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27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class file 29 // GEANT4 Class file
30 // 30 //
31 // 31 //
32 // File name: G4Generator2BN 32 // File name: G4Generator2BN
33 // 33 //
34 // Author: Andreia Trindade (andreia@li 34 // Author: Andreia Trindade (andreia@lip.pt)
35 // Pedro Rodrigues (psilva@lip 35 // Pedro Rodrigues (psilva@lip.pt)
36 // Luis Peralta (luis@lip.p 36 // Luis Peralta (luis@lip.pt)
37 // 37 //
38 // Creation date: 21 June 2003 38 // Creation date: 21 June 2003
39 // 39 //
40 // Modifications: 40 // Modifications:
41 // 21 Jun 2003 41 // 21 Jun 2003 First implementation acording with new design
42 // 05 Nov 2003 MGP 42 // 05 Nov 2003 MGP Fixed compilation warning
43 // 14 Mar 2004 43 // 14 Mar 2004 Code optimization
44 // 44 //
45 // Class Description: 45 // Class Description:
46 // 46 //
47 // Concrete base class for Bremsstrahlung Angu 47 // Concrete base class for Bremsstrahlung Angular Distribution Generation
48 // 2BN Distribution 48 // 2BN Distribution
49 // 49 //
50 // Class Description: End 50 // Class Description: End
51 // 51 //
52 // ------------------------------------------- 52 // -------------------------------------------------------------------
53 // 53 //
54 54
55 #include "G4Generator2BN.hh" 55 #include "G4Generator2BN.hh"
56 #include "Randomize.hh" 56 #include "Randomize.hh"
57 #include "G4PhysicalConstants.hh" 57 #include "G4PhysicalConstants.hh"
58 #include "G4SystemOfUnits.hh" 58 #include "G4SystemOfUnits.hh"
59 #include "G4Exp.hh" 59 #include "G4Exp.hh"
60 60
61 // 61 //
62 62
63 G4double G4Generator2BN::Atab[320] = 63 G4double G4Generator2BN::Atab[320] =
64 { 0.0264767, 0.0260006, 0.0257112, 0. 64 { 0.0264767, 0.0260006, 0.0257112, 0.0252475, 0.024792, 0.0243443, 0.0240726, 0.0236367,
65 0.023209, 0.0227892, 0.0225362, 0. 65 0.023209, 0.0227892, 0.0225362, 0.0221284, 0.0217282,0.0214894, 0.0211005, 0.0207189,
66 0.0204935, 0.0201227, 0.0197588, 0. 66 0.0204935, 0.0201227, 0.0197588, 0.019546, 0.0191923,0.0188454, 0.0186445, 0.0183072,
67 0.0179763, 0.0177866, 0.0174649, 0. 67 0.0179763, 0.0177866, 0.0174649, 0.0172828, 0.0169702,0.0166634, 0.0164915, 0.0161933,
68 0.0160283, 0.0157384, 0.0155801, 0. 68 0.0160283, 0.0157384, 0.0155801, 0.0152981, 0.0151463,0.0148721, 0.0147263, 0.0144598,
69 0.01432, 0.0140607, 0.0139267, 0. 69 0.01432, 0.0140607, 0.0139267, 0.0136744, 0.0135459,0.0133005, 0.0131773, 0.0129385,
70 0.0128205, 0.0125881, 0.012475, 0. 70 0.0128205, 0.0125881, 0.012475, 0.0122488, 0.0121406,0.0119204, 0.0118167, 0.0117158,
71 0.0115032, 0.0114067, 0.0111995, 0. 71 0.0115032, 0.0114067, 0.0111995, 0.0111072, 0.0110175,0.0108173, 0.0107316, 0.0105365,
72 0.0104547, 0.0102646, 0.0101865, 0. 72 0.0104547, 0.0102646, 0.0101865, 0.010111, 0.00992684,0.0098548,0.00967532,0.00960671,
73 0.00943171,0.00936643,0.00930328,0. 73 0.00943171,0.00936643,0.00930328,0.0091337, 0.00907372,0.00890831,0.00885141,0.00869003,
74 0.00863611,0.00858428,0.00842757,0. 74 0.00863611,0.00858428,0.00842757,0.00837854,0.0082256,0.00817931,0.00803,0.00798639,
75 0.00784058,0.00779958,0.00776046,0. 75 0.00784058,0.00779958,0.00776046,0.00761866,0.00758201,0.00744346,0.00740928,0.00727384,
