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@inproceedings{2217759,
author = {Riffald Souza Breuer, JeanandPaul Bernhard and Galgóczi, Gábor and Fioretti, Valentina and Zlámal, Jakub and Liska, Petr and Werner, Norbert and Santin, Giovanni and Boudin, Nathalie and Ferreira, Ivo and Guainazzi, Matteo and von Kienlin, Andreas and Lotti, Simone and Mineo, Teresa and Molendi, Silvano and Perinati, Emanuele},
address = {Washington},
booktitle = {Proceedings of SPIE, Volume 12181: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray},
doi = {http://dx.doi.org/10.1117/12.2630076},
editor = {Jan-Willem A. den Herder, Shouleh Nikzad, Kazuhiro Nakazawa},
keywords = {Geant4; Particle Scattering; Proton simulations; Scanning Probe Microscopy; Surface Roughness},
howpublished = {elektronická verze "online"},
language = {eng},
location = {Washington},
isbn = {978-1-5106-5343-6},
pages = {1-12},
publisher = {SPIE},
title = {Athena charged particle diverter simulations: effects of micro-roughness on proton scattering using Geant4},
url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12181/2630076/Athena-charged-particle-diverter-simulations--effects-of-micro-roughness/10.1117/12.2630076.short},
year = {2022}
}
TY - JOUR
ID - 2217759
AU - Riffald Souza Breuer, Jean-Paul Bernhard - Galgóczi, Gábor - Fioretti, Valentina - Zlámal, Jakub - Liska, Petr - Werner, Norbert - Santin, Giovanni - Boudin, Nathalie - Ferreira, Ivo - Guainazzi, Matteo - von Kienlin, Andreas - Lotti, Simone - Mineo, Teresa - Molendi, Silvano - Perinati, Emanuele
PY - 2022
TI - Athena charged particle diverter simulations: effects of micro-roughness on proton scattering using Geant4
PB - SPIE
CY - Washington
SN - 9781510653436
KW - Geant4
KW - Particle Scattering
KW - Proton simulations
KW - Scanning Probe Microscopy
KW - Surface Roughness
UR - https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12181/2630076/Athena-charged-particle-diverter-simulations--effects-of-micro-roughness/10.1117/12.2630076.short
N2 - The last generation of X-ray focusing telescopes operating outside the Earth's radiation belt discovered that optics were able to focus not only astrophysical X-ray photons, but also low-energy heliophysical protons entering the Field of View (FOV). This "soft proton" contamination affects around 40\% of the observation time of XMM-Newton. The ATHENA Charged Particle Diverter (CPD) was designed to use magnetic fields to move these soft protons away from the FOV of the detectors, separating the background-contributing ions in the focused beam from the photons of interest. These magnetically deflected protons can hit other parts of the payload and scatter back to the focal plane instruments. Evaluating the impact of this secondary scattering with accurate simulations is essential for the CPD scientific assessment. However, while Geant4 simulations of grazing soft proton scattering on X-ray mirrors have been recently validated, the scattering on the unpolished surfaces of the payload (e.g. the baffle or the diverter itself) is still to be verified with experimental results. Moreover, the roughness structure can affect the energy and angle of the scattered protons, with a scattering efficiency depending on the specific target volume. Using Atomic Force Microscopy to take nanometer-scale surface roughness measurements from different materials and coating samples, we use Geant4 together with the CADMesh library to shoot protons at these very detailed surface roughness models to understand the effects of different material surface roughnesses, coatings, and compositions on proton energy deposition and scattering angles. We compare and validate the simulation results with laboratory experiments, and propose a framework for future proton scattering experiments.
ER -
RIFFALD SOUZA BREUER, Jean-Paul Bernhard, Gábor GALGÓCZI, Valentina FIORETTI, Jakub ZLÁMAL, Petr LISKA, Norbert WERNER, Giovanni SANTIN, Nathalie BOUDIN, Ivo FERREIRA, Matteo GUAINAZZI, Andreas VON KIENLIN, Simone LOTTI, Teresa MINEO, Silvano MOLENDI and Emanuele PERINATI. Athena charged particle diverter simulations: effects of micro-roughness on proton scattering using Geant4. Online. In Jan-Willem A. den Herder, Shouleh Nikzad, Kazuhiro Nakazawa. \textit{Proceedings of SPIE, Volume 12181: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray}. Washington: SPIE, 2022, p.~1-12. ISBN~978-1-5106-5343-6. Available from: https://dx.doi.org/10.1117/12.2630076.
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