Progress meeting 4, 27.01.2006

Calibration UnitCalibration Unitstatus at PM4 status at PM4

Andreas Kelz, Andreas Kelz, Svend M. BauerSvend M. Bauer

Uwe Laux, Uwe Laux, Martin M. RothMartin M. Roth

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CU product treeCU product tree

Calibration Unit (CU)

Calibration Light

Sources Calibration

Optics

Focal Plane

Simulator(s) (FPS)

Calibration Control System

Calibration Unit (CU)

Calibration Light

Sources Calibration

Optics

Focal Plane

Simulator(s) (FPS)

Calibration Control System

CONT & ARCLamps, filters & shutters

Integrating sphere & lens to mimic VLT pupil & beam

various calibration masks

PE + ICE (AIP + LAOMP)

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CU RequirementsCU Requirements

Functional and performance requirements: • Flat field calibration• Spectral calibration • Image quality calibration• Geometrical calibration• Light contamination

Operational requirements: • Natural imposed environment• Operating modes• Lifetime requirements• Reliability / Safety requirements• Maintenance / Interchangeability requirements

Interface requirements: • Mechanical and thermal interfaces• Electrical, communication and fluid interfaces• Optical interfaces• Software interfaces

for details see: ‚CU Technical Specifications‘ Version: 2.3 from: 26/04/2005 VLT-SPE-MUS-14670-0022

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VLT beam

CU beam

CU conceptCU concept

Calibration optics focal plane „virtual lens“ pupil plane

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CU basicsCU basics

– CU optics to replace and to simulate the VLT

– One calibration relay lens (CRL) to mimic VLT beam (using a telescope objective).

– An integrating sphere for homogenous illumination (to simulate flatfield screen).

– Various calibration light sources (CLS) for white light and spectral illumination.

- Precision masks at CU focal plane to calibrate instrument and to measure image quality.

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55 mm80 mm

1200 mm1108 mm

Top: VLT beamBottom: CU beam (D=80mm, F‘=1200mm)

Integrating Sphere (IS) = pupil plane

Calibration Relay Lens (CRL) CU Focal

Plane (CFP)

CU designCU design

(Apochromat triplet K5 / CaF2 / K5)

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546 nm 436 nm 707 nm 480 nm 644 nm pupil polychrom.

VLT – focal planeVLT – focal planespot diagrammsspot diagramms

on

-axis o

ff-a

xis ->

0.03mm

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546 nm 436 nm 707 nm 480 nm 644 nm pupil polychrom.

CRL – Apochromat CRL – Apochromat (CaF2)(CaF2)

spot diagrammsspot diagrammson

-axis o

ff-a

xis ->

0.15 mm

VLT Airy disk

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CU with mechanicsCU with mechanics

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CU dimensionsCU dimensions

1.3 m

1.6 m

ca. 80 kg

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CLS – IS - CRLCLS – IS - CRL

Lamps and Proximity Electronicin individual housings

Flexible Light Guides to connect lamps to CU

Integrating Sphere forhomogenous illumionation

Stray light baffles

Calibration optics to mimic telescope

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i.e. 6 lamps: • Continuum Flat:

Quartz halogen • Arc lamps (pencil style):

Hg, Ar, Ne, Kr Arc lamps (High Power):

He, K, Cs, Cd, Rb, Hg • Hollow cathode lamps:

Th/Ar Fe/Ar/He

Calibration Light Calibration Light Sources & PE boxesSources & PE boxes

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CMW-CPECMW-CPE

CU inner components: Calibration Mask Wheel and Pick-up Element

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Pinhole maskPinhole mask

MUSE pinhole mask: ~800 pinholes, 20 micron at 35x35 mmPrecison and pitch Tolerance: +/- 1 micron

Laser-manufactured (LMTB) mask: 1024 pinholes, 12 microns each at 1x1 mm

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B3110 Calibration Unit opto-mechanical design

– Location of CU on Nasmyth platform TBD

– Removability of CU for GALACSI dismounting – Location of lamps and distance from CU to electronic

cabinets

CU: TBD – open issuesCU: TBD – open issues

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– CU optical design document: due at 3.Feb. includes: Finalized CU optical design, updated cost estimate, possible manufactures, Obtain quotes for CRL (estimate: ~ 10-15 kEuro) Selection and location of lamps

– CU mechanical design document: due at 10. Feb. includes: Folded beam option, weights, proposed location options

– Optical designer meeting at AIP (9.3. proposed)

– Mechanical Designer meeting at IAG (31.3. proposed)

CU: foreseen workCU: foreseen work