AESOP, the 4MOST fibre positioner: engineering principles

Jurek Brzeski; Dave Adams; Gabriella Baker; Sufyan Baker; Rebecca Brown; Scott Case; Timothy Chin; Jack Coyne; Tony Farrell; James Gibson; Peter Gillingham; Ellen Houston; Urs Klauser; Yevgen Kripak; Nirmala Kunwar; Jon Lawrence; Slavko Mali; Wojtek Maslak; Helen McGregor; Rolf Muller; Vijay Nichani; Naveen Pai; Ellie O'brien; Robert Patterson; Will Saunders; Scott Smedley; Sudharshan Venkatesan; Minh Vuong; Lew Waller; Jahanzeb Zahoor; Jessica Zheng

doi:10.1117/12.2627903

AESOP, the 4MOST fibre positioner: engineering principles

Jurek Brzeski^*, Dave Adams, Gabriella Baker, Sufyan Baker, Rebecca Brown, Scott Case, Timothy Chin, Jack Coyne, Tony Farrell, James Gibson, Peter Gillingham, Ellen Houston, Urs Klauser, Yevgen Kripak, Nirmala Kunwar, Jon Lawrence, Slavko Mali, Wojtek Maslak, Helen McGregor, Rolf MullerVijay Nichani, Naveen Pai, Ellie O'brien, Robert Patterson, Will Saunders, Scott Smedley, Sudharshan Venkatesan, Minh Vuong, Lew Waller, Jahanzeb Zahoor, Jessica Zheng

^*Corresponding author for this work

Australian Astronomical Optics

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

6 Citations (Scopus)

Abstract

The Australian Astronomical Observatory's (AAO's) AESOP project is part of the Multi-Object Spectrograph Telescope (4MOST) system for the VISTA telescope. It includes the 2436-fibre positioner, space frame and electronics enclosures. The AESOP concept and the role of the AAO in the 4MOST project have been described in previous SPIE proceedings. The project final assembly stage has been completed. In this paper, engineering principles applied during assembly of critical components and testing of the instrument are discussed.

The major performance requirement for AESOP is that all 2436 science fiber cores and 12 guide fiber bundles are to be re-positioned to an accuracy of 10 micron within 1 minute. With a fast prime-focus focal-ratio, a close tolerance on the axial position of the fiber tips must be held so efficiency does not suffer from de-focus losses. Positioning accuracy is controlled with the metrology cameras installed on the telescope, which measures the positions of the fiber tips to an accuracy of a few micrometers and allows iterative positioning until all fiber tips are within tolerance on the focal surface plane. Maintaining co-planarity of the fiber tips requires accurate control in the assembly of several components that contribute to such errors.

AESOP requires a consistent production of high accuracy components and assemblies in a quantity of above 2500 items. To achieve this, we had to apply the highest engineering standards, including assembly procedures, metrology, and control systems. We designed many jigs and fixtures, which enabled us to produce high quality components and assemblies at reasonable cost. The results - working instrument was vastly achieved with the help of university students after providing a training in engineering practices.

Original language	English
Title of host publication	Ground-based and Airborne Instrumentation for Astronomy IX
Editors	Christopher J. Evans, Julia J. Bryant, Kentaro Motohara
Place of Publication	Washington, DC
Publisher	SPIE
Pages	1-15
Number of pages	15
ISBN (Electronic)	9781510653504
ISBN (Print)	9781510653498
DOIs	https://doi.org/10.1117/12.2627903
Publication status	Published - 2022
Event	Conference on Ground-based and Airborne Instrumentation for Astronomy IX - Montreal, Canada Duration: 17 Jul 2022 → 22 Jul 2022

Publication series

Name	Proceedings of SPIE
Publisher	SPIE
Volume	12184
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Conference on Ground-based and Airborne Instrumentation for Astronomy IX
Country/Territory	Canada
City	Montreal
Period	17/07/22 → 22/07/22

Keywords

Fiber positioner
piezoelectric actuators
jig
fixture
metrology
AESOP
VISTA
4MOST

Access to Document

10.1117/12.2627903

Cite this

Brzeski, J., Adams, D., Baker, G., Baker, S., Brown, R., Case, S., Chin, T., Coyne, J., Farrell, T., Gibson, J., Gillingham, P., Houston, E., Klauser, U., Kripak, Y., Kunwar, N., Lawrence, J., Mali, S., Maslak, W., McGregor, H., ... Zheng, J. (2022). AESOP, the 4MOST fibre positioner: engineering principles. In C. J. Evans, J. J. Bryant, & K. Motohara (Eds.), Ground-based and Airborne Instrumentation for Astronomy IX (pp. 1-15). Article 121846N (Proceedings of SPIE; Vol. 12184). SPIE. https://doi.org/10.1117/12.2627903

