9 August 2016 The DESI fiber positioner system
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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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Schubnell, Michael Schubnell, Jon Ameel, Jon Ameel, Robert W. Besuner, Robert W. Besuner, Irena Gershkovich, Irena Gershkovich, Philipp Hoerler, Philipp Hoerler, Jean-Paul Kneib, Jean-Paul Kneib, Henry D. Heetderks, Henry D. Heetderks, Joseph H. Silber, Joseph H. Silber, Gregory Tarlé, Gregory Tarlé, Curtis Weaverdyck, Curtis Weaverdyck, } "The DESI fiber positioner system", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990892 (9 August 2016); doi: 10.1117/12.2233370; https://doi.org/10.1117/12.2233370


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