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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 G4int trials = 0;
>> 201
200 // find table index 202 // find table index
201 G4int index = G4int(std::log10(Ek/MeV)*100) 203 G4int index = G4int(std::log10(Ek/MeV)*100) - index_min;
202 if(index > index_max) { index = index_max; } 204 if(index > index_max) { index = index_max; }
203 else if(index < 0) { index = 0; } 205 else if(index < 0) { index = 0; }
204 206
205 G4double c = ctab[index]; 207 G4double c = ctab[index];
206 G4double A = Atab[index]; 208 G4double A = Atab[index];
207 if(index < index_max) { A = std::max(A, Atab 209 if(index < index_max) { A = std::max(A, Atab[index+1]); }
208 210
209 do{ 211 do{
210 // generate k accordimg to std::pow(k,-b) 212 // generate k accordimg to std::pow(k,-b)
>> 213 trials++;
211 214
212 // normalization constant 215 // normalization constant
213 // cte1 = (1-b)/(std::pow(kmax,(1-b))-std 216 // cte1 = (1-b)/(std::pow(kmax,(1-b))-std::pow(kmin2,(1-b)));
214 // y = G4UniformRand(); 217 // y = G4UniformRand();
215 // k = std::pow(((1-b)/cte1*y+std::pow(km 218 // k = std::pow(((1-b)/cte1*y+std::pow(kmin2,(1-b))),(1/(1-b)));
216 219
217 // generate theta accordimg to theta/(1+c* 220 // generate theta accordimg to theta/(1+c*std::pow(theta,2)
218 // Normalization constant 221 // Normalization constant
219 cte2 = 2*c/std::log(1+c*pi2); 222 cte2 = 2*c/std::log(1+c*pi2);
220 223
221 y = G4UniformRand(); 224 y = G4UniformRand();
222 t = std::sqrt((G4Exp(2*c*y/cte2)-1)/c); 225 t = std::sqrt((G4Exp(2*c*y/cte2)-1)/c);
223 u = G4UniformRand(); 226 u = G4UniformRand();
224 227
225 // point acceptance algorithm 228 // point acceptance algorithm
226 //fk = std::pow(k,-b); 229 //fk = std::pow(k,-b);
227 //ft = t/(1+c*t*t); 230 //ft = t/(1+c*t*t);
228 dmax = A*std::pow(k,-b)*t/(1+c*t*t); 231 dmax = A*std::pow(k,-b)*t/(1+c*t*t);
229 ds = Calculatedsdkdt(k,t,Eel); 232 ds = Calculatedsdkdt(k,t,Eel);
230 233
231 // violation point 234 // violation point
232 if(ds > dmax && nwarn >= 20) { 235 if(ds > dmax && nwarn >= 20) {
233 ++nwarn; 236 ++nwarn;
234 G4cout << "### WARNING in G4Generator2BN 237 G4cout << "### WARNING in G4Generator2BN: Ekin(MeV)= " << Ek/MeV
235 << " D(Ekin,k)/Dmax-1= " << (ds/dmax - 238 << " D(Ekin,k)/Dmax-1= " << (ds/dmax - 1)
236 << " results are not reliable!" 239 << " results are not reliable!"
