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WAVEFRONT CHARACTERIZATION CAMPAIGN AT PARANALDECEMBER 2007

Using

DIMM-MASS-GSM-MOSP-LuSci & SCIDAR

ESO/LUAN/IAC/CTIOJoint effort

2

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THE GOALS OF THE CAMPAIGN

ELT-DS (EU-FP6) funds Understand the properties of the optical

turbulence at ELT scales (which model for L0?)

Understand the transition from free air to telescope enclosure

Cross-correlate various instruments used in site surveys, establish confidence levels

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3

Instruments’ baselines or diameters

2m

GSMMOSPSCIDARLUSCIMASSDIMM

8m

AO WFS: NACO Interferometry: AMBER

Kolmogorov / von Kàrmàn von Kàrmàn??

Nice & ESO ESO & ONERA ESO

Spatial scales at which turbulence is probed by different instruments

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Instruments and expected parameters

MASS-DIMM (CN2(h), e0, t0)

LUSCI (CN2(h))

SCIDAR (CN2(h),v(h), e0, q0, t0)

MOSP (L0(h), CN2(h), e0)

DIMM (e0, t0)GSM (e0, L0, q0, t0)NACO (e0, L0, t0)AMBER (OPD, e0, L0)

CN2 : structure constantL0 : outer scaleV : wind speedε0 : seeing

θ0 : isoplanatic angleτ0 : coherence time

CORRECTION FROM GROUND (6M) TO ELT (50-100M)

Seeing conditions are monitored at lower height above ground Direct measurement of the

surface layer turbulence properties in the first 100m

Indirect estimations:UT-DIMM comparisonMASS-DIMM comparisonSLODAR-MASS-DIMM comparisonLuSci-MASS-DIMM-GSM

comparison

50-100m

DIMM UT ELT

6m

30m

?

Sym

posiu

m o

n s

eein

g,

Kon

a M

arc

h 2

007

-

- S

lid

e 5

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6

N

E

Cute-SCIDAR location at Paranal

The Paranal Astronomical Site Monitor is located on the platform, in a zone diametrically opposite to the Control Building, just behind the VST.

The CUTE-SCIDAR@AT4 is located on the platform, in VLTI J2 Station.

WHERE?

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Cute-SCIDAR at Paranal (AT4 focus) for E-ELT Site Characterisation (Vázquez Ramió et al; The Messenger 132 – June 2008)

INSTRUMENT COMMISSIONED IN NOVEMBER 2007

Data collected during 20 nights between November and December 2007

December acquisitions included in the Navidad Campaign

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Meteo, DIMM, GSM and MOSP, MASS and LuSci

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DIMM, GSM and MOSP

SCIDAR-----

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Synchronous acquisitions

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GSM and MOSP (Borgnino & al, this conference)…& nearby buildings

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LUSCI - J. Beckers, 1993 & this conference- P. Hickson, 2004 & this conference- A. Tokovinin SPIE 7013, 2008

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MASS-DIMM on C11 tube and ASTELCO mount

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8TURBULENCE PROFILES FROM MASS

The altitude weighting functions of MASS and SCIDAR are of different physical nature

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Cute-SCIDAR@AT4 on VLTI J2 Station

- 300 m vertical resolution

- layers sensed between the ground (pupil) and 22.5 km above pupil (about 78 layers sensed each 25 seconds)

- Cn2 for each layer (GL +

FA)

- Isoplanatic Angle

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SCIDAR real time analysis and first post-processing

Real time turbulence evolution including and excluding dome turbulence (see Fuensalida et al. 2008, MNRAS, 389, 731)Direct correlation with Seeing from other Profilers or Monitors, wind speed and wind direction

Recombination of the turbulence profile in a “MASS-like” structure for immediate comparison

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8RESULTS 2007-12-17

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8RESULTS 2007-12-18

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8RESULTS 2007-12-19

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8RESULTS 2007-12-20

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8RESULTS 2007-12-21

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8RESULTS 2007-12-22

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8RESULTS 2007-12-23

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8RESULTS 2007-12-24

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MASS vs Cute-SCIDAR “MASS-like” structure: X-Comparison

- 300 m vertical resolution

- layers sensed between the ground (pupil) and 22.5 km above pupil (about 78 layers sensed each 25 seconds)

- Cn2 for each layer (GL

+ FA)

- Isoplanatic Angle

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MASS vs Cute-SCIDAR “MASS-like” structure: X-Comparison

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MASS vs Cute-SCIDAR “MASS-like” structure: X-Comparison

- clocks from the two instruments are synchronized within few seconds

- data are 1 minute averages in one night

- Cute-SCIDAR averages are synchronized no more than ± 30 sec with respect to MASS data

more work needed!!!