CFHT , Instruments , Imaging , AOB , Workshop

PUEO NUI Workshop

held at the

Laboratoire d'Astrophysique de Grenoble (LAOG), France


22-23 May 2003

May 25th 2004 - Deadline for On-line proceedings: June 15th 2004.

Organizing Committee:

Olivier Lai (CFHT), François Ménard (LAOG), David Bohlender (HIA),
Jean-Charles Cuillandre (CFHT), Eduardo Martin (IfA) & Jean-Luc Beuzit (LAOG)

Primary Contacts:

LAOG Local Organizer: François Ménard (
CFHT Primary Contact: Olivier Lai (


Workshop Organization and Registration

At the request of the CFHT Scientific Advisory Council, CFHT staff and Pueo Nui enthusiasts have organized a Pueo Nui Workshop to be held at the Laboratoire d'Astrophysique, Grenoble, France on 22-23 May 2003. The goal of the workshop is to encourage discussion of science drivers, technical requirements, and the possible instrument suite for Pueo Nui, as well as to discuss the timeliness of this project with respect to other high-resolution imaging projects being pursued at other major astronomical facilities.

To register, simply contact Dr. François Ménard (LAOG) directly at the following email address: . Please use if possible the following title to help him sort things out easily: "PUEO NUI Workshop Registration". The registration email should at least contain your full name and institution.

Note that because of space limitations, participation in the workshop will be limited to approximately 70 attendees. Please do register only if you are sure to attend so we don't end up missing some participants - thank you for your understanding.

This is a workshop between us, the community, and we rely on your willingness to take care of your travel and lodging arrangements. Participants are kindly asked to make their own hotel bookings. F. Ménard kindly pre-booked 10 rooms in each of the following hotels (Hotel de l'Europe, Hotel Touring - just mention you're from the Observatoire de Grenoble and you're on), see the "Hotels" section in this page to book a room with them directly (a total of 6 hotels are listed).

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Project Description

PUEO NUI is a proposed upgrade of the CFHT Adaptive Optics Bonnette. The current performance of the 19 degrees of freedom system is a delivered Strehl ratio of around 60% in K band (40% in H, 20% in J) and modest seeing improvement in the visible. The proposed upgrade would increase the numbers of degrees of freedom to approximately 100 and is expected to provide Strehl ratios >90% in the K band and diffraction limited performance down to the R band (Strehl ~ 40%, FWHM ~ 40 mas). Even performance in V band, while not diffraction limited, would allow resolutions of 30 mas. The PSF in the infrared would also be much more stable as the variations of the Strehl ratio are proportional to the amount of uncorrected phase. This set of performance opens up the field of high dynamic range imaging by providing exquisite and stable image quality, required by phase coronographs and other PSF subtracting techniques. The limiting magnitude of such a system is necessarily degraded, and it is expected that the maximum performance limiting magnitude will be around 7 or 8. Fortunately, the faint limiting magnitude will not be altered by this upgrade with respect to PUEO, so the current faint guide star science will still be available.

More information on PUEO NUI can be found in the following papers in PDF format (they look good when printed):

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Astronomical adaptive optics is currently developing in two seemingly orthogonal directions: Multi-conjugate adaptive optics, and High dynamic range AO. Both of these techniques seek to further performance of AO against its main limitations, namely sky coverage for the former, and unstable PSFs or partial correction for the latter. These directions are not as orthogonal as they first appear as successful demonstration of both of these techniques is indeed a requisite for the adaptive optics systems of future giant telescopes. MCAO actually gets easier on larger telescopes (the requirements on guide stars for the tomography decreases with the size of the telescope) while HDRAO, in some ways, benefits from smaller telescopes for obvious reasons, as the number of degrees of freedom goes as D^2 but also for less obvious ones such as the possibility of using a laser guide star to compensate for the low maximum performance magnitude.

High dynamic range (and visible) AO projects are being proposed for the VLT and Keck telescopes. The main advantage of going to large telescopes is that the achievable contrast at a given distance from the guide star - everything else being equal - depends on D^2. However, these will be instruments with tens of thousands of degrees of freedom, that will certainly require new technology. One of the strong drivers for PUEO NUI is therefore to ensure that there are no fundamental limitations to High Dynamic Range AO - or that if there are, they are identified early and corrective procedures can be applied to the larger instruments.

