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ATHENA WFI optical blocking filters development status toward the end of the instrument phase-A
Author(s): Marco Barbera; Ugo Lo Cicero; Luisa Sciortino; Fabio D'Anca; Giancarlo Parodi; Miroslaw Rataj; Szymon Polak; Adam Pilch; Norbert Meidinger; Salvatore Sciortino; Gregor Rauw; Graziella Branduardi Raymont; Teresa Mineo; Emanuele Perinati; Paolo Giglio; Alfonso Collura; Salvatore Varisco; Roberto Candia
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Paper Abstract

The Wide Field Imager (WFI) is one of the two instruments of the ATHENA astrophysics space mission approved by ESA as the second large mission in the Cosmic Vision 2015-2025 Science Programme. The WFI, based on a large array of depleted field effect transistors (DEPFET), will provide imaging in the 0.2-15 keV band over a 40’x40’ field of view, simultaneously with spectrally and time resolved photon counting. The WFI detector is also sensitive to UV/Vis photons, with an electron-hole pair production efficiency in the UV/VIS larger than that for X-ray photons. Optically generated photo-electrons may degrade the spectral resolution as well as change the energy scale by introducing a signal offset. For this reason, the use of X-ray transparent optical blocking filters (OBFs) are needed to allow the observation of X-ray sources that present a UV/Vis bright counterpart. The OBFs design is challenging since one of the two required filters is quite large (~ 160 mm × 160 mm), very thin (< 200 nm), and shall survive the mechanical load during the launch. In this paper, we review the main results of modeling and characterization tests of OBF partially representative samples, performed during the phase A study, to identify the suitable materials, optimize the design, prove that the filters can be launched in atmospheric pressure, and thus demonstrate that the chosen technology can reach the proper technical readiness before mission adoption.

Paper Details

Date Published: 6 July 2018
PDF: 13 pages
Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106991K (6 July 2018); doi: 10.1117/12.2314448
Show Author Affiliations
Marco Barbera, Univ. degli Studi di Palermo (Italy)
Istituto Nazionale di Astrofisica (Italy)
Ugo Lo Cicero, INAF - Osservatorio Astronomico di Palermo Giuseppe S. Vaiana (Italy)
Univ. degli Studi di Palermo (Italy)
Luisa Sciortino, Univ. degli studi di Palermo (Italy)
Fabio D'Anca, Consiglio Nazionale delle Ricerche (Italy)
Giancarlo Parodi, BCV Progetti S.r.l. (Italy)
Miroslaw Rataj, Space Research Ctr. Polish Acadmey of Sciences (Poland)
Szymon Polak, Space Research Ctr. Polish Acadmey of Sciences (Poland)
Adam Pilch, AGH Univ. of Science and Technology (Poland)
Norbert Meidinger, Max-Planck-Institut für extraterrestrische Physik (Germany)
Salvatore Sciortino, INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
Gregor Rauw, Univ. de Liège (Belgium)
Graziella Branduardi Raymont, Univ. College London (United Kingdom)
Teresa Mineo, INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
Emanuele Perinati, Eberhard Karls Univ. Tübingen (Germany)
Paolo Giglio, Univ. degli Studi di Palermo (Italy)
Alfonso Collura, INAF - Osservatorio Astronomico di Palermo (Italy)
Salvatore Varisco, INAF - Osservatorio Astronomico di Palermo (Italy)
Roberto Candia, INAF - Osservatorio Astronomico di Palermo (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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