(novembre 10, nice)
DESCRIPTION
(Novembre 10, Nice). Science Case. Follow-up GAIA (1 milliard d’étoiles, positions et vitesses) : priority identified by: ESO/ESA working group on «The Galaxy» (Turon et al. 2008) Astronet Roadmap identifié lors de la prospective INSU 2009 Two cases identified: - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/1.jpg)
(Novembre 10, Nice)
![Page 2: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/2.jpg)
(Novembre 10, Nice)
Science Case
Follow-up GAIA (1 milliard d’étoiles, positions et vitesses) : priority identified by:• ESO/ESA working group on «The Galaxy» (Turon et al. 2008)
• Astronet Roadmap
• identifié lors de la prospective INSU 2009
Two cases identified:
- low-resoluion spectroscopy (R~5000) for stars V>17 (3rd dim of velocities)
- high-resolution spectroscopy (R~20000) for stars V>10 (detailed chemical abundances)
Rien en Europe avant GYES; maintenant 2 projets low-R
complémentaire: HERMES/AAO pour l’hemisphère sud
![Page 3: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/3.jpg)
(Novembre 10, Nice)
GYES science case
• Chemical labelling of galactic populations (équipe Gaia)• discs
• disc-bulge interactions
• halo
• Galactic dynamics
• Other sciences with the survey• paramètres fondamentaux des étoiles, physique stellaire
• ISM
• variable stars (N. Nardetto)
• Globular clusters (A. Recio-Blanco)
![Page 4: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/4.jpg)
(Novembre 10, Nice)
GYES Science Team (Phase A)
P. François (PS), E. Caffau (co-PS), F. Arenou, C. Babusiaux, C. Balkowski, O. Bienaymé, P. Bonifacio, D. Briot, R. Carlberg, B. Famaey, Y. Frémat, A. Gomez, M. Haywood, V. Hill, R. Kudritzki, R. Lallement, P. de Laverny, B. Lemasle, C. Martayan, R. Monier, D. Mourard, N. Nardetto, A. Recio-Blanco, N. Robichon, A. Robin, M. Rodrigues, F. Royer, C. Soubiran, C. Turon, K. Venn, Y. Viala
![Page 5: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/5.jpg)
(Novembre 10, Nice)
GYES project & timelinesPhase A (GEPI +Oxford) January - Sept 2010• Phase A study financed by CSA-A : Jan - Sep 2010• July 2010 - Mid-Term review (at SPIE San Diego)• 27-28 October 2010 Concept Design Review
Delta-Phase A November 2010 - March 2011
Phase B March 2011 - April 2013
PAE July 2015PAH & Comissioning July-Dec 2015FAH December 2015
Survey 2016-2020
![Page 6: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/6.jpg)
(Novembre 10, Nice)
GYES System Team (Phase A)
P. Bonifacio (PI)
P. François (PS), E. Caffau (co-PS),
F. Royer (IS),
J.-L. Dournaux (PM),S. Mignot (SE), M. Cohen, D. Horville (optics) , J.-M. Huet (Mechanics) , I. Guinouard (fibres), G. Fasola (detectors & electronics) , P. Laporte (thermal control), G. Dalton, I. Lewis (positioner)
![Page 7: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/7.jpg)
(Novembre 10, Nice)
![Page 8: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/8.jpg)
(Novembre 10, Nice)
![Page 9: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/9.jpg)
(Novembre 10, Nice)
![Page 10: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/10.jpg)
(Novembre 10, Nice)
Structure• Gantry extent 962x911mm
• Z-axis 1332mm behind last corrector lens
• Fibres exit through tumbler axis
• Field plates have small rotation (retractors rotate with the plate), independent of each other, to account for differential refraction and intrinsic field rotation
• Focal plane imager deployed between corrector and observing field plate
• Trade-off between footprint and height
![Page 11: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/11.jpg)
(Novembre 10, Nice)
Software simulations
Full simulation of geometry, button manufacturing tolerances.
Random target distribution
20 fibres reserved for sky allocation
![Page 12: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/12.jpg)
(Novembre 10, Nice)
Fibres etc.
• Ensure the link between the positioner and the spectrograph•500 mono-object fibres•80 µm core•40 m long•Compatible with exchange procedure
• Perform simultaneous wavelength calibration•20 fibres•80 µm core•short (within spectrograph)
• Close guiding control loop•5 to 10 7-fibre IFUs•33 µm core•short (within PFUE)
![Page 13: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/13.jpg)
(Novembre 10, Nice)
Bundle
• Collaboration with Polymicro (fibre) and SEDI (French company specialised in fibre cables) • Stiff structure to limit radius of curvature•FRD•breaking fibres
• Armoured cable•withstand instrument exchange
• Need for individual protection buffer not determined yet
![Page 14: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/14.jpg)
(Novembre 10, Nice)
Transmission (I)Depending on the length and wavelength: impact on the location of the spectrograph.