But the main purpose of PUEO NUI is not to be a demonstrator or a test bench for Extreme AO, but indeed to be an instrument in its own right. The performance obtained through simulations demonstrates that several forefront science areas would benefit tremendously from a better corrected PSF, or access to shorter wavelengths. Also, new instruments such as phase cornographs or multi-wavelength imagers benefit and/or require very high Strehl ratios to produce significant science.

It has therefore been suggested to gather interested parties, experts and potential users of the Canadian, French and Hawaii communities for a workshop, to discuss whether, given the current orientation of the 4 meter class telescopes, and CFHT in particular, such an upgrade of PUEO would be warranted. This decision should guided by the community of users with expertise available from the potential developers.

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Laboratoire d'Astrophysique, Grenoble, France
Large Conference room (max attendance at LAOG: 70 persons)

DAY 1: May 22nd, 2003 ( 10h00 -> 18h15 )

10h00 - 10h05: Welcome: Director of LAOG ( Montmerle / LAOG )

10h05 - 10h10: Introduction: as viewed from the Board of Directors
( Rouan / Meudon )

10h10 - 10h20: Introduction: Director of CFHT ( Veillet / CFHT )

I- PUEO NUI and its environment

10h20 - 11h00: Description of PUEO NUI and numerical simulations of
expected performances ( Lai / CFHT )

11h00 - 11h15: coffee break
( 11h00-12h00 -> Seminar at IRAM by Gaspard Duchene UCLA )

11h15 - 11h35: Stability of telescope ( Puget / CFHT )

11h35 - 11h55: Cameras available/ need for new ones ( Cuillandre/CFHT )

11h55 - 12h15: Gain for OHANA ( Woillez / Meudon )

12h35 - 14h00: Lunch Break


- Extra-Galactic Science

13h45 - 14h05: QSO host galaxies ( Petitjean / IAP )

14h05 - 14h25: Deep fields near bright stars ( Soucail / OMP )

- Galactic Population, Structure and Dynamics

14h25 - 14h45: The Galactic center ( Maillard / IAP )

- Stellar Physics / Galactic population

14h45 - 15h05: Very Low Mass Stars and Brown Dwarfs ( Liu / IfA )

15h05 - 15h25: Fundamental Stellar Parameters ( Beuzit / LAOG )

- Star and Planet Formation

15h25 - 15h45: Exoplanets ( Lagrange / LAOG )

15h45 - 16h05: Debris disks ( Augereau / Leiden )

16h05 - 16h25: Protoplanetary Disks around solar like stars
( Menard / LAOG )

16h25 - 16h55: coffe break

16h55 - 17h15: Mass-Loss in YSO's ( Dougados / LAOG )

17:15 - 17h35: PMS Binaries ( Duchene / UCLA )

- Other important topics

17h35 - 17h55: Solar System Science ( Dumas / JPL )

17h55 - 18h15: Interest for Spectroscopy ( Monin / LAOG )

END of DAY 1

DAY 2: May 23rd, 2003 ( 9h00 -> 16h30 )

III- Relevant Instrumentation

9h00 - 9h30: Gain for Coronography ( Soummer/ Nice )
Corono 4-quadrants, CIA, phase mask...

9h30 - 9h50: SPID (optical, Halpha specklegraph) ( Foy / Lyon )

9h50 - 10h10: Dual beam Imaging - TRIDENT ( Doyon / Montreal )

IV- AO Hardware-related issues

10h10 - 10h30: CCID-35: CCD for curvature wavefront sensing ( Dorn / ESO )

10h30 - 10h50: Fly-Eyes ( Cuillandre / CFHT )

10h50-11h10 coffe break

11h10 - 11h30: RTC issues ( Fedrigo-Hubin / ESO )

11h30 - 11h50: Deformable Mirrors ( Jagourel / CILAS )

11h50 - 12h10: Options for the Lenslet array ( Arsenault-Hubin / ESO )

V- Calibration and deconvolution issues

12h10 - 12h40: Calibrations / deconvolution ( Fusco / Onera )

12h00 - 14h00: Lunch break

VI- Other AO System projects:

14h00 - 14h20: NAOS + ESO/Planet Finder ( Mouillet / OMP Tarbes )

14h20 - 14h40: Hokupa'a 85 / projects at IfA ( Ftaclas / IfA )

14h40 - 15h00: Adaptive Optics for the German Solar Telescope
( Berkefeld / Freiburg )


15h00 - ~16h00:

Is PUEO NUI timely? How does it fit in the long term plans?
Who builds it? Where?


