The image quality of the Southern African Large Telescope (SALT)

Darragh E. O'Donoghue; Eli Atad-Ettedgui; Luis Balona; Bruce C. Bigelow; John A. Booth; Lucian Botha; Janus D. Brink; David A.H. Buckley; Phil Charles; Alrin Christians; J. Christopher Clemens; Lisa A. Crause; Steven M. Crawford; Geoffrey P. Evans; Hitesh Gajjar; Yas Hashimoto; Malcolm Hendricks; Alexei Kniazev; Anthony R. Koeslag; Willie P. Koorts; Herman J. Kriel; Nicola S. Loaring; Jonathan Love; Fred Marang; Douglas Metcalfe; Brennan Meyer; James O'Connor; Charl A. Du Plessis; Lawrence W. Ramsey; Encarni Romero-Colmenero; Craig Sass; Johann C. Scholtz; Ramotholo Sefako; Sandisa Siyengo; Martin Still; Ockert J. Strydom; Arkadiusz Swat; Johann F. Du Toit; Petri Vaisanen; Martyn Wells; Hannah Worters

doi:10.1117/12.788841

The image quality of the Southern African Large Telescope (SALT)

Darragh E. O'Donoghue, Eli Atad-Ettedgui, Luis Balona, Bruce C. Bigelow, John A. Booth, Lucian Botha, Janus D. Brink, David A.H. Buckley, Phil Charles, Alrin Christians, J. Christopher Clemens, Lisa A. Crause, Steven M. Crawford, Geoffrey P. Evans, Hitesh Gajjar, Yas Hashimoto, Malcolm Hendricks, Alexei Kniazev, Anthony R. Koeslag, Willie P. KoortsHerman J. Kriel, Nicola S. Loaring, Jonathan Love, Fred Marang, Douglas Metcalfe, Brennan Meyer, James O'Connor, Charl A. Du Plessis, Lawrence W. Ramsey, Encarni Romero-Colmenero, Craig Sass, Johann C. Scholtz, Ramotholo Sefako, Sandisa Siyengo, Martin Still, Ockert J. Strydom, Arkadiusz Swat, Johann F. Du Toit, Petri Vaisanen, Martyn Wells, Hannah Worters

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

14 Citations (Scopus)

Abstract

Construction of the Southern African Large Telescope (SALT) was largely completed by the end of 2005 and since then it has been in intensive commissioning. This has now almost been completed except for the telescope's image quality which shows optical aberrations, chiefly a focus gradient across the focal plane, along with astigmatism and other less significant aberrations. This paper describes the optical systems engineering investigation that has been conducted since early 2006 to diagnose the problem. A rigorous approach has been followed which has entailed breaking down the system into the major sub-systems and subjecting them to testing on an individual basis. Significant progress has been achieved with many components of the optical system shown to be operating correctly. The fault has been isolated to a major optical sub-system. We present the results obtained so far, and discuss what remains to be done.

Original language	English
Title of host publication	Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
DOIs	https://doi.org/10.1117/12.788841
Publication status	Published - 2008
Externally published	Yes
Event	Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation - Marseille, France Duration: 2008 Jun 23 → 2008 Jun 28

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7018
ISSN (Print)	0277-786X

Other

Other	Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Country/Territory	France
City	Marseille
Period	2008/06/23 → 2008/06/28

Keywords

Astigmatism
Focus gradient
Image quality
Optical aberrations
SAC
SALT
Southern African Large Telescope
Spherical aberration corrector

ASJC Scopus subject areas

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

Access to Document

10.1117/12.788841

Cite this

O'Donoghue, D. E., Atad-Ettedgui, E., Balona, L., Bigelow, B. C., Booth, J. A., Botha, L., Brink, J. D., Buckley, D. A. H., Charles, P., Christians, A., Clemens, J. C., Crause, L. A., Crawford, S. M., Evans, G. P., Gajjar, H., Hashimoto, Y., Hendricks, M., Kniazev, A., Koeslag, A. R., ... Worters, H. (2008). The image quality of the Southern African Large Telescope (SALT). In Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation Article 701813 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7018). https://doi.org/10.1117/12.788841

The image quality of the Southern African Large Telescope (SALT). / O'Donoghue, Darragh E.; Atad-Ettedgui, Eli; Balona, Luis et al.
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation. 2008. 701813 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7018).

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

O'Donoghue, DE, Atad-Ettedgui, E, Balona, L, Bigelow, BC, Booth, JA, Botha, L, Brink, JD, Buckley, DAH, Charles, P, Christians, A, Clemens, JC, Crause, LA, Crawford, SM, Evans, GP, Gajjar, H, Hashimoto, Y, Hendricks, M, Kniazev, A, Koeslag, AR, Koorts, WP, Kriel, HJ, Loaring, NS, Love, J, Marang, F, Metcalfe, D, Meyer, B, O'Connor, J, Du Plessis, CA, Ramsey, LW, Romero-Colmenero, E, Sass, C, Scholtz, JC, Sefako, R, Siyengo, S, Still, M, Strydom, OJ, Swat, A, Du Toit, JF, Vaisanen, P, Wells, M & Worters, H 2008, The image quality of the Southern African Large Telescope (SALT). in Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation., 701813, Proceedings of SPIE - The International Society for Optical Engineering, vol. 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, Marseille, France, 2008/06/23. https://doi.org/10.1117/12.788841

