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