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

D 2022

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

GALGÓCZI, Gábor; Jean-Paul Bernhard RIFFALD SOUZA BREUER; Valentina FIORETTI; Jakub ZLÁMAL; Norbert WERNER et al.

Základní údaje

Originální název

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

Autoři

Vydání

Washington, Proceedings of SPIE, Volume 12181: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray, od s. 1-9, 9 s. 2022

Nakladatel

SPIE

Další údaje

Jazyk

angličtina

Typ výsledku

Stať ve sborníku

Obor

10308 Astronomy

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Forma vydání

elektronická verze "online"

Odkazy

URL, URL

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/22:00127120

Organizační jednotka

Přírodovědecká fakulta

ISBN

978-1-5106-5343-6

ISSN

Klíčová slova anglicky

ATHENA; X-ray; soft proton scattering; Geant4; residual background

Štítky

14312040, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 19. 1. 2023 16:43, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

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.

Návaznosti

EF19_073/0016943, projekt VaV

Název: Interní grantová agentura Masarykovy univerzity

GX21-13491X, projekt VaV

Název: Zkoumání žhavého vesmíru a porozumění kosmické zpětné vazbě (Akronym: EHU)

Investor: Grantová agentura ČR, Exploring the Hot Universe and Understanding Comic Feedback

MUNI/I/0003/2020, interní kód MU

Název: MUNI Award in Science and Humanities 3 (Akronym: Space-Based High-Energy Astrophysics)

Investor: Masarykova univerzita, MUNI Award in Science and Humanities 3, MASH - MUNI Award in Science and Humanities

Citovat

GALGÓCZI, Gábor; Jean-Paul Bernhard RIFFALD SOUZA BREUER; Valentina FIORETTI; Jakub ZLÁMAL; Norbert WERNER; Vojtěch ČALKOVSKÝ; Nathalie BOUDIN; Ivo FERREIRA; Matteo GUAINAZZI; Andreas VON KIENLIN; Simone LOTTI; Teresa MINEO; Silvano MOLENDI a Emanuele PERINATI. Geant4 simulation of the residual background in the ATHENA wide field imager from protons deflected by the charged particle diverter. Online. In Jan-Willem A. den Herder, Shouleh Nikzad, Kazuhiro Nakazawa. Proceedings of SPIE, Volume 12181: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray. Washington: SPIE, 2022, s. 1-9. ISBN 978-1-5106-5343-6. Dostupné z: https://doi.org/10.1117/12.2629994.

@inproceedings{2230685,
   author = {Galgóczi, Gábor and Riffald Souza Breuer, JeanandPaul Bernhard and Fioretti, Valentina and Zlámal, Jakub and Werner, Norbert and Čalkovský, Vojtěch 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 = {https://doi.org/10.1117/12.2629994},
   editor = {Jan-Willem A. den Herder, Shouleh Nikzad, Kazuhiro Nakazawa},
   keywords = {ATHENA; X-ray; soft proton scattering; Geant4; residual background},
   howpublished = {elektronická verze "online"},
   language = {eng},
   location = {Washington},
   isbn = {978-1-5106-5343-6},
   pages = {1-9},
   publisher = {SPIE},
   title = {Geant4 simulation of the residual background in the ATHENA wide field imager from protons deflected by the charged particle diverter},
   url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12181/2629994/Geant4-simulation-of-the-residual-background-in-the-ATHENA-wide/10.1117/12.2629994.short},
   year = {2022}
}

TY  - CONF
ID  - 2230685
AU  - Galgóczi, Gábor - Riffald Souza Breuer, Jean-Paul Bernhard - Fioretti, Valentina - Zlámal, Jakub - Werner, Norbert - Čalkovský, Vojtěch - Boudin, Nathalie - Ferreira, Ivo - Guainazzi, Matteo - von Kienlin, Andreas - Lotti, Simone - Mineo, Teresa - Molendi, Silvano - Perinati, Emanuele
PY  - 2022
TI  - Geant4 simulation of the residual background in the ATHENA wide field imager from protons deflected by the charged particle diverter
PB  - SPIE
CY  - Washington
SN  - 9781510653436
KW  - ATHENA
KW  - X-ray
KW  - soft proton scattering
KW  - Geant4
KW  - residual background
UR  - https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12181/2629994/Geant4-simulation-of-the-residual-background-in-the-ATHENA-wide/10.1117/12.2629994.short
N2  - 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.
ER  -

GALGÓCZI, Gábor; Jean-Paul Bernhard RIFFALD SOUZA BREUER; Valentina FIORETTI; Jakub ZLÁMAL; Norbert WERNER; Vojtěch ČALKOVSKÝ; Nathalie BOUDIN; Ivo FERREIRA; Matteo GUAINAZZI; Andreas VON KIENLIN; Simone LOTTI; Teresa MINEO; Silvano MOLENDI a Emanuele PERINATI. Geant4 simulation of the residual background in the ATHENA wide field imager from protons deflected by the charged particle diverter. 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, s.~1-9. ISBN~978-1-5106-5343-6. Dostupné z: https://doi.org/10.1117/12.2629994.

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