Technology Developments for ESO at the IAC

Instituto de Astrofísica de Canarias1Ramón J. García López

Technology Developments for ESO at the IAC

Ramón J. García LópezHead of Technology Division

Jornada ESO 2011, Granada, 10-11/02/2011

2Instituto de Astrofísica de Canarias

2Ramón J. García López

Technology involvement in ESO

Instruments:– Espresso for the VLT– CODEX and HARMONI for the E-ELT

Technology development for the E-ELTE-ELT construction preparationFinal design of the E-ELT



High Resolution Ultra Stable Optical Spectrograph for the VLT

The work packages of the IAC within the consortium are:Fiber linkHardware System engineering

assistanceOptics procurement and MAIVSpectrometer Optomechanics, optical

benchSystem integration and verification

Optical bench

Vacuum vessel

ESPRESSO at the VLT



CODEX: COsmic Dynamics Experiment for the E-ELT

Radial velocity accuracy: 2 cm/s over 30 years

Wavelength calibration system: highly stable laser comb

Fiber scrambling: object and calibration

Synergy and experience with ESPRESSO: the CODEX precursor at the VLT



HARMONI

Optics– Design of the scale exchanger and K-

mirror (optic de-rotator)– Analysis of sensitivity and scattered light

Opto-mechanics– Design of different cryogenic mechanisms:

filters, stops and shutter– Design of mountings for all the optics

Electric and electronic interfaces



European Extremely Large Telescope (E-ELT)

UE FP6 contract led by ESO (2005-2009). – 27 participants (28 M€). IAC coordinated the

Spanish participation (4.5 M€).

Objective: Design studies to validate concepts and technologies for the E-ELT– APE– WEB– Site characterization– Dome and infrastructure



Active Phasing Experiment (APE)

Objective: developing and testing four different technologies for co-phasing of segmented mirrors, and control methods

Participants: ESO, IAC, INAF, LAM, FOGALE, GRANTECAN– First instrument with Spanish participation installed on one

VLT UT– IAC responsible for one of the co-phasing sensors (DIPSI)

and co-responsible of the other one (ZEUS) Results on sky with the UT-3 at Paranal

– Co-phasing of a 61 segments mirror with an stable rmserror of 7 nm

– Co-phasing under bad-seeing conditions (1.8”) and faint stars (m=14.5)

– Range of piston errors recovery of the segments down to 1.5 microns



Active Phasing Experiment (APE)



Wind Evaluation Breadboard (WEB)

Objective: telescope and primary mirror simulator for testing segment control under real wind situations

Participants: IAC, JUPASA, ALTRAN, ESO, GRANTECAN

Results on sky (operating at Teide Observatory)– Segments control under 100 nm rms– Suggestions to improve the mechanical design of

segments– Validation of “soft” actuators– Architecture for control software

Objective: telescope and primary mirror simulator for testing segment control under real wind situations

Participants: IAC, JUPASA, ALTRAN, ESO, GRANTECAN

Results on sky (operating at Teide Observatory)– Segments control under 100 nm rms– Suggestions to improve the mechanical design of

segments– Validation of “soft” actuators– Architecture for control software



10

First (tip) eigenmode at 62.9 Hz

First mode = 22.36 Hz

Wind Evaluation Breadboard (WEB)Wind Evaluation Breadboard (WEB)



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Wind Evaluation Breadboard (WEB)Wind Evaluation Breadboard (WEB)



Dome Conceptual Design

Objective: the development of two dome concepts at conceptual level

Participants: IAC, ESO, CIMNE, ITER, GRANTECAN– Phase 1: Four

concepts



Selection and development of two conceptual designs

Polygonal dome and spherical dome

- Preparation of technical specs and contracts developments

- One of the selected companies got the phase-A contract with ESO

Dome Conceptual DesignDome Conceptual Design



Dome’s wind studies

Objectives: Characterization of wind pressures on the building, the telescope and the optics, using both numerical models and a wind tunnel.

Participants: IAC, CIMNE, ITER



Dome’s wind studies

Dome 30º incidence angle: pressure and velocity field

Telescope model

Tunnel test of boundary layer



Objectives:– To develop an AO re-constructor based on FTR – To evaluate hardware platforms on real time for AO based on

FPGAs Participants: ESO, IAC, CRAL, ARCETRI, ONERA,

PADOVA Results:

– Use of the FTR re-constructor at the ESO AO simulator– Comparison of the FTR solution with other simulators: Computation needs drastically reduced Able to work with fainter reference stars More robust again errors between the wavefront sensor

and the deformable mirror

Adaptive optics developmentsAdaptive optics developments



Adaptive optics developmentsAdaptive optics developments



Site characterization

Objectives:– To establish the candidate sites for the E-ELT– To define the parameter space for turbulence,

meteorology and geology– Design and development of instruments to measure those

parameters in a standard way: MASS-DIMM and Generalized SCIDAR

– Routine observing campaigns in the different sites and analysis of the results

Participants: University of Niza, IAC, ESO, UPC



Site characterizationSite characterization



E-ELT construction preparation

Contract with the UE under the FP7, led by ESO. Participation of the IAC in several work packages (2008 – 2010)– WP05000: Science Access

Task 4: Observing conditions prediction tools– WP06000: Networks of Nodes of Expertise

Network 1: Advanced Cryogenic Techniques for ELT Observatory

Network 3: Ultra-accurate Wavelength Calibration Techniques of Cosmic Sources Spectra

– WP09000: Upgrade paths– WP09200: Large detector cryostat of high thermal

stability



Ultra-stable cryostat



Final design of the E-ELT

Participation of the IAC in several contracts with ESO for the final design – Phase A: preliminary design. 2007-2008

Primary Mirror Cell. Prime contractor: CESA. GRANTECAN and IAC subcontracted.

– Phase B: detailed design and prototype fabrication. 2009-2010 Position Actuators design for the primary mirror segments.

Prime contractor: CESA. IAC and GRANTECAN subcontracted.



Position actuators

90 Kg mass

PACT

PACT control electronics

Test PC

PC - Data acquisition

Laptop -Data processing

Isolated optical bench

-3D and test bench

-Motion error: less than 10 nm rms



Thanks!

Documents

Technology Developments for ESO at the IAC