Validation of Geant4 10.3 simulation of proton interaction for space radiation effects

Ivanchenko, V. N.; Dondero, P.; Fioretti, Alessandro; Ivantchenko, Anton; Lei, F.; Lotti, Simone; Mantero, A.; Mineo, T.

doi:10.1007/s10686-017-9556-z

Cited by 27 publications

(17 citation statements)

References 22 publications

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“…The energy loss due to electromagnetic interactions is calculated using the energy loss, range and inverse range tables pre-computed at initialization of Geant4 for each material [ 49 , 50 ]. In all Geant4 electromagnetic physics configurations, two models are used for proton ionization [ 51 ]: the PSTAR/SRIM stopping power [ 5 , 52 ] for proton energies below 2 MeV, and the Bethe–Bloch formula with shell, Barkas and Bloch, and density effect corrections [ 53 ] for energies above 2 MeV.…”

Section: Methodsmentioning

confidence: 99%

“…The energy loss due to electromagnetic interactions is calculated using the energy loss, range and inverse range tables pre-computed at initialization of Geant4 for each material [49,50]. In all Geant4 electromagnetic physics configurations, two models are used for proton ionization [51]: the PSTAR/ royalsocietypublishing.org/journal/rsos R. Soc.…”

Section: Monte Carlo Particle Transport Simulations Through the Solarmentioning

confidence: 99%

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Ab initio electronic stopping power for protons in Ga _0.5 In _0.5 P/GaAs/Ge triple-junction solar cells for space applications

2020

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Motivated by the radiation damage of solar panels in space, firstly, the results of Monte Carlo particle transport simulations are presented for proton impact on triple-junction Ga 0.5 In 0.5 P/GaAs/Ge solar cells, showing the proton projectile penetration in the cells as a function of energy. It is followed by a systematic ab initio investigation of the electronic stopping power (ESP) for protons in different layers of the cell at the relevant velocities via real-time time-dependent density functional theory calculations. The ESP is found to depend significantly on different channelling conditions, which should affect the low-velocity damage predictions, and which are understood in terms of impact parameter and electron density along the path. Additionally, we explore the effect of the interface between the layers of the multilayer structure on the energy loss of a proton, along with the effect of strain in the lattice-matched solar cell. Both effects are found to be small compared with the main bulk effect. The interface energy loss has been found to increase with decreasing proton velocity, and in one case, there is an effective interface energy gain.

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Section: Methodsmentioning

confidence: 99%

“…The energy loss due to electromagnetic interactions is calculated using the energy loss, range and inverse range tables pre-computed at initialization of Geant4 for each material [49,50]. In all Geant4 electromagnetic physics configurations, two models are used for proton ionization [51]: the PSTAR/ royalsocietypublishing.org/journal/rsos R. Soc.…”

Section: Monte Carlo Particle Transport Simulations Through the Solarmentioning

confidence: 99%

Ab initio electronic stopping power for protons in Ga _0.5 In _0.5 P/GaAs/Ge triple-junction solar cells for space applications

2020

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“…The material composition and the geometry of the individual elements were adopted from the blueprints and the latter was additionally verified by measurements wherever possible . The beam model was developed and validated using the reference hadron physics list and the electromagnetic option 4, EMZ . Details on the physics models employed can be found in the Geant4 Physics Reference Manual .…”

Section: Methodsmentioning

confidence: 99%

Evaluation of electromagnetic and nuclear scattering models in GATE/Geant4 for proton therapy

