Abstract
Diffuse X-ray Explorer is a proposed X-ray spectroscopic survey experiment for the China Space Station. Its detector assembly contains the transition edge sensor (TES) microcalorimeter and readout electronics based on the superconducting quantum interference device (SQUID) on the cold stage. The cold stage is thermally connected to the ADR stage, and a Kevlar suspension is used to stabilize and isolate it from the 4 K environment. TES and SQUID are both sensitive to the magnetic field, so a hybrid shielding structure consisting of an outer Cryoperm shield and an inner niobium shield is used to attenuate the magnetic field. In addition, IR/optical/UV photons can produce shot noise and thus degrade the energy resolution of the TES microcalorimeter. A blocking filter assembly is designed to minimize the effects. In it, five filters are mounted at different temperature stages, reducing the probability of IR/optical/UV photons reaching the detector through multiple reflections between filters and absorption. This paper will describe the preliminary design of the detector assembly and its optimization.
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http://www.cryopermshielding.com/cryoperm-shielding.php.
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Acknowledgements
We wish to thank Dr. Dan McCammon and all members of the DIXE collaboration team for useful discussion. This work was supported in part by the Ministry of Science and Technology of China through Grant 2022YFC2205100, by China National Space Administration (CNSA) through a technology development grant, and by the National Natural Science Foundation of China through Grants 11927805, 12203027, 11803014, and 12220101004.
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Liu, J., Wang, S., Jin, H. et al. Preliminary Design of Detector Assembly for DIXE. J Low Temp Phys (2024). https://doi.org/10.1007/s10909-024-03131-z
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DOI: https://doi.org/10.1007/s10909-024-03131-z