- the ao modes for harmoni - from classical to laser...

- The AO modes for HARMONI -From Classical to Laser-assisted tomographic AO

systems

Benoît Neichel, Thierry Fusco, Carlos M. Correia, Kjetil Dohlen, Leonardo Blanco, Kacem El Hadi, Jean-François Sauvage, Noah Schwartz, Yoshito Ono, Fraser Clarke, Emmanuel Hugot, Miska Le Louarn, Niranjan A. Thatte, Matthias Tecza, Hermine

Schnetler, Ian Bryson, Angus M. Gallie, David M. Henry, Tim J. Morris, Richard M. Myers, Joël Vernet, Jérôme Paufique, Peter Hammersley, Jean-Luc Gach, Alexis Carlotti, Ariadna Calcines, Pascal Vola, Sandrine Pascal, Marc Llored, Dave Melotte,

Olivier Martin, Arlette Pecontal, Andrew Reeves, James Osbron, Matthew Townson

HARMONI Overview

Partner Associate Partner Responsibilities

University of Oxford STFC – RAL Space Spectrographs & Obs. Prep

STFC – UK ATC Edinburgh Univ. of Durham Cryostat, AIV, Rotator, LTAO

IAC, Tenerife Pre-optics & Electronics

CSIC – CAB (INTA), Madrid Calibration & Sec. guiding

CRAL, Lyon IPAG, GrenobleIRAP, Toulouse

IFU & Software

LAM, Marseille ONERA, ParisIPAG, Grenoble

SCAO, LTAO, High Contrast

HARMONI Consortium

HARMONI Overview

Partner Associate Partner Responsibilities

University of Oxford STFC – RAL Space Spectrographs & Obs. Prep

STFC – UK ATC Edinburgh Univ. of Durham Cryostat, AIV, Rotator, LTAO

IAC, Tenerife Pre-optics & Electronics

CSIC – CAB (INTA), Madrid Calibration & Sec. guiding

CRAL, Lyon IPAG, GrenobleIRAP, Toulouse

IFU & Software

LAM, Marseille ONERA, ParisIPAG, Grenoble

SCAO, LTAO, High Contrast

HARMONI Consortium

Thanks for hosting us this week !!

HARMONI Overview

First light ELT instrument

HARMONI = High Angular Resolution - Monolithic - Optical and Near-infrared - Integral field spectrograph

HARMONI Overview

First light ELT instrumentWorkhorse instrument - visible and near-infrared spectroscopy (0.5–2.4 µm)Integral Field Spectrograph – providing ~ 30 000 spectra per exposure

3D data cube

HARMONI = High Angular Resolution - Monolithic - Optical and Near-infrared - Integral field spectrograph

Bands Wavelengths

(μm)

R

“V+R” or “I+z+J” or “H+K”0.45-0.8, 0.8-1.35,

1.45-2.45~3000

“I+z” or “J” or “H” or “K”0.8-1.0, 1.1-1.35, 1.45-

1.85, 1.95-2.45~7500

“Z” or “J_high” or “H_high” or “K_high” 0.9, 1.2, 1.65, 2.2

(TBD)

~20000

HARMONI Overview

HARMONI = 3 resolving powers

3D data cube

HARMONI Overview

6.42” x 9.12”

3.04” x 4.28”

1.5

2”

x 2

.14

”

21

4 x1

52

spaxe

ls

0.61” x 0.86”

60 x 30 mas

20 mas

10 mas

4 mas

HARMONI = 4 spatial scales

3D data cube

HARMONI Overview

6.42” x 9.12”

3.04” x 4.28”

1.5

2”

x 2

.14

”

21

4 x1

52

spaxe

ls

0.61” x 0.86”

60 x 30 mas

20 mas

10 mas

4 mas

HARMONI = 4 spatial scales

Assisted with

Adaptive Optics

HARMONI: Two AO modes

High-Performance – Low sky coverage High-Performance & sky coverage

Single Conjugated AO Laser Tomography AO

x6

HARMONI

HARMONI, SCAO & LTAO implementation

HARMONI

Nasmyth Platform

Relay

Light from telescope

Telescope Pre-Focal Station

HARMONI Cryostat

Seeing limited

Focal plane

Re-imaged focal plane


HARMONI

Nasmyth Platform

Relay



HARMONI Cryostat

Seeing limited

SCAO WFS SCAOSCAO dichroic

Focal plane


HARMONI

Nasmyth Platform

Relay



HARMONI Cryostat

Seeing limited

NGS Pick-off SCAOLGS (<0

.6u

m)

LGSWFSModule

LTAO

Truth Pick-off

Dichroic


From Telescope

LGSWFS

SCAO & NGS WFS

IFS

HARMONI


HARMONI SCAO

SCAO system baseline is to use a pyramid WFS:

HARMONI SCAO

SCAO system baseline is to use a pyramid WFS Better performance & better sensitivity

+2 mag.

HARMONI SCAO


HARMONI SCAO

SCAO system baseline is to use a pyramid WFS Better performance & better sensitivity Managing the “Island” effect

HARMONI SCAO


50cm Spiders

See Noah Schwartz talk on Friday

HARMONI SCAO


See Noah Schwartz talk on Friday

HARMONI SCAO


Small modulation provides information on what’s behind the spider

+ Secret ingredient See Noah Schwartz talk on Friday

HARMONI SCAO


Small modulation provides information on what’s behind the spider

+ Secret ingredient See Noah Schwartz talk on Friday

Before After

Residuals less than

50nm

SCAO will provide a SR of >70% in K-band

HARMONI SCAO

High Contrast :Spectral characterization of young Jupiters around nearby stars in H & K bands at R=3000-20000, with a 10-6 contrast at 200mas.

