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IS-AUR-Samarb.progr. Norge Frankrike

ETKF for the Adaptive Optics on the European Extremely Large Telescope (E-ELT)

Awarded: NOK 30,000

The project considers the application of ensemble data assimilation techniques to the advanced Adaptive Optics (AO) of the E-ELT, the future largest telescope in the world. This is justified by the increasing complexity of AO systems and the need to corr ect high-dimensional AO systems for atmospheric turbulence. The classical Kalman Filter will soon become intractable in AO systems, which justifies the exploration of ensemble data assimilation techniques borrowed from the fields of geophysics and first i ntroduced at NERSC in Norway. By comparison to the classical Kalman Filter, the data assimilation techniques used at NERSC (the EnKF and its variant ETKF) have the two advantages of better scalability and robustness against non-linearities. They are prese ntly used for intensive real-time applications with the TOPAZ ocean forecasting system and make good candidates for improving the AO systems in the planned E-ELT. The project will fund regular visits of Morgan Gray to Norway and two travels from a scient ist at NERSC to meetings at LAM in France over the next two years to set up the assimilation, together with a PhD student (NN, starting Fall 2012) working on methodological developments of Iterative Ensemble Smoothers.

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Funding scheme:

IS-AUR-Samarb.progr. Norge Frankrike