Faulty actuator tolerance in deformable mirrors for Extremely Large Telescope multi-object adaptive optics

Basden, A.G.

doi:10.1093/mnras/stu315

Faulty actuator tolerance in deformable mirrors for Extremely Large Telescope multi-object adaptive optics

Basden, A.G.

Authors

Dr Alastair Basden a.g.basden@durham.ac.uk
Hpc Technical Manager

Abstract

Planned instruments utilizing multi-object adaptive optics systems on the forthcoming extremely large telescopes require large numbers of high order deformable mirrors. These devices are a significant cost driver, particularly if specifications regarding the number of faulty actuators are stringent. Here, we investigate the effect on adaptive optics performance that such faulty actuators have, and draw conclusions about how far faulty actuator specifications (and hence cost) can be relaxed without having a significant effect on adaptive optics performance. We also provide performance estimates using a map of faulty actuators from an existing deformable mirror. We investigate the effect of faulty actuators using an end-to-end Monte Carlo adaptive optics simulation code. We find that for actuators stuck at a fixed height above the deformable mirror surface, between 1 and 2 per cent of actuators can be faulty before significant performance degradation occurs. For actuators that are a coupled to nearest neighbours, up to about 5 per cent, can be faulty before adaptive optics (AO) performance begins to be affected.

Citation

Basden, A. (2014). Faulty actuator tolerance in deformable mirrors for Extremely Large Telescope multi-object adaptive optics. Monthly Notices of the Royal Astronomical Society, 440(1), 577-581. https://doi.org/10.1093/mnras/stu315

Journal Article Type	Article
Publication Date	May 1, 2014
Deposit Date	Oct 22, 2014
Publicly Available Date	Oct 24, 2014
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	440
Issue	1
Pages	577-581
DOI	https://doi.org/10.1093/mnras/stu315
Keywords	Instrumentation: adaptive optics, Instrumentation: high angular resolution, Methods: numerical.

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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.