The recently commissioned Dark Energy Spectroscopic Instrument (DESI) will measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique. The spectra of 35 million galaxies and quasars over 14000 sqdeg will be measured during the life of the experiment. A new prime focus corrector for the KPNO Mayall telescope delivers light to 5000 fiber optic positioners. The fibers in turn feed ten broad-band spectrographs. A consortium of Aix-Marseille University (AMU) and CNRS laboratories (LAM, OHP and CPPM) together with LPNHE (CNRS, IN2P3, Sorbonne Universit\'e and Universit\'e de Paris) and the WINLIGHT Systems company based in Pertuis (France), were in charge of integrating and validating the performance requirements of the ten full spectrographs, equipped with their cryostats, shutters and other mechanisms. We present a summary of our activity which allowed an efficient validation of the systems in a short-time schedule. We detail the main results. We emphasize the benefits of our approach and also its limitations.
@article{arxiv.2101.12181,
title = {Testing the 10 spectrograph units for DESI: approach and results},
author = {S. Perruchot and P. -E. Blanc and J. Guy and L. Le Guillou and S. Ronayette and X. Régal and G. Castagnoli and A. Le Van Suu and E. Sepulveda and E. Jullo and J. -G. Cuby and S. Karkar and P. Ghislain and P. Repain and P. -H. Carton and C. Magneville and A. Ealet and S. Escoffier and A. Secroun and K. Honscheid and A. Elliot and P. Jelinsky and D. Brooks and P. Doel and Y. Duan and J. Edelstein and J. C. Estrada and E. Gastañaga and A. Karcher and M. Landriau and M. Levi and P. Martini and P. and N. Palanque-Delabrouille and F. Prada and G. Tarle and K. Zhang},
journal= {arXiv preprint arXiv:2101.12181},
year = {2021}
}