caa a22 4500 445830263 CHVBK 20180317145313.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10686-011-9234-5 doi (NATIONALLICENCE)springer-10.1007/s10686-011-9234-5 Understanding the behaviour of X-shooter via the application of a physical model [Elektronische Daten] I. Quality control [Paul Bristow, Joël Vernet, Sabine Moehler, Andrea Modigliani, Florian Kerber, Michael Rosa] We show how traditional instrument quality control trending can be augmented by the use of a physical instrument model. The ESO VLT archive contains a detailed record of instrument diagnostics and calibration parameters while ESO quality control monitors changes in critical parameters. The physical model allows changes in positions, orientations and other physical properties of a spectrograph to be determined from standard wavelength calibration exposures via an optimisation process that seeks the physical model parameters that best reproduce the calibration features in the data. We introduce physical model parameters to the quality control monitoring. When applying this technique to archived calibration exposures, we find that the results are sensitive to the combination of parameters open to the optimisation process. Therefore we determine the most favourable set of physical parameters to optimise for each arm. We then show correlations between several physical parameters and instrument temperature sensor readings and epoch. In addition we find clear discontinuities in some physical parameter values that correspond to known maintenance events. Springer Science+Business Media B.V., 2011 VLT nationallicence Physical modelling nationallicence Ray tracing nationallicence X-shooter nationallicence Quality control nationallicence Calibration nationallicence Physical interpretation nationallicence Bristow Paul ESO, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut Vernet Joël ESO, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut Moehler Sabine ESO, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut Modigliani Andrea ESO, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut Kerber Florian ESO, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut Rosa Michael Space Telescope European Co-ordinating Facility, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut Experimental Astronomy Springer Netherlands 31/2-3(2011-10-01), 131-156 0922-6435 31:2-3<131 2011 31 10686 https://doi.org/10.1007/s10686-011-9234-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10686-011-9234-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bristow Paul ESO, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut NATIONALLICENCE 700 1- Vernet Joël ESO, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut NATIONALLICENCE 700 1- Moehler Sabine ESO, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut NATIONALLICENCE 700 1- Modigliani Andrea ESO, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut NATIONALLICENCE 700 1- Kerber Florian ESO, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut NATIONALLICENCE 700 1- Rosa Michael Space Telescope European Co-ordinating Facility, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany aut NATIONALLICENCE 773 0- Experimental Astronomy Springer Netherlands 31/2-3(2011-10-01), 131-156 0922-6435 31:2-3<131 2011 31 10686 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer