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G4ParticleHPSimpleEvapSpectrum.hh
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27 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
28 //
29 #ifndef G4ParticleHPSimpleEvapSpectrum_h
30 #define G4ParticleHPSimpleEvapSpectrum_h 1
31 
32 #include <fstream>
34 
35 #include "globals.hh"
36 #include "G4ios.hh"
37 #include "Randomize.hh"
38 #include "G4Exp.hh"
39 #include "G4Log.hh"
40 #include "G4ParticleHPVector.hh"
41 #include "G4VParticleHPEDis.hh"
42 
43 // we will need a List of these .... one per term.
44 
46 {
47  public:
49  {
50  expm1 = G4Exp(-1.);
51  }
53  {
54  }
55 
56  inline void Init(std::istream & aDataFile)
57  {
58  theFractionalProb.Init(aDataFile, CLHEP::eV);
59  theThetaDist.Init(aDataFile, CLHEP::eV);
60  }
61 
63  {
64  return theFractionalProb.GetY(anEnergy);
65  }
66 
67  inline G4double Sample(G4double anEnergy)
68  {
69  G4double theta = theThetaDist.GetY(anEnergy)*CLHEP::eV;
70  G4double random, cut, max, result;
71  max = 10.*theta;
72  G4int icounter=0;
73  G4int icounter_max=1024;
74  do
75  {
76  icounter++;
77  if ( icounter > icounter_max ) {
78  G4cout << "Loop-counter exceeded the threshold value at " << __LINE__ << "th line of " << __FILE__ << "." << G4endl;
79  break;
80  }
81  random = G4UniformRand();
82  result = -theta*G4Log(random);
83  cut = G4UniformRand();
84  }
85  while(cut>result/max); // Loop checking, 11.05.2015, T. Koi
86  return result;
87  }
88 
89  private:
90 
91  inline G4double Evapo(G4double anEnergy, G4double theta)
92  {
93  G4double result = (anEnergy*CLHEP::eV)*G4Exp(-anEnergy*CLHEP::eV/theta);
94  return result;
95  }
96 
97  private:
98 
99  G4double expm1;
100 
101  G4ParticleHPVector theFractionalProb;
102 
103  G4ParticleHPVector theThetaDist;
104 
105 };
106 
107 #endif
G4double G4ParticleHPJENDLHEData::G4double result
int G4int
Definition: G4Types.hh:78
G4double GetFractionalProbability(G4double anEnergy)
void Init(std::istream &aDataFile, G4int total, G4double ux=1., G4double uy=1.)
#define G4UniformRand()
Definition: Randomize.hh:97
G4GLOB_DLL std::ostream G4cout
G4double GetY(G4double x)
static constexpr double eV
G4double G4Log(G4double x)
Definition: G4Log.hh:230
G4double G4Exp(G4double initial_x)
Exponential Function double precision.
Definition: G4Exp.hh:183
T max(const T t1, const T t2)
brief Return the largest of the two arguments
#define G4endl
Definition: G4ios.hh:61
double G4double
Definition: G4Types.hh:76