instrumentation/ oid / l. pasquini/ 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)

INSTRUMENTATION/ L. Pasquini/ 2 ____________________________________________________________

FLAMES

Basic FLAMES CharacteristicsBasic FLAMES Characteristics

• FOV 25 arcminutes diameter

• Positioning fibres on one plate while observing with the other plate

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

• 132 Objects GIRAFFE Medusa 1.2 arcseconds, R=15000 and R=7000

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

• 1 GIRAFFE ARGUS, Integral Field 7x11’’ (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 ____________________________________________________________

FLAMES

POSITIONER

• 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 FIBRES

• 8 UVES fibres/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

Medusa fibre efficiency (600nm)(Spec. > 47 %)

0

10

20

30

40

50

60

70

80

1 2 3 4 5 6 7 8 9

Fibre number

Tota

l effi

cien

cy (%

)

Bundle 1

Bundle 2

Bundle 3


FLAMES

GIRAFFE 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


FLAMES

Link to UVES RED ARM 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


FLAMES

FLAMES OBSERVING MODES 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)


FLAMES

CALIBRATIONS 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.


FLAMES

LIMITATIONS and WARNINGS 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 STC 53, April 24-25,2002

FLAMES

Installation and commissioning beginning of October 2001

Nasmyth illumination system January 2002

L. Pasquini April 2002

CORRECTOR


FLAMES

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

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


FIBRE SYSTEM


FLAMES

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.


OZ POZ INTEGRATION COMM 1


FLAMES

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


FIRST LIGHT UVES FIBRES March 31


FLAMES

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


GIRAFFE PAE March 2002


FLAMES


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


FLAMES

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 …...

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


STATUS and DEVELOPMENT

instrumentation/ oid / l. pasquini/ 1 ____________________________________________________________...

Documents

sampling r

medusa fibre efficiency

simultaneous wlc fibre

giraffe argus

flames coordination

fibre numbertotal efficiency

uves esomeudon

objects giraffe ifu