Production of 8.4 m primary mirror segments for GMT

H. M. Martin; R. Ceragioli; V. Gasho; B. T. Jannuzi; D. W. Kim; J. S. Kingsley; K. Law; A. Loeff; R. D. Lutz; S. Meyen; C. J. Oh; M. T. Tuell; S. N. Weinberger; S. C. West; R. Whitsitt; R. Wortley

doi:10.1117/12.2630378

Production of 8.4 m primary mirror segments for GMT

H. M. Martin
, R. Ceragioli
, V. Gasho
, B. T. Jannuzi
, D. W. Kim
, J. S. Kingsley
, K. Law
, A. Loeff
, R. D. Lutz
, S. Meyen
, C. J. Oh
, M. T. Tuell
, S. N. Weinberger
, S. C. West
, R. Whitsitt
, R. Wortley

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

4 Scopus citations

Abstract

The Richard F. Caris Mirror Lab at the University of Arizona continues production of 8.4 m lightweight honeycomb segments for the primary mirror of the Giant Magellan Telescope. GMT's 25 m primary mirror consists of a center segment surrounded by six off-axis segments, with an additional off-axis segment to allow continuous operation as segments are removed for coating. We cast the sixth segment (5 off-axis segments + center segment) in March 2021. As of June 2022 we have tentatively completed polishing of the third off-axis segment, and we are in the process of grinding the optical surface of off-axis Segment 5. For Segment 3, we improved the measurement accuracy for small-scale structure near the edge of the mirror, which has been a challenge for the off-axis segments. In addition to full-aperture interferometry and deflectometry, we used a 20 cm test plate to obtain high-resolution interferometric measurements of the edge.

Original language	English (US)
Title of host publication	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V
Editors	Ramon Navarro, Roland Geyl
Publisher	SPIE
ISBN (Electronic)	9781510653573
DOIs	https://doi.org/10.1117/12.2630378
State	Published - 2022
Event	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V 2022 - Montreal, Canada Duration: Jul 17 2022 → Jul 22 2022

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	12188
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V 2022
Country/Territory	Canada
City	Montreal
Period	7/17/22 → 7/22/22

Keywords

Giant Magellan Telescope
aspheres
off-axis
optical fabrication
optical testing
telescopes

ASJC Scopus subject areas

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

Access to Document

10.1117/12.2630378

Cite this

Martin, H. M., Ceragioli, R., Gasho, V., Jannuzi, B. T., Kim, D. W., Kingsley, J. S., Law, K., Loeff, A., Lutz, R. D., Meyen, S., Oh, C. J., Tuell, M. T., Weinberger, S. N., West, S. C., Whitsitt, R., & Wortley, R. (2022). Production of 8.4 m primary mirror segments for GMT. In R. Navarro, & R. Geyl (Eds.), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V Article 121880J (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12188). SPIE. https://doi.org/10.1117/12.2630378

Production of 8.4 m primary mirror segments for GMT. / Martin, H. M.; Ceragioli, R.; Gasho, V. et al.
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V. ed. / Ramon Navarro; Roland Geyl. SPIE, 2022. 121880J (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12188).

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

Martin, HM, Ceragioli, R, Gasho, V, Jannuzi, BT , Kim, DW, Kingsley, JS, Law, K, Loeff, A, Lutz, RD, Meyen, S, Oh, CJ, Tuell, MT, Weinberger, SN, West, SC, Whitsitt, R & Wortley, R 2022, Production of 8.4 m primary mirror segments for GMT. in R Navarro & R Geyl (eds), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V., 121880J, Proceedings of SPIE - The International Society for Optical Engineering, vol. 12188, SPIE, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V 2022, Montreal, Canada, 7/17/22. https://doi.org/10.1117/12.2630378

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title = "Production of 8.4 m primary mirror segments for GMT",

abstract = "The Richard F. Caris Mirror Lab at the University of Arizona continues production of 8.4 m lightweight honeycomb segments for the primary mirror of the Giant Magellan Telescope. GMT's 25 m primary mirror consists of a center segment surrounded by six off-axis segments, with an additional off-axis segment to allow continuous operation as segments are removed for coating. We cast the sixth segment (5 off-axis segments + center segment) in March 2021. As of June 2022 we have tentatively completed polishing of the third off-axis segment, and we are in the process of grinding the optical surface of off-axis Segment 5. For Segment 3, we improved the measurement accuracy for small-scale structure near the edge of the mirror, which has been a challenge for the off-axis segments. In addition to full-aperture interferometry and deflectometry, we used a 20 cm test plate to obtain high-resolution interferometric measurements of the edge.",

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author = "Martin, \{H. M.\} and R. Ceragioli and V. Gasho and Jannuzi, \{B. T.\} and Kim, \{D. W.\} and Kingsley, \{J. S.\} and K. Law and A. Loeff and Lutz, \{R. D.\} and S. Meyen and Oh, \{C. J.\} and Tuell, \{M. T.\} and Weinberger, \{S. N.\} and West, \{S. C.\} and R. Whitsitt and R. Wortley",

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AU - Kim, D. W.

AU - Kingsley, J. S.

AU - Law, K.

AU - Loeff, A.

AU - Lutz, R. D.

AU - Meyen, S.

AU - Oh, C. J.

AU - Tuell, M. T.

AU - Weinberger, S. N.

AU - West, S. C.

AU - Whitsitt, R.

AU - Wortley, R.

PY - 2022

Y1 - 2022

N2 - The Richard F. Caris Mirror Lab at the University of Arizona continues production of 8.4 m lightweight honeycomb segments for the primary mirror of the Giant Magellan Telescope. GMT's 25 m primary mirror consists of a center segment surrounded by six off-axis segments, with an additional off-axis segment to allow continuous operation as segments are removed for coating. We cast the sixth segment (5 off-axis segments + center segment) in March 2021. As of June 2022 we have tentatively completed polishing of the third off-axis segment, and we are in the process of grinding the optical surface of off-axis Segment 5. For Segment 3, we improved the measurement accuracy for small-scale structure near the edge of the mirror, which has been a challenge for the off-axis segments. In addition to full-aperture interferometry and deflectometry, we used a 20 cm test plate to obtain high-resolution interferometric measurements of the edge.

AB - The Richard F. Caris Mirror Lab at the University of Arizona continues production of 8.4 m lightweight honeycomb segments for the primary mirror of the Giant Magellan Telescope. GMT's 25 m primary mirror consists of a center segment surrounded by six off-axis segments, with an additional off-axis segment to allow continuous operation as segments are removed for coating. We cast the sixth segment (5 off-axis segments + center segment) in March 2021. As of June 2022 we have tentatively completed polishing of the third off-axis segment, and we are in the process of grinding the optical surface of off-axis Segment 5. For Segment 3, we improved the measurement accuracy for small-scale structure near the edge of the mirror, which has been a challenge for the off-axis segments. In addition to full-aperture interferometry and deflectometry, we used a 20 cm test plate to obtain high-resolution interferometric measurements of the edge.

KW - Giant Magellan Telescope

KW - aspheres

KW - off-axis

KW - optical fabrication

KW - optical testing

KW - telescopes

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A2 - Navarro, Ramon

A2 - Geyl, Roland

PB - SPIE

T2 - Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V 2022

Y2 - 17 July 2022 through 22 July 2022

ER -

Production of 8.4 m primary mirror segments for GMT

Abstract

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Conference

Keywords

ASJC Scopus subject areas

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