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  Geant4 simulation of the residual background in the ATHENA wide field imager from protons deflected by the charged particle diverter

Galgóczi, G., Breuer, J.-P., Fioretti, V., Zlámal, J., Werner, N., Čalkovský, V., et al. (2022). Geant4 simulation of the residual background in the ATHENA wide field imager from protons deflected by the charged particle diverter. In Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray. doi:10.1117/12.2629994.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000C-9F21-C Version Permalink: https://hdl.handle.net/21.11116/0000-000C-9F22-B
Genre: Conference Paper

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 Creators:
Galgóczi, Gábor, Author
Breuer, Jean-Paul, Author
Fioretti, Valentina, Author
Zlámal, Jakub, Author
Werner, Norbert, Author
Čalkovský, Vojtěch, Author
Boudin, Nathalie, Author
Ferreira, Ivo, Author
Guainazzi, Matteo, Author
Kienlin, Andreas von1, Author           
Lotti, Simone, Author
Mineo, Teresa, Author
Molendi, Silvano, Author
Perinati, Emanuele, Author
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: X-ray telescopes opened up a new window into the high-energy universe. However, the last generation of these telescopes encountered an unexpected problem: their optics focused not only x-rays but low-energy (so called soft) protons as well. These protons are very hard to model and can not be distinguished from x-rays. For example, 40% of XMM-Newton observations is significantly contaminated by soft proton induced background flares. In order to minimize the background from such low-energy protons the advanced telescope for high energy astrophysics (ATHENA) satellite introduced a novel concept, the so called charged particle diverter (CPD). It is an array of magnets in a Hallbach design, which deflects protons below 76 keV before they would hit the wide field imager (WFI) detector. In this work, we investigate the effect of scattering of the deflected protons with the CPD walls and the inner surfaces of the WFI detector assembly. Such scattered protons can loose energy, change direction and still hit the WFI. In order to adopt the most realistic instrument model, we imported the CAD model of both the CPD and the WFI focal plane assembly. Soft protons corresponding to ≈2.5 hours of exposure to the L1 solar wind are simulated in this work. The inhomogeneous magnetic field of the CPD is included in the simulation. We present a preliminary estimate of the WFI residual background induced by soft proton secondary scattering, in the case of the optical blocking filter present in the field of view. A first investigation of the volumes responsible for scattering the protons back into the field of view is reported.

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Language(s): eng - English
 Dates: 2022-08-31
 Publication Status: Published online
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 Identifiers: DOI: 10.1117/12.2629994
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Title: SPIE Astronomical Telescopes + Instrumentation,
Place of Event: Montréal, Québec, Canada
Start-/End Date: 2022-07-17 - 2022-07-23

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Title: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray
Source Genre: Proceedings
 Creator(s):
Nakazawa, Kazuhiro, Author
Nikzad, Shouleh , Author
A. den Herder, Jan-Willem , Author
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Publ. Info: -
Pages: - Volume / Issue: 12181 Sequence Number: - Start / End Page: - Identifier: -

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Title: Proceedings of SPIE
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Publ. Info: Bellingham, WA, USA : Society of Photo-Optical Instrumentation Engineers
Pages: - Volume / Issue: - Sequence Number: 1218140 Start / End Page: - Identifier: ISSN: 0277-786X