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Fast E2E simulation tools and calibration strategies for EAGLE-MOAO on the E-ELT. Manal Chebbo, Alastair Basden , Richard Myers, Nazim Bharmal , Tim Morris, Thierry Fusco, Jean-Francois Sauvage.

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Fast E2E simulation tools and calibration strategies for EAGLE-MOAO on the E-ELT

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Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

Fast E2E simulation tools and calibration strategies for EAGLE-MOAO on the E-ELT

Manal Chebbo, Alastair Basden, Richard Myers, NazimBharmal, Tim Morris, Thierry Fusco, Jean-Francois Sauvage

Manal Chebbo AO4ELT3 30 May 2013


Dasp vs e2e s durham ao simulation platform vs e2e sparse lam onera

DASP VS E2E-SDurham Ao Simulation Platform VS E2E- Sparse (LAM / ONERA)

  • Conventional MVM dense

  • Sparse methods utilized.

  • Atmosphere to Slopes slow but accurate model.

  • Typically needs to run for several hours to simulate 10 – 100 s of operational time, but with high fidelity…

  • Sparse methods only.

  • Atmosphere to Slopes fast but approximated model.

  • Speed comparable to analytical codes, but capabilities of E2E codes, for ex: Optical tolerance studies…

Chebbo et al 2011

AO4ELT2

Basden et al 2007

Manal Chebbo AO4ELT3 30 May 2013


Synopsis

Synopsis

  • Sparse E2E Simulator

  • DASP Simulator

  • Conclusion and Perspective

Manal Chebbo AO4ELT3 30 May 2013


Synopsis1

Synopsis

  • Sparse E2E Simulator

  • DASP Simulator

  • Conclusion and Perspective

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Sparse E2E Simulator

  • AO in blocks

Configuration system

Turbulent generator

WFS model

Tomographicreconstructor

DM model

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Sparse E2E Simulator

  •  Description of the different modules

  • Configuration System

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Sparse E2E Simulator

  •  Description of the different modules

  • Turbulence generator

  • Generate layers in the form of pixilated phase screen

  • Simulation and computation of white noise FT

  • Inverse FT → real part

  • d/r0

  • Wind speed, direction for the considered layer

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Sparse E2E Simulator

  • Description of the different modules

  • Wave Front SensorSparse-Model

  • RealisticsparseGeometry Model of Shack-Hartman WFS

  • Illuminated and partlyilluminatedsubapertures are managed

  • RCO/RCO_d FORMAT :

    (Representation Complete and Ordered)

    Ds = {rco}

    Ds.r = 2* Ns2

    Ds.c = N2

    Ds.n = 4* nb_pix* Ns2

    Ds.ix = ptr_new([0,make_array(D.r, /long)])

    Ds.jx = ptr_new(lonarr(D.n + bandwidth))

    Ds.xn = ptr_new(make_array(D.n+ bandwidth, /float))

400 subapertures / 308 are fully or partlyilluminated in the pupil

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Sparse E2E Simulator

  • Description of the different modules

  • SparseWave Front Reconstruction

  • Sparse noise covariance matrix Cn

  • Noise are not correlated

  • noise is uniform

  • Turbulence covariance matrix

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Sparse E2E Simulator

  • Description of the different modules

  • Deformable Mirror sparse-Model

  • DM with sparse influence functions

  • Ifs profile ~ double Gaussian

  • IF = 0 beyondNacinf

  • Fs→ RCO→ [ N2 , Nact-valid]

64*64 actuators , Nacinf= 4 Nacinf= 6

  • 30% of mechanical coupling for minimizing the fitting error.

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Sparse E2E Simulator

  • Challenges of AO with Tomography

  • Tip, Tilt and Defocus Indetermination

  • Goal: Generate realistic WFS measurement’s with filtered out TTF

  • We modify the slopes to remove any tip tilt or defocus

Manal Chebbo AO4ELT3 30 May 2013

S

TTF


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Sparse E2E Simulator

  • Challenges of AO with Tomography

  • Tip, Tilt and Defocus Indetermination

  • We search the transformation matrix M to an orthogonal space whichexludes TTF

  • 2 methods present :

  • Setting mean slopes to zero.

  • M contain all the modes generated by the AO system.

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Sparse E2E Simulator

  • Challenges of AO with Tomography

  • Tip, Tilt and Defocus Indetermination

Subtraction of averageslopes

Method-1

  • TT is reduced to 7%

  • Defocus is not filtered

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Challenges of AO with Tomography

  • Tip, Tilt and Defocus Indetermination

  • M contains the WFS answer to all the modes generated by the system

Method - 2

Karhunen–Loève

TTF are filtered out

Manal Chebbo AO4ELT3 30 May 2013


Synopsis2

Synopsis

  • Sparse E2E Simulator

  • DASP Simulator

  • Conclusion and Perspective

Manal Chebbo AO4ELT3 30 May 2013


Dasp vs e2e s

DASP VS E2E-S

  • Conventional MVM dense

  • Sparse methods utilized.

  • Atmosphere to Slopes slow but accurate model.

  • No, Simple only TT

  • Sparse methods only.

  • Atmosphere to Slopes fast but approximated model

  • TTF filtered out.

Chebbo et al 2011

AO4ELT2

Basden et al 2007

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • DASP

  • Durham AO Simulation Platform

  • Python and C

  • MPI, shared memory, and multi-threaded

  • Suitable for ELT-scale problems

  • Cross checked with other codes: Octopus (42 m), YAO (4.2 m), Fourier (ONERA) (42 m)...

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • DASP

  • EAGLE E2E DASP-simulations

  • Simulation Parameter:

  • 42 m, central obscuration = 6 m

  • R0 = 13.5 cm @ 500 nm.

  • L0= 30 m

  • SH With 84*84

  • LGS closed loop GLAO with M4 and the same with open loop correction on the MOAO DM

  • 40 s of telescope time (10000 iterations)

  • No NGS , 6 LGS in a regular hexagon

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • DASP

  • EAGLE E2E DASP-simulations

H-band Ensquared energy in 75mas over the field of view. 6 LGS at 7.3arcmin diameter

6 LGS, 7.3 arcminute diameter

Strehl Map

Manal Chebbo AO4ELT3 30 May 2013


Actuators required

  • DASP

  • EAGLE E2E DASP-simulations

Actuators required

  • By making use of global M4 GLAO correction

    • Can reduce requirements for MOAO DMs

    • MOAO can be relaxed somewhat without dramatically affecting AO performance.

      • To ones that can be bought today!

Manal Chebbo AO4ELT3 30 May 2013


Alignment tolerance

  • DASP

  • EAGLE E2E DASP-simulations

Alignment tolerance

Rotational tolerance

  • Steep fall with rotation

  • 0.2 degrees

    • ~1/8thsubap at edges

  • Lateral misalignment reduces performance

    • Up to 1/8th of a sub-aperture has small effect

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

  • Conclusion:

  • Current Project is to produce a new validated rapid E2E simulation which combines the speed advantages of analytic codes with the ease performing engineering tolerance analysis, for example: Rotational and misalignment

  • Future Work:

  • Cross check the codes

  • New user interface for E2E-S code

  • Aim to produce a new form of systems engineering for ELT scale AO problems.

Manal Chebbo AO4ELT3 30 May 2013


Fast e2e simulation tools and calibration strategies for eagle moao on the e elt

Thank You

Manal Chebbo AO4ELT3 30 May 2013

23


Comparison with other codes

Comparison with other codes

Manal Chebbo AO4ELT3 30 May 2013


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