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25 //
26 // neutron_hp -- source file
27 // J.P. Wellisch, Nov-1996
28 // A prototype of the low energy neutron transport model.
29 //
30 // 070523 add neglecting doppler broadening on the fly. T. Koi
31 // 070613 fix memory leaking by T. Koi
32 // 071002 enable cross section dump by T. Koi
33 // 080428 change checking point of "neglecting doppler broadening" flag
34 // from GetCrossSection to BuildPhysicsTable by T. Koi
35 // 081024 G4NucleiPropertiesTable:: to G4NucleiProperties::
36 //
37 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
38 //
39 #include "G4ParticleHPElasticData.hh"
40
41 #include "G4Electron.hh"
42 #include "G4ElementTable.hh"
43 #include "G4HadronicParameters.hh"
44 #include "G4Neutron.hh"
45 #include "G4NucleiProperties.hh"
46 #include "G4Nucleus.hh"
47 #include "G4ParticleHPData.hh"
48 #include "G4ParticleHPManager.hh"
49 #include "G4PhysicalConstants.hh"
50 #include "G4Pow.hh"
51 #include "G4SystemOfUnits.hh"
52
53 G4ParticleHPElasticData::G4ParticleHPElasticData() : G4VCrossSectionDataSet("NeutronHPElasticXS")
54 {
55 SetMinKinEnergy(0 * MeV);
56 SetMaxKinEnergy(20 * MeV);
57
58 theCrossSections = nullptr;
59 instanceOfWorker = false;
60 if (G4Threading::IsWorkerThread()) {
61 instanceOfWorker = true;
62 }
63 element_cache = nullptr;
64 material_cache = nullptr;
65 ke_cache = 0.0;
66 xs_cache = 0.0;
67 // BuildPhysicsTable( *G4Neutron::Neutron() );
68 }
69
70 G4ParticleHPElasticData::~G4ParticleHPElasticData()
71 {
72 if (theCrossSections != nullptr && !instanceOfWorker) {
73 theCrossSections->clearAndDestroy();
74 delete theCrossSections;
75 theCrossSections = nullptr;
76 }
77 }
78
79 G4bool G4ParticleHPElasticData::IsIsoApplicable(const G4DynamicParticle* dp, G4int /*Z*/,
80 G4int /*A*/, const G4Element* /*elm*/,
81 const G4Material* /*mat*/)
82 {
83 G4double eKin = dp->GetKineticEnergy();
84 return eKin <= GetMaxKinEnergy() && eKin >= GetMinKinEnergy()
85 && dp->GetDefinition() == G4Neutron::Neutron();
86 }
87
88 G4double G4ParticleHPElasticData::GetIsoCrossSection(const G4DynamicParticle* dp, G4int /*Z*/,
89 G4int /*A*/, const G4Isotope* /*iso*/,
90 const G4Element* element,
91 const G4Material* material)
92 {
93 if (dp->GetKineticEnergy() == ke_cache && element == element_cache && material == material_cache)
94 return xs_cache;
95
96 ke_cache = dp->GetKineticEnergy();
97 element_cache = element;
98 material_cache = material;
99 G4double xs = GetCrossSection(dp, element, material->GetTemperature());
100 xs_cache = xs;
101 return xs;
102 }
103
104 void G4ParticleHPElasticData::BuildPhysicsTable(const G4ParticleDefinition& aP)
105 {
106 if (&aP != G4Neutron::Neutron())
107 throw G4HadronicException(__FILE__, __LINE__,
108 "Attempt to use NeutronHP data for particles other than neutrons!!!");
109
110 if (G4Threading::IsWorkerThread()) {
111 theCrossSections = G4ParticleHPManager::GetInstance()->GetElasticCrossSections();
112 return;
113 }
114
115 std::size_t numberOfElements = G4Element::GetNumberOfElements();
116 // TKDB
117 // if ( theCrossSections == 0 ) theCrossSections = new G4PhysicsTable( numberOfElements );
118 if (theCrossSections == nullptr)
119 theCrossSections = new G4PhysicsTable(numberOfElements);
120 else
121 theCrossSections->clearAndDestroy();
122
123 // make a PhysicsVector for each element
124
125 auto theElementTable = G4Element::GetElementTable();
126 for (std::size_t i = 0; i < numberOfElements; ++i) {
127 G4PhysicsVector* physVec = G4ParticleHPData::Instance(G4Neutron::Neutron())
128 ->MakePhysicsVector((*theElementTable)[i], this);
129 theCrossSections->push_back(physVec);
130 }
131
132 G4ParticleHPManager::GetInstance()->RegisterElasticCrossSections(theCrossSections);
133 }
134
135 void G4ParticleHPElasticData::DumpPhysicsTable(const G4ParticleDefinition&)
136 {
137 #ifdef G4VERBOSE
138 if (G4HadronicParameters::Instance()->GetVerboseLevel() == 0) return;
139
140 //
141 // Dump element based cross section
142 // range 10e-5 eV to 20 MeV
143 // 10 point per decade
144 // in barn
145 //
146