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title = "The image quality of the Southern African Large Telescope (SALT)",

abstract = "Construction of the Southern African Large Telescope (SALT) was largely completed by the end of 2005 and since then it has been in intensive commissioning. This has now almost been completed except for the telescope's image quality which shows optical aberrations, chiefly a focus gradient across the focal plane, along with astigmatism and other less significant aberrations. This paper describes the optical systems engineering investigation that has been conducted since early 2006 to diagnose the problem. A rigorous approach has been followed which has entailed breaking down the system into the major sub-systems and subjecting them to testing on an individual basis. Significant progress has been achieved with many components of the optical system shown to be operating correctly. The fault has been isolated to a major optical sub-system. We present the results obtained so far, and discuss what remains to be done.",

keywords = "Astigmatism, Focus gradient, Image quality, Optical aberrations, SAC, SALT, Southern African Large Telescope, Spherical aberration corrector",

author = "O'Donoghue, {Darragh E.} and Eli Atad-Ettedgui and Luis Balona and Bigelow, {Bruce C.} and Booth, {John A.} and Lucian Botha and Brink, {Janus D.} and Buckley, {David A.H.} and Phil Charles and Alrin Christians and Clemens, {J. Christopher} and Crause, {Lisa A.} and Crawford, {Steven M.} and Evans, {Geoffrey P.} and Hitesh Gajjar and Yas Hashimoto and Malcolm Hendricks and Alexei Kniazev and Koeslag, {Anthony R.} and Koorts, {Willie P.} and Kriel, {Herman J.} and Loaring, {Nicola S.} and Jonathan Love and Fred Marang and Douglas Metcalfe and Brennan Meyer and James O'Connor and {Du Plessis}, {Charl A.} and Ramsey, {Lawrence W.} and Encarni Romero-Colmenero and Craig Sass and Scholtz, {Johann C.} and Ramotholo Sefako and Sandisa Siyengo and Martin Still and Strydom, {Ockert J.} and Arkadiusz Swat and {Du Toit}, {Johann F.} and Petri Vaisanen and Martyn Wells and Hannah Worters",

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AU - O'Donoghue, Darragh E.

AU - Atad-Ettedgui, Eli

AU - Balona, Luis

AU - Bigelow, Bruce C.

AU - Booth, John A.

AU - Botha, Lucian

AU - Brink, Janus D.

AU - Buckley, David A.H.

AU - Charles, Phil

AU - Christians, Alrin

AU - Clemens, J. Christopher

AU - Crause, Lisa A.

AU - Crawford, Steven M.

AU - Evans, Geoffrey P.

AU - Gajjar, Hitesh

AU - Hashimoto, Yas

AU - Hendricks, Malcolm

AU - Kniazev, Alexei

AU - Koeslag, Anthony R.

AU - Koorts, Willie P.

AU - Kriel, Herman J.

AU - Loaring, Nicola S.

AU - Love, Jonathan

AU - Marang, Fred

AU - Metcalfe, Douglas

AU - Meyer, Brennan

AU - O'Connor, James

AU - Du Plessis, Charl A.

AU - Ramsey, Lawrence W.

AU - Romero-Colmenero, Encarni

AU - Sass, Craig

AU - Scholtz, Johann C.

AU - Sefako, Ramotholo

AU - Siyengo, Sandisa

AU - Still, Martin

AU - Strydom, Ockert J.

AU - Swat, Arkadiusz

AU - Du Toit, Johann F.

AU - Vaisanen, Petri

AU - Wells, Martyn

AU - Worters, Hannah

PY - 2008

Y1 - 2008

N2 - Construction of the Southern African Large Telescope (SALT) was largely completed by the end of 2005 and since then it has been in intensive commissioning. This has now almost been completed except for the telescope's image quality which shows optical aberrations, chiefly a focus gradient across the focal plane, along with astigmatism and other less significant aberrations. This paper describes the optical systems engineering investigation that has been conducted since early 2006 to diagnose the problem. A rigorous approach has been followed which has entailed breaking down the system into the major sub-systems and subjecting them to testing on an individual basis. Significant progress has been achieved with many components of the optical system shown to be operating correctly. The fault has been isolated to a major optical sub-system. We present the results obtained so far, and discuss what remains to be done.

AB - Construction of the Southern African Large Telescope (SALT) was largely completed by the end of 2005 and since then it has been in intensive commissioning. This has now almost been completed except for the telescope's image quality which shows optical aberrations, chiefly a focus gradient across the focal plane, along with astigmatism and other less significant aberrations. This paper describes the optical systems engineering investigation that has been conducted since early 2006 to diagnose the problem. A rigorous approach has been followed which has entailed breaking down the system into the major sub-systems and subjecting them to testing on an individual basis. Significant progress has been achieved with many components of the optical system shown to be operating correctly. The fault has been isolated to a major optical sub-system. We present the results obtained so far, and discuss what remains to be done.

KW - Astigmatism

KW - Focus gradient

KW - Image quality

KW - Optical aberrations

KW - SAC

KW - SALT

KW - Southern African Large Telescope

KW - Spherical aberration corrector

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T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

T2 - Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

Y2 - 23 June 2008 through 28 June 2008

ER -

The image quality of the Southern African Large Telescope (SALT)

Abstract

Publication series

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Keywords

ASJC Scopus subject areas

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