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--- science:results:taofisrtlight [2024/12/18 14:48] – created etienne
+++ science:results:taofisrtlight [2024/12/18 14:49] (current) – etienne
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 ===== TAO (Themis Adaptive Optics) 1st light =====
-**TAO** stands for **THEMIS Adaptive Optics**. It is made of a classical solar AO hardware currently running at 1 kHz and combining a Shack-Hartmann wavefront sensor with 76 subapertures (10x10 geometry) and a deformable mirror DM97 from ALPAO with 97 actuators. See **[[themis_ao_system_descr| TAO system description]]** for more technical details.  It was implemented by the Themis team (IRL-FSLAC), after integration at CRAL (CNRS/UMR 5574). **Innovative algorithms** are used for solar wavefront sensing and the control loop, based on an end-to-end inverse approach and a minimum variance estimator. Commands are computed iteratively, without any matrix inversion, using a method developped for Extremely Large Telescopes.
+**TAO** stands for **THEMIS Adaptive Optics**. It is made of a classical solar AO hardware currently running at 1 kHz and combining a Shack-Hartmann wavefront sensor with 76 subapertures (10x10 geometry) and a deformable mirror DM97 from ALPAO with 97 actuators. See **[[technical:tao| TAO system description]]** for more technical details.  It was implemented by the Themis team (IRL-FSLAC), after integration at CRAL (CNRS/UMR 5574). **Innovative algorithms** are used for solar wavefront sensing and the control loop, based on an end-to-end inverse approach and a minimum variance estimator. Commands are computed iteratively, without any matrix inversion, using a method developped for Extremely Large Telescopes.
 On Dec 8th, 2020 TAO started running in closed-loop over the solar granulation and the existing sunspot at that moment (NOAA 12790). We present here some preliminary and extremely encouraging results, while the closed-loop algorithm is not yet fully implemented.