Optimal Natural Guide Star Acquisition for the LINC-NIRVANA MCAO system
Xianyu Zhang, Thomas Bertram, Wolfgang Gaessler, Tom Herbst, Martin Kuerster, Albert R. Conrad, Carmelo Arcidiacono, De Bonis Fulvio, Peter Bizenberger, Daniel Meschke, Hans-Walter Rix, Changhui Rao, Lars Mohr, Florian Briegel, Frank Kittmann, Juergen Berwein, Jan Trowitzsch, Laura Schreiber, Jacopo Farinato, Emiliano Diolaiti, Roberto Ragazzoni
Max-Planck-Institut fuer Astronomie The Institute of Optics And Electronics, CAS INAF - Astronomical Observatory of BOLOGNA INAF - Osservatorio Astrofisico di Arcetri INAF -Astronomical Observatory of Padova Graduate School of Chinese Academy of Sciences
Based on the lab setup for LINC-NIRVANA, we describe how to optimally position star enlargers to acquire multiple natural guide stars, in parallel and without collision. LINC-NIRVANA is a LO-MCAO system which uses up to 20 natural guide stars within a 6 arcminute field of view, each sensed in one of two discrete atomospheric layers, to produce an infrared interferometric image for the Large Binocular Telescope (LBT). The MCAO can increase the sky coverage which is critical for AO systems on ground based telescopes, especially for the extremely large telescope (ELT). So optimal natural guide star acquisition is important for the ELT.