a global approach to elt instrument developments

A global approach to ELT instrument developments

J.-G. Cuby

for the French ELT WG

FP7

• “The construction of an Extremely Large Telescope on a competitive time scale will be addressed by radical strategic planning…” (Council resolution)

Calls for a schedule compatible with other projects, TMT, GMT, ALMA, JWST, etc.– Assume 2016

Calls for forefront instrumentation– Key to science, e.g. the VLT success

• Reverse schedule:

• FP7 (2008-2012) in parallel with the instrument study

• No time left for generic studies for the first generation instruments

First / Main instruments need to be started NOW (2-4 years of demonstration)

ELT Instruments: timeline

A key word: demonstration• Some concepts for workhorse ELT instruments remain to be demonstrated

– E.g. MOAO, XAO instruments

• Demonstration requires focused and integrated studies at system level– Science

• Top Level Requirements, Simulations, Simulators, Data Reduction, etc.– Adaptive Optics

• TLRs, Simulations feeding science, AO system analysis, tests on existing systems, etc.– Instrumentation

• TLRs, concepts, interfaces with AO, at least 2 prototyping cycles, etc.– System

• Putting it all together, budgets, etc.– Demonstrators, either in lab (e.g. AO benches) or on-sky (e.g. VLT)

• Synergy with transverse AO developments– Requirements– Interfaces

• Synergy with telescope developments– Interfaces: focal plane, f ratio, back focal distance, platforms, ADCs, field of view

(scientific & technical), LGS, etc.

A key word: demonstration

• Demonstration by:– Study (simulations, concepts, etc.)– Prototypes– Demonstrators (benches, on-sky, etc.)

• Demonstrations on existing infrastructures (e.g. VLT) for the next infrastructures– Develop new demonstrators in lab or on sky– Use existing or planned instruments as demonstrators (e.g. SPHERE)

• Structuring activity– Teams with various competence, etc– Access to lab, possibly sky, demonstrators– Networks highly desirable, e.g. for the science activities

• FP7: ideal for the demonstration phase – until instrument FDR (~ 2012)– JRAs, networks, access (to demonstrators)

Examples

• WFSPEC, MOMFIS etc.– ‘High-z’ and mass assembly of

galaxies

• Complex

• To be demonstrated (MOAO)

• Major interface aspects with telescope and AO, etc.

ExamplesMOMFISWFSPEC

WBS for theInstrumentstudy

Demonstrators

Example: MOMFIS / WFSPEC demonstration

• Potential Participants: F, UK, I, tbd.

• Timescale: 2008-2012 for the bulk of the activities

• Cost: ~ 8 M€ all inclusive (included in N. Hubin’s presentation)

• Deliverables: reports, conceptual studies, several prototypes (hw & sw), Demonstrators (1 bench, 1 VLT)

• Industrial dimension: interest in short term applied R&D

• EU dimension: use of existing infrastructures, demonstration for future infrastructures, structuring activity, synergy with ELT Design Study

EPICSA Planet Finder

instrument for the European ELT

(slides from J.-L. Beuzit)

EPICS Design philosophyEPICS Design philosophy

General approach -> Integrated conceptGeneral approach -> Integrated concept Science-driven: detection of exoplanetsScience-driven: detection of exoplanets Very detailed system analysisVery detailed system analysis Lessons learned from SPHERE on VLT (as Lessons learned from SPHERE on VLT (as

demonstrator)demonstrator) Globally optimized instrument (AO, corono, focal WFS Globally optimized instrument (AO, corono, focal WFS

control, observing modes)control, observing modes) Open concept, explore several options (corono, IFS...)Open concept, explore several options (corono, IFS...) Settle on well-established competences distributed in Settle on well-established competences distributed in

the XAO communitythe XAO community Extensive simulations -> end-to-end model Extensive simulations -> end-to-end model Prototyping, validations, test benches, demosntratorPrototyping, validations, test benches, demosntrator

EPICS Design StrategyEPICS Design Strategy

Spatially Filtered

SH

Advanced PYR

Experiments Simulations

FP6Point designSimulations experiments

EPICS SystemDimensioning

Prototypes

Conceptual& Preliminary

Design Reviews

HOT extension Aggressive

Calibration &Post-processing

Active suppressionof Systematic

specklesTheory SPHERE

feedback

Conclusions• FP7 to support the design phase of E-ELT instruments in period

2008-2012 (JRAs, network & access)

• Global approach to instrument developments highly desirable– Better focus, better synergy– Allows smaller (integrated) teams– Higher efficiency, faster

• Structuring activity

• Not exclusive of transverse / generic activities– Activities in essence transverse, e.g. detectors, etc.– Upfront activities with longer development timescales

• Synergy with ELT DS– Instrumentation currently severely under funded

• Which call ? Preparatory phase or I3 ?