76 0.00724201,0.00710969,0.00708004,0. 76 0.00724201,0.00710969,0.00708004,0.00695074,0.00692333,0.00679688,0.00677166,0.00664801,
77 0.00662484,0.00650396,0.00648286,0. 77 0.00662484,0.00650396,0.00648286,0.00636458,0.00634545,0.00622977,0.00621258,0.00609936,
78 0.00608412,0.00597331,0.00595991,0. 78 0.00608412,0.00597331,0.00595991,0.00585143,0.00583988,0.0057337,0.0057239,0.00561991,
79 0.0056119, 0.00551005,0.00550377,0. 79 0.0056119, 0.00551005,0.00550377,0.00540399,0.00539938,0.00530162,0.00529872,0.00520292,
80 0.0051091, 0.00510777,0.00501582,0. 80 0.0051091, 0.00510777,0.00501582,0.00501608,0.00492594,0.00492781,0.00483942,0.0048429,
81 0.00475622,0.00476127,0.00467625,0. 81 0.00475622,0.00476127,0.00467625,0.00468287,0.00459947,0.00451785,0.00452581,0.00444573,
82 0.00445522,0.00437664,0.00438768,0. 82 0.00445522,0.00437664,0.00438768,0.00431057,0.00432316,0.00424745,0.0042616,0.00418726,
83 0.004203, 0.00413, 0.00405869,0. 83 0.004203, 0.00413, 0.00405869,0.00407563,0.00400561,0.00402414,0.00395536,0.00397553,
84 0.00390795,0.00392975,0.00386339,0. 84 0.00390795,0.00392975,0.00386339,0.00379862,0.00382167,0.00375805,0.00378276,0.00372031,
85 0.00374678,0.00368538,0.00371363,0. 85 0.00374678,0.00368538,0.00371363,0.00365335,0.00359463,0.0036242, 0.00356653,0.003598,
86 0.00354139,0.00357481,0.00351921,0. 86 0.00354139,0.00357481,0.00351921,0.00355464,0.00350005,0.0034471,0.00348403,0.00343208,
87 0.0034712, 0.00342026,0.00346165,0. 87 0.0034712, 0.00342026,0.00346165,0.00341172,0.00345548,0.00340657,0.00335944,0.00340491,
88 0.00335885,0.00340692,0.00336191,0. 88 0.00335885,0.00340692,0.00336191,0.00341273,0.00336879,0.00342249,0.00337962,0.00333889,
89 0.00339463,0.00335506,0.00341401,0. 89 0.00339463,0.00335506,0.00341401,0.00337558,0.00343797,0.00340067,0.00336584,0.00343059,
90 0.0033969, 0.00346557,0.00343302,0. 90 0.0033969, 0.00346557,0.00343302,0.00350594,0.00347448,0.00344563,0.00352163,0.00349383,
91 0.00357485,0.00354807,0.00352395,0. 91 0.00357485,0.00354807,0.00352395,0.00360885,0.00358571,0.00367661,0.00365446,0.00375194,
92 0.00373078,0.00371234,0.00381532,0. 92 0.00373078,0.00371234,0.00381532,0.00379787,0.00390882,0.00389241,0.00387881,0.00399675,
93 0.00398425,0.00411183,0.00410042,0. 93 0.00398425,0.00411183,0.00410042,0.00409197,0.00422843,0.00422123,0.00436974,0.0043637,
94 0.00436082,0.00452075,0.00451934,0. 94 0.00436082,0.00452075,0.00451934,0.00452125,0.00469406,0.00469756,0.00488741,0.00489221,
95 0.00490102,0.00510782,0.00511801,0. 95 0.00490102,0.00510782,0.00511801,0.00513271,0.0053589, 0.00537524,0.00562643,0.00564452,
96 0.0056677, 0.00594482,0.00596999,0. 96 0.0056677, 0.00594482,0.00596999,0.0059999, 0.00630758,0.00634014,0.00637849,0.00672136,
97 0.00676236,0.00680914,0.00719407,0. 97 0.00676236,0.00680914,0.00719407,0.0072439, 0.00730063,0.0077349, 0.00779494,0.00786293,
98 0.00835577,0.0084276, 0.00850759,0. 98 0.00835577,0.0084276, 0.00850759,0.00907162,0.00915592,0.00924925,0.00935226,0.00999779,
99 0.0101059, 0.0102249, 0.0109763, 0. 99 0.0101059, 0.0102249, 0.0109763, 0.0111003, 0.0112367, 0.0113862, 0.0122637, 0.0124196,
100 0.0125898, 0.0136311, 0.0138081, 0. 100 0.0125898, 0.0136311, 0.0138081, 0.0140011, 0.0142112, 0.0154536, 0.0156723, 0.0159099,
