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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Modelling magnetised medium particle transport in the guiding centre limit with GEANT4

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Tuneu, J. [1] ; Gimenez de Castro, G. [2, 1] ; Szpigel, S. [1] ; MacKinnon, A. [3]
Total Authors: 4
[1] Univ Presbiteriana Mackenzie, Ctr Radio Astron & Astrofis Mackenzie, Sao Paulo - Brazil
[2] CONICET UBA, Inst Astron & Fis Espacio, Buenos Aires, DF - Argentina
[3] Univ Glasgow, Sch Phys & Astron, Glasgow, Lanark - Scotland
Total Affiliations: 3
Document type: Journal article
Source: Astronomy & Astrophysics; v. 654, OCT 15 2021.
Web of Science Citations: 0

Monte Carlo codes are a standard tool for studying energetic particle propagation, secondary production, and radiation in astrophysical settings. In magnetised plasmas such as those found in solar active regions, the enormous disparity between particle gyroradii and system scales proves to be a major computational obstacle. To address this problem we have written a new module in Geant4 using the guiding centre (GC) approach in which the particle motion is averaged over a gyrofrequency. We describe the formulation and implementation of this method in particular dealing with the uncertainty in gyrophase so that particle velocities are well-defined for input to the modules handling reactions. As far as feasible, we compare the propagation and slowing down of primary protons, secondary particle production, and run times in the GC limit with the Newton-Lorentz approach, finding very good agreement between the two methods and orders of magnitude improvement in run times in the GC case. Finally, we present an illustrative solar physics application involving two interacting dipoles, which is only achievable using the GC approach. (AU)

FAPESP's process: 16/23428-4 - Monte Carlo simulations of nuclear processes during solar flares in magneto-active plasmas
Grantee:Jordi Tuneu Serra
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 18/08180-1 - Geant4 simulations of nuclear processes in a magneto-active plasma during solar flares
Grantee:Jordi Tuneu Serra
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 13/24155-3 - Solar flare diagnostic in an unprecedented frequency range from microwaves to THz frequencies: challenges for interpretation (flat)
Grantee:Carlos Guillermo Giménez de Castro
Support Opportunities: Research Projects - Thematic Grants