9 August 2016 Visible camera cryostat design and performance for the SuMIRe Prime Focus Spectrograph (PFS)
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Abstract
We describe the design and performance of the SuMIRe Prime Focus Spectrograph (PFS) visible camera cryostats. SuMIRe PFS is a massively multi-plexed ground-based spectrograph consisting of four identical spectrograph modules, each receiving roughly 600 fibers from a 2394 fiber robotic positioner at the prime focus. Each spectrograph module has three channels covering wavelength ranges 380 nm - 640 nm, 640 nm - 955 nm, and 955 nm - 1.26 um, with the dispersed light being imaged in each channel by a f/1.07 vacuum Schmidt camera. The cameras are very large, having a clear aperture of 300 mm at the entrance window, and a mass of ~280 kg. In this paper we describe the design of the visible camera cryostats and discuss various aspects of cryostat performance.
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Stephen A. Smee, James E. Gunn, Mirek Golebiowski, Stephen C. Hope, Fabrice Madec, Jean-Francois Gabriel, Craig Loomis, Arnaud Le fur, Kjetil Dohlen, David Le Mignant, Robert Barkhouser, Michael Carr, Murdock Hart, Naoyuki Tamura, Atsushi Shimono, Naruhisa Takato, "Visible camera cryostat design and performance for the SuMIRe Prime Focus Spectrograph (PFS)", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99088Y (9 August 2016); doi: 10.1117/12.2233185; https://doi.org/10.1117/12.2233185
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