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Proceedings Paper

The DESI fiber positioner system
Author(s): Michael Schubnell; Jon Ameel; Robert W. Besuner; Irena Gershkovich; Philipp Hoerler; Jean-Paul Kneib; Henry D. Heetderks; Joseph H. Silber; Gregory Tarlé; Curtis Weaverdyck
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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. A new prime focus corrector for the KPNO Mayall telescope will deliver light to 5,000 fiber optic positioners feeding ten broad-band spectrographs. The positioners have eccentric axis kinematics. Actuation is provided by two 4mm diameter DC brushless gear-motors. An attached electronics board accepts a DC voltage for power and CAN messages for communications and drives the two motors. The positioner accepts the ferrulized and polished fiber and provides a mechanically safe path through its internal mechanism. Positioning is rapid and accurate with typical RMS errors of less than 5 μm.

Paper Details

Date Published: 9 August 2016
PDF: 6 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990892 (9 August 2016); doi: 10.1117/12.2233370
Show Author Affiliations
Michael Schubnell, Univ. of Michigan (United States)
Jon Ameel, Univ. of Michigan (United States)
Robert W. Besuner, Space Sciences Lab., Univ. of California, Berkeley (United States)
Irena Gershkovich, Univ. of Michigan (United States)
Philipp Hoerler, Space Sciences Lab., Univ. of California, Berkeley (United States)
Jean-Paul Kneib, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Henry D. Heetderks, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Joseph H. Silber, Lawrence Berkeley National Lab. (United States)
Gregory Tarlé, Univ. of Michigan (United States)
Curtis Weaverdyck, Univ. of Michigan (United States)


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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