@inproceedings{bebf1a80d22b4d409a89359afe5a39f7,
title = "Assessment of the cosmic-ray impacts for LiteBIRD using Geant4 simulation",
abstract = "LiteBIRD is a space-borne experiment dedicated to detecting large-scale B-mode anisotropies of the linear polarization of the cosmic microwave background (CMB) predicted by the theory of inflation. It is planned to be launched in the late 2020s to the second Lagrangean point of the Sun-Earth system and map the sky in 15 frequency bands using thousands of transition edge sensor bolometers. LiteBIRD will be exposed to the cosmic-ray radiation throughout its lifetime, which may lead to the degradation of the scientific performance. Energy deposition by cosmic rays upon the focal plane bolometer detectors is considered a serious source of systematic effects. For a quantitative assessment of the effect, we present the result of Geant4 simulations to estimate the energy deposited by cosmic rays into the focal plane. We simulated different cosmic-ray components using CAD-based spacecraft models. We derive the spatial and energy distribution of the particles in the focal plane.",
keywords = "Galactic cosmic ray, Geant4, LiteBIRD, solar energetic particles, TES",
author = "{LiteBIRD collaboration} and Mayu Tominaga and Masahiro Tsujimoto and Hirokazu Ishino and Stever, {Samantha L.} and Serika Tsukatune",
note = "Funding Information: LiteBIRD (phase A) activities are supported by the following funding sources: ISAS/JAXA, MEXT, JSPS, KEK (Japan); CSA (Canada); CNES, CNRS, CEA (France); DFG (Germany); ASI, INFN, INAF (Italy); RCN (Norway); AEI (Spain); SNSA, SRC (Sweden); NASA, DOE (USA). This work was supported by JSPS KAKENHI Grant Number JP20K14497 and JSPS core-to-core program number JPJSCCA20200003. We acknowledge H. Takakura at the University of Tokyo and Y. Sakurai at Okayama University for providing the CAD files and Y. Funding Information: Further author information: (Send correspondence to M.Tominaga) M.Tominaga: E-mail: tominaga@ac.jaxa.jp Kavli IPMU is supported by World Premier International Research Center Initiative (WPI), MEXT, Japan. Publisher Copyright: {\textcopyright} 2022 SPIE.; Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave ; Conference date: 17-07-2022 Through 22-07-2022",
year = "2022",
doi = "10.1117/12.2629759",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Coyle, {Laura E.} and Shuji Matsuura and Perrin, {Marshall D.}",
booktitle = "Space Telescopes and Instrumentation 2022",
}