include/Geant4/G4ParticleHPArbitaryTab.hh

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0025 //
0026 //
0027 //
0028 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
0029 //
0030 #ifndef G4ParticleHPArbitaryTab_h
0031 #define G4ParticleHPArbitaryTab_h 1
0032
0033 #include "G4InterpolationManager.hh"
0034 #include "G4ParticleHPVector.hh"
0035 #include "G4VParticleHPEDis.hh"
0036 #include "G4ios.hh"
0037 #include "Randomize.hh"
0038 #include "globals.hh"
0039
0040 #include <CLHEP/Units/SystemOfUnits.h>
0041
0042 #include <fstream>
0043
0044 // we will need a List of these .... one per term.
0045
0046 class G4ParticleHPArbitaryTab : public G4VParticleHPEDis
0047 {
0048   public:
0049     G4ParticleHPArbitaryTab()
0050     {
0051       theDistFunc = nullptr;
0052       nDistFunc = 0;
0053     }
0054     ~G4ParticleHPArbitaryTab() override { delete[] theDistFunc; }
0055
0056     inline void Init(std::istream& theData) override
0057     {
0058       std::size_t i;
0059       theFractionalProb.Init(theData, CLHEP::eV);
0060       theData >> nDistFunc;  // = number of incoming n energy points
0061       const std::size_t dsize = nDistFunc > 0 ? nDistFunc : 1;
0062       theDistFunc = new G4ParticleHPVector[dsize];
0063       theManager.Init(theData);
0064       G4double currentEnergy;
0065       for (i = 0; i < dsize; ++i) {
0066         theData >> currentEnergy;
0067         theDistFunc[i].SetLabel(currentEnergy * CLHEP::eV);
0068         theDistFunc[i].Init(theData, CLHEP::eV);
0069         theDistFunc[i].IntegrateAndNormalise();
0070         //************************************************************************
0071         // EMendoza:
0072         // ThinOut() assumes that the data is linear-linear, what is false:
0073         // theDistFunc[i].ThinOut(0.02); // @@@ optimization to be finished.
0074         //************************************************************************
0075       }
0076
0077       //************************************************************************
0078       // EMendoza:
0079       // Here we calculate the thresholds for the 2D sampling:
0080       for (i = 0; i < dsize; ++i) {
0081         G4int np = theDistFunc[i].GetVectorLength();
0082         theLowThreshold[i] = theDistFunc[i].GetEnergy(0);
0083         theHighThreshold[i] = theDistFunc[i].GetEnergy(np - 1);
0084         for (G4int j = 0; j < np - 1; ++j) {
0085           if (theDistFunc[i].GetXsec(j + 1) > 1.e-20) {
0086             theLowThreshold[i] = theDistFunc[i].GetEnergy(j);
0087             break;
0088           }
0089         }
0090         for (G4int j = 1; j < np; ++j) {
0091           if (theDistFunc[i].GetXsec(j - 1) > 1.e-20) {
0092             theHighThreshold[i] = theDistFunc[i].GetEnergy(j);
0093           }
0094         }
0095       }
0096       //************************************************************************
0097     }
0098
0099     inline G4double GetFractionalProbability(G4double anEnergy) override
0100     {
0101       return theFractionalProb.GetY(anEnergy);
0102     }
0103
0104     G4double Sample(G4double anEnergy) override;
0105
0106   private:
0107     G4ParticleHPVector theFractionalProb;
0108     G4int nDistFunc;
0109     G4InterpolationManager theManager;  // knows the interpolation between stores
0110     G4ParticleHPVector* theDistFunc;  // one per incoming energy
0111     G4ParticleHPVector theBuffer;
0112     //************************************************************************
0113     // EMendoza:
0114     G4double theLowThreshold[1000];
0115     G4double theHighThreshold[1000];
0116     //************************************************************************
0117 };
0118
0119 #endif