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Please use this identifier to cite or link to this item: http://hdl.handle.net/2014/42391

Title: Development in high-density Cobra fiber positioners for the Subaru Telescope's prime focus spectrometer
Authors: Instrumentation and Photography
Fisher, Charles D.
Braun, David F.
Kaluzny, Joel V.
Seiffert, Mic D.
Dekany, Richard G.
Ellis, Richard S.
Smith, Roger S.
Keywords: Cobra
fiber poistioner
Prime Focus Spectrograph (PFS)
piezo
Issue Date: 1-Jul-2012
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2012.
Citation: SPIE Astronomical Telescopes+Instrumentation, Amsterdam, Netherlands, July 1-6, 2012
Abstract: The Prime Focus Spectrograph (PFS) is a fiber fed multi-object spectrometer for the Subaru Telescope that will conduct a variety of targeted surveys for studies of dark energy, galaxy evolution, and galactic archaeology. The key to the instrument is a high density array of fiber positioners placed at the prime focus of the Subaru Telescope. The system, nicknamed “Cobra”, will be capable of rapidly reconfiguring the array of 2394 optical fibers to the image positions of astronomical targets in the focal plane with high accuracy. The system uses 2394 individual “SCARA robot” mechanisms that are 7.7mm in diameter and use 2 piezo-electric rotary motors to individually position each of the optical fibers within its patrol region. Testing demonstrates that the Cobra positioner can be moved to within 5m of an astronomical target in 6 move iterations with a success rate of 95%. The Cobra system is a key aspect of PFS that will enable its unprecedented combination of high-multiplex factor and observing efficiency on the Subaru telescope. The requirements, design, and prototyping efforts for the fiber positioner system for the PFS are described here as are the plans for modular construction, assembly, integration, functional testing, and performance validation.
URI: http://hdl.handle.net/2014/42391
Appears in Collections:JPL TRS 1992+

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