147 G4cout << G4endl;
148 G4cout << G4endl;
149 G4cout << "Elastic Cross Section of Neutron HP" << G4endl;
150 G4cout << "(Pointwise cross-section at 0 Kelvin.)" << G4endl;
151 G4cout << G4endl;
152 G4cout << "Name of Element" << G4endl;
153 G4cout << "Energy[eV] XS[barn]" << G4endl;
154 G4cout << G4endl;
155
156 std::size_t numberOfElements = G4Element::GetNumberOfElements();
157 auto theElementTable = G4Element::GetElementTable();
158
159 for (std::size_t i = 0; i < numberOfElements; ++i) {
160 G4cout << (*theElementTable)[i]->GetName() << G4endl;
161 G4int ie = 0;
162
163 for (ie = 0; ie < 130; ++ie) {
164 G4double eKinetic = 1.0e-5 * G4Pow::GetInstance()->powA(10.0, ie / 10.0) * eV;
165 G4bool outOfRange = false;
166
167 if (eKinetic < 20 * MeV) {
168 G4cout << eKinetic / eV << " "
169 << (*((*theCrossSections)(i))).GetValue(eKinetic, outOfRange) / barn << G4endl;
170 }
171 }
172 G4cout << G4endl;
173 }
174 #endif
175 }
176
177 G4double G4ParticleHPElasticData::GetCrossSection(const G4DynamicParticle* aP, const G4Element* anE,
178 G4double aT)
179 {
180 G4double result = 0;
181 G4bool outOfRange;
182 auto index = (G4int)anE->GetIndex();
183
184 // prepare neutron
185 G4double eKinetic = aP->GetKineticEnergy();
186
187 if (G4ParticleHPManager::GetInstance()->GetNeglectDoppler()) {
188 // NEGLECT_DOPPLER_B.
189 G4double factor = 1.0;
190 if (eKinetic < aT * k_Boltzmann) {
191 // below 0.1 eV neutrons
192 // Have to do some, but now just igonre.
193 // Will take care after performance check.
194 // factor = factor * targetV;
195 }
196 return ((*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange)) * factor;
197 }
198
199 G4ReactionProduct theNeutron(aP->GetDefinition());
200 theNeutron.SetMomentum(aP->GetMomentum());
201 theNeutron.SetKineticEnergy(eKinetic);
202
203 // prepare thermal nucleus
204 G4Nucleus aNuc;
205 G4double eps = 0.0001;
206 G4double theA = anE->GetN();
207 G4double theZ = anE->GetZ();
208 G4double eleMass;
209
210 eleMass = (G4NucleiProperties::GetNuclearMass(G4int(theA + eps), G4int(theZ + eps)))
211 / G4Neutron::Neutron()->GetPDGMass();
212
213 G4ReactionProduct boosted;
214 G4double aXsection;
215
216 // MC integration loop
217 G4int counter = 0;
218 G4double buffer = 0;
219 G4int size = G4int(std::max(10., aT / 60 * kelvin));
220 G4ThreeVector neutronVelocity =
221 1. / G4Neutron::Neutron()->GetPDGMass() * theNeutron.GetMomentum();
222 G4double neutronVMag = neutronVelocity.mag();
223
224 while (counter == 0
225 || std::abs(buffer - result / std::max(1, counter))
226 > 0.03 * buffer) // Loop checking, 11.05.2015, T. Koi
227 {
228 if (counter != 0) buffer = result / counter;
229 while (counter < size) // Loop checking, 11.05.2015, T. Koi
230 {
231 counter++;
232 G4ReactionProduct aThermalNuc = aNuc.GetThermalNucleus(eleMass, aT);
233 boosted.Lorentz(theNeutron, aThermalNuc);
234 G4double theEkin = boosted.GetKineticEnergy();
235 aXsection = (*((*theCrossSections)(index))).GetValue(theEkin, outOfRange);
236 // velocity correction.
237 G4ThreeVector targetVelocity = 1. / aThermalNuc.GetMass() * aThermalNuc.GetMomentum();
238 aXsection *= (targetVelocity - neutronVelocity).mag() / neutronVMag;
239 result += aXsection;
240 }
241 size += size;
242 }
243 result /= counter;
244 /*
245 // Checking impact of G4NEUTRONHP_NEGLECT_DOPPLER
246 G4cout << " result " << result << " "
247 << (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) << " "
248 << (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) /result << G4endl;
249 */
250 return result;
251 }
252
253 G4int G4ParticleHPElasticData::GetVerboseLevel() const
254 {
255 return G4ParticleHPManager::GetInstance()->GetVerboseLevel();
256 }
257
258 void G4ParticleHPElasticData::SetVerboseLevel(G4int newValue)
259 {
260 G4ParticleHPManager::GetInstance()->SetVerboseLevel(newValue);
261 }
262
263 void G4ParticleHPElasticData::CrossSectionDescription(std::ostream& outFile) const
264 {
265 outFile << "High Precision cross data based on Evaluated Nuclear Data Files (ENDF) for elastic "
266 "reaction of neutrons below 20MeV\n";
267 }
268