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

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

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

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  1. 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)

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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)

  9. 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.

  10. 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

  11. VLT INSTRUMENTATION STC 53, April 24-25,2002 FLAMES CORRECTOR Installation and commissioning beginning of October 2001 Nasmyth illumination system January 2002 L. Pasquini April 2002

  12. VLT INSTRUMENTATION 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

  13. VLT INSTRUMENTATION 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

  14. VLT INSTRUMENTATION 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

  15. VLT INSTRUMENTATION 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

  16. VLT INSTRUMENTATION STC 53, April 24-25,2002 FLAMES GIRAFFE FIRST LIGHT JULY 2, MEDUSA, 60 fibres, 543.1 nm, R=6000 L. Pasquini April 2002

  17. VLT INSTRUMENTATION 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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