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Dark Energy Spectroscopic Instrument (DESI) fiber positioner thermal and wind disturbance test
Author(s): Kai Zhang; Joseph H. Silber; Henry D. Heetderks; Daniela Leitner; Michael Schubnell; Michael Levi; Gradey Wang; Kevin Fanning; Parker Fagrelius; Carl Dobson; Jessica Aguilar
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Paper Abstract

The Dark Energy Spectroscopic Instrument (DESI) is under construction to measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique. The spectra of 35 million galaxies and quasars over 14000 sq deg will be measured during the life of the experiment. A new prime focus corrector for the KPNO Mayall telescope will deliver light to 5000 fiber optic positioners. The fibers in turn feed ten broad-band spectrographs. To achieve this goal, it is crucial to guarantee that fiber positioners work properly under the extremes of potential operating conditions, including the full range of temperatures, high speed wind disturbance etc. Thermal testing provides valuable insight into the functionality of the fiber positioners that can be used to help mitigate poor performance at extreme temperatures and wind disturbance test provide guidance to design of ventilation system. Here, we describe the thermal and wind disturbance tests for DESI fiber positioners and how the test results helped improve the robustness of the positioners.

Paper Details

Date Published: 10 July 2018
PDF: 12 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107064R (10 July 2018); doi: 10.1117/12.2314666
Show Author Affiliations
Kai Zhang, Lawrence Berkeley National Lab. (United States)
Joseph H. Silber, Lawrence Berkeley National Lab. (United States)
Henry D. Heetderks, Univ. of California, Berkeley (United States)
Daniela Leitner, Lawrence Berkeley National Lab. (United States)
Michael Schubnell, Univ. of Michigan (United States)
Michael Levi, Lawrence Berkeley National Lab. (United States)
Gradey Wang, Univ. of California, Berkeley (United States)
Kevin Fanning, Univ. of Michigan (United States)
Parker Fagrelius, Lawrence Berkeley National Lab. (United States)
Univ. of California, Berkeley (United States)
Carl Dobson, Lawrence Berkeley National Lab. (United States)
Jessica Aguilar, Lawrence Berkeley National Lab. (United States)


Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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