The Large Fiber Array Spectroscopic Telescope: opto-mechanical design and architecture

Andrew J. Young; Roger Angel; Chad Bender; Joel Berkson; Peter Gray; Samuel Halverson; Hyukmo Kang; Daewook Kim; Andy Monson; Chang-Jin Oh; Matthew Rademacher; Christian Schwab; Dennis Zaritsky

doi:10.1117/12.2629330

The Large Fiber Array Spectroscopic Telescope: opto-mechanical design and architecture

Andrew J. Young^*, Roger Angel, Chad Bender, Joel Berkson, Peter Gray, Samuel Halverson, Hyukmo Kang, Daewook Kim, Andy Monson, Chang-Jin Oh, Matthew Rademacher, Christian Schwab, Dennis Zaritsky

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

2 Citations (Scopus)

Abstract

This paper describes the preliminary mechanical design and optomechanics of LFAST, the Large Fiber Array Spectroscopic Telescope. The 1,200 m2 array comprises 132, open air, alt-az tracking mounts, each carrying 20 small coaligned telescopes in a 5 m square U-shaped space frame about a central, dual-axis worm drive. Each unit telescope has a 0.76 m, f/3.5 mirror, a prime focus assembly with field corrector and a guide camera, and feeds a 17um, 1.3 arcsecond optical fiber. LFAST was designed specifically as a fiber fed spectroscopic telescope. By being built from thousands of mass-produced components it will be much cheaper per square meter of collecting area than phased monolithic telescopes currently under construction, like GMT and ELT. Cost effective dome-less operation is made possible by the structural design that maximizes stiffness and active compensation for wind induced jitter. The primary mirrors are protected when not in use by sub-horizon pointing of tracking mount and mirror covers.

Original language	English
Title of host publication	Ground-based and Airborne Telescopes IX
Editors	Heather K. Marshall, Jason Spyromilio, Tomonori Usuda
Place of Publication	Washington, DC
Publisher	SPIE
Pages	1-13
Number of pages	13
ISBN (Electronic)	9781510653467
ISBN (Print)	9781510653450
DOIs	https://doi.org/10.1117/12.2629330
Publication status	Published - 2022
Event	Ground-based and Airborne Telescopes IX 2022 - Montreal, United States Duration: 17 Jul 2022 → 22 Jul 2022

Publication series

Name	Proceedings of SPIE
Publisher	SPIE
Volume	12182
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Ground-based and Airborne Telescopes IX 2022
Country/Territory	United States
City	Montreal
Period	17/07/22 → 22/07/22

Keywords

LFAST
Optomechanical Design
Array Telescope
Passive Support
Whiffle Tree

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10.1117/12.2629330

Cite this

Young, A. J., Angel, R., Bender, C., Berkson, J., Gray, P., Halverson, S., Kang, H., Kim, D., Monson, A., Oh, C.-J., Rademacher, M., Schwab, C., & Zaritsky, D. (2022). The Large Fiber Array Spectroscopic Telescope: opto-mechanical design and architecture. In H. K. Marshall, J. Spyromilio, & T. Usuda (Eds.), Ground-based and Airborne Telescopes IX (pp. 1-13). Article 121824B (Proceedings of SPIE; Vol. 12182). SPIE. https://doi.org/10.1117/12.2629330

@inproceedings{6d2ee61ec7a74673a4bfa0e85cc67132,

title = "The Large Fiber Array Spectroscopic Telescope: opto-mechanical design and architecture",

abstract = "This paper describes the preliminary mechanical design and optomechanics of LFAST, the Large Fiber Array Spectroscopic Telescope. The 1,200 m2 array comprises 132, open air, alt-az tracking mounts, each carrying 20 small coaligned telescopes in a 5 m square U-shaped space frame about a central, dual-axis worm drive. Each unit telescope has a 0.76 m, f/3.5 mirror, a prime focus assembly with field corrector and a guide camera, and feeds a 17um, 1.3 arcsecond optical fiber. LFAST was designed specifically as a fiber fed spectroscopic telescope. By being built from thousands of mass-produced components it will be much cheaper per square meter of collecting area than phased monolithic telescopes currently under construction, like GMT and ELT. Cost effective dome-less operation is made possible by the structural design that maximizes stiffness and active compensation for wind induced jitter. The primary mirrors are protected when not in use by sub-horizon pointing of tracking mount and mirror covers. ",