101 0.016168, 0.0176664, 0.0179339, 0. 101 0.016168, 0.0176664, 0.0179339, 0.0182246, 0.0185396, 0.020381, 0.0207026, 0.0210558,
102 0.0214374, 0.0237377, 0.0241275, 0. 102 0.0214374, 0.0237377, 0.0241275, 0.0245528, 0.0250106, 0.0255038, 0.0284158, 0.0289213,
103 0.0294621, 0.0300526, 0.0338619, 0. 103 0.0294621, 0.0300526, 0.0338619, 0.0344537, 0.0351108, 0.0358099, 0.036554, 0.0416399
104 }; 104 };
105 105
106 G4double G4Generator2BN::ctab[320] = 106 G4double G4Generator2BN::ctab[320] =
107 { 0.482253, 0.482253, 0.489021, 0.489021, 107 { 0.482253, 0.482253, 0.489021, 0.489021, 0.489021, 0.489021, 0.495933,
108 0.495933, 0.495933, 0.495933, 0.502993, 108 0.495933, 0.495933, 0.495933, 0.502993, 0.502993, 0.502993, 0.510204,
109 0.510204, 0.510204, 0.517572, 0.517572, 109 0.510204, 0.510204, 0.517572, 0.517572, 0.517572, 0.5251, 0.5251,
110 0.5251, 0.532793, 0.532793, 0.532793, 110 0.5251, 0.532793, 0.532793, 0.532793, 0.540657, 0.540657, 0.548697,
111 0.548697, 0.548697, 0.556917, 0.556917, 111 0.548697, 0.548697, 0.556917, 0.556917, 0.565323, 0.565323, 0.573921,
112 0.573921, 0.582717, 0.582717, 0.591716, 112 0.573921, 0.582717, 0.582717, 0.591716, 0.591716, 0.600925, 0.600925,
113 0.610352, 0.610352, 0.620001, 0.620001, 113 0.610352, 0.610352, 0.620001, 0.620001, 0.629882, 0.629882, 0.64,
114 0.64, 0.650364, 0.650364, 0.660982, 114 0.64, 0.650364, 0.650364, 0.660982, 0.660982, 0.671862, 0.683013,
115 0.683013, 0.694444, 0.694444, 0.706165, 115 0.683013, 0.694444, 0.694444, 0.706165, 0.718184, 0.718184, 0.730514,
116 0.730514, 0.743163, 0.743163, 0.756144, 116 0.730514, 0.743163, 0.743163, 0.756144, 0.769468, 0.769468, 0.783147,
117 0.783147, 0.797194, 0.797194, 0.811622, 117 0.783147, 0.797194, 0.797194, 0.811622, 0.826446, 0.826446, 0.84168,
118 0.84168, 0.857339, 0.857339, 0.873439, 118 0.84168, 0.857339, 0.857339, 0.873439, 0.889996, 0.889996, 0.907029,
119 0.907029, 0.924556, 0.924556, 0.942596, 119 0.907029, 0.924556, 0.924556, 0.942596, 0.942596, 0.961169, 0.980296,
120 0.980296, 1, 1, 1.0203, 120 0.980296, 1, 1, 1.0203, 1.0203, 1.04123, 1.04123,
121 1.06281, 1.06281, 1.08507, 1.08507, 121 1.06281, 1.06281, 1.08507, 1.08507, 1.10803, 1.10803, 1.13173,
122 1.13173, 1.1562, 1.1562, 1.18147, 122 1.13173, 1.1562, 1.1562, 1.18147, 1.18147, 1.20758, 1.20758,
123 1.23457, 1.23457, 1.26247, 1.26247, 123 1.23457, 1.23457, 1.26247, 1.26247, 1.29132, 1.29132, 1.32118,
124 1.32118, 1.35208, 1.35208, 1.38408, 124 1.32118, 1.35208, 1.35208, 1.38408, 1.38408, 1.41723, 1.41723,
125 1.45159, 1.45159, 1.45159, 1.48721, 125 1.45159, 1.45159, 1.45159, 1.48721, 1.48721, 1.52416, 1.52416,
126 1.5625, 1.5625, 1.60231, 1.60231, 126 1.5625, 1.5625, 1.60231, 1.60231, 1.64366, 1.64366, 1.68663,
127 1.68663, 1.68663, 1.7313, 1.7313, 127 1.68663, 1.68663, 1.7313, 1.7313, 1.77778, 1.77778, 1.82615,
128 1.82615, 1.87652, 1.87652, 1.92901, 128 1.82615, 1.87652, 1.87652, 1.92901, 1.92901, 1.98373, 1.98373,
129 1.98373, 2.04082, 2.04082, 2.1004, 129 1.98373, 2.04082, 2.04082, 2.1004, 2.1004, 2.16263, 2.16263,
130 2.22767, 2.22767, 2.22767, 2.29568, 130 2.22767, 2.22767, 2.22767, 2.29568, 2.29568, 2.36686, 2.36686,
131 2.44141, 2.44141, 2.51953, 2.51953, 131 2.44141, 2.44141, 2.51953, 2.51953, 2.51953, 2.60146, 2.60146,
132 2.68745, 2.68745, 2.77778, 2.77778, 132 2.68745, 2.68745, 2.77778, 2.77778, 2.87274, 2.87274, 2.87274,
