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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


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 languageEnglish (US)
Title of host publicationGround-Based and Airborne Telescopes IX
EditorsHeather K. Marshall, Jason Spyromilio, Tomonori Usuda
ISBN (Electronic)9781510653450
StatePublished - 2022
EventGround-Based and Airborne Telescopes IX 2022 - Montreal, United States
Duration: Jul 17 2022Jul 22 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceGround-Based and Airborne Telescopes IX 2022
Country/TerritoryUnited States


  • Array Telescope
  • Optomechanical Design
  • Passive Support
  • Whiffle Tree

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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