Roberto Gilmozzi

1
The European ELT
Phase B status

• Roberto Gilmozzi
• EELT Principal Investigator
• Astronet Roadmap Symposium, Liverpool 16-19 June
  2008

2
ESOs Strategic Principles
ESO Council Resolution, Dec.2004

• Retention of European astronomical leadership
  into the era of Extremely Large Telescopes
• Assure completion of ALMA, and efficiently
  exploit its superb scientific capabilities
• Maintain VLT in world-leading position for
  another 10-15 years by continued upgrades
• Exploit unique capabilities of the VLTI

• Lead in the construction of an ELT on a
  competitive timescale

ELT effort re-oriented at the end of 2005 towards
the best affordable ELT Facility that can be
built on a competitive timescale and with
acceptable risks
3
E-ELT at a glance

• A project lead by ESO on behalf of 14 member
  states
• 42m adaptive telescope with segmented primary
  based on a 5 mirror design
• Schedule
• Detailed design phase until mid-2010
• Start of construction 2010
• First light 2017
• Cost
• Telescope incl 1st gen instruments 950 million
  Euros
• Operations (incl new instruments) 50 M/year

4
The Phase B

• Goal
• Proposal for construction to Council by June 2010
  
• Resources
• 2007-2009 phase B 57.2 M (including 110 FTEs)
• 2008-2011 5 M for EELT related RD (non
  construction related)
• Supporting design activities from FP6 (28.8 M)
• Preparatory construction support from FP7 (6.1
  M)
• Telescope (70 phase B budget committed)
• Several industrial contracts running (some
  completed)
• Second Baseline consolidation meeting in March
  2008
• Instrumentation
• 10 Phase A conceptual studies running (8
  instruments, 2 post-focal AO systems), with
  reviews scheduled for end of 2009
• Design Reference Mission
• End-to-end simulations of test cases, simulations
  of prominent science cases, compilation of
  hundreds of use cases

5
Programme organization
6
The Telescope
7
The BRD optical design. Improved with respect to
Marseille making M2 smaller and the telescope
performance even better.
8
The telescope mountTwo industrial contracts
concluded. Confirm cost and schedule for the
mount and improve the performance with respect to
the BRD presented in Marseille.
Azimuth track
Altitude cradle
9
Analysis. Ongoing at ESO and within the
community. Contract with Lund for integrated
modelling.
Sophisticated FEM 82517 ELEMENTS 28817 NODES
10
The primary
2 x 7 prototype segments being produced by two
independent contractors. Production processes
being developed under contract to ESO
1148 segments 984 mirror 1 spare/family
27 point wiffle tree designed by industry under
contract to ESO.
11
The primary auxiliary unitsEdge sensors
developed, actuators developed, mirror support
designed.
Segment dimensions 1428.64 mm - 1414.00
mm (1387.29 - 1427.13 _at_pupil) central thickness
50 mm gap 4 mm bevel 2 mm (goal 1.5)
Edge sensors
dynamical simulations
Lab tests
12
The secondary unit.Cell preliminary design
contract kicked off (yesterday). Mirror design
production contract in the tendering phase.
13
The M4 adaptive mirrorTwo industrial contracts
running to PDR during phase B. Unit will be
ready for construction in 2010.
14
The M5 field-stabilization mirror
unitPreliminary design contract
ongoing.Suppliers for the mirror identified.
15
The enclosure (dome)Two preliminary design
contracts concluded providing schedule and cost.
Definition of ICDs for maintenance and
operations ongoing
16
Instrumentation

• Telescope-instrument ICD defined.

17
Instrument concept studies
18
Adapters
Both natural and laser guide star probes in one
adapter
19
The Nasmyth platform
20
Lasers
21
Site characterizationSelection by end 2009
22
Conclusions

• The EELT is in the detailed design phase
• The Phase B is proceeding well
• On time and in budget
• First consolidation with industry
• Mitigation of cost and schedule uncertainties.
• Subsystem costs from industry within global BRD
  envelope.
• Construction timescales for subsystems compatible
  with global project schedule.
• If approved, construction will take seven years
• First light possible in 2017