133 2.97265, 2.97265, 3.07787, 3.07787, 133 2.97265, 2.97265, 3.07787, 3.07787, 3.18878, 3.18878, 3.30579,
134 3.30579, 3.30579, 3.42936, 3.42936, 134 3.30579, 3.30579, 3.42936, 3.42936, 3.55999, 3.55999, 3.69822,
135 3.69822, 3.84468, 3.84468, 3.84468, 135 3.69822, 3.84468, 3.84468, 3.84468, 4, 4, 4.16493,
136 4.16493, 4.34028, 4.34028, 4.34028, 136 4.16493, 4.34028, 4.34028, 4.34028, 4.52694, 4.52694, 4.7259,
137 4.7259, 4.93827, 4.93827, 4.93827, 137 4.7259, 4.93827, 4.93827, 4.93827, 5.16529, 5.16529, 5.40833,
138 5.40833, 5.40833, 5.66893, 5.66893, 138 5.40833, 5.40833, 5.66893, 5.66893, 5.94884, 5.94884, 6.25,
139 6.25, 6.25, 6.57462, 6.57462, 139 6.25, 6.25, 6.57462, 6.57462, 6.92521, 6.92521, 6.92521,
140 7.3046, 7.3046, 7.71605, 7.71605, 140 7.3046, 7.3046, 7.71605, 7.71605, 7.71605, 8.16327, 8.16327,
141 8.65052, 8.65052, 8.65052, 9.18274, 141 8.65052, 8.65052, 8.65052, 9.18274, 9.18274, 9.18274, 9.76562,
142 9.76562, 10.4058, 10.4058, 10.4058, 142 9.76562, 10.4058, 10.4058, 10.4058, 11.1111, 11.1111, 11.1111,
143 11.8906, 11.8906, 12.7551, 12.7551, 143 11.8906, 11.8906, 12.7551, 12.7551, 12.7551, 13.7174, 13.7174,
144 13.7174, 14.7929, 14.7929, 14.7929, 144 13.7174, 14.7929, 14.7929, 14.7929, 16, 16, 16,
145 17.3611, 17.3611, 17.3611, 18.9036, 145 17.3611, 17.3611, 17.3611, 18.9036, 18.9036, 18.9036, 20.6612,
146 20.6612, 20.6612, 22.6757, 22.6757, 146 20.6612, 20.6612, 22.6757, 22.6757, 22.6757, 22.6757, 25,
147 25, 25, 27.7008, 27.7008, 147 25, 25, 27.7008, 27.7008, 27.7008, 27.7008, 30.8642,
148 30.8642, 30.8642, 34.6021, 34.6021, 148 30.8642, 30.8642, 34.6021, 34.6021, 34.6021, 34.6021, 39.0625,
149 39.0625, 39.0625, 39.0625, 44.4444, 149 39.0625, 39.0625, 39.0625, 44.4444, 44.4444, 44.4444, 44.4444,
150 51.0204, 51.0204, 51.0204, 51.0204, 150 51.0204, 51.0204, 51.0204, 51.0204, 59.1716, 59.1716, 59.1716,
151 59.1716, 59.1716, 69.4444, 69.4444, 151 59.1716, 59.1716, 69.4444, 69.4444, 69.4444, 69.4444, 82.6446,
152 82.6446, 82.6446, 82.6446, 82.6446, 152 82.6446, 82.6446, 82.6446, 82.6446, 100
153 }; 153 };
154 154
155 //....oooOO0OOooo........oooOO0OOooo........oo 155 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
156 156
157 G4Generator2BN::G4Generator2BN(const G4String& 157 G4Generator2BN::G4Generator2BN(const G4String&)
158 : G4VEmAngularDistribution("AngularGen2BN") 158 : G4VEmAngularDistribution("AngularGen2BN")
159 { 159 {
160 b = 1.2; 160 b = 1.2;
161 index_min = -300; 161 index_min = -300;
162 index_max = 319; 162 index_max = 319;
163 163
164 // Set parameters minimum limits Ekelectron 164 // Set parameters minimum limits Ekelectron = 250 eV and kphoton = 100 eV
165 kmin = 100*eV; 165 kmin = 100*eV;
166 Ekmin = 250*eV; 166 Ekmin = 250*eV;
167 kcut = 100*eV; 167 kcut = 100*eV;
168 168
169 // Increment Theta value for surface interpo 169 // Increment Theta value for surface interpolation
170 dtheta = 0.1*rad; 170 dtheta = 0.1*rad;
171 171
172 nwarn = 0; 172 nwarn = 0;
173 173
174 // Construct Majorant Surface to 2BN cross-s 174 // Construct Majorant Surface to 2BN cross-section
175 // (we dont need this. Pre-calculated values 175 // (we dont need this. Pre-calculated values are used instead due to performance issues
