New cryogenic system of the next-generation infrared astronomy mission SPICA
2016
We present the new design of the cryogenic system of the next-generation infrared astronomy mission SPICA under the
new framework. The new design employs the V-groove design for radiators, making the best use of the Planck heritage.
The new design is based on the ESA-JAXA CDF study (NG-CryoIRTel, CDF-152(A)) with a 2 m telescope, and we
modified the CDF design to accommodate the 2.5 m telescope to meet the science requirements of SPICA. The basic
design concept of the SPICA cryogenic system is to cool the Science Instrument Assembly (SIA, which is the
combination of the telescope and focal-plane instruments) below 8K by the combination of the radiative cooling system
and mechanical cryocoolers without any cryogen.
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