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INSTRUMENTATION/ OID / L. Pasquini/ 1 ____________________________________________________________ FLAMES. COORDINATION AND INTERFACES. FIELD CORRECTOR. CALIBRATION UNIT (ESO) FIBRE POSITIONER (AAO and Mt. Stromlo)

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INSTRUMENTATION/ OID / L. Pasquini/ 1____________________________________________________________

FLAMES

  • COORDINATION AND INTERFACES. FIELD CORRECTOR. CALIBRATION UNIT(ESO)

  • FIBRE POSITIONER(AAO and Mt. Stromlo)

  • GIRAFFE: Fibres, Spectrograph Mechanics (Meudon) , Optics, Gratings, Control Electronics & SW, Detector, Integration, Testing (ESO)

  • DATA REDUCTION & ANALYSIS(Geneve-Lausanne)

  • FIBRE LINK TO UVES(ESO-Meudon-ITALConsortium)

  • SUPER-OS and OPERATIONS (ESO, ITAL Consortium)


INSTRUMENTATION/ L. Pasquini/ 2____________________________________________________________

FLAMES

Basic FLAMES Characteristics

  • FOV25 arcminutes diameter

  • Positioning fibres on one plate while observing with the otherplate

  • 8 objects to UVES - Red arm, R=45000, 1 simultaneous WLC Fibre for accurate RV

  • 132 Objects GIRAFFE Medusa1.2 arcseconds, R=15000 and R=7000

  • 15 Objects GIRAFFE IFU 2.5x3.5’’, R=22000 and R=9000

  • 1 GIRAFFE ARGUS, Integral Field7x11’’ (0.5’’ sampling; 4.2x6.6’’ with 0.3’’ sampling) R=22000 and R=9000

  • Possibility of simultaneous GIRAFFE and UVES observations

  • Provision for additional spectrograph


INSTRUMENTATION/L.Pasquini/3 ____________________________________________________________FLAMESPOSITIONER

  • Efficient Operations (positioning while obs., <10 sec/fibre, <5 min plate exch.)

  • Positioning accuracy (< 0.15 arcsec), and stability (< 0.05 arcsec/2 hours)

  • 4 FACBs (3X3 arcsec imaging bundles) for centering and secondary guiding

  • Small distance between buttons (<10 arcsec); 11 arcsec due to button size

  • Low fibre stress, bending, twisting (Fibre photometric stability)

  • Calibration unit for FF and Th-A (2 min/setup, accurate FF flux calibration)

  • Argus: 2 scales and ADC


INSTRUMENTATION/ L. Pasquini___________________________________________________________

FLAMES

CORRECTOR

  • OPTICS: BK7 Doublet

  • Transmission: Better than 85% in the 370-900 nm range (single layer MgF2 coating)

  • FoV: 25 arcminutes

  • Optical Quality: Better than 0.25 arcseconds (100% energy) over the whole FoV

  • Nasmyth Calibration Unit: To be used with Nasmyth Screen for additional calibrations (FF and fibre transmission)

  • Exit pupil: concentric to the field curvature

  • End of September 2001 commissioning at Paranal


INSTRUMENTATION/ L. Pasquini____________________________________________________________

FLAMES

FIBRES

  • 8 UVESfibres/plate; 1 arcsec, (+ 1 fibre for simultaneous calibration)

  • 132 MEDUSA (1.2 arcsec)/plate

  • 15 IFUs (+ 15 IFU sky)/plate (2x3 arcsec, 0.52” sampling)

  • 1 ARGUS (1 plate) +15Argus sky (7x11 arcsec with 0.52” sampling)

  • 5 Simultaneous Th-A spectra for EACH observation

  • Fibre photometric stability (< 2%)

  • Transmission exceeding specs


INSTRUMENTATION/ L. Pasquini____________________________________________________________

FLAMES

GIRAFFE

  • MEDUSA: separation 2.3 core (<0.3% contamination), sampling ~6 pixels

  • IFUs and ARGUS: separation 1.4 core (<20% contamination), sampling ~2.5 pixels

  • One 2x4K EEV detector (Bruce)

  • 18 cm beam, dioptric spectrograph

  • 2 gratings: (HR: 316 l/mm, 63.6 blaze; LR: 600 l/mm, 34 blaze)

  • Sorting Order Filters (Very Efficient)!

  • Stability: < 1 micron/hour

  • Repeatability: 0.3 pixels/day perpendicular to dispersion

  • Fixed setups (22 HR,8 LR) 370-950nm

  • Radial velocity specs: 1% resolution for V>17.5 G stars


INSTRUMENTATION/ L. Pasquini____________________________________________________________

FLAMES

Link to UVES RED ARM

  • HARDWARE modifications to UVES implemented.