176 // ConstructMajorantSurface(); 176 // ConstructMajorantSurface();
177 } 177 }
178 178
179 //....oooOO0OOooo........oooOO0OOooo........oo 179 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
180 180
181 G4ThreeVector& G4Generator2BN::SampleDirection 181 G4ThreeVector& G4Generator2BN::SampleDirection(const G4DynamicParticle* dp,
182 G4double out_energy, 182 G4double out_energy,
183 G4int, 183 G4int,
184 const G4Material*) 184 const G4Material*)
185 { 185 {
186 G4double Ek = dp->GetKineticEnergy(); 186 G4double Ek = dp->GetKineticEnergy();
187 G4double Eel = dp->GetTotalEnergy(); 187 G4double Eel = dp->GetTotalEnergy();
188 if(Eel > 2*MeV) { 188 if(Eel > 2*MeV) {
189 return fGenerator2BS.SampleDirection(dp, o 189 return fGenerator2BS.SampleDirection(dp, out_energy, 0);
190 } 190 }
191 191
192 G4double k = Eel - out_energy; 192 G4double k = Eel - out_energy;
193 193
194 G4double t; 194 G4double t;
195 G4double cte2; 195 G4double cte2;
196 G4double y, u; 196 G4double y, u;
197 G4double ds; 197 G4double ds;
198 G4double dmax; 198 G4double dmax;
199 199
200 // find table index 200 // find table index
201 G4int index = G4int(std::log10(Ek/MeV)*100) 201 G4int index = G4int(std::log10(Ek/MeV)*100) - index_min;
202 if(index > index_max) { index = index_max; } 202 if(index > index_max) { index = index_max; }
203 else if(index < 0) { index = 0; } 203 else if(index < 0) { index = 0; }
204 204
205 G4double c = ctab[index]; 205 G4double c = ctab[index];
206 G4double A = Atab[index]; 206 G4double A = Atab[index];
207 if(index < index_max) { A = std::max(A, Atab 207 if(index < index_max) { A = std::max(A, Atab[index+1]); }
208 208
209 do{ 209 do{
210 // generate k accordimg to std::pow(k,-b) 210 // generate k accordimg to std::pow(k,-b)
211 211
212 // normalization constant 212 // normalization constant
213 // cte1 = (1-b)/(std::pow(kmax,(1-b))-std 213 // cte1 = (1-b)/(std::pow(kmax,(1-b))-std::pow(kmin2,(1-b)));
214 // y = G4UniformRand(); 214 // y = G4UniformRand();
215 // k = std::pow(((1-b)/cte1*y+std::pow(km 215 // k = std::pow(((1-b)/cte1*y+std::pow(kmin2,(1-b))),(1/(1-b)));
216 216
217 // generate theta accordimg to theta/(1+c* 217 // generate theta accordimg to theta/(1+c*std::pow(theta,2)
218 // Normalization constant 218 // Normalization constant
219 cte2 = 2*c/std::log(1+c*pi2); 219 cte2 = 2*c/std::log(1+c*pi2);
220 220
221 y = G4UniformRand(); 221 y = G4UniformRand();
222 t = std::sqrt((G4Exp(2*c*y/cte2)-1)/c); 222 t = std::sqrt((G4Exp(2*c*y/cte2)-1)/c);
223 u = G4UniformRand(); 223 u = G4UniformRand();
224 224
225 // point acceptance algorithm 225 // point acceptance algorithm
226 //fk = std::pow(k,-b); 226 //fk = std::pow(k,-b);
227 //ft = t/(1+c*t*t); 227 //ft = t/(1+c*t*t);
228 dmax = A*std::pow(k,-b)*t/(1+c*t*t); 228 dmax = A*std::pow(k,-b)*t/(1+c*t*t);
229 ds = Calculatedsdkdt(k,t,Eel); 229 ds = Calculatedsdkdt(k,t,Eel);
230 230
231 // violation point 231 // violation point
232 if(ds > dmax && nwarn >= 20) { 232 if(ds > dmax && nwarn >= 20) {
233 ++nwarn; 233 ++nwarn;
234 G4cout << "### WARNING in G4Generator2BN 234 G4cout << "### WARNING in G4Generator2BN: Ekin(MeV)= " << Ek/MeV
235 << " D(Ekin,k)/Dmax-1= " << (ds/dmax - 235 << " D(Ekin,k)/Dmax-1= " << (ds/dmax - 1)
236 << " results are not reliable!" 236 << " results are not reliable!"
