000
Number of units
CO
ST
FA
CT
OR
VLT M1 polishing (4 units)
OWL segments(industrial studies)
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Polishing: factory implementation
Size (area) comparable to VLT 8-m production facility
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ECMBOOSTEC
Meanwhile …
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• Phase C/D approval 2010Phase C/D approval 2010• 8-m mirrors need 6 years8-m mirrors need 6 years First light early 2016First light early 2016 Start of science 2017, 60mStart of science 2017, 60m
BUT: BUT: long lead items highly standardizedlong lead items highly standardized multiple supply lines possiblemultiple supply lines possible faster integration possiblefaster integration possible
ALTERNATIVE ALLOWING FIRST LIGHT IN 2014 (TBC) IS ALTERNATIVE ALLOWING FIRST LIGHT IN 2014 (TBC) IS UNDER EVALUATIONUNDER EVALUATION
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Timeframe
2000
2005
2010
2015
2020
Phase A review
Phase A
APE on sky
ELT Design Study
Phase B
Site selection
Phase C/D
Groundbreaking
First light (50-m)
Start of science (60-m)
Completion
Driven by funding, not by technology
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Planned studies 2005 - OWL phase A
Conceptual design of M6 adaptive subunit
Storage and postprocessing of the Jodrell Bank data
Feasibility study for wind tunnel measurements
Wind tunnel measurements (Jodrell Bank model)
Feasibility study for CFD simulations
CFD simulations
Dynamic Analysis of M1 / Corrector M3-M6 Control
OWL Instruments Conceptual Design Studies
Vibration dampers (local modes)
Optimization runs of the mechanical structure
I/F with concrete
Feasibility study M4 figuring / CGH Conceptual Design
Conceptual design of M6 adaptive subunit
Storage and postprocessing of the Jodrell Bank data
Feasibility study for wind tunnel measurements
Wind tunnel measurements (Jodrell Bank model)
Feasibility study for CFD simulations
CFD simulations
Dynamic Analysis of M1 / Corrector M3-M6 Control
OWL Instruments Conceptual Design Studies
Vibration dampers (local modes)
Optimization runs of the mechanical structure
I/F with concrete
Feasibility study M4 figuring / CGH Conceptual Design
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ELT Design Study
The R&D part of a phase B
Objectives
Technology development towards a European ELT Preparatory work for observatory design Top level requirements Academic & industrial synergy
Design-independent
Proposal to EC within FP6 - Approved
39 partners, 47 WPs / Tasks 42 M€ total, 22 M€ requested Timescale 2005-2008
The R&D part of a phase B
Objectives
Technology development towards a European ELT Preparatory work for observatory design Top level requirements Academic & industrial synergy
Design-independent
Proposal to EC within FP6 - Approved
39 partners, 47 WPs / Tasks 42 M€ total, 22 M€ requested Timescale 2005-2008
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ELT Design Study ProposalELT Design Study Proposal
The R&D part of a phase BThe R&D part of a phase B
ObjectivesObjectives
– Technology development towards a European ELTTechnology development towards a European ELT– Preparatory work for observatory designPreparatory work for observatory design– Top level requirementsTop level requirements– Academic & industrial synergy Academic & industrial synergy
Design-independentDesign-independent
Proposal to EC within FP6 - ApprovedProposal to EC within FP6 - Approved
– 39 partners, 47 WPs / Tasks39 partners, 47 WPs / Tasks– 42 M42 M€ total, 22 M€ requested – 8 M€ granted€ total, 22 M€ requested – 8 M€ granted– Timescale 2005-2008 Timescale 2005-2008
ESO as coordinatorESO as coordinator
Contract currently under negotiation with ECContract currently under negotiation with EC
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Matrix structureMatrix structure
Participants (39)Participants (39)
WP/Task (47) WP/Task (47) AA BB CC ...... ZZ
11
22
33
44
55
……
4646
4747
Participants (39)Participants (39)
WP/Task (47) WP/Task (47) AA BB CC ...... ZZ
11
22
33
44
55
……
4646
4747
WP budget
Part.budget
Part.budget
Part.budget
WP budget
WP budget
Budget prep. tool
WP consol. tool
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Project OrganizationProject Organization
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Shares, in % of total Shares, in % of total estimated budgetestimated budget
Australia3.8%
France16.4%
Germany2.2%
International38.0%
Ireland0.5%
Israel0.2%
Italy10.4%
NL1.3%
Spain10.6%
Sweden4.8%
UK5.9%
CH1.4%
Belgium4.5%
Institute / university
40%
Industry22%
International organization
38%
ESO
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Engineering WP - overviewEngineering WP - overviewNoNo TitleTitle TopicsTopics Breadboard / prototypesBreadboard / prototypes
0100001000 Project ManagementProject Management [includes overall system / project engineering][includes overall system / project engineering]
0400004000 Wavefront ControlWavefront Control Phasing, actuators, metrology, Phasing, actuators, metrology, APE, WEB (wind)APE, WEB (wind)PSF properties, high contrastPSF properties, high contrastimaging, error budgetingimaging, error budgeting
0500005000 Optical fabricationOptical fabrication SiC, opt. finishing, Al mirrors, coatings SiC, opt. finishing, Al mirrors, coatings 8 x 1-m SiC segments8 x 1-m SiC segments
0600006000 MechanicsMechanics Composite materials, MagLev,Composite materials, MagLev, Friction Drive breadboardFriction Drive breadboardFriction drivesFriction drives
0700007000 ControlControl Support to other WPs (APE, WEB)Support to other WPs (APE, WEB)
0800008000 Enclosure & infrastr. Enclosure & infrastr. Enclosure concepts, renewable Enclosure concepts, renewable energies, infrastructures, wind tunnelenergies, infrastructures, wind tunnel
