A study of MOAO behind GLAO for EAGLE

Alastair Basden; Nazim Ali Bharmal; Tim Butterley; Nigel Dipper; Tim Morris; Richard Myers; Andrew Reeves

doi:10.1117/12.925364

13 September 2012 A study of MOAO behind GLAO for EAGLE

Alastair Basden, Nazim Ali Bharmal, Tim Butterley, Nigel Dipper, Tim Morris, Richard Myers, Andrew Reeves

Proceedings Volume 8447, Adaptive Optics Systems III; 84475E (2012) https://doi.org/10.1117/12.925364
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

An MOAO corrected multi-IFU instrument, such as the EAGLE instrument proposed for the E-ELT has a deformable mirror correcting each IFU sub-field. Additionally, EAGLE will also use the E-ELT deformable M4 mirror to apply a global (closed-loop) MOAO correction. Here, we investigate the impact on MOAO performance if a global GLAO correction is applied across the whole field, rather than the optimised global MOAO correction (which may or may not be identical). The differences in M4 correction (between GLAO and optimal MOAO) will depend on the position of IFU pick-offs in the science field, and also on the turbulence, for example, MOAO DM stroke may be minimised if more than the ground layer is corrected by the M4 DM, depending on how fast turbulence decorrelates across the field of view. We consider the impact on MOAO DM stroke, the effect on performance, and study both tomographic and non-tomographic GLAO corrections. Such a situation may arise if for example a combined multi-object spectrograph and multi-IFU instrument is designed, such as would result from the integration of EAGLE with another proposed E-ELT instrument. We demonstrate here that performance of EAGLE will not be significantly affected by being placed behind another such instrument. The results presented will be obtained using full end-to-endMonte-Carlo simulations using the Durham AO Simulation Platform. We also present a number of algorithms which can be used to improve AO performance, both in pixel processing and multi-mirror control.

Citation Download Citation

Alastair Basden, Nazim Ali Bharmal, Tim Butterley, Nigel Dipper, Tim Morris, Richard Myers, and Andrew Reeves "A study of MOAO behind GLAO for EAGLE", Proc. SPIE 8447, Adaptive Optics Systems III, 84475E (13 September 2012); https://doi.org/10.1117/12.925364

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Adaptive optics

Turbulence

Tomography

Telescopes

Wavefront sensors

Actuators

Atmospheric corrections

Show All Keywords

Keywords/Phrases

Search In:

Publication Years