237 << G4endl; 237 << G4endl;
238 if(20 == nwarn) { 238 if(20 == nwarn) {
239 G4cout << " WARNING in G4Generator2BN is c 239 G4cout << " WARNING in G4Generator2BN is closed" << G4endl;
240 } 240 }
241 } 241 }
242 242
243 } while(u*dmax > ds || t > CLHEP::pi); 243 } while(u*dmax > ds || t > CLHEP::pi);
244 244
245 G4double sint = std::sin(t); 245 G4double sint = std::sin(t);
246 G4double phi = twopi*G4UniformRand(); 246 G4double phi = twopi*G4UniformRand();
247 247
248 fLocalDirection.set(sint*std::cos(phi), sint 248 fLocalDirection.set(sint*std::cos(phi), sint*std::sin(phi),std::cos(t));
249 fLocalDirection.rotateUz(dp->GetMomentumDire 249 fLocalDirection.rotateUz(dp->GetMomentumDirection());
250 250
251 return fLocalDirection; 251 return fLocalDirection;
252 } 252 }
253 253
254 //....oooOO0OOooo........oooOO0OOooo........oo 254 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
255 255
256 G4double G4Generator2BN::CalculateFkt(G4double 256 G4double G4Generator2BN::CalculateFkt(G4double k, G4double theta, G4double A, G4double c) const
257 { 257 {
258 G4double Fkt_value = 0; 258 G4double Fkt_value = 0;
259 Fkt_value = A*std::pow(k,-b)*theta/(1+c*thet 259 Fkt_value = A*std::pow(k,-b)*theta/(1+c*theta*theta);
260 return Fkt_value; 260 return Fkt_value;
261 } 261 }
262 262
263 //....oooOO0OOooo........oooOO0OOooo........oo 263 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
264 264
265 G4double G4Generator2BN::Calculatedsdkdt(G4dou 265 G4double G4Generator2BN::Calculatedsdkdt(G4double kout, G4double theta, G4double Eel) const
266 { 266 {
267 G4double dsdkdt_value = 0.; 267 G4double dsdkdt_value = 0.;
268 G4double Z = 1; 268 G4double Z = 1;
269 // classic radius (in cm) 269 // classic radius (in cm)
270 G4double r0 = 2.82E-13; 270 G4double r0 = 2.82E-13;
271 //squared classic radius (in barn) 271 //squared classic radius (in barn)
272 G4double r02 = r0*r0*1.0E+24; 272 G4double r02 = r0*r0*1.0E+24;
273 273
274 // Photon energy cannot be greater than elec 274 // Photon energy cannot be greater than electron kinetic energy
275 if(kout > (Eel-electron_mass_c2)){ 275 if(kout > (Eel-electron_mass_c2)){
276 dsdkdt_value = 0; 276 dsdkdt_value = 0;
277 return dsdkdt_value; 277 return dsdkdt_value;
278 } 278 }
279 279
280 G4double E0 = Eel/electron_mass_c2; 280 G4double E0 = Eel/electron_mass_c2;
281 G4double k = kout/electron_mass_c2; 281 G4double k = kout/electron_mass_c2;
282 G4double E = E0 - k; 282 G4double E = E0 - k;
283 283
284 if(E <= 1*MeV ){ 284 if(E <= 1*MeV ){ // Kinematic limit at 1 MeV !!
