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Proceedings Paper

Integration, alignment, and verification of the ESPRESSO Front-End
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Paper Abstract

ESPRESSO, Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations, is now under the assembly, integration and verification phase and will be installed beginning next year at Paranal Observatory on ESO's Very Large Telescopes. The Front End is the modular system in the Combined Coudé Laboratory receiving the light from the four VLT Units, providing the needed connection between the input signal, i.e., object light, sky light, and calibration light, to feed the spectrograph through optical fibers. The modular concept of the FE Units drove the system design and the alignment workflow. We will show the integration method of the single FE modules adopted to guarantee the necessary repeatability between the different Units. The performances of the system in terms of image quality and encircled energy in the observed point spread function are reported. Finally, the strategy followed in the Paranal Combined Coudè Laboratory to define the convergence point of the four UTs is described, along with the procedure used to align the ground plates, the main structure, and the mode selector.

Paper Details

Date Published: 9 August 2016
PDF: 9 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99087B (9 August 2016); doi: 10.1117/12.2233997
Show Author Affiliations
G. Pariani, INAF - Osservatorio Astronomico di Brera (Italy)
M. Aliverti, INAF - Osservatorio Astronomico di Brera (Italy)
M. Moschetti, INAF - Osservatorio Astronomico di Brera (Italy)
M. Landoni, INAF - Osservatorio Astronomico di Brera (Italy)
M. Riva, INAF - Osservatorio Astronomico di Brera (Italy)
F. M. Zerbi, INAF - Osservatorio Astronomico di Brera (Italy)
D. Mégevand, Observatoire Asronomique de l'Univ. de Genève (Switzerland)
S. Cristiani, INAF - Osservatorio Astronomico di Trieste (Italy)
F. Pepe, Observatoire Asronomique de l'Univ. de Genève (Switzerland)


Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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