  • 3 Standard UVES RED Setups (520, 580, 860 nm)

  • R ~ 45000

  • Separation: 1.7 arcsec; contamination < 5 %

  • 8 Objects (eventually 1 to sky, no default sky fibre)

  • 7 Objects + 1 Simultaneous calibration (Accurate radial velocities)

  • 6 Objects (Overlap between orders at the blue edge, below 480 nm)

  • Efficiency: 50-60% of the UVES RED standard mode


INSTRUMENTATION/ L. Pasquini____________________________________________________________

FLAMES

FLAMES OBSERVING MODES

  • MEDUSA (GIRMED)

  • IFU (GIRIFU)

  • ARGUS (GIRARG)

  • UVES (UVES)

  • UVES Simultaneous (UVES_SIM)

  • Combined UVES + MEDUSA (COMMED)

  • Combined UVES + IFU (COMIFU)

  • Combined UVES + Argus (COMARG)


INSTRUMENTATION/ L. Pasquini____________________________________________________________

FLAMES

CALIBRATIONS

  • Calibrations should be taken in day-time to maximize observations

  • STANDARD Calibrations with Positioner: Fibre-Fibre transmission < 2%, Pixel-Pixel variations < 0.5 % , taken in day-time.

  • STANDARD Calibrations will not need to be defined by users

  • For GIRAFFE: all spectra will have 5 fibres dedicated to simultaneous Th-A

  • If STANDARD calibrations not enough: “Attached” FF calibrations with Nasmyth screen illumination system, BUT night time

  • Very large number of possible set-ups (Giraffe: 30*5=150; UVES: 3*4=12) : limited number of setups/night, fixed configurations.


INSTRUMENTATION/ L. Pasquini____________________________________________________________

FLAMES

LIMITATIONS and WARNINGS

  • ASTROMETRY!

  • a) better than ~0.3 arcsec relative

  • b) VLT Guide star and Fiducial (FACBs) stars in the same astrometric system as targets

  • ATMOSPHERE! Differential refraction and dispersion (although positioner will position the fibre at the postion corresponding to middle of the exposure)

  • Calibrations: limited number (4-5) of setups / night

  • FIXED setups: (e.g. not tunable wavelength domain, no choice of CCD settings, no choice of echelle order, resolving power….)

  • Short exposures --> low duty cycles


VLT INSTRUMENTATION INSTRUMENTATION/ L. Pasquini STC 53, April 24-25,2002

FLAMES

CORRECTOR

Installation and commissioning beginning of October 2001

Nasmyth illumination system January 2002

L. Pasquini April 2002


VLT INSTRUMENTATION INSTRUMENTATION/ L. Pasquini STC 53, April 24-25,2002

FLAMES

FIBRE SYSTEM

All Fibres have been delivered to ESO and mounted on Oz Poz.

5 fibres (out of 1200) were damaged and were repaired.

L. Pasquini April 2002


VLT INSTRUMENTATION INSTRUMENTATION/ L. Pasquini STC 53, April 24-25,2002

FLAMES

OZ POZ INTEGRATION COMM 1

After PAA, Oz Poz integrated in Paranal and COMM1 took place end March 2002

Quite successful, accuracy plate geometry 0.001, problem with R encoder and friction due to

lower temperature at Paranal; will be fixed in June 2002.

L. Pasquini April 2002


VLT INSTRUMENTATION INSTRUMENTATION/ L. Pasquini STC 53, April 24-25,2002

FLAMES

FIRST LIGHT UVES FIBRES March 31

On March 31 acquisition first 7 spectra of giants in O Cen. Exposures

of 5, 10 and 10 minutes last made with FLAMES OS. R=47000

Operating whole night from Control Room. Reduced with DRS on the spot

L. Pasquini April 2002


VLT INSTRUMENTATION INSTRUMENTATION/ L. Pasquini STC 53, April 24-25,2002

FLAMES

GIRAFFE PAE March 2002

After first laboratory light on Dec 16, PAE was granted to Giraffe in March 2002

+ Very good resolving power and image quality, Resolution, Calibrations for all 30 setups

- Lower efficiency (Blue); H-R grating under spec, will be replaced as soon as possible

L. Pasquini April 2002


VLT INSTRUMENTATION INSTRUMENTATION/ L. Pasquini STC 53, April 24-25,2002

FLAMES

GIRAFFE FIRST LIGHT JULY 2, MEDUSA, 60 fibres, 543.1 nm, R=6000

L. Pasquini April 2002


VLT INSTRUMENTATION INSTRUMENTATION/ L. Pasquini STC 53, April 24-25,2002

FLAMES

STATUS and DEVELOPMENT

GIRAFFE re-integrated on platform and tested (2 weeks). No major problems

NEXT COMMISSIONING RUN (Oz Poz , Oz Poz + UVES, GIRAFFE) August 18 Sept. 3

Long Way to go…

Fix the Positioner Robot

Complete Fibre Mounting & HW

Fine Tuning Giraffe

Plate Geometry at 10-4

Functioning FACBs

Positioner Calibration Unit

Characterize UVES

Characterize Giraffe …...

L. Pasquini April 2002


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