285 dsdkdt_value = 0; 285 dsdkdt_value = 0;
286 return dsdkdt_value; 286 return dsdkdt_value;
287 } 287 }
288 288
289 G4double p0 = std::sqrt(E0*E0-1); 289 G4double p0 = std::sqrt(E0*E0-1);
290 G4double p = std::sqrt(E*E-1); 290 G4double p = std::sqrt(E*E-1);
291 G4double LL = std::log((E*E0-1+p*p0)/(E*E0-1 291 G4double LL = std::log((E*E0-1+p*p0)/(E*E0-1-p*p0));
292 G4double delta0 = E0 - p0*std::cos(theta); 292 G4double delta0 = E0 - p0*std::cos(theta);
293 G4double epsilon = std::log((E+p)/(E-p)); 293 G4double epsilon = std::log((E+p)/(E-p));
294 G4double Z2 = Z*Z; 294 G4double Z2 = Z*Z;
295 G4double sintheta2 = std::sin(theta)*std::si 295 G4double sintheta2 = std::sin(theta)*std::sin(theta);
296 G4double E02 = E0*E0; 296 G4double E02 = E0*E0;
297 G4double E2 = E*E; 297 G4double E2 = E*E;
298 G4double p02 = E0*E0-1; 298 G4double p02 = E0*E0-1;
299 G4double k2 = k*k; 299 G4double k2 = k*k;
300 G4double delta02 = delta0*delta0; 300 G4double delta02 = delta0*delta0;
301 G4double delta04 = delta02* delta02; 301 G4double delta04 = delta02* delta02;
302 G4double Q = std::sqrt(p02+k2-2*k*p0*std::co 302 G4double Q = std::sqrt(p02+k2-2*k*p0*std::cos(theta));
303 G4double Q2 = Q*Q; 303 G4double Q2 = Q*Q;
304 G4double epsilonQ = std::log((Q+p)/(Q-p)); 304 G4double epsilonQ = std::log((Q+p)/(Q-p));
305 305
306 306
307 dsdkdt_value = Z2 * (r02/(8*pi*137)) * (1/k) 307 dsdkdt_value = Z2 * (r02/(8*pi*137)) * (1/k) * (p/p0) *
308 ( (8 * (sintheta2*(2*E02+1))/(p02*delta04) 308 ( (8 * (sintheta2*(2*E02+1))/(p02*delta04)) -
309 ((2*(5*E02+2*E*E0+3))/(p02 * delta02)) - 309 ((2*(5*E02+2*E*E0+3))/(p02 * delta02)) -
310 ((2*(p02-k2))/((Q2*delta02))) + 310 ((2*(p02-k2))/((Q2*delta02))) +
311 ((4*E)/(p02*delta0)) + 311 ((4*E)/(p02*delta0)) +
312 (LL/(p*p0))*( 312 (LL/(p*p0))*(
313 ((4*E0*sintheta2*(3*k-p02*E))/(p02*delt 313 ((4*E0*sintheta2*(3*k-p02*E))/(p02*delta04)) +
314 ((4*E02*(E02+E2))/(p02*delta02)) + 314 ((4*E02*(E02+E2))/(p02*delta02)) +
315 ((2-2*(7*E02-3*E*E0+E2))/(p02*delta02)) 315 ((2-2*(7*E02-3*E*E0+E2))/(p02*delta02)) +
316 (2*k*(E02+E*E0-1))/((p02*delta0)) 316 (2*k*(E02+E*E0-1))/((p02*delta0))
317 ) - 317 ) -
318 ((4*epsilon)/(p*delta0)) + 318 ((4*epsilon)/(p*delta0)) +
319 ((epsilonQ)/(p*Q))* 319 ((epsilonQ)/(p*Q))*
320 (4/delta02-(6*k/delta0)-(2*k*(p02-k2))/( 320 (4/delta02-(6*k/delta0)-(2*k*(p02-k2))/(Q2*delta0))
321 ); 321 );
322 322
323 dsdkdt_value = dsdkdt_value*std::sin(theta); 323 dsdkdt_value = dsdkdt_value*std::sin(theta);
324 return dsdkdt_value; 324 return dsdkdt_value;
325 } 325 }
326 326
327 //....oooOO0OOooo........oooOO0OOooo........oo 327 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
328 328
329 void G4Generator2BN::ConstructMajorantSurface( 329 void G4Generator2BN::ConstructMajorantSurface()
330 { 330 {
331 G4double Eel; 331 G4double Eel;
332 G4int vmax; 332 G4int vmax;
333 G4double Ek; 333 G4double Ek;
334 G4double k, theta, k0, theta0, thetamax; 334 G4double k, theta, k0, theta0, thetamax;
335 G4double ds, df, dsmax, dk, dt; 335 G4double ds, df, dsmax, dk, dt;
336 G4double ratmin; 336 G4double ratmin;
337 G4double ratio = 0; 337 G4double ratio = 0;
338 G4double Vds, Vdf; 338 G4double Vds, Vdf;
339 G4double A, c; 339 G4double A, c;
340 340
341 G4cout << "**** Constructing Majorant Surfac 341 G4cout << "**** Constructing Majorant Surface for 2BN Distribution ****" << G4endl;
342 342
343 if(kcut > kmin) kmin = kcut; 343 if(kcut > kmin) kmin = kcut;
344 344
345 G4int i = 0; 345 G4int i = 0;
346 // Loop on energy index 346 // Loop on energy index
