Hyper Suprime-Cam: Camera Dewar

摘要

We summarize the design of the camera dewar for Hyper Suprime-Cam (HSC) which is the next generation prime focus camera for Subaru Telescope. The camera dewar consists of six main components; base flange, focal plane assembly, window assembly, wall assembly, front-end electronics asembly and back assembly. It is about 700 mm in diameter and 500 mm in height, accommodating 116 2k×4k fully depleted CCDs inside. The CCD packages, whose heights are accurately controlled (P-V 25 μm), are installed on a silicon-carbide cold plate of 10 μm flatness to ensure that the surface of CCDs is flat within the focal depth of the wide-field corrector (～ 34μm). The cold plate is supported rigidly and thermally isolated by support posts which are made of Zirconia. We carried out, deformation analysis and thermal analysis of the dewar based on the finite-element analysis, and demonstrate that the design is feasible. We also show the assembly sequence of the dewar.