6.5  m telescope for multi-object spectroscopy over a 3° field of view

Eads, Ryker W.; Angel, Roger

doi:10.1364/ao.393365

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…For instance, the Cosmological Evolution Survey (COSMOS) [5,6] using the Hubble Space Telescope (HST) and many ground-based facilities have revolutionized the eld of galaxy evolution even though it covers only 2 square degrees of the sky. Meanwhile, spectroscopic survey telescopes with large FOV and multiplex capability also contribute signi cantly to the studies of dark energy & dark matter, stellar physics, gravitational wave cosmology, the structure and evolution of our Milky Way, and many other areas [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Conceptual Design of the Optical System of the 6.5m Wide Field MUltiplexed Survey Telescope with Excellent Image Quality

Zhang

Jiang

Shectman

et al. 2022

Preprint

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Astrophysics and cosmology in the coming decades urgently need a large field-of-view (FOV), highly multiplexed spectroscopic survey telescope satisfying challenging image quality and stability requirements. The 6.5m MUltiplexed Survey Telescope (MUST) proposed by Tsinghua University will be constructed on the Saishiteng Mountain of Northwest China to improve the spectroscopic survey capability of ground-based optical telescopes. In this paper, we demonstrate the conceptual design of the optical system of MUST. MUST will adopt a 6.5m primary mirror, a 2.45m secondary mirror, and a multiple-element widefield corrector (WFC) to ensure excellent image quality with an 80% encircled energy size of image spots less than ~ 0.6 arcsec in diameter for the entire 3° FOV and the whole 50° zenith angle range. Thanks to its compact 6.5m Ritchey-Chretien system and 20000 optical fibers on its Cassegrain focus, MUST will carry out state-of-the-art wide-field spectroscopic surveys with efficiency ~ 19 times higher than the Dark Energy Spectroscopic Instrument (DESI) using a measure proposed by Ellis et al. Upon completion around 2029, MUST will be one of the world's largest and most advanced wide-field spectroscopic survey telescopes and a new essential reference for the future development of wide-field survey telescopes. It will enable significant advances in many fields in astrophysics and cosmology.

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Section: Introductionmentioning

confidence: 99%

Conceptual Design of the Optical System of the 6.5m Wide Field MUltiplexed Survey Telescope with Excellent Image Quality

Zhang

Jiang

Shectman

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Spectroscopic follow-up will use the 3.8-m Mayall telescope now equipped with the DESI multi-object spectrograph, which obtains simultaneously spectra of 5000 objects chosen from a 3.2° field of view [8]. Larger telescopes for multi-object spectroscopy are being designed, for example, 6.5-m and 20 m telescopes with 3° field to accommodate 10 000 positionable 1.2 arcsec fibres [9].…”

Section: Introductionmentioning

confidence: 99%

A 20 m wide-field diffraction-limited telescope

Eads

Angel

2020

Phil. Trans. R. Soc. A.

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A 20 m space telescope is described with an unvignetted 1° field of view—a hundred times larger in area than fields of existing space telescopes. Its diffraction-limited images are a hundred times sharper than from wide-field ground-based telescopes and extend over much if not all the field, 40 arcmin diameter at 500 nm wavelength, for example. The optical system yielding a 1°, 1.36 m diameter image at f/3.9 has relatively small central obscuration, 9% by area on axis, and is fully baffled. Several carousel-mounted instruments can each access directly the full image. The initial instrument complement includes a 400 gigapixel silicon imager with 2 µm pixels (0.005 arcsec), and a 60 gigapixel HgCdTe imager with 5 µm pixels (0.012 arcsec). A multi-object spectrograph with 10 000 fibres will allow spectroscopy with 0.02 arcsec resolution. Direct imaging and spectroscopy of exoplanets can take advantage of the un-aberrated, on-axis image (5 nm RMS wavefront error). While this telescope could be built for operation in free space, a site accessible to a human outpost at the Moon's south pole would be advantageous, for assembly and repairs. The lunar site would allow also for the installation of new instruments to keep up with evolving scientific priorities and advancing technology. Cooling to less than 100E K would be achieved with a surrounding cylindrical thermal shield. This article is part of a discussion meeting issue ‘Astronomy from the Moon: the next decades’.

show abstract

Conceptual design of the optical system of the 6.5m wide field multiplexed survey telescope with excellent image quality

et al. 2023

View full text Add to dashboard Cite

Astrophysics and cosmology in the coming decades urgently need a large field-of-view (FOV), highly multiplexed spectroscopic survey telescope satisfying challenging image quality and stability requirements. The 6.5 m MUltiplexed Survey Telescope (MUST) proposed by Tsinghua University will be constructed on the Saishiteng Mountain of Northwest China to improve the spectroscopic survey capability of ground-based optical telescopes. In this paper, we demonstrate the conceptual design of the optical system of MUST. MUST will adopt a 6.5 m primary mirror, a 2.45 m secondary mirror, and a multiple-element widefield corrector (WFC) to ensure excellent image quality with an 80% encircled energy size of image spots less than ~ 0.6 arcsec in diameter for the entire 3° FOV and the whole 50° zenith angle range. Thanks to its compact 6.5 m Ritchey-Chretien system and 20,000 optical fibers on its Cassegrain focus, MUST will carry out state-of-the-art wide-field spectroscopic surveys with efficiency ~ 19 times higher than the Dark Energy Spectroscopic Instrument (DESI) using a measure proposed by Ellis et al. Upon completion around 2029, MUST will be one of the world's most advanced wide-field spectroscopic survey telescopes and a new essential reference for the future development of wide-field survey telescopes. It will enable significant advances in many fields in astrophysics and cosmology.

show abstract

6.5 m telescope for multi-object spectroscopy over a 3° field of view

Cited by 6 publications

References 11 publications

Conceptual Design of the Optical System of the 6.5m Wide Field MUltiplexed Survey Telescope with Excellent Image Quality

Conceptual Design of the Optical System of the 6.5m Wide Field MUltiplexed Survey Telescope with Excellent Image Quality

A 20 m wide-field diffraction-limited telescope

Conceptual design of the optical system of the 6.5m wide field multiplexed survey telescope with excellent image quality

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