Kavli Affiliate: Naoyuki Tamura
| First 5 Authors: Stephen A. Smee, James E. Gunn, Mirek Golebiowski, Stephen C. Hope, Fabrice Madec
| Summary:
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 $sim$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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