First results of the wind evaluation breadboard for ELT primary mirror design

Marcos Reyes García-Talavera; Teodora Viera; Miguel Núñez

doi:10.1117/12.857352

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4 August 2010 First results of the wind evaluation breadboard for ELT primary mirror design

Marcos Reyes García-Talavera, Teodora Viera, Miguel Núñez

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Proceedings Volume 7733, Ground-based and Airborne Telescopes III; 77332I (2010) https://doi.org/10.1117/12.857352
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

The Wind Evaluation Breadboard (WEB) is a primary mirror and telescope simulator formed by seven aluminium segments, including position sensors, electromechanical support systems and support structures. WEB has been developed to evaluate technologies for primary mirror wavefront control and to evaluate the performance of the control of wind buffeting disturbance on ELT segmented mirrors. For this purpose WEB electro-mechanical set-up simulates the real operational constrains applied to large segmented mirrors. This paper describes the WEB assembly, integration and verification, the instrument characterisation and close loop control design, including the dynamical characterization of the instrument and the control architecture. The performance of the new technologies developed for position sensing, acting and controlling is evaluated. The integration of the instrument in the observatory and the results of the first experiments are summarised, with different wind conditions, elevation and azimuth angles of incidence. Conclusions are extracted with respect the wind rejection performance and the control strategy for an ELT. WEB has been designed and developed by IAC, ESO, ALTRAN and JUPASA, with the integration of subsystems of FOGALE and TNO.

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Marcos Reyes García-Talavera, Teodora Viera, and Miguel Núñez "First results of the wind evaluation breadboard for ELT primary mirror design", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77332I (4 August 2010); https://doi.org/10.1117/12.857352

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