237 << G4endl; 240 << G4endl;
238 if(20 == nwarn) { 241 if(20 == nwarn) {
239 G4cout << " WARNING in G4Generator2BN is c 242 G4cout << " WARNING in G4Generator2BN is closed" << G4endl;
240 } 243 }
241 } 244 }
242 245
243 } while(u*dmax > ds || t > CLHEP::pi); 246 } while(u*dmax > ds || t > CLHEP::pi);
244 247
245 G4double sint = std::sin(t); 248 G4double sint = std::sin(t);
246 G4double phi = twopi*G4UniformRand(); 249 G4double phi = twopi*G4UniformRand();
247 250
248 fLocalDirection.set(sint*std::cos(phi), sint 251 fLocalDirection.set(sint*std::cos(phi), sint*std::sin(phi),std::cos(t));
249 fLocalDirection.rotateUz(dp->GetMomentumDire 252 fLocalDirection.rotateUz(dp->GetMomentumDirection());
250 253
251 return fLocalDirection; 254 return fLocalDirection;
252 } 255 }
253 256
254 //....oooOO0OOooo........oooOO0OOooo........oo 257 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
255 258
256 G4double G4Generator2BN::CalculateFkt(G4double 259 G4double G4Generator2BN::CalculateFkt(G4double k, G4double theta, G4double A, G4double c) const
257 { 260 {
258 G4double Fkt_value = 0; 261 G4double Fkt_value = 0;
259 Fkt_value = A*std::pow(k,-b)*theta/(1+c*thet 262 Fkt_value = A*std::pow(k,-b)*theta/(1+c*theta*theta);
260 return Fkt_value; 263 return Fkt_value;
261 } 264 }
262 265
263 //....oooOO0OOooo........oooOO0OOooo........oo 266 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
264 267
265 G4double G4Generator2BN::Calculatedsdkdt(G4dou 268 G4double G4Generator2BN::Calculatedsdkdt(G4double kout, G4double theta, G4double Eel) const
266 { 269 {
267 G4double dsdkdt_value = 0.; 270 G4double dsdkdt_value = 0.;
268 G4double Z = 1; 271 G4double Z = 1;
269 // classic radius (in cm) 272 // classic radius (in cm)
270 G4double r0 = 2.82E-13; 273 G4double r0 = 2.82E-13;
271 //squared classic radius (in barn) 274 //squared classic radius (in barn)
272 G4double r02 = r0*r0*1.0E+24; 275 G4double r02 = r0*r0*1.0E+24;
273 276
274 // Photon energy cannot be greater than elec 277 // Photon energy cannot be greater than electron kinetic energy
275 if(kout > (Eel-electron_mass_c2)){ 278 if(kout > (Eel-electron_mass_c2)){
276 dsdkdt_value = 0; 279 dsdkdt_value = 0;
277 return dsdkdt_value; 280 return dsdkdt_value;
278 } 281 }
279 282
280 G4double E0 = Eel/electron_mass_c2; 283 G4double E0 = Eel/electron_mass_c2;
281 G4double k = kout/electron_mass_c2; 284 G4double k = kout/electron_mass_c2;
282 G4double E = E0 - k; 285 G4double E = E0 - k;
283 286
284 if(E <= 1*MeV ){ 287 if(E <= 1*MeV ){ // Kinematic limit at 1 MeV !!
285 dsdkdt_value = 0; 288 dsdkdt_value = 0;
286 return dsdkdt_value; 289 return dsdkdt_value;
287 } 290 }
288 291
289 G4double p0 = std::sqrt(E0*E0-1); 292 G4double p0 = std::sqrt(E0*E0-1);
290 G4double p = std::sqrt(E*E-1); 293 G4double p = std::sqrt(E*E-1);
291 G4double LL = std::log((E*E0-1+p*p0)/(E*E0-1 294 G4double LL = std::log((E*E0-1+p*p0)/(E*E0-1-p*p0));
292 G4double delta0 = E0 - p0*std::cos(theta); 295 G4double delta0 = E0 - p0*std::cos(theta);
293 G4double epsilon = std::log((E+p)/(E-p)); 296 G4double epsilon = std::log((E+p)/(E-p));
294 G4double Z2 = Z*Z; 297 G4double Z2 = Z*Z;