10min: possible contribution from HIA (Veran)
10min: possible contribution from LAOG (Kern / Perrier?)
10min: possible contribution from CFHT (Veillet?)

Organising committee as moderators / animators

16h00 - 16h30: concluding remarks

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Participants (as of May 9th)

Bastien, Pierre        U Montreal 
Berger, Jean-Philippe LAOG
Berkefeld, Thomas Uni Freiburg
Beuzit, Jean-Luc Grenoble
Bohlender, David HIA
Bouvier, Jerome LAOG

Carignan, Claude Univ. de Montreal
Cuillandre, Jean-Charles CFHT

Dorn, Reihold ESO
Dougados, Catherine Grenoble
Doyon, Rene U Montreal
Duchene, Gaspard UCLA
Dumas, Christophe JPL

Ferrari, Marc OAMP / Marseilles
Foy, Renaud Obs. de Lyon
Ftaclas, Christ IfA
Fusco, Thierry ONERA

Gay, Jean Nice

Hirtzig, Mathieu LESIA

Jagourel, Pascal CILAS

Kern, Pierre LAOG
Kim, Oh-il Korea

Lai, Olivier CFHT
Liu, Michael IfA

Maillard, Jean-Pierre IAP
Martin, Eduardo IfA
Menard, Francois Grenoble
Monin, Jean-Louis LAOG
Mouillet, David OMP-Tarbes
Moutou, Claire Obs de Marseilles

Perrin, Guy LESIA / Paris
Perraut, Karine LAOG
Petitjean, Patrick IAP (22 seulement)
Puget, Pascal CFHT

Rayner, John T. IfA/IRTF
Rivet, Jean-Pierre Obs Nice
Rouan, Daniel Meudon

Saisse, Michel LAS /Marseille
Soltau, Dirk Freiburg
Soucail, Genevieve OMP/ Toulouse
Soummer, Remi Nice

Veillet, Christian CFHT

Woillez, Julien Meudon

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To get to LAOG in Grenoble

Please see this site , which has an interactive map of the campus . If you need information on how to get to the campus, you will also find maps of Grenoble, of the town center and various addresses on the LAOG web site

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Proposed Hotels in Grenoble

HOTEL list --  Grenoble down town

HOTEL DE L'EUROPE (2 stars **)
22 pl. Grenette


Located hyper-center within the pedestrian zone
1 minute walk from tramway line to University

45,6 Euros simple occupancy
60,2 Euros double occupancy (2 regular beds)

Includes private shower, WC, TV

Breakfast available for 5,50Euros/pers extra

26 av Alsace Lorraine


Located 3min from the train station
3 min from tramway line to University

42,2 Euros single occupancy shower-WC-TV
47,8 EUros double occupancy (twin beds)

Breakfast for 5,20 Euros/pers. extra

12, rue Aristide Berges

100m away from train station
Very close to tramway line to University

40,6 Euros single occupancy
46,20 Euros double occupancy (1 small beds)

All with WC and showers

Breakfast available, 5,50/pers. extra

HOTEL IBIS CENTRE (**) Full most of the time!!!
5, rue de Miribel

Hyper center
2 minutes away from tramway line to University

Many rooms available, shower + WC + TV

55 Euros, flat rate single or double oocupancy

Breakfast available for 5.50 Euros/pers. extra

45 ave. Felix Viallet

5 minutes away from train station
3 minutes from tramway line to University
500m outside of the pedestrian zone

43,6 Euros simple occupancy, shower-WC-TV
51,0 Euros double occupancy (twin beds) shower-WC-TV

Breakfast available for 6,0 Euros/pers. extra

25 av. Felix Viallet

5 minutes away from train station
3 minutes from tramway line to University
500m outside of the pedestrian zone

Rooms with 1 large bed

43,6 Euros single occupancy shower, WC, TV
52,2 Euros for double occupancy, (twin beds)

Breakfast available for 6,0 Euros/pers. extra


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