@inproceedings{c3fce8f25e484fe0b3e0156b6e0230e4,

title = "AESOP, the 4MOST fibre positioner: engineering principles",

abstract = "The Australian Astronomical Observatory's (AAO's) AESOP project is part of the Multi-Object Spectrograph Telescope (4MOST) system for the VISTA telescope. It includes the 2436-fibre positioner, space frame and electronics enclosures. The AESOP concept and the role of the AAO in the 4MOST project have been described in previous SPIE proceedings. The project final assembly stage has been completed. In this paper, engineering principles applied during assembly of critical components and testing of the instrument are discussed.The major performance requirement for AESOP is that all 2436 science fiber cores and 12 guide fiber bundles are to be re-positioned to an accuracy of 10 micron within 1 minute. With a fast prime-focus focal-ratio, a close tolerance on the axial position of the fiber tips must be held so efficiency does not suffer from de-focus losses. Positioning accuracy is controlled with the metrology cameras installed on the telescope, which measures the positions of the fiber tips to an accuracy of a few micrometers and allows iterative positioning until all fiber tips are within tolerance on the focal surface plane. Maintaining co-planarity of the fiber tips requires accurate control in the assembly of several components that contribute to such errors.AESOP requires a consistent production of high accuracy components and assemblies in a quantity of above 2500 items. To achieve this, we had to apply the highest engineering standards, including assembly procedures, metrology, and control systems. We designed many jigs and fixtures, which enabled us to produce high quality components and assemblies at reasonable cost. The results - working instrument was vastly achieved with the help of university students after providing a training in engineering practices.",

keywords = "Fiber positioner, piezoelectric actuators, jig, fixture, metrology, AESOP, VISTA, 4MOST",

author = "Jurek Brzeski and Dave Adams and Gabriella Baker and Sufyan Baker and Rebecca Brown and Scott Case and Timothy Chin and Jack Coyne and Tony Farrell and James Gibson and Peter Gillingham and Ellen Houston and Urs Klauser and Yevgen Kripak and Nirmala Kunwar and Jon Lawrence and Slavko Mali and Wojtek Maslak and Helen McGregor and Rolf Muller and Vijay Nichani and Naveen Pai and Ellie O'brien and Robert Patterson and Will Saunders and Scott Smedley and Sudharshan Venkatesan and Minh Vuong and Lew Waller and Jahanzeb Zahoor and Jessica Zheng",

year = "2022",

doi = "10.1117/12.2627903",

language = "English",

isbn = "9781510653498",

series = "Proceedings of SPIE",

publisher = "SPIE",

pages = "1--15",

editor = "Evans, {Christopher J.} and Bryant, {Julia J.} and Kentaro Motohara",

booktitle = "Ground-based and Airborne Instrumentation for Astronomy IX",

address = "United States",

note = "Conference on Ground-based and Airborne Instrumentation for Astronomy IX ; Conference date: 17-07-2022 Through 22-07-2022",

}

Brzeski, J, Adams, D, Baker, G, Baker, S, Brown, R, Case, S, Chin, T, Coyne, J, Farrell, T, Gibson, J, Gillingham, P, Houston, E, Klauser, U, Kripak, Y, Kunwar, N , Lawrence, J, Mali, S, Maslak, W, McGregor, H, Muller, R, Nichani, V, Pai, N, O'brien, E, Patterson, R, Saunders, W, Smedley, S, Venkatesan, S, Vuong, M, Waller, L, Zahoor, J & Zheng, J 2022, AESOP, the 4MOST fibre positioner: engineering principles. in CJ Evans, JJ Bryant & K Motohara (eds), Ground-based and Airborne Instrumentation for Astronomy IX., 121846N, Proceedings of SPIE, vol. 12184, SPIE, Washington, DC, pp. 1-15, Conference on Ground-based and Airborne Instrumentation for Astronomy IX, Montreal, Canada, 17/07/22. https://doi.org/10.1117/12.2627903

AESOP, the 4MOST fibre positioner: engineering principles. / Brzeski, Jurek; Adams, Dave; Baker, Gabriella et al.
Ground-based and Airborne Instrumentation for Astronomy IX. ed. / Christopher J. Evans; Julia J. Bryant; Kentaro Motohara. Washington, DC: SPIE, 2022. p. 1-15 121846N (Proceedings of SPIE; Vol. 12184).

