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CHOUGH: implementation and performance of a high-order 4m AO demonstrator

Bharmal, Nazim A.; Basden, Alastair G.; Bourgenot, Cyril J.; Black, Martin; Dubbeldam, Cornelis M.; Henry, David M.; Hölck-Santibanez, Daniel; Morris, Timothy J.; Robertson, David J.; Schmoll, Jürgen; Talbot, Robert G.; Younger, Eddy J.; Myers, Richard M.

Authors

Nazim A. Bharmal

Alastair G. Basden

Martin Black

Cornelis M. Dubbeldam

David M. Henry

Daniel Hölck-Santibanez

David J. Robertson

Jürgen Schmoll

Robert G. Talbot

Eddy J. Younger

Richard M. Myers



Contributors

Enrico Marchetti
Editor

Laird M. Close
Editor

Jean-Pierre Véran
Editor

Abstract

CHOUGH is a small, fast project to provide an experimental on-sky high-order SCAO capability to the 4.2m WHT telescope. The basic goal has r0-sized sub- apertures with the aim of achieving high-Strehl ratios (> 0:5) in the visible (> 650 nm). It achieves this by including itself into the CANARY experiment: CHOUGH is mounted as a breadboard and intercepts the beam within CANARY via a periscope. In doing so, it takes advantage of the mature CANARY infrastructure, but add new AO capabilities. The key instruments that CHOUGH brings to CANARY are: an atmospheric dispersion compensator; a 32 × 32 (1000 actuator) MEMS deformable mirror; 31 × 31 wavefront sensor; and a complementary (narrow-field) imager. CANARY provides a 241-actuator DM, tip/tilt mirror, and comprehensive off-sky alignment facility together with a RTC. In this work, we describe the CHOUGH sub-systems: backbone, ADC, MEMS-DM, HOWFS, CAWS, and NFSI.

Citation

Bharmal, N. A., Basden, A. G., Bourgenot, C. J., Black, M., Dubbeldam, C. M., Henry, D. M., Hölck-Santibanez, D., Morris, T. J., Robertson, D. J., Schmoll, J., Talbot, R. G., Younger, E. J., & Myers, R. M. (2016, July). CHOUGH: implementation and performance of a high-order 4m AO demonstrator. Presented at Adaptive Optics Systems V, Edinburgh

Presentation Conference Type Conference Paper (published)
Conference Name Adaptive Optics Systems V
Online Publication Date Jul 27, 2016
Publication Date 2016-07
Deposit Date Nov 29, 2016
Publisher SPIE
Volume 9909
Pages 990948-990948-7
Book Title Adaptive Optics Systems V
DOI https://doi.org/10.1117/12.2231721
Public URL https://durham-repository.worktribe.com/output/1150614