18 July 2016 Temperature effects on the performances of the ATHENA X-IFU thermal filters
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The X-Ray Integral Field Unit (X-IFU) detector on-board ATHENA is an array of TES micro-calorimeters that will operate at ~50 mK. In the current investigated design, five thermal filters (TF) will be mounted on the cryostat shields to attenuate IR radiative load and avoid energy resolution degradation due to photon shot noise. Each filter consists of a thin polyimide film (~50 nm thick) coated with aluminum (~30 nm thick).

Since the TF operate at different temperatures in the range 0.05-300 K, it is relevant to study how temperature affects their mechanical/optical performances (e.g. near edge absorption fine structures of the atomic elements in the filter material). Such results are crucial for the proper design of the filters as well as to establish the calibration program operating temperatures.

We report the preliminary results of visual inspections performed on test filters of polyimide/Al at different pressure and temperature conditions, IR transmission measurements (1-15 μm) performed in the temperature range 10- 300 K, and X-ray Absorption Spectroscopy measurements (175-1650 eV) performed in the temperature range 130-300 K.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marco Barbera, Marco Barbera, Ugo Lo Cicero, Ugo Lo Cicero, Luisa Sciortino, Luisa Sciortino, Elena Magnano, Elena Magnano, Igor Píš, Igor Píš, Angela Ciaravella, Angela Ciaravella, Alfonso Collura, Alfonso Collura, Antonio Jimenez Escobar, Antonio Jimenez Escobar, Matteo Levantino, Matteo Levantino, Flavio Nuzzo, Flavio Nuzzo, } "Temperature effects on the performances of the ATHENA X-IFU thermal filters", Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 990560 (18 July 2016); doi: 10.1117/12.2232323; https://doi.org/10.1117/12.2232323

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