Science with Giant Telescopes - Jun 15-18, 2008 1

Instrument ConceptsInstrument Function range

(microns)Resolution FOV

GMACS Optical Multi-ObjectSpectrometer

0.35-1.0 250-4000 36-144arcmin^2

NIRMOS Near-IR Multi-ObjectSpectrometer

1.0-2.5 Up to ~4000 49arcmin^2

QSpec Optical High ResolutionSpectrometer

0.3-1.05 30K1” slit

3” + fibre mode

SHARPS(G-CLEF)

Optical High Resolution(Doppler) Spectrometer

0.4-0.7 150K 7 x 1” fibers

GMTNIRS Near-IR High-ResolutionSpectrometer

1.2- 5.0 25K-100K Single object

MIISE Mid-IR ImagingSpectrometer

3.0-25.0 1500 30”

HRCam Near-IR AO Imager 0.9-5.0 5-5000 30”

GMTIFS NIR AO-fed IFU 0.9-2.5 3000-5000 3”

Science with Giant Telescopes - Jun 15-18, 2008 2

GMT instrument conceptual design studies – 2005Internal to GMT consortium (at that time)GMT conceptual design review – February 2006Subsequent work by project, with partner participation:

Integration of seeing-limited instrumentsReconfiguration of instrument platformAO relay

Meetings: Seeing-limited instruments workshopAdaptive optics workshop Planet RV workshopScience with GMT (Canberra) – March 2008

Before proceeding, need to resolve instrument-AO interface

History

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GMT Instrument Design Studies • Request letters of intent (e.g. Sep 2008)

• Select list for design studies (~ 6?) (Nov 2008)

• Request for proposals released

for each instrument (Jan 2009)

• Proposals due (Mar 2009)

• Award contracts for design studies (May 2009)

• Negotiate study contracts,

contract start (Jul 2009)

• Finish design studies and review (Dec 2010)

• Select first light instruments,

start instrument development (2011)

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Some Issues

Intention of design studies is to form actual instrument teams– across (and beyond) partner institutions

Design study funding: project $ in-kind(probably not telescope time – too sensitive)

Evaluation:Internal – hard to avoid some conflictsExternal

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GMACS• Resolving power w/ 0.7 arcsec slit:

R ~ 1400 in blueR ~ 2700 in red (for accurate sky subtraction)cross-over at 6500 Å

• Separate 8 x 9 arcmin imaging channel

• Multi-object, multi-slit spectrograph• 4x spectrographs, each with red and blue arms, VPH gratings• Field of view: 8 x 18 arcmin• Wavelength range 0.36 – 1.02 μm• Collimated beam diameter: 300 mm

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GMACS – Optical Layout x4

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NIRMOS

• Wavelength range: 0.85 – 2.5 μm• Imaging Mode:

• 7 x 7 arcmin field of view• 0.067 arcsec/pixel• 6kx6k detector

• Spectroscopy Mode:• Multi-slits: 140 x 3 arcsec long, full wavelength coverage• 5 x 7 arcmin field of view• R ~ 3000 with 0.5 arcsec slits

• Augmented by GLAO

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GMACS, NIRMOS & MIISE

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QSpec• Four beam instrument• 450 mm beam diameter• R4 echelle gratings (x2): 200 x 1600 mm• Rφ = 30,000 arcsecs• λλ = 300 nm to 1.07 µm (in four channels)• 2-pix resolution: R=125,000• Pupil anamorphism• White pupil design• VPH grating cross-dispersion• Four catadioptric cameras• 4k x 6.5k to 6k x 8k CCDs (15 µm pixels)

UV: 299 to 389 nm

Blue: 383 to 545 nm

NIR: 723 to 1072 nm

Red: 536 to 734 nm

1 m

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SHARPS• Planet Doppler spectroscopy• Fiber-fed: 7x(obj,sky,cal) x 1.0” • Resolving power ~ 150,000• Wavelength: > 4400 – 6700 Å• White pupil spectrograph design

• CCD mosaic detector• Deep depletion CCDs for red orders• Vacuum-enclosed spectrograph• High-stability thermal environment• Bulky enclosure

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MIISE – Mid-IR Imaging Spectrometer

input fromAO feed

3-5 μm detector8-25 μm detector

2 micronphase sensorlong wavelength

imaging channel

nulling channel

dichroic

• Wavelength range: 3 - 25 μm• Field of view: 30 – 40 arcsec• Resolving power: R ~ 1500• Modes:

• Imaging• Spectroscopy• Nulling (8-25 μm)• Coronography (3-5 μm)

• Short wavelength channel: 3-5μ, 0.010 arcsec/pixel• Long wavelength channel: 8-25μ, 0.030 arcsec/pixel

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GMTIFS – GMT Integral Field Spectrograph• Single-object, AO-corrected, integral-field spectroscopy• Wavelength range: 1.0 – 2.5 μm• Resolving power: 4000 – 5000• Range of spatial sampling and fields of view:

• Galaxy dynamics: 0.05-0.10 arcsec sampling, 2-3 arcsec FOV• Black hole masses: Diffraction-limited sampling, small FOV

Spaxel size along slit (arcsec) 0.008 0.016 0.032 0.054

Slitlet width (arcsec) 0.020 0.040 0.080 0.135

Field of view (arcsec) 0.80 1.6 3.2 5.4

collimatorfold

grating

slicer

camera

detector

F-converterTel focus