![Page 15: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/15.jpg)
(Novembre 10, Nice)
Transmission (II)
• Worst case for non-telecentricity (one button type) & alignment
• Goal for alignment and FRD
![Page 16: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/16.jpg)
(Novembre 10, Nice)
Spectrograph
• Bench and feet (with pneumatic dampers)
• Cover (on bench or on ground)
• Mechanical mounts & optics:– collimator (3): – dichroic (1)– VPH gratings (2 x2)– cameras (2 pre-integrated)
• Slit exchange mechanism
• Detectors (2 x2)
• Dewars (2)
![Page 17: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/17.jpg)
(Novembre 10, Nice)
Baseline and back-up design
• Backup design: single VPH disperser
→ Consolidate the backup design to eventually consider it as the new baseline design
• Baseline: double VPH disperser
![Page 18: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/18.jpg)
(Novembre 10, Nice)
Disperser (I)• Type : VPH grating (large size and gr. density)
• Backup design specification:
• Baseline specification:
![Page 19: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/19.jpg)
(Novembre 10, Nice)
Disperser (II)• Baseline transmission efficiency:
– Peak: 84%
– Edges: 5% - 15%
![Page 20: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/20.jpg)
(Novembre 10, Nice)
Disperser (III)• Backup design transmission efficiency:
– Peak: close to 100%
– Edges: 40% - 47%
![Page 21: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/21.jpg)
(Novembre 10, Nice)
Resolution
![Page 22: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/22.jpg)
(Novembre 10, Nice)
Transmission (II)
![Page 23: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/23.jpg)
(Novembre 10, Nice)
Transmission (III)• Estimates of SNR per pixel in 2h @ V=16• centre of slit
• only the photon noise
![Page 24: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/24.jpg)
(Novembre 10, Nice)
GYES Survey
• Survey Strategy : 262 nights over 5 years ~ 3 ×105 stars in the disc, halo, bulge & clusters • Survey Management Plan: (~30FTE over 5 yrs)
• Input catalog & observation preparation• Spectra analysis pipeline development• Spectra analysis• Output catalog production & distribution
![Page 25: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/25.jpg)
(Novembre 10, Nice)
![Page 26: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/26.jpg)
(Novembre 10, Nice)
GYES project & timelinesPhase A (GEPI +Oxford) January - Sept 2010Delta-Phase A November 2010 - March 2011• Consortium build-up: + GEPI+ OCA: ICS, AIT, Optics (corrector ? tbd), Survey
Data Analysis, Science Team (PS)+ LAB: ICE, Science Team+ Oxford: positionner (hard and software)• Consolidate Management plan (+ AIT plan, +++)• Science tradeoffs (impact of new baseline design)
Phase B March 2011 - April 2013PAE July 2015PAH & Comissioning July-Dec 2015FAH December 2015
Survey 2016-2020
![Page 27: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/27.jpg)
(Novembre 10, Nice)
GYES project & timelinesPhase A (GEPI +Oxford) January - Sept 2010
Delta-Phase A November 2010 - March 2011
Phase B March 2011 - April 2013• kickoff for Phase B march 2011• PDR May 2012• FDR April 2013
PAE July 2015PAH & Comissioning July-Dec 2015FAH December 2015
Survey 2016-2020
![Page 28: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/28.jpg)
(Novembre 10, Nice)
GYES System Team (Phase B)P. Bonifacio (PI) P. François (Co-PI)
V. Hill (PS)
F. Royer (IS)
P. Jagourel (PM) +OCAS. Mignot (SE)M. Cohen, D. Horville + OCA (optics) J.-M. Huet (Mechanics) I. Guinouard (fibres)G. Fasola (detectors & electronics) + LAB (ICE)P. Laporte (thermal control) G. Dalton, I. Lewis (positioner)
ICS: OCA (JM Clausse)AIT : OCA (F. Henault)
![Page 29: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/29.jpg)
(Novembre 10, Nice)
Contribution OCA
Actuel FIZEAU:ICS: 3.7 FTE
0.6 FTE en phase B; 3FTE en phase C
AIT: 4.4 FTE1 FTE en phase B; 2 personnes en phase C + salle grise
Optique (en discussion: correcteur de champ ?)FODR phasé avec PDR (ie mai 2012)
Actuel Cassiopée:Survey: ~4 FTE sur 5 ans
Spectral analysis (pipeline development & operations)
![Page 30: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/30.jpg)
(Novembre 10, Nice)
GYES project & timelinesPhase A (GEPI +Oxford) January - Sept 2010
Delta-Phase A November 2010 - March 2011
Recommandation SAC (nov 2011) - Board (dec 2011)
Phase B March 2011 - April 2013
PAE July 2015PAH & Comissioning July-Dec 2015FAH December 2015
Survey 2016-2020
![Page 31: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/31.jpg)
(Novembre 10, Nice)
![Page 32: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/32.jpg)
(Novembre 10, Nice)
Status of study• Report status of study
– 9-month study
– still work in progress
– HW cost 4.6 M€ (with contigencies)
– Consolidated cost 13.8M€
– Timeline: on sky Dec 2015
• Active developments– refinements of the baseline
– need to loop back to science requirements and tradeoffs
– need for input as regards options (impact on timescale)
– need for input from CFHT (eg. guiding, software)
→ active work on transmission: many improvements possible
active reaction to VPH issue
![Page 33: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/33.jpg)
(Novembre 10, Nice)
TypeOnly the fibres from Polymicro have been investigated (commonly used in astronomy).
![Page 34: (Novembre 10, Nice)](https://reader036.vdocuments.site/reader036/viewer/2022062520/56815a2a550346895dc76b2b/html5/thumbnails/34.jpg)
(Novembre 10, Nice)
For Phase B some noveltiesP. Bonifacio (PI) P. François (co-PI)
V. Hill (PS)
F. Royer (IS)
P. Jagourel (PM)
+ Participation of OCA (ICS + AIT)
LAB (ICE+ Detectors)
+ ????