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Proceedings Paper

Thermal modelling of the ATHENA X-IFU filters
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Paper Abstract

The X-IFU instrument of the ATHENA mission requires a set of thermal filters to reduce the photon shot noise onto its cryogenic detector and to protect it from molecular contamination. A set of five filters, operating at different nominal temperatures corresponding to the cryostat shield temperatures, is currently baselined. The knowledge of the actual filter temperature profiles is crucial to have a good estimation of the radiative load on the detector. Furthermore, a few filters may need to be warmed-up to remove contaminants and it is necessary to ensure that a threshold temperature is reached throughout the filters surface. For these reasons, it is fundamental to develop a thermal modeling of the full set of filters in a representative configuration. The baseline filter is a polyimide membrane 45 nm thick coated with 30 nm of highpurity aluminum, mechanically supported by a metallic honeycomb mesh. In this paper, we describe the implemented thermal modeling and report the results obtained in different studies: (i) a trade-off analysis on how to reach a minimum target temperature throughout the outer filter, (ii) a thermal analysis when varying the emissivity of the filter surfaces, and (iii) the effect of removing one of the filters.

Paper Details

Date Published: 6 July 2018
PDF: 10 pages
Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 1069950 (6 July 2018); doi: 10.1117/12.2314453
Show Author Affiliations
Luisa Sciortino, Univ. degli studi di Palermo (Italy)
Ugo Lo Cicero, INAF - Osservatorio Astronomico di Palermo Giuseppe S. Vaiana (Italy)
Univ. degli Studi di Palermo (Italy)
Salvatore Ferruggia Bonura, Univ. degli Studi di Palermo (Italy)
Istituto Nazionale di Astrofisica - INAF (Italy)
Fabio D'Anca, Consiglio Nazionale delle Ricerche (Italy)
Antonino Buttacavoli, Istituto Nazionale di Astrofisica - INAF (Italy)
Elena Puccio, Istituto Nazionale di Astrofisica (Italy)
Marco Barbera, Univ. degli Studi di Palermo (Italy)
Istituto Nazionale di Astrofisica - INAF (Italy)

Published in SPIE Proceedings Vol. 10699:
Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Shouleh Nikzad; Kazuhiro Nakazawa, Editor(s)

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