GMT integral-field spectrograph (GMTIFS) conceptual design

McGregor, Peter; Bloxham, Gabe; Boz, Robert; Davies, J.; Doolan, Matthew; Ellis, Michael J.; Hart, John; Jones, D G; Luvaul, Lance; Nielsen, Jon; Parcell, Simon; Sharp, Robert; Stevanović, Dejan; Young, P.

doi:10.1117/12.925259

Cited by 31 publications

(11 citation statements)

References 3 publications

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“…• The Gre ima • The instr limi • The to t dire nary design of t concepts is pl ctrographs desi TIFS 4 and GM CLEF spectrog ill be located o veled in prepara lescope from t m away prov 8 . The GMT si ed parameter r ng section desc esents the preli m, and Section ing Modes will support thr roaches to bala orrector for all e Ground Laye gorian field of ge quality imp e Natural Guide rument to prov ited imaging at e Laser Tomog tomographicall ection of a cent the first genera anned in 201 igned specifica MTNIRS 5 ).…”

Section: Observimentioning

confidence: 99%

The Giant Magellan Telescope adaptive optics program

Bouchez¹,

Acton²,

Agapito

et al. 2014

SPIE Proceedings

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The Giant Magellan Telescope (GMT) adaptive optics (AO) system will be an integral part of the telescope, providing laser guidestar generation, wavefront sensing, and wavefront correction to every instrument currently planned on the 25.4 m diameter GMT. There will be three first generation AO observing modes: Natural Guidestar, Laser Tomography, and Ground Layer AO. All three will use a segmented adaptive secondary mirror to deliver a corrected beam directly to the instruments.The Natural Guidestar mode will provide extreme AO performance, with a total wavefront error less than 185 nm RMS using bright guidestars. The Laser Tomography mode uses 6 lasers and a single off-axis natural guidestar to deliver better than 290 nm RMS wavefront error at the science target, over 50% of the sky at the galactic pole. The Ground Layer mode uses 4 natural guidestars on the periphery of the science field to tomographically reconstruct and correct the ground layer AO turbulence, improving the image quality for wide-field instruments. A phasing system maintains the relative alignment of the primary and secondary segments using edge sensors and continuous feedback from an off-axis guidestar. We describe the AO system preliminary design, predicted performance, and the remaining technical challenges as we move towards the start of construction.

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Section: Observimentioning

confidence: 99%

The Giant Magellan Telescope adaptive optics program

Bouchez¹,

Acton²,

Agapito

et al. 2014

SPIE Proceedings

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show abstract

“…Due to the symmetrical structure of the rotor and cam assembly, the expression for opposing sensors differs only in the sign of the rotor runout term. Adding Eqns (1) and 3, and Eqns (2) and (4) eliminates x and y. Dividing the resulting expressions by two and rearranging gives the sin and cosine of the rotor angle in terms of the average gaps in the X and Y directions,…”

Section: Resolvermentioning

confidence: 99%

Testing a prototype rotary mechanism for GMTIFS

Price

Hart

O'Brien

et al. 2018

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

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The GMTIFS instrument requires multiple rotary mechanisms that will operate in a cryogenic environment. Angular precision up to one arc-second is required without the use of IR sources as part of an encoder. A general design that uses an annular conical rim bearing supported by three pairs of tapered pinch rollers has been proposed. One pair of pinch rollers is mounted on a flexure hinge to provide preload and accommodate thermal expansion. A pair of offset cylindrical cams carried by the rotor, and four capacitive distance sensors fixed to the stator are utilized to implement a resolver. This provides a measure of the rotor orientation that is insensitive to runout of the rotor. A prototype of this design was constructed and tested in the lab to investigate the effect of runout in the tapered rollers and assess the performance of the rim bearing and various resolver designs. We present the results of this testing.

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“…The design of the GMT Integral Field Spectrograph (GMTIFS) has not changed significantly since the previous conference 10 . Its heritage derives from the Gemini GSAOI 11 and NIFS 12 instruments built by the same instrument team.…”

Section: Gmtifsmentioning

confidence: 99%

Status of the instrumentation program for the Giant Magellan Telescope

et al. 2014

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Instrument development for the 25 m class optical/infrared Giant Magellan Telescope (GMT) is actively underway. Two instruments have begun their preliminary design phase: an optical (350-1000 nm) high resolution and precision radial velocity echelle spectrograph (G-CLEF), and a near-IR (YJHK) diffraction-limited imager/integral-field-spectrograph (GMTIFS). A third instrument will begin its design phase in early 2015: an optical (370-1000 nm) low-to-medium resolution multi-object spectrograph (GMACS). Two other instrument teams are focusing on prototypes to demonstrate final feasibility: a near-to-mid-IR (JHKLM) high resolution diffraction-limited echelle (GMTNIRS) spectrograph, and a facility robotic multi-fiber-feed (MANIFEST). A brief overview of the GMT instrumentation program is presented: current activities, progress, status, and schedule, as well as a summary of the facility infrastructure needed to support the instruments.

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GMT integral-field spectrograph (GMTIFS) conceptual design

Cited by 31 publications

References 3 publications

The Giant Magellan Telescope adaptive optics program

The Giant Magellan Telescope adaptive optics program

Testing a prototype rotary mechanism for GMTIFS

Status of the instrumentation program for the Giant Magellan Telescope

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