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The optical blocking filter for the ATHENA Wide Field Imager: ongoing activities towards the conceptual design

Barbera, M; Branduardi-Raymont, G; Collura, A; Comastri, A; Eder, J; Kamisinski, T; Lo Cicero, U; ... Wawer, P; + view all (2015) The optical blocking filter for the ATHENA Wide Field Imager: ongoing activities towards the conceptual design. In: Siegmund, OH, (ed.) UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX. SPIE: San Diego, CA, USA. Green open access

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Abstract

ATHENA is the L2 mission selected by ESA to pursue the science theme “Hot and Energetic Universe” (launch scheduled in 2028). One of the key instruments of ATHENA is the Wide Field Imager (WFI) which will provide imaging in the 0.1-15 keV band over a 40’x40’ large field of view, together with spectrally and time-resolved photon counting. The WFI camera, based on arrays of DEPFET active pixel sensors, is also sensitive to UV/Vis photons. Optically generated electron-hole pairs may degrade the spectral resolution as well as change the energy scale by introducing a signal offset. For this reason, the use of an X-ray transparent optical blocking filter is needed to allow the observation of all type of X-ray sources that present a UV/Visible bright counterpart. In this paper, we describe the main activities that we are carrying on for the conceptual design of the optical blocking filter, that will be mounted on the filter wheel, in order to satisfy the scientific requirements on optical load from bright UV/Vis astrophysical source, to maximize the X-ray transmission, and to withstand the severe acoustic and vibration loads foreseen during launch.

Type: Proceedings paper
Title: The optical blocking filter for the ATHENA Wide Field Imager: ongoing activities towards the conceptual design
Event: SPIE Optical Engineering + Applications
Location: San Diego, CA
Dates: 09 August 2015 - 10 August 2015
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2189326
Publisher version: http://dx.doi.org/10.1117/12.2189326
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1537402
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