191 lines
7.2 KiB
C++
191 lines
7.2 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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/// \file SteppingAction.cc
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/// \brief Implementation of the SteppingAction class
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#include "SteppingAction.hh"
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#include "DetectorConstruction.hh"
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#include "HistoManager.hh"
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#include "RunAction.hh"
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#include "G4ParticleTypes.hh"
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#include "G4RunManager.hh"
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#include <G4RotationMatrix.hh>
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#include <G4ThreeVector.hh>
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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SteppingAction::SteppingAction(DetectorConstruction* det, RunAction* RuAct)
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: G4UserSteppingAction(), fDetector(det), fRunAction(RuAct)
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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SteppingAction::~SteppingAction() {}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void SteppingAction::UserSteppingAction(const G4Step* aStep)
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{
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G4StepPoint* prePoint = aStep->GetPreStepPoint();
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// if World --> return
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if (prePoint->GetTouchableHandle()->GetVolume() == fDetector->GetWorld()) return;
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// here we enter in the absorber Box
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// tag the event to be killed anyway after this step
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//
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G4RunManager::GetRunManager()->AbortEvent();
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// count processes and keep only Multiple Scattering or gamma converion
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//
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G4StepPoint* endPoint = aStep->GetPostStepPoint();
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G4String procName = endPoint->GetProcessDefinedStep()->GetProcessName();
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fRunAction->CountProcesses(procName);
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if (procName == "msc" || procName == "muMsc" || procName == "stepMax") {
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// below, only multiple Scattering happens
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//
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G4ThreeVector position = endPoint->GetPosition();
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G4ThreeVector direction = endPoint->GetMomentumDirection();
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G4double truePathLength = aStep->GetStepLength();
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G4double geomPathLength = position.x() + 0.5 * fDetector->GetBoxSize();
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G4double ratio = geomPathLength / truePathLength;
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fRunAction->SumPathLength(truePathLength, geomPathLength);
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G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
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analysisManager->FillH1(1, truePathLength);
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analysisManager->FillH1(2, geomPathLength);
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analysisManager->FillH1(3, ratio);
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G4double yend = position.y(), zend = position.z();
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G4double lateralDisplacement = std::sqrt(yend * yend + zend * zend);
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fRunAction->SumLateralDisplacement(lateralDisplacement);
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analysisManager->FillH1(4, lateralDisplacement);
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G4double psi = std::atan(lateralDisplacement / geomPathLength);
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fRunAction->SumPsi(psi);
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analysisManager->FillH1(5, psi);
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G4double xdir = direction.x(), ydir = direction.y(), zdir = direction.z();
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G4double tetaPlane = std::atan2(ydir, xdir);
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fRunAction->SumTetaPlane(tetaPlane);
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analysisManager->FillH1(6, tetaPlane);
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tetaPlane = std::atan2(zdir, xdir);
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fRunAction->SumTetaPlane(tetaPlane);
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analysisManager->FillH1(6, tetaPlane);
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G4double phiPos = std::atan2(zend, yend);
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analysisManager->FillH1(7, phiPos);
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G4double phiDir = std::atan2(zdir, ydir);
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analysisManager->FillH1(8, phiDir);
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G4double phiCorrel = 0.;
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if (lateralDisplacement > 0.) phiCorrel = (yend * ydir + zend * zdir) / lateralDisplacement;
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fRunAction->SumPhiCorrel(phiCorrel);
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analysisManager->FillH1(9, phiCorrel);
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}
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else if (procName == "conv" || procName == "GammaToMuPair") {
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// gamma conversion
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G4StepPoint* PrePoint = aStep->GetPreStepPoint();
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G4double EGamma = PrePoint->GetTotalEnergy();
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G4ThreeVector PGamma = PrePoint->GetMomentum();
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G4ThreeVector PolaGamma = PrePoint->GetPolarization();
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G4double Eplus = -1;
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G4ThreeVector Pplus, Pminus, Precoil;
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const G4TrackVector* secondary = fpSteppingManager->GetSecondary();
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const size_t Nsecondaries = (*secondary).size();
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// No conversion , E < threshold
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if (Nsecondaries == 0) return;
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for (size_t lp = 0; lp < std::min(Nsecondaries, size_t(2)); lp++) {
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if (((*secondary)[lp]->GetDefinition() == G4Electron::Definition())
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|| ((*secondary)[lp]->GetDefinition() == G4MuonMinus::Definition()))
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{
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Pminus = (*secondary)[lp]->GetMomentum();
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}
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if (((*secondary)[lp]->GetDefinition() == G4Positron::Definition())
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|| ((*secondary)[lp]->GetDefinition() == G4MuonPlus::Definition()))
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{
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Eplus = (*secondary)[lp]->GetTotalEnergy();
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Pplus = (*secondary)[lp]->GetMomentum();
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}
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}
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if (Nsecondaries >= 3) {
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Precoil = (*secondary)[2]->GetMomentum();
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}
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G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
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// Fill Histograms
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G4ThreeVector z = PGamma.unit(); // gamma direction
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G4ThreeVector x(1., 0., 0.);
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// pola perpendicular to direction
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if (PolaGamma.mag() != 0.0) {
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x = PolaGamma.unit();
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}
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else { // Pola = 0 case
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x = z.orthogonal().unit();
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}
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G4ThreeVector y = z;
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y = y.cross(x);
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G4RotationMatrix GtoW(x, y, z); // from gamma ref. sys. to World
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G4RotationMatrix WtoG = inverseOf(GtoW); // from World to gamma ref. sys.
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G4double angleE = Pplus.angle(Pminus) * EGamma;
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analysisManager->FillH1(10, angleE);
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if (Nsecondaries >= 3) {
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// recoil returned
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analysisManager->FillH1(11, std::log10(Precoil.mag()));
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analysisManager->FillH1(12, Precoil.transform(WtoG).phi());
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}
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G4double phiPlus = Pplus.transform(WtoG).phi();
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G4double phiMinus = Pminus.transform(WtoG).phi();
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analysisManager->FillH1(13, phiPlus);
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analysisManager->FillH1(14, std::cos(phiPlus + phiMinus) * -2.0);
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analysisManager->FillH1(15, Eplus / EGamma);
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G4double phiPola = PolaGamma.transform(WtoG).phi();
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analysisManager->FillH1(16, phiPola);
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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