et al. 2019

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PurposeThe dose core of a proton pencil beam (PB) is enveloped by a low dose area reaching several centimeters off the central axis and containing a considerable amount of the dose. Adequate modeling of the different components of the PB profile is, therefore, required for accurate dose calculation. In this study, we experimentally validated one electromagnetic and two nuclear scattering models in GATE/Geant4 for dose calculation of proton beams in the therapeutic energy window (62–252 MeV) with and without range shifter (RaShi).MethodsThe multiple Coulomb scattering (MCS) model was validated by lateral dose core profiles measured for five energies at up to four depths from beam plateau to Bragg peak region. Nuclear halo profiles of single PBs were evaluated for three (62.4, 148.2, and 252.7 MeV) and two (97.4 and 124.7 MeV) energies, without and with RaShi, respectively. The influence of the dose core and nuclear halo on field sizes varying from 2–20 cm was evaluated by means of output factors (OFs), namely frame factors (FFs) and field size factors (FSFs), to quantify the relative increase of dose when increasing the field size.ResultsThe relative increase in the dose core width in the simulations deviated negligibly from measurements for depths until 80% of the beam range, but was overestimated by up to 0.2 mm in σ toward the end of range for all energies. The dose halo region of the lateral dose profile agreed well with measurements in the open beam configuration, but was notably overestimated in the deepest measurement plane of the highest energy or when the beam passed through the RaShi. The root‐mean‐square deviations (RMSDs) between the simulated and the measured FSFs were less than 1% at all depths, but were higher in the second half of the beam range as compared to the first half or when traversing the RaShi. The deviations in one of the two tested hadron physics lists originated mostly in elastic scattering. The RMSDs could be reduced by approximately a factor of two by exchanging the default elastic scattering cross sections for protons.ConclusionsGATE/Geant4 agreed satisfyingly with most measured quantities. MCS was systematically overestimated toward the end of the beam range. Contributions from nuclear scattering were overestimated when the beam traversed the RaShi or at the depths close to the end of the beam range without RaShi. Both, field size effects and calculation uncertainties, increased when the beam traversed the RaShi. Measured field size effects were almost negligible for beams up to medium energy and were highest for the highest energy beam without RaShi, but vice versa when traversing the RaShi.

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“…An effort has been made to adapt GEANT4 settings to space physics, for electromagnetic interactions a specialized physics list for space processes is used, developed in the AREMBES effort (for AREMBES GEANT4 validation see Refs. 14,15). GRAS 16 is a GEANT4-based tool that deals with common radiation analyses types in generic 3D models.…”

Section: Geant4/gras As Tools To Derive the In-flight Backgroundmentioning

confidence: 99%

Enhanced simulations on the ATHENA/WFI instrumental background

Eraerds

Antonelli

Davis

et al. 2020

Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray

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The Wide Field Imager (WFI) is one of two focal plane instruments of the Advanced Telescope for High-Energy Astrophysics (Athena), ESA's next large X-ray observatory, planned for launch in the early 2030's. The current baseline halo orbit is around L2, the first Lagrangian point of the Sun-Earth system, L1 is under consideration.For both potential halo orbits the radiation environment, solar and cosmic protons, electrons and He-ions will affect the performance of the instruments. A further critical contribution to the instrument background arises from the unfocused cosmic hard X-ray background. It is important to understand and estimate the expected instrumental background and to investigate measures, like design modifications or analysis methods, which could improve the expected background level in order to achieve the challenging scientific requirement (< 5 × 10 −3 cts/cm 2 /keV/s at 2 -7 keV). Previous WFI background simulations 1 done in Geant4 have been improved by taking into account new information about the proton flux at L2. In addition, the simulation model of the WFI instrument and its surroundings employed in GEANT4 simulations has been refined to follow the technological development of the WFI camera.

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Validation of Geant4 10.3 simulation of proton interaction for space radiation effects

Cited by 27 publications

References 22 publications

Ab initio electronic stopping power for protons in Ga _0.5 In _0.5 P/GaAs/Ge triple-junction solar cells for space applications

Ab initio electronic stopping power for protons in Ga _0.5 In _0.5 P/GaAs/Ge triple-junction solar cells for space applications

Evaluation of electromagnetic and nuclear scattering models in GATE/Geant4 for proton therapy

Enhanced simulations on the ATHENA/WFI instrumental background

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Validation of Geant4 10.3 simulation of proton interaction for space radiation effects

Cited by 27 publications

References 22 publications

Ab initio electronic stopping power for protons in Ga 0.5 In 0.5 P/GaAs/Ge triple-junction solar cells for space applications

Ab initio electronic stopping power for protons in Ga 0.5 In 0.5 P/GaAs/Ge triple-junction solar cells for space applications

Evaluation of electromagnetic and nuclear scattering models in GATE/Geant4 for proton therapy

Enhanced simulations on the ATHENA/WFI instrumental background

Contact Info

Product

Resources

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Ab initio electronic stopping power for protons in Ga _0.5 In _0.5 P/GaAs/Ge triple-junction solar cells for space applications

Ab initio electronic stopping power for protons in Ga _0.5 In _0.5 P/GaAs/Ge triple-junction solar cells for space applications