source: trunk/source/processes/electromagnetic/lowenergy/src/G4DNAEmfietzoglouExcitationModel.cc @ 1347

Last change on this file since 1347 was 1347, checked in by garnier, 13 years ago

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26// $Id: G4DNAEmfietzoglouExcitationModel.cc,v 1.10 2010/06/08 21:50:00 sincerti Exp $
27// GEANT4 tag $Name: geant4-09-04-ref-00 $
28//
29
30#include "G4DNAEmfietzoglouExcitationModel.hh"
31
32//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
33
34using namespace std;
35
36//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
37
38G4DNAEmfietzoglouExcitationModel::G4DNAEmfietzoglouExcitationModel(const G4ParticleDefinition*,
39                                             const G4String& nam)
40:G4VEmModel(nam),isInitialised(false)
41{
42
43  lowEnergyLimit = 8.23 * eV; 
44  highEnergyLimit = 10 * MeV;
45  SetLowEnergyLimit(lowEnergyLimit);
46  SetHighEnergyLimit(highEnergyLimit);
47
48  nLevels = waterExcitation.NumberOfLevels();
49
50  verboseLevel= 0;
51  // Verbosity scale:
52  // 0 = nothing
53  // 1 = warning for energy non-conservation
54  // 2 = details of energy budget
55  // 3 = calculation of cross sections, file openings, sampling of atoms
56  // 4 = entering in methods
57 
58  if (verboseLevel > 3)
59
60  if( verboseLevel>0 ) 
61  { 
62    G4cout << "Emfietzoglou Excitation model is constructed " << G4endl
63           << "Energy range: "
64           << lowEnergyLimit / eV << " eV - "
65           << highEnergyLimit / MeV << " MeV"
66           << G4endl;
67  } 
68}
69
70//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
71
72G4DNAEmfietzoglouExcitationModel::~G4DNAEmfietzoglouExcitationModel()
73{}
74
75//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
76
77void G4DNAEmfietzoglouExcitationModel::Initialise(const G4ParticleDefinition* /*particle*/,
78                                       const G4DataVector& /*cuts*/)
79{
80
81  if (verboseLevel > 3)
82    G4cout << "Calling G4DNAEmfietzoglouExcitationModel::Initialise()" << G4endl;
83
84  // Energy limits
85 
86  if (LowEnergyLimit() < lowEnergyLimit)
87  {
88    G4cout << "G4DNAEmfietzoglouExcitationModel: low energy limit increased from " << 
89        LowEnergyLimit()/eV << " eV to " << lowEnergyLimit/eV << " eV" << G4endl;
90    SetLowEnergyLimit(lowEnergyLimit);
91    }
92
93  if (HighEnergyLimit() > highEnergyLimit)
94  {
95    G4cout << "G4DNAEmfietzoglouExcitationModel: high energy limit decreased from " << 
96        HighEnergyLimit()/MeV << " MeV to " << highEnergyLimit/MeV << " MeV" << G4endl;
97    SetHighEnergyLimit(highEnergyLimit);
98  }
99
100  //
101  if( verboseLevel>0 ) 
102  { 
103    G4cout << "Emfietzoglou Excitation model is initialized " << G4endl
104           << "Energy range: "
105           << LowEnergyLimit() / eV << " eV - "
106           << HighEnergyLimit() / MeV << " MeV"
107           << G4endl;
108  }
109
110  if(!isInitialised) 
111  {
112    isInitialised = true;
113 
114    if(pParticleChange)
115      fParticleChangeForGamma = reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
116    else
117      fParticleChangeForGamma = new G4ParticleChangeForGamma();
118  }   
119
120  // InitialiseElementSelectors(particle,cuts);
121
122}
123
124//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
125
126G4double G4DNAEmfietzoglouExcitationModel::CrossSectionPerVolume(const G4Material* material,
127                                           const G4ParticleDefinition* particleDefinition,
128                                           G4double ekin,
129                                           G4double,
130                                           G4double)
131{
132  if (verboseLevel > 3)
133    G4cout << "Calling CrossSectionPerVolume() of G4DNAEmfietzoglouExcitationModel" << G4endl;
134
135 // Calculate total cross section for model
136
137 G4double sigma=0;
138 
139 if (material->GetName() == "G4_WATER")
140 {
141
142  if (particleDefinition == G4Electron::ElectronDefinition())
143  {
144    if (ekin >= lowEnergyLimit && ekin < highEnergyLimit)
145    {
146      sigma = Sum(ekin);
147    }
148  }
149 
150  if (verboseLevel > 3)
151  {
152    G4cout << "---> Kinetic energy(eV)=" << ekin/eV << G4endl;
153    G4cout << " - Cross section per water molecule (cm^2)=" << sigma/cm/cm << G4endl;
