CaltechAUTHORS
  A Caltech Library Service

Developments in high-density Cobra fiber positioners for the Subaru Telescope’s Prime Focus Spectrometer

Fisher, Charles D. and Braun, David F. and Kaluzny, Joel V. and Seiffert, Michael D. and Dekany, Richard G. and Ellis, Richard S. and Smith, Roger M. (2012) Developments in high-density Cobra fiber positioners for the Subaru Telescope’s Prime Focus Spectrometer. In: Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II. Proceedings of SPIE. No.8450. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 845017. ISBN 9780819491510. https://resolver.caltech.edu/CaltechAUTHORS:20161019-152626905

[img] PDF - Published Version
See Usage Policy.

2925Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20161019-152626905

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 5μm 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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.927161DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1359748PublisherArticle
ORCID:
AuthorORCID
Ellis, Richard S.0000-0001-7782-7071
Additional Information:© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. All of the R&D funding to date has provided by JPL. Support was provided from the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) “Subaru Measurements of Images and Redshifts (SuMIRe)”, CSTP, Japan. The authors would like to thank the following individuals who provided support in conducting this work: Justin Vacca (New Scale Technologies), Rob Culhane (New Scale Technologies), Conrad Hoffman (New Scale Technologies) and Dan Viggiano (New Scale Technologies).
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Council for Science and Technology Policy (CSTP)UNSPECIFIED
Subject Keywords:Cobra, fiber positioner, PFS, piezo
Series Name:Proceedings of SPIE
Issue or Number:8450
Record Number:CaltechAUTHORS:20161019-152626905
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161019-152626905
Official Citation:Charles D. Fisher ; David F. Braun ; Joel V. Kaluzny ; Michael D. Seiffert ; Richard G. Dekany ; Richard S. Ellis and Roger M. Smith "Developments in high-density Cobra fiber positioners for the Subaru Telescope’s Prime Focus Spectrometer", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845017 (September 13, 2012); doi:10.1117/12.927161; http://dx.doi.org/10.1117/12.927161
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71299
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:21 Oct 2016 17:02
Last Modified:26 Nov 2019 11:15

Repository Staff Only: item control page