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Use G4SingleParticleSource instead of G4ParticleGun for isotope source generation. #508

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Merged
oschulz merged 2 commits into from
Jul 6, 2025
Merged

Use G4SingleParticleSource instead of G4ParticleGun for isotope source generation. #508

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eeb5aa4
Use `G4SingleParticleSource` instead of `G4ParticleGun` for isotope
Yuan-Ru-Lin Jul 4, 2025
07b3819
Add timing information
Yuan-Ru-Lin Jul 5, 2025
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15 changes: 7 additions & 8 deletions ext/Geant4/g4jl_application.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ function _processHits(step::G4Step, ::G4TouchableHistory, data::SDData{T})::Bool
# detno
detno = Int32(1), #step |> GetPostStepPoint |> GetPhysicalVolume, # get ID?
# thit
thit = T(0)*u"s", #step |> GetPostStepPoint |> GetGlobalTime,
thit = (step |> GetPostStepPoint |> GetGlobalTime) / Geant4.SystemOfUnits.nanosecond * u"ns",
# edep
edep = T(edep * 1000u"keV"),
# pos
Expand All @@ -53,7 +53,7 @@ end


@with_kw mutable struct GeneratorData <: G4JLGeneratorData
gun::Union{Nothing, CxxPtr{G4ParticleGun}} = nothing
gun::Union{Nothing, CxxPtr{G4ParticleGun}, CxxPtr{G4SingleParticleSource}} = nothing
particle::Union{Nothing, CxxPtr{G4ParticleDefinition}} = nothing
position::G4ThreeVector = G4ThreeVector(0, 0, 0)
direction::G4ThreeVector = G4ThreeVector(0, 0, 0)
Expand All @@ -79,9 +79,7 @@ function SSDGenerator(source::SolidStateDetectors.MonoenergeticSource; kwargs..
SetParticleEnergy(gun, ustrip(u"MeV", source.energy))
SetParticleDefinition(gun, particle)
end



function _gen(evt::G4Event, data::GeneratorData)::Nothing
if !iszero(source.opening_angle)
d::CartesianVector = normalize(source.direction)
Expand All @@ -105,15 +103,16 @@ function SSDGenerator(source::SolidStateDetectors.IsotopeSource; kwargs...)

data = GeneratorData(;kwargs...)
function _init(data::GeneratorData, ::Any)
gun = data.gun = move!(G4ParticleGun())
gun = data.gun = move!(G4SingleParticleSource())
data.position = G4ThreeVector(
source.position.x * Geant4.SystemOfUnits.meter,
source.position.y * Geant4.SystemOfUnits.meter,
source.position.z * Geant4.SystemOfUnits.meter
)
SetParticlePosition(gun, data.position)
data.direction = G4ThreeVector(source.direction.x, source.direction.y, source.direction.z)
SetParticleMomentumDirection(gun, data.direction)
SetParticleMomentumDirection(GetAngDist(gun), data.direction)
SetMonoEnergy(gun |> GetEneDist, 0.0 * Geant4.SystemOfUnits.MeV)
end

function _gen(evt::G4Event, data::GeneratorData)::Nothing
Expand All @@ -130,10 +129,10 @@ function SSDGenerator(source::SolidStateDetectors.IsotopeSource; kwargs...)
θ = acos(1 - (1 - cos(source.opening_angle))*rand())
v = (cos(θ) * d + sin(θ) * (cos(ϕ) * a + sin(ϕ) * b))
direction = G4ThreeVector(v.x, v.y, v.z)
SetParticleMomentumDirection(data.gun, direction)
SetParticleMomentumDirection(GetAngDist(data.gun), direction)
end
GeneratePrimaryVertex(data.gun, CxxPtr(evt))
end

G4JLPrimaryGenerator("SSDGenerator", data; init_method=_init, generate_method=_gen)
end
end
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