Correcting Turbulence-induced Errors in Fiber Positioning for the Dark Energy Spectroscopic Instrument
Abstract
Highly-multiplexed, robotic, fiber-fed spectroscopic surveys are observing tens of millions of stars and galaxies. For many systems, accurate positioning relies on imaging the fibers in the focal plane and feeding that information back to the robotic positioners to correct their positions. Inhomogeneities and turbulence in the air between the focal plane and the imaging camera can affect the measured positions of fibers, limiting the accuracy with which fibers can be placed on targets. For the Dark Energy Spectroscopic Instrument, we dramatically reduced the effect of turbulence on measurements of positioner locations in the focal plane by taking advantage of stationary positioners and the correlation function of the turbulence. We were able to reduce positioning errors from 7.3 microns to 3.5 microns, speeding the survey by 1.6% under typical conditions.
Keywords
Cite
@article{arxiv.2407.08026,
title = {Correcting Turbulence-induced Errors in Fiber Positioning for the Dark Energy Spectroscopic Instrument},
author = {E. F. Schlafly and J. Guy and K. Honscheid and S. Kent and S. E. Koposov and J. Aguilar and S. Ahlen and S. Bailey and D. Brooks and T. Claybaugh and K. Dawson and P. Doel and K. Fanning and D. P. Finkbeiner and A. Font-Ribera and J. E. Forero-Romero and S. Gontcho A Gontcho and G. Gutierrez and D. Kirkby and T. Kisner and A. Kremin and J. Lasker and M. Landriau and L. Le Guillou and M. E. Levi and A. de la Macorra and P. Martini and A. Meisner and R. Miquel and J. Moustakas and G. Niz and F. Prada and G. Rossi and E. Sanchez and M. Schubnell and R. Sharples and D. Sprayberry and G. Tarlé and B. A. Weaver and H. Zou},
journal= {arXiv preprint arXiv:2407.08026},
year = {2025}
}
Comments
11 pages, 5 figures. Update to author's version of published version