From A. Carlotti, A. Vigan, D. Mouillet, M. Bonnefois

HARMONI SCAO

High Contrast :Simulated data of 4 planets w/ 10-6 planets contrast & 51 Eri b-like synthetic spectrum (2h exp. with H=6 star).

From A. Carlotti, A. Vigan, D. Mouillet, M. Bonnefois

LGSWFS

SCAO & NGS WFS

HARMONI


“High-Order Loop”

“Low-Order Loop”

HARMONI LTAO

LTAO Top-Level Specifications:

Strehl K > 60%

Jitter < 2mas

Sky Coverage >10% at the Pole

60 x 30 mas20 mas10 mas4 mas

EE (20mas) > 40%

Jitter < 5mas

Sky Coverage of >50% at the Pole

EE (40mas) > 50%

Jitter < 10mas


HARMONI LTAO


Strehl K > 60%

Jitter < 2mas



EE (20mas) > 40%

Jitter < 5mas


EE (40mas) > 50%

Jitter < 10mas


Set requirements on the LGS High-Order Loop

HARMONI LTAO


Strehl K > 60%

Jitter < 2mas



EE (20mas) > 40%

Jitter < 5mas


EE (40mas) > 50%

Jitter < 10mas


Set requirements on the LGS High-Order Loop

Set requirements on the NGS Low-Order Loop

90km − ZA=0

130km − ZA=45

180km − ZA=60

20 40 60 80

0.2

0.4

0.6

LGS Radius (arcsec)

SR

(K

−B

an

d)

R0 scaled

HARMONI LTAO

Optimal LGS constellation between R=[15-40]”

“Small” constellation greatly helps for tomographic error

Laser constellation

See Thierry Fusco talk on Thursday

HARMONI LTAO

Sensing on LGS

LLT

Sodium layer

Detectorplane

T ~ 20km

H ~ 80km

Distance from launch site

Pupilplane

Predicted spot elongation pattern

LLT

HARMONI LTAO

LLT

Detectorplane


Pupilplane

Dealing with spot elongation

25”

1”

Ideally, we need subapertureswith 25x25 pixels of ~1”

For 80x80 subapertures, we need 2000 x 2000 pixels

HARMONI LTAO

LLT

Detectorplane


Pupilplane

Dealing with spot truncation

Most likely, we will have no more than 10x10 pixels

Strong truncation

HARMONI LTAO


Truncation induces biases that are

projected on-axis by the Tomography

See Leo Blanco talk on Thursday

x6

Up to 300nm

HARMONI LTAO


One way to reduce this impact is to reject the

truncated measurements

See Leo Blanco talk on Thursday

x6

Down to 80nm

Temporal frequency [Hz]10

-210

-110

010

110

2

|Y(f

)|2/H

z

10-10

10-5

Single-Sided Amplitude Spectrum of y(t)

PSD ATM

PSD WS

HARMONI LTAO

Sensing on NGS

Main offender is the telescope Windshake

Atmosphere = 15 masWindshake = 263 mas

But windshake is isoplanatic:

we can use the telescope WFS

to reduce it

HARMONI LTAO

Sensing on NGS

2x2 Shack-Hartmann8 mas / pixel

125 pixel / subap.500 Hz

1.2 to 2.2 microns

Jitter control strategy:• Use “bright but far” stars to compensate windshake with

telescope WFS • Use “faint but close” star to compensate atmospheric jitter

HARMONI LTAO

Sensing on NGS

2x2 Shack-Hartmann8 mas / pixel

125 pixel / subap.500 Hz

1.2 to 2.2 microns

Jitter control strategy:• Use “bright but far” stars to compensate windshake with

telescope WFS • Use “faint but close” star to compensate atmospheric jitter

0 5 100.0

0.2

0.4

0.6

0.8

jitter (mas)

Sky C

ov.

10% Sky Cov. for 2mas

South galactic Pole



Sensing on NGS

HARMONI LTAO See Carlos Correia poster on Thursday

Cosmos Field

LTAO 1NGS

−0.1 0.0 0.1 0.2

0.1

0.2

0.3

0

1

2

3

4

6

7

8

9

10

11

jitt

er

[ma

s]

RA + 150.05 [deg]

DE

C +

2.1

7 [

deg

]

Sensing on NGS

HARMONI LTAO

GoodS Field

LTAO 1NGS

Old ESO profile

0.0 0.1 0.20.0

0.1

0.2

0

1

2

3

4

5

6

7

9

10

11

12

13

14

15

16

jitt

er

[ma

s]

RA + 53.00 [deg]

DE

C +

−2

7.9

4 [

de

g]

See Carlos Correia poster on Thursday

The NGS strategy fulfills the science requirements for all observations

Conclusion: HARMONI schedule

12/2017

PDR

2019

FDR

2023

MAIT

2024: integration at the telescope

Dr. Frans Snik

2024: 1st light !

Conclusion: HARMONI schedule

12/2017

PDR

2019

FDR

2023

MAIT

- The AO modes for HARMONI -

1 more slide beforeCoffee Break !

Register now, for the 2 to 4 October 2017 in Padova, Italy

https://www.ict.inaf.it/indico/event/521/

Register now, for the 2 to 4 October 2017 in Padova, Italy

https://www.ict.inaf.it/indico/event/521/

Marseille 2016

HARMONI SCAO


151397 17

- the ao modes for harmoni - from classical to laser...

Documents