keywords = "LFAST, Optomechanical Design, Array Telescope, Passive Support, Whiffle Tree",

author = "Young, {Andrew J.} and Roger Angel and Chad Bender and Joel Berkson and Peter Gray and Samuel Halverson and Hyukmo Kang and Daewook Kim and Andy Monson and Chang-Jin Oh and Matthew Rademacher and Christian Schwab and Dennis Zaritsky",

year = "2022",

doi = "10.1117/12.2629330",

language = "English",

isbn = "9781510653450",

series = "Proceedings of SPIE",

publisher = "SPIE",

pages = "1--13",

editor = "Marshall, {Heather K.} and Jason Spyromilio and Tomonori Usuda",

booktitle = "Ground-based and Airborne Telescopes IX",

address = "United States",

note = "Ground-based and Airborne Telescopes IX 2022 ; Conference date: 17-07-2022 Through 22-07-2022",

}

Young, AJ, Angel, R, Bender, C, Berkson, J, Gray, P, Halverson, S, Kang, H, Kim, D, Monson, A, Oh, C-J, Rademacher, M, Schwab, C & Zaritsky, D 2022, The Large Fiber Array Spectroscopic Telescope: opto-mechanical design and architecture. in HK Marshall, J Spyromilio & T Usuda (eds), Ground-based and Airborne Telescopes IX., 121824B, Proceedings of SPIE, vol. 12182, SPIE, Washington, DC, pp. 1-13, Ground-based and Airborne Telescopes IX 2022, Montreal, United States, 17/07/22. https://doi.org/10.1117/12.2629330

The Large Fiber Array Spectroscopic Telescope: opto-mechanical design and architecture. / Young, Andrew J.; Angel, Roger; Bender, Chad et al.
Ground-based and Airborne Telescopes IX. ed. / Heather K. Marshall; Jason Spyromilio; Tomonori Usuda. Washington, DC: SPIE, 2022. p. 1-13 121824B (Proceedings of SPIE; Vol. 12182).

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

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AU - Halverson, Samuel

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N2 - This paper describes the preliminary mechanical design and optomechanics of LFAST, the Large Fiber Array Spectroscopic Telescope. The 1,200 m2 array comprises 132, open air, alt-az tracking mounts, each carrying 20 small coaligned telescopes in a 5 m square U-shaped space frame about a central, dual-axis worm drive. Each unit telescope has a 0.76 m, f/3.5 mirror, a prime focus assembly with field corrector and a guide camera, and feeds a 17um, 1.3 arcsecond optical fiber. LFAST was designed specifically as a fiber fed spectroscopic telescope. By being built from thousands of mass-produced components it will be much cheaper per square meter of collecting area than phased monolithic telescopes currently under construction, like GMT and ELT. Cost effective dome-less operation is made possible by the structural design that maximizes stiffness and active compensation for wind induced jitter. The primary mirrors are protected when not in use by sub-horizon pointing of tracking mount and mirror covers.

AB - This paper describes the preliminary mechanical design and optomechanics of LFAST, the Large Fiber Array Spectroscopic Telescope. The 1,200 m2 array comprises 132, open air, alt-az tracking mounts, each carrying 20 small coaligned telescopes in a 5 m square U-shaped space frame about a central, dual-axis worm drive. Each unit telescope has a 0.76 m, f/3.5 mirror, a prime focus assembly with field corrector and a guide camera, and feeds a 17um, 1.3 arcsecond optical fiber. LFAST was designed specifically as a fiber fed spectroscopic telescope. By being built from thousands of mass-produced components it will be much cheaper per square meter of collecting area than phased monolithic telescopes currently under construction, like GMT and ELT. Cost effective dome-less operation is made possible by the structural design that maximizes stiffness and active compensation for wind induced jitter. The primary mirrors are protected when not in use by sub-horizon pointing of tracking mount and mirror covers.

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CY - Washington, DC

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ER -

The Large Fiber Array Spectroscopic Telescope: opto-mechanical design and architecture

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