5 October 2012 Hyper Suprime-Cam: conceptual design to introduce spectroscopic mode
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Abstract
Hyper Suprime-Cam (HSC) is the wide-field CCD camera which is attached to the prime focus of Subaru Telescope. It covers the field of view of 1.5 degree in diameter by 116 2k x 4k fully-depleted CCDs. In this paper, we present the conceptual design of optics and mechanics how to introduce spectroscopic mode to this simple imager HSC. The design is based on the idea that the optical elements such as collimeter, grisms and camera lenses are integrated as a ’filter’ of HSC. The incident light is folded by pickup mirror at filter layer and introduced to the filter space. After passing the slit, the incident light is collimated by the collimeter lens and divided into three wavelength ranges by dichroic mirrors. The collimated beam in each wavelength range is fed to the grism and dispersed. The dispersed beam is converged by the camera lens and folded by 45 degree mirror to the direction parallel to the optical axis. The resultant spectra are imaged on the main CCDs on the focal plane. The space allowed for filters is 600 mm in diameter and 42 mm thick, which is very tight but we are able to design spectroscopic optics with some difficulties. The spectral resolution is designed to be more than 1000 and the wavelength coverage is targeted to be 370–1050 nm to realize medium-resolution spectroscopy for various type of objects. We show the optical design of collimeter, grism and camera lenses together with the mechanical layout of the spectroscopic optics.
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Yutaka Komiyama, Yutaka Komiyama, Yoko Tanaka, Yoko Tanaka, Satoshi Miyazaki, Satoshi Miyazaki, Satoshi Kawanomoto, Satoshi Kawanomoto, Yukiko Kamata, Yukiko Kamata, Hidehiko Nakaya, Hidehiko Nakaya, Yoshiyuki Obuchi, Yoshiyuki Obuchi, Fumihiro Uraguchi, Fumihiro Uraguchi, Yousuke Utsumi, Yousuke Utsumi, } "Hyper Suprime-Cam: conceptual design to introduce spectroscopic mode", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84465D (5 October 2012); doi: 10.1117/12.926976; https://doi.org/10.1117/12.926976
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