347 for(G4int index = index_min; index < index_m 347 for(G4int index = index_min; index < index_max; index++){
348 348
349 G4double fraction = index/100.; 349 G4double fraction = index/100.;
350 Ek = std::pow(10.,fraction); 350 Ek = std::pow(10.,fraction);
351 Eel = Ek + electron_mass_c2; 351 Eel = Ek + electron_mass_c2;
352 352
353 // find x-section maximum at k=kmin 353 // find x-section maximum at k=kmin
354 dsmax = 0.; 354 dsmax = 0.;
355 thetamax = 0.; 355 thetamax = 0.;
356 356
357 for(theta = 0.; theta < pi; theta = theta + 357 for(theta = 0.; theta < pi; theta = theta + dtheta){
358 358
359 ds = Calculatedsdkdt(kmin, theta, Eel); 359 ds = Calculatedsdkdt(kmin, theta, Eel);
360 360
361 if(ds > dsmax){ 361 if(ds > dsmax){
362 dsmax = ds; 362 dsmax = ds;
363 thetamax = theta; 363 thetamax = theta;
364 } 364 }
365 } 365 }
366 366
367 // Compute surface paremeters at kmin 367 // Compute surface paremeters at kmin
368 if(Ek < kmin || thetamax == 0){ 368 if(Ek < kmin || thetamax == 0){
369 c = 0; 369 c = 0;
370 A = 0; 370 A = 0;
371 }else{ 371 }else{
372 c = 1/(thetamax*thetamax); 372 c = 1/(thetamax*thetamax);
373 A = 2*std::sqrt(c)*dsmax/(std::pow(kmin,-b 373 A = 2*std::sqrt(c)*dsmax/(std::pow(kmin,-b));
374 } 374 }
375 375
376 // look for correction factor to normalizati 376 // look for correction factor to normalization at kmin
377 ratmin = 1.; 377 ratmin = 1.;
378 378
379 // Volume under surfaces 379 // Volume under surfaces
380 Vds = 0.; 380 Vds = 0.;
381 Vdf = 0.; 381 Vdf = 0.;
382 k0 = 0.; 382 k0 = 0.;
383 theta0 = 0.; 383 theta0 = 0.;
384 384
385 vmax = G4int(100.*std::log10(Ek/kmin)); 385 vmax = G4int(100.*std::log10(Ek/kmin));
386 386
387 for(G4int v = 0; v < vmax; v++){ 387 for(G4int v = 0; v < vmax; v++){
388 G4double fractionLocal = (v/100.); 388 G4double fractionLocal = (v/100.);
389 k = std::pow(10.,fractionLocal)*kmin; 389 k = std::pow(10.,fractionLocal)*kmin;
390 390
391 for(theta = 0.; theta < pi; theta = theta 391 for(theta = 0.; theta < pi; theta = theta + dtheta){
392 dk = k - k0; 392 dk = k - k0;
393 dt = theta - theta0; 393 dt = theta - theta0;
394 ds = Calculatedsdkdt(k,theta, Eel); 394 ds = Calculatedsdkdt(k,theta, Eel);
395 Vds = Vds + ds*dk*dt; 395 Vds = Vds + ds*dk*dt;
396 df = CalculateFkt(k,theta, A, c); 396 df = CalculateFkt(k,theta, A, c);
397 Vdf = Vdf + df*dk*dt; 397 Vdf = Vdf + df*dk*dt;
398 398
399 if(ds != 0.){ 399 if(ds != 0.){
400 if(df != 0.) ratio = df/ds; 400 if(df != 0.) ratio = df/ds;
401 } 401 }
402 402
403 if(ratio < ratmin && ratio != 0.){ 403 if(ratio < ratmin && ratio != 0.){
404 ratmin = ratio; 404 ratmin = ratio;
405 } 405 }
406 } 406 }
407 } 407 }
408 408
409 // sampling efficiency 409 // sampling efficiency
410 Atab[i] = A/ratmin * 1.04; 410 Atab[i] = A/ratmin * 1.04;
411 ctab[i] = c; 411 ctab[i] = c;
412 412
413 // G4cout << Ek << " " << i << " " << index < 413 // G4cout << Ek << " " << i << " " << index << " " << Atab[i] << " " << ctab[i] << " " << G4endl;
414 i++; 414 i++;
415 } 415 }
416 } 416 }
417 417
418 //....oooOO0OOooo........oooOO0OOooo........oo 418 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
419 419
420 void G4Generator2BN::PrintGeneratorInformation 420 void G4Generator2BN::PrintGeneratorInformation() const
421 { 421 {
422 G4cout << "\n" << G4endl; 422 G4cout << "\n" << G4endl;
423 G4cout << "Bremsstrahlung Angular Generator 423 G4cout << "Bremsstrahlung Angular Generator is 2BN Generator from 2BN Koch & Motz distribution (Rev Mod Phys 31(4), 920 (1959))" << G4endl;
424 G4cout << "\n" << G4endl; 424 G4cout << "\n" << G4endl;
425 } 425 }
426 426