Detectors and cryostat design for the SuMIRe Prime Focus Spectrograph (PFS)

James E. Gunn, Michael Carr, Stephen A. Smee, Joe D. Orndorff, Robert H. Barkhouser, Charles L. Bennett, Jenny E. Greene, Timothy Heckman, Hiroshi Karoji, Olivier LeFevre, Hung Hsu Ling, Laurent Martin, Brice Ménard, Hitoshi Murayama, Eric Prieto, David Spergel, Michael A. Strauss, Hajime Sugai, Akitoshi Ueda, Shiang Yu WangRosemary Wyse, Nadia Zakamska

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


We describe the conceptual design of the camera cryostats, detectors, and detector readout electronics for the SuMIRe Prime Focus Spectrograph (PFS) being developed for the Subaru telescope. The SuMIRe PFS will consist of four identical spectrographs, each receiving 600 fibers from a 2400 fiber robotic positioner at the prime focus. Each spectrograph will have three channels covering wavelength ranges 3800 Å - 6700 Å, 6500 Å - 10000 Å, and 9700 Å - 13000 Å, with the dispersed light being imaged in each channel by a f/1.10 vacuum Schmidt camera. In the blue and red channels a pair of Hamamatsu 2K x 4K edge-buttable CCDs with 15 um pixels are used to form a 4K x 4K array. For the IR channel, the new Teledyne 4K x 4K, 15 um pixel, mercury-cadmium-telluride sensor with substrate removed for short-wavelength response and a 1.7 um cutoff will be used. Identical detector geometry and a nearly identical optical design allow for a common cryostat design with the only notable difference being the need for a cold radiation shield in the IR camera to mitigate thermal background. This paper describes the details of the cryostat design and cooling scheme, relevant thermal considerations and analysis, and discusses the detectors and detector readout electronics.

Original languageEnglish (US)
Title of host publicationGround-Based and Airborne Instrumentation for Astronomy IV
StatePublished - 2012
EventGround-Based and Airborne Instrumentation for Astronomy IV - Amsterdam, Netherlands
Duration: Jul 1 2012Jul 6 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherGround-Based and Airborne Instrumentation for Astronomy IV

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • CCD
  • Cryostat
  • H4RG
  • Infrared detector
  • Prime focus
  • Schmidt camera
  • Spectrograph


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