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

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T2 - Conference on Ground-based and Airborne Instrumentation for Astronomy IX

AU - Brzeski, Jurek

AU - Adams, Dave

AU - Baker, Gabriella

AU - Baker, Sufyan

AU - Brown, Rebecca

AU - Case, Scott

AU - Chin, Timothy

AU - Coyne, Jack

AU - Farrell, Tony

AU - Gibson, James

AU - Gillingham, Peter

AU - Houston, Ellen

AU - Klauser, Urs

AU - Kripak, Yevgen

AU - Kunwar, Nirmala

AU - Lawrence, Jon

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AU - Maslak, Wojtek

AU - McGregor, Helen

AU - Muller, Rolf

AU - Nichani, Vijay

AU - Pai, Naveen

AU - O'brien, Ellie

AU - Patterson, Robert

AU - Saunders, Will

AU - Smedley, Scott

AU - Venkatesan, Sudharshan

AU - Vuong, Minh

AU - Waller, Lew

AU - Zahoor, Jahanzeb

AU - Zheng, Jessica

PY - 2022

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N2 - The Australian Astronomical Observatory's (AAO's) AESOP project is part of the Multi-Object Spectrograph Telescope (4MOST) system for the VISTA telescope. It includes the 2436-fibre positioner, space frame and electronics enclosures. The AESOP concept and the role of the AAO in the 4MOST project have been described in previous SPIE proceedings. The project final assembly stage has been completed. In this paper, engineering principles applied during assembly of critical components and testing of the instrument are discussed.The major performance requirement for AESOP is that all 2436 science fiber cores and 12 guide fiber bundles are to be re-positioned to an accuracy of 10 micron within 1 minute. With a fast prime-focus focal-ratio, a close tolerance on the axial position of the fiber tips must be held so efficiency does not suffer from de-focus losses. Positioning accuracy is controlled with the metrology cameras installed on the telescope, which measures the positions of the fiber tips to an accuracy of a few micrometers and allows iterative positioning until all fiber tips are within tolerance on the focal surface plane. Maintaining co-planarity of the fiber tips requires accurate control in the assembly of several components that contribute to such errors.AESOP requires a consistent production of high accuracy components and assemblies in a quantity of above 2500 items. To achieve this, we had to apply the highest engineering standards, including assembly procedures, metrology, and control systems. We designed many jigs and fixtures, which enabled us to produce high quality components and assemblies at reasonable cost. The results - working instrument was vastly achieved with the help of university students after providing a training in engineering practices.

AB - The Australian Astronomical Observatory's (AAO's) AESOP project is part of the Multi-Object Spectrograph Telescope (4MOST) system for the VISTA telescope. It includes the 2436-fibre positioner, space frame and electronics enclosures. The AESOP concept and the role of the AAO in the 4MOST project have been described in previous SPIE proceedings. The project final assembly stage has been completed. In this paper, engineering principles applied during assembly of critical components and testing of the instrument are discussed.The major performance requirement for AESOP is that all 2436 science fiber cores and 12 guide fiber bundles are to be re-positioned to an accuracy of 10 micron within 1 minute. With a fast prime-focus focal-ratio, a close tolerance on the axial position of the fiber tips must be held so efficiency does not suffer from de-focus losses. Positioning accuracy is controlled with the metrology cameras installed on the telescope, which measures the positions of the fiber tips to an accuracy of a few micrometers and allows iterative positioning until all fiber tips are within tolerance on the focal surface plane. Maintaining co-planarity of the fiber tips requires accurate control in the assembly of several components that contribute to such errors.AESOP requires a consistent production of high accuracy components and assemblies in a quantity of above 2500 items. To achieve this, we had to apply the highest engineering standards, including assembly procedures, metrology, and control systems. We designed many jigs and fixtures, which enabled us to produce high quality components and assemblies at reasonable cost. The results - working instrument was vastly achieved with the help of university students after providing a training in engineering practices.

KW - Fiber positioner

KW - piezoelectric actuators

KW - jig

KW - fixture

KW - metrology

KW - AESOP

KW - VISTA

KW - 4MOST

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U2 - 10.1117/12.2627903

DO - 10.1117/12.2627903

M3 - Conference proceeding contribution

SN - 9781510653498

T3 - Proceedings of SPIE

SP - 1

EP - 15

BT - Ground-based and Airborne Instrumentation for Astronomy IX

A2 - Evans, Christopher J.

A2 - Bryant, Julia J.

A2 - Motohara, Kentaro

PB - SPIE

CY - Washington, DC

Y2 - 17 July 2022 through 22 July 2022

ER -

AESOP, the 4MOST fibre positioner: engineering principles

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