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

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dc.contributor.authorTuneu J.
dc.contributor.authorDe Castro G.G.
dc.contributor.authorSzpigel S.
dc.contributor.authorMackinnon A.
dc.date.accessioned2024-03-12T19:18:55Z
dc.date.available2024-03-12T19:18:55Z
dc.date.issued2021
dc.description.abstract© ESO 2021.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.
dc.description.volume654
dc.identifier.doi10.1051/0004-6361/202141183
dc.identifier.issn1432-0746
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/34575
dc.relation.ispartofAstronomy and Astrophysics
dc.rightsAcesso Aberto
dc.subject.otherlanguageAstroparticle physics
dc.subject.otherlanguageMethods: numerical
dc.subject.otherlanguageSun: flares
dc.subject.otherlanguageSun: magnetic fields
dc.subject.otherlanguageSun: particle emission
dc.titleModelling magnetised medium particle transport in the guiding centre limit with GEANT4
dc.typeArtigo
local.scopus.citations0
local.scopus.eid2-s2.0-85117389447
local.scopus.subjectAstroparticle physics
local.scopus.subjectGuiding centers
local.scopus.subjectMethod: numerical
local.scopus.subjectMonte Carlo codes
local.scopus.subjectParticle transport
local.scopus.subjectRuntimes
local.scopus.subjectStandard tools
local.scopus.subjectSun: particle emissions
local.scopus.subjectSun:flares
local.scopus.subjectSun:magnetic fields
local.scopus.updated2024-12-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85117389447&origin=inward
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