Development of cryogenic components based on COTS parts for the HARMONI instrument
Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 9908 (2016) 99089u-99089u-19
Preliminary design study of the integral field unit for the E-ELT Harmoni instrument
Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 9908 (2016) 99089t-99089t-11
Simulated observations of high-redshift galaxies with the HARMONI spectrograph for the European Extremely Large Telescope
Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 9908 (2016) 99089y-99089y-9
The E-ELT first light spectrograph HARMONI: capabilities and modes
Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 9908 (2016) 99081x-99081x-11
Natural guide-star processing for wide-field laser-assisted AO systems
Adaptive Optics Systems V Society of Photo-optical Instrumentation Engineers (2016)
Abstract:
Sky-coverage in laser-assisted AO observations largely depends on the system's capability to guide on the faintest natural guide-stars possible. Here we give an up-to-date status of our natural guide-star processing tailored to the European-ELT's visible and near-infrared (0.47 to 2.45 μm) integral field spectrograph — Harmoni.We tour the processing of both the isoplanatic and anisoplanatic tilt modes using the spatio-angular approach whereby the wavefront is estimated directly in the pupil plane avoiding a cumbersome explicit layered estimation on the 35-layer profiles we're currently using.
Taking the case of Harmoni, we cover the choice of wave-front sensors, the number and field location of guide-stars, the optimised algorithms to beat down angular anisoplanatism and the performance obtained with different temporal controllers under split high-order/low-order tomography or joint tomography. We consider both atmospheric and far greater telescope wind buffeting disturbances. In addition we provide the sky-coverage estimates thus obtained.