5 October 2012 'MOHAWK: a 4000-fiber positioner for DESpec
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Abstract
We present a concept for a 4000-fibre positioner for DESpec, based on the Echidna ‘tilting spine’ technology. The DESpec focal plane is 450mm across and curved, and the required pitch is ~6.75mm. The size, number of fibers and curvature are all comparable with various concept studies for similar instruments already undertaken at the AAO, but present new challenges in combination. A simple, low-cost, and highly modular design is presented, consisting of identical modules populated by identical spines. No show-stopping issues in accommodating either the curvature or the smaller pitch have been identified, and the actuators consist largely of off-the-shelf components. The actuators have been prototyped at AAO, and allow reconfiguration times of ~15s to reach position errors 7 microns or less. Straightforward designs for metrology, acquisition, and guiding are also proposed. The throughput losses of the entire positioner system are estimated to be ~15%, of which 6.3% is attributable to the tilting-spine technology.
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Will Saunders, Greg Smith, James Gilbert, Rolf Muller, Michael Goodwin, Nick Staszak, Jurek Brzeski, Stan Miziarski, Matthew Colless, "'MOHAWK: a 4000-fiber positioner for DESpec", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84464W (5 October 2012); doi: 10.1117/12.925724; https://doi.org/10.1117/12.925724
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