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Correction of the acollinearity sampling following Toussaint et al. #762

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Correction of the acollinearity sampling following Toussaint et al. #762

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9416e81
Adapt the correction suggested by Toussaint et al. (https://doi.org/1…
mraedler Apr 15, 2026
7502d71
Adding a command to set the "Mean Energy Per Ion Pair" value of a giv…
mraedler Jun 4, 2026
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4 changes: 3 additions & 1 deletion source/geometry/include/GateDetectorConstruction.hh
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Expand Up @@ -159,7 +159,8 @@ public:
void SetMaterialIoniPotential(G4String n,G4double v){theListOfIonisationPotential[n]=v;}
G4double GetMaterialIoniPotential(G4String n){ return theListOfIonisationPotential[n];}


void SetMaterialMeanEnergyPerIonPair(G4String n,G4double v){theListOfMeanEnergyPerIonPair[n]=v;}
G4double GetMaterialMeanEnergyPerIonPair(G4String n){ return theListOfMeanEnergyPerIonPair[n];}

private :

Expand All @@ -185,6 +186,7 @@ protected :
G4bool moveFlag;

std::map<G4String,G4double> theListOfIonisationPotential;
std::map<G4String,G4double> theListOfMeanEnergyPerIonPair;


private:
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1 change: 1 addition & 0 deletions source/geometry/include/GateDetectorMessenger.hh
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Expand Up @@ -58,6 +58,7 @@ class GateDetectorMessenger: public G4UImessenger

G4UIcmdWithoutParameter* pListCreatorsCmd;
G4UIcmdWithAString* IoniCmd;
G4UIcmdWithAString* IonPairCmd;

//G4UIcmdWithABool* pEnableAutoUpdateCmd;
//G4UIcmdWithABool* pDisableAutoUpdateCmd;
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16 changes: 16 additions & 0 deletions source/geometry/src/GateDetectorConstruction.cc
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Expand Up @@ -153,6 +153,22 @@ G4VPhysicalVolume* GateDetectorConstruction::Construct()

const G4MaterialTable * theTable = G4Material::GetMaterialTable();
for(unsigned int i =0;i<(*theTable).size();i++){
// Set the default value
G4double defaultMeanEnergyPerIonPair = 5. * eV;
(*theTable)[i]->GetIonisation()->SetMeanEnergyPerIonPair(defaultMeanEnergyPerIonPair);

// Update, if given
if(theListOfMeanEnergyPerIonPair[(*theTable)[i]->GetName()]){
(*theTable)[i]->GetIonisation()->SetMeanEnergyPerIonPair(theListOfMeanEnergyPerIonPair[(*theTable)[i]->GetName()]);
GateMessage("Physic", 1, " - " << (*theTable)[i]->GetName() << "\t updating the default 'mean energy per ion pair' value of " <<
G4BestUnit(defaultMeanEnergyPerIonPair,"Energy") << "to " <<
G4BestUnit((*theTable)[i]->GetIonisation()->GetMeanEnergyPerIonPair(),"Energy") << Gateendl);
}
else {
GateMessage("Physic", 1, " - " << (*theTable)[i]->GetName() << "\t using the default 'mean energy per ion pair' value of " <<
G4BestUnit((*theTable)[i]->GetIonisation()->GetMeanEnergyPerIonPair(),"Energy") << Gateendl);
}

if(theListOfIonisationPotential[(*theTable)[i]->GetName()]){
(*theTable)[i]->GetIonisation()->SetMeanExcitationEnergy(theListOfIonisationPotential[(*theTable)[i]->GetName()]);
GateMessage("Physic", 1, " - " << (*theTable)[i]->GetName() << "\t defaut value: I = " <<
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15 changes: 13 additions & 2 deletions source/geometry/src/GateDetectorMessenger.cc
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Expand Up @@ -171,8 +171,12 @@ GateDetectorMessenger::GateDetectorMessenger(GateDetectorConstruction* GateDet)
IoniCmd = new G4UIcmdWithAString(cmd,this);
IoniCmd->SetGuidance("Set the ionisation potential for a material (two parameters 'material' and 'value and unit')");



cmd = "/gate/geometry/setMeanEnergyPerIonPair";
IonPairCmd = new G4UIcmdWithAString(cmd,this);
IonPairCmd->SetGuidance("Set the mean energy per ion pair. "
"This controls the magnitude of the acollinearity effect for electron-positron annihilation. "
"The default value is 5 eV (see https://www.geant4.org/download/release-notes/notes-v10.7.0.html). "
"(two parameters 'material' and 'value with unit')");

GateDistributionListManager::Init();
}
Expand Down Expand Up @@ -245,6 +249,13 @@ void GateDetectorMessenger::SetNewValue(G4UIcommand* command, G4String newValue)
GetStringAndValueFromCommand(command, newValue, matName, value);
pDetectorConstruction->SetMaterialIoniPotential(matName,value);
}
else if( command == IonPairCmd )
{
G4String matName;
double value;
GetStringAndValueFromCommand(command, newValue, matName, value);
pDetectorConstruction->SetMaterialMeanEnergyPerIonPair(matName,value);
}
else
G4UImessenger::SetNewValue(command,newValue);

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21 changes: 15 additions & 6 deletions source/physics/src/GateBackToBack.cc
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Expand Up @@ -52,12 +52,21 @@ void GateBackToBack::GenerateVertex( G4Event* aEvent, G4bool accolinearityFlag)
if (accoValue == 0.0){
accoValue = 0.5*pi / 180;
}

G4double dev = CLHEP::RandGauss::shoot( 0.,accoValue / GateConstants::fwhm_to_sigma );
G4double Phi1 = ( twopi * G4UniformRand() )/2. ;

G4ThreeVector DirectionPhoton( sin( dev ) * cos( Phi1 ),
sin( dev ) * sin( Phi1 ), cos( dev ) );

// Adapt the correction suggested by Toussaint et al. (https://doi.org/10.1088/1361-6560/ad70f1)

// G4double dev = CLHEP::RandGauss::shoot( 0.,accoValue / GateConstants::fwhm_to_sigma );
// G4double Phi1 = ( twopi * G4UniformRand() )/2. ;
//
// G4ThreeVector DirectionPhoton( sin( dev ) * cos( Phi1 ),
// sin( dev ) * sin( Phi1 ), cos( dev ) );

G4double phi = CLHEP::RandGauss::shoot(0., accoValue / GateConstants::fwhm_to_sigma);
G4double psi = CLHEP::RandGauss::shoot(0., accoValue / GateConstants::fwhm_to_sigma);

G4double theta = sqrt(pow(phi, 2.0) + pow(psi, 2.0));

G4ThreeVector DirectionPhoton(sin(theta) * phi / theta, sin(theta) * psi / theta, cos(theta));

// Scale vector to unit length before rotation, re-scale to original length after rotation:
G4double gammaMom_mag = gammaMom.mag();
Expand Down
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