154    G4cout << " - Cross section per water molecule (cm^-1)=" << sigma*material->GetAtomicNumDensityVector()[1]/(1./cm) << G4endl;
155  } 
156
157 } 
158       
159 return sigma*material->GetAtomicNumDensityVector()[1];           
160}
161
162//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
163
164void G4DNAEmfietzoglouExcitationModel::SampleSecondaries(std::vector<G4DynamicParticle*>* /*fvect*/,
165                                              const G4MaterialCutsCouple* /*couple*/,
166                                              const G4DynamicParticle* aDynamicElectron,
167                                              G4double,
168                                              G4double)
169{
170
171  if (verboseLevel > 3)
172    G4cout << "Calling SampleSecondaries() of G4DNAEmfietzoglouExcitationModel" << G4endl;
173
174  G4double electronEnergy0 = aDynamicElectron->GetKineticEnergy();
175 
176  G4int level = RandomSelect(electronEnergy0);
177
178  G4double excitationEnergy = waterExcitation.ExcitationEnergy(level);
179  G4double newEnergy = electronEnergy0 - excitationEnergy;
180 
181  if (electronEnergy0 < highEnergyLimit)
182  {
183    if (newEnergy >= lowEnergyLimit)
184    {
185      fParticleChangeForGamma->ProposeMomentumDirection(aDynamicElectron->GetMomentumDirection());
186      fParticleChangeForGamma->SetProposedKineticEnergy(newEnergy);
187      fParticleChangeForGamma->ProposeLocalEnergyDeposit(excitationEnergy);
188    }
189 
190    else   
191    {
192      fParticleChangeForGamma->ProposeTrackStatus(fStopAndKill);
193      fParticleChangeForGamma->ProposeLocalEnergyDeposit(electronEnergy0);
194    }
195  }
196}
197
198//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
199
200G4double G4DNAEmfietzoglouExcitationModel::PartialCrossSection(G4double t, G4int level)
201{
202  //                 Aj                        T
203  // Sigma(T) = ------------- (Bj /  T) ln(Cj ---) [1 - Bj / T]^Pj
204  //             2 pi alpha0                   R
205  //
206  // Sigma is the macroscopic cross section = N sigma, where N = number of target particles per unit volume
207  // and sigma is the microscopic cross section
208  // T      is the incoming electron kinetic energy
209  // alpha0 is the Bohr Radius (Bohr_radius)
210  // Aj, Bj, Cj & Pj are parameters that can be found in Emfietzoglou's papers
211  //
212  // From Phys. Med. Biol. 48 (2003) 2355-2371, D.Emfietzoglou,
213  // Monte Carlo Simulation of the energy loss of low energy electrons in liquid Water
214  //
215  // Scaling for macroscopic cross section: number of water moleculs per unit volume
216  // const G4double sigma0 = (10. / 3.343e22) * cm2;
217
218  const G4double density = 3.34192e+19 * mm3;
219
220  const G4double aj[]={0.0205, 0.0209, 0.0130, 0.0026, 0.0025};
221  const G4double cj[]={4.9801, 3.3850, 2.8095, 1.9242, 3.4624};
222  const G4double pj[]={0.4757, 0.3483, 0.4443, 0.3429, 0.4379};
223  const G4double r = 13.6 * eV;
224 
225  G4double sigma = 0.;
226 
227  G4double exc = waterExcitation.ExcitationEnergy(level);
228 
229  if (t >= exc)
230  {
231      G4double excitationSigma = ( aj[level] / (2.*pi*Bohr_radius)) 
232        * (exc / t) 
233        * std::log(cj[level]*(t/r)) 
234        * std::pow((1.- (exc/t)), pj[level]);
235      sigma = excitationSigma / density;
236  }
237
238  return sigma;
239}
240
241//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
242
243G4int G4DNAEmfietzoglouExcitationModel::RandomSelect(G4double k)
244{
245  G4int i = nLevels;
246  G4double value = 0.;
247  std::deque<double> values;
248 
249  while (i > 0)
250  {
251    i--;
252    G4double partial = PartialCrossSection(k,i);
253    values.push_front(partial);
254    value += partial;
255  }
256
257  value *= G4UniformRand();
258   
259  i = nLevels;
260
261  while (i > 0)
262  {
263    i--;
264    if (values[i] > value) return i;
265    value -= values[i];
266  }
267   
268  return 0;
269}
270
271//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
272
273G4double G4DNAEmfietzoglouExcitationModel::Sum(G4double k)
274{
275  G4double totalCrossSection = 0.;
276
277  for (G4int i=0; i<nLevels; i++)
278  {
279    totalCrossSection += PartialCrossSection(k,i);
280  }
281  return totalCrossSection;
282}
283
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