0900009000 Adaptive OpticsAdaptive Optics WFE on 100-m scale, AO units WFE on 100-m scale, AO units DM prototypesDM prototypesdesigns, large DMs, novel concepts,designs, large DMs, novel concepts,algorithms, simulationsalgorithms, simulations
1000010000 Observ. & science ops.Observ. & science ops. System operations (studies, requirements)System operations (studies, requirements)
1100011000 InstrumentationInstrumentation Point designs, ADCPoint designs, ADC
1200012000 Site characterizationSite characterization Site parameters, measurements,Site parameters, measurements, [site testing equipment] [site testing equipment] modeling, large scale atmo. propertiesmodeling, large scale atmo. properties
1300013000 System layout,System layout, Integrated modelling tools, support to Integrated modelling tools, support to analysis & modellinganalysis & modelling other WPsother WPs
NoNo TitleTitle TopicsTopics Breadboard / prototypesBreadboard / prototypes
0100001000 Project ManagementProject Management [includes overall system / project engineering][includes overall system / project engineering]
0400004000 Wavefront ControlWavefront Control Phasing, actuators, metrology, Phasing, actuators, metrology, APE, WEB (wind)APE, WEB (wind)PSF properties, high contrastPSF properties, high contrastimaging, error budgetingimaging, error budgeting
0500005000 Optical fabricationOptical fabrication SiC, opt. finishing, Al mirrors, coatings SiC, opt. finishing, Al mirrors, coatings 8 x 1-m SiC segments8 x 1-m SiC segments
0600006000 MechanicsMechanics Composite materials, MagLev,Composite materials, MagLev, Friction Drive breadboardFriction Drive breadboardFriction drivesFriction drives
0700007000 ControlControl Support to other WPs (APE, WEB)Support to other WPs (APE, WEB)
0800008000 Enclosure & infrastr. Enclosure & infrastr. Enclosure concepts, renewable Enclosure concepts, renewable energies, infrastructures, wind tunnelenergies, infrastructures, wind tunnel
0900009000 Adaptive OpticsAdaptive Optics WFE on 100-m scale, AO units WFE on 100-m scale, AO units DM prototypesDM prototypesdesigns, large DMs, novel concepts,designs, large DMs, novel concepts,algorithms, simulationsalgorithms, simulations
1000010000 Observ. & science ops.Observ. & science ops. System operations (studies, requirements)System operations (studies, requirements)
1100011000 InstrumentationInstrumentation Point designs, ADCPoint designs, ADC
1200012000 Site characterizationSite characterization Site parameters, measurements,Site parameters, measurements, [site testing equipment] [site testing equipment] modeling, large scale atmo. propertiesmodeling, large scale atmo. properties
1300013000 System layout,System layout, Integrated modelling tools, support to Integrated modelling tools, support to analysis & modellinganalysis & modelling other WPsother WPs
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From concept to sky testing: APE
Active Phasing Experiment
Segmenting the VLT
Laboratory & on-sky evaluation of up to 3 phasing techniques
Integration of phasing into global wavefront control
On-sky by 2007
Active Phasing Experiment
Segmenting the VLT
Laboratory & on-sky evaluation of up to 3 phasing techniques
Integration of phasing into global wavefront control
On-sky by 2007
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WEBWEBWEBWEB
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Silicon Carbide prototypesSilicon Carbide prototypes
1-m class, 8 pcs., different overcoatings1-m class, 8 pcs., different overcoatings 4 blanks already at ESO4 blanks already at ESO Explore overcoating & figuring processes,Explore overcoating & figuring processes,
check for bimetallic effectscheck for bimetallic effects AdvantagesAdvantages
– Stiffer, lighter, better thermo-mechanicalStiffer, lighter, better thermo-mechanicalproperties (than glass)properties (than glass)
– Higher control bandwidth (position)Higher control bandwidth (position)
– HardnessHardness
– Lighter, stiffer telescope structureLighter, stiffer telescope structure
– ~20 years of development, space-qualified~20 years of development, space-qualified
– Potentially cost-effective if appropriate designPotentially cost-effective if appropriate design
BUTBUT– Needs qualification for segmented aperturesNeeds qualification for segmented apertures
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Friction drive breadboardFriction drive breadboard
Mandatory – Hydraulic pads / tracks not an option !Alternative: magnetic levitation - TBD
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Overall scheduleOverall schedule
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ELT Design Study – subcontracts (planned)
Subject Contact email
Design & testing of 18 segments position actuators
E. Brunetto,
ESO
Feasibility study for magnetic levitation (telescope kinematics)
E. Brunetto,
ESO
Conceptual design of opening enclosure for a 50- and a 100-m telescope
G. Pescador,
GRANTECAN
Wind studies – CFD L. Noethe, ESO
M. Quattri, ESO
Wind studies – wind tunnel Idem Idem
Site characterization equipment J. Vernin,
LUAN
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Contacts @ ESO
OWL J. Strasser, [email protected]
Telescope Systems Division, Project Controller
P. Dierickx, [email protected]
Project Engineer / Manager R. Gilmozzi, [email protected]
Prime Investigator E. Brunetto [email protected]
Optomechanics
ELT Design Study P. Dierickx [email protected]
Project Manager R. Gilmozzi [email protected] Project Coordinator
OWL J. Strasser, [email protected]
Telescope Systems Division, Project Controller
P. Dierickx, [email protected]
Project Engineer / Manager R. Gilmozzi, [email protected]
Prime Investigator E. Brunetto [email protected]
Optomechanics
ELT Design Study P. Dierickx [email protected]
Project Manager R. Gilmozzi [email protected] Project Coordinator
