Import Geant4 7.0.0 source tree

2016-06-09 11:11:55 +02:00
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+//
+// ********************************************************************
+// * DISCLAIMER                                                       *
+// *                                                                  *
+// * The following disclaimer summarizes all the specific disclaimers *
+// * of contributors to this software. The specific disclaimers,which *
+// * govern, are listed with their locations in:                      *
+// *   http://cern.ch/geant4/license                                  *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.                                                             *
+// *                                                                  *
+// * This  code  implementation is the  intellectual property  of the *
+// * GEANT4 collaboration.                                            *
+// * By copying,  distributing  or modifying the Program (or any work *
+// * based  on  the Program)  you indicate  your  acceptance of  this *
+// * statement, and all its terms.                                    *
+// ********************************************************************
+//
+// $Id: G4SCProcessorStand.cc,v 1.2 2004/12/01 19:37:15 vnivanch Exp $
+// GEANT4 tag $Name: geant4-07-00-cand-03 $
+//
+// -------------------------------------------------------------------
+//
+// GEANT4 Class file
+//
+//
+// File name:     G4SCProcessorStand
+//
+// Author:        Vladimir Ivanchenko
+//
+// Creation date: 10.05.2002
+//
+// Modifications:
+//
+// 09-12-02 remove warning (V.Ivanchenko)
+// 23-12-02 change interface in order to move to cut per region (V.Ivanchenko)
+// 26-12-02 Secondary production moved to derived classes (V.Ivanchenko)
+// 27-01-03 Make models region aware (V.Ivanchenko)
+// 13-02-03 Add name (V.Ivanchenko)
+//
+//
+// -------------------------------------------------------------------
+//
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+#include "G4SCProcessorStand.hh"
+#include "G4Electron.hh"
+#include "G4Positron.hh"
+#include "G4Navigator.hh"
+#include "G4TransportationManager.hh"
+#include "G4EmModelManager.hh"
+#include "G4MaterialCutsCouple.hh"
+#include "G4VEmModel.hh"
+#include "Randomize.hh"
+#include "G4Step.hh"
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+using namespace std;
+
+G4SCProcessorStand::G4SCProcessorStand(const G4String& nam)
+  : G4VSubCutoffProcessor(nam),
+    theLambdaSubTable(0),
+    thePositron(G4Positron::Positron())
+{}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4SCProcessorStand::~G4SCProcessorStand()
+{}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+void G4SCProcessorStand::Initialise(const G4ParticleDefinition* p,
+                                    const G4ParticleDefinition* sp,
+                                    const G4DataVector* vCuts,
+                                    const G4DataVector* vSubCuts)
+{
+  particle = p;
+  secondaryParticle = sp;
+  navigator = (G4TransportationManager::GetTransportationManager())
+                                       ->GetNavigatorForTracking();
+  theCuts = vCuts;
+  theSubCuts = vSubCuts;
+  initialMass= particle->GetPDGMass();
+
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+vector<G4Track*>*  G4SCProcessorStand::SampleSecondaries(
+                    const G4Step&    step,
+			  G4double&  tmax,
+                          G4double&  meanLoss,
+                          G4VEmModel* currentModel)
+{
+  G4bool b;
+  const G4Track* track = step.GetTrack();
+  const G4MaterialCutsCouple* couple = track->GetMaterialCutsCouple();
+
+  size_t index = couple->GetIndex();
+  G4double subcut = (*theSubCuts)[index];
+
+  if(subcut >= tmax) return 0;
+
+  G4double cut = (*theCuts)[index];
+  G4double rcut   = couple->GetProductionCuts()->GetProductionCut(1);
+
+
+  const G4DynamicParticle* dp = track->GetDynamicParticle();
+  G4double ekin  = dp->GetKineticEnergy();
+  G4double effChargeFactor = 1.0;
+  G4double massRatio = 1.0;
+  G4double mass = initialMass;
+
+  if(dp->GetDefinition() != particle) {
+    mass = dp->GetMass();
+    massRatio = initialMass/mass;
+    G4double q = particle->GetPDGCharge()/dp->GetCharge();
+    effChargeFactor = q*q;
+  }
+
+  G4double cross = (*theLambdaSubTable)[index]->GetValue(ekin*massRatio, b);
+
+  if(0.0 >= cross) return 0;
+
+  G4StepPoint* pre = step.GetPreStepPoint();
+  G4double presafety  = pre->GetSafety();
+  G4ThreeVector postpoint = step.GetPostStepPoint()->GetPosition();
+  G4double postsafety = navigator->ComputeSafety(postpoint);
+  G4double safety = min(presafety,postsafety);
+  if(safety >= rcut) return 0;
+
+
+  G4ThreeVector prepoint = pre->GetPosition();
+  G4ThreeVector dr = postpoint - prepoint;
+  G4double pretime = step.GetPreStepPoint()->GetGlobalTime();
+  G4double fragment = 0.0;
+  G4double dt = 0.0;
+  G4double length = step.GetStepLength();
+  G4double inv_v = (ekin + mass)/(c_light*dp->GetTotalMomentum());
+
+  vector<G4Track*>* vtr = new vector<G4Track*>;
+
+  do {
+
+    G4double del = G4UniformRand()*effChargeFactor / cross;
+    fragment += del/length;
+    if (fragment > 1.0) break;
+
+    dt += del * inv_v;
+    vector<G4DynamicParticle*>* newp =
+           currentModel->SampleSecondaries(couple, dp, subcut, cut);
+    if (newp) {
+
+      G4DynamicParticle* p;
+      G4int nNew = newp->size();
+      for (G4int i=0; i<nNew; i++) {
+
+	p = (*newp)[i];
+        G4double e = p->GetKineticEnergy();
+        if (p->GetDefinition() == thePositron) e += electron_mass_c2;
+
+        if (e <= meanLoss) {
+          meanLoss  -= e;
+          G4Track* t = new G4Track(p, pretime + dt, prepoint + fragment*dr);
+          vtr->push_back(t);
+
+        } else {
+
+          delete p;
+        }
+      }
+    }
+  } while (fragment < 1.0);
+
+  return vtr;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+
+
+