18 July 2016 Preliminary thermal architecture of the X-IFU instrument dewar
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The ESA Athena mission will implement 2 instruments to study the hot and energetic universe. The X-ray Integral Field Unit (X-IFU) will provide spatially resolved high resolution spectroscopy. This high energy resolution of 2.5 eV at 7 keV could be achieved thanks to TES (Transition Edge Sensor) detectors that need to be cooled to very low temperature. To obtain the required 50 mK temperature level, a careful design of the cryostat and of the cooling chain including different technologies in cascade is needed. The preliminary cryogenic architecture of the X-IFU instrument that fulfils the TES detector thermal requirements is described. In particular, the thermal design of the detector focal plane assembly (FPA), that uses three temperature stages (from 2 K to 50 mK) to limit the thermal loads on the lowest temperature stage, is described. The baseline cooling chain is based on European and Japanese mechanical coolers (Stirling, Pulse tube and Joule Thomson coolers) that precool a sub Kelvin cooler made of a 3He sorption cooler coupled with a small ADR (Adiabatic Demagnetization Refrigerator). Preliminary thermal budgets of the X-IFU cryostat are presented and discussed regarding cooling chain performances.
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Ivan Charles, Ivan Charles, Christophe Daniel, Christophe Daniel, Jérome André, Jérome André, Lionel Duband, Lionel Duband, Jean-Marc Duval, Jean-Marc Duval, Roland den Hartog, Roland den Hartog, Kazuhisa Mitsuda, Kazuhisa Mitsuda, Keisuke Shinozaki, Keisuke Shinozaki, Henk van Weers, Henk van Weers, Noriko Y. Yamasaki, Noriko Y. Yamasaki, "Preliminary thermal architecture of the X-IFU instrument dewar", Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99052J (18 July 2016); doi: 10.1117/12.2232710; https://doi.org/10.1117/12.2232710

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