295 G4double sintheta2 = std::sin(theta)*std::si 298 G4double sintheta2 = std::sin(theta)*std::sin(theta);
296 G4double E02 = E0*E0; 299 G4double E02 = E0*E0;
297 G4double E2 = E*E; 300 G4double E2 = E*E;
298 G4double p02 = E0*E0-1; 301 G4double p02 = E0*E0-1;
299 G4double k2 = k*k; 302 G4double k2 = k*k;
300 G4double delta02 = delta0*delta0; 303 G4double delta02 = delta0*delta0;
301 G4double delta04 = delta02* delta02; 304 G4double delta04 = delta02* delta02;
302 G4double Q = std::sqrt(p02+k2-2*k*p0*std::co 305 G4double Q = std::sqrt(p02+k2-2*k*p0*std::cos(theta));
303 G4double Q2 = Q*Q; 306 G4double Q2 = Q*Q;
304 G4double epsilonQ = std::log((Q+p)/(Q-p)); 307 G4double epsilonQ = std::log((Q+p)/(Q-p));
305 308
306 309
307 dsdkdt_value = Z2 * (r02/(8*pi*137)) * (1/k) 310 dsdkdt_value = Z2 * (r02/(8*pi*137)) * (1/k) * (p/p0) *
308 ( (8 * (sintheta2*(2*E02+1))/(p02*delta04) 311 ( (8 * (sintheta2*(2*E02+1))/(p02*delta04)) -
309 ((2*(5*E02+2*E*E0+3))/(p02 * delta02)) - 312 ((2*(5*E02+2*E*E0+3))/(p02 * delta02)) -
310 ((2*(p02-k2))/((Q2*delta02))) + 313 ((2*(p02-k2))/((Q2*delta02))) +
311 ((4*E)/(p02*delta0)) + 314 ((4*E)/(p02*delta0)) +
312 (LL/(p*p0))*( 315 (LL/(p*p0))*(
313 ((4*E0*sintheta2*(3*k-p02*E))/(p02*delt 316 ((4*E0*sintheta2*(3*k-p02*E))/(p02*delta04)) +
314 ((4*E02*(E02+E2))/(p02*delta02)) + 317 ((4*E02*(E02+E2))/(p02*delta02)) +
315 ((2-2*(7*E02-3*E*E0+E2))/(p02*delta02)) 318 ((2-2*(7*E02-3*E*E0+E2))/(p02*delta02)) +
316 (2*k*(E02+E*E0-1))/((p02*delta0)) 319 (2*k*(E02+E*E0-1))/((p02*delta0))
317 ) - 320 ) -
318 ((4*epsilon)/(p*delta0)) + 321 ((4*epsilon)/(p*delta0)) +
319 ((epsilonQ)/(p*Q))* 322 ((epsilonQ)/(p*Q))*
320 (4/delta02-(6*k/delta0)-(2*k*(p02-k2))/( 323 (4/delta02-(6*k/delta0)-(2*k*(p02-k2))/(Q2*delta0))
321 ); 324 );
322 325
323 dsdkdt_value = dsdkdt_value*std::sin(theta); 326 dsdkdt_value = dsdkdt_value*std::sin(theta);
324 return dsdkdt_value; 327 return dsdkdt_value;
325 } 328 }
326 329
327 //....oooOO0OOooo........oooOO0OOooo........oo 330 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
328 331
329 void G4Generator2BN::ConstructMajorantSurface( 332 void G4Generator2BN::ConstructMajorantSurface()
330 { 333 {
331 G4double Eel; 334 G4double Eel;
332 G4int vmax; 335 G4int vmax;
333 G4double Ek; 336 G4double Ek;
334 G4double k, theta, k0, theta0, thetamax; 337 G4double k, theta, k0, theta0, thetamax;
335 G4double ds, df, dsmax, dk, dt; 338 G4double ds, df, dsmax, dk, dt;
336 G4double ratmin; 339 G4double ratmin;
337 G4double ratio = 0; 340 G4double ratio = 0;
338 G4double Vds, Vdf; 341 G4double Vds, Vdf;
339 G4double A, c; 342 G4double A, c;
340 343
341 G4cout << "**** Constructing Majorant Surfac 344 G4cout << "**** Constructing Majorant Surface for 2BN Distribution ****" << G4endl;
342 345
343 if(kcut > kmin) kmin = kcut; 346 if(kcut > kmin) kmin = kcut;
344 347
345 G4int i = 0; 348 G4int i = 0;
346 // Loop on energy index 349 // Loop on energy index
347 for(G4int index = index_min; index < index_m 350 for(G4int index = index_min; index < index_max; index++){
348 351
349 G4double fraction = index/100.; 352 G4double fraction = index/100.;
350 Ek = std::pow(10.,fraction); 353 Ek = std::pow(10.,fraction);
351 Eel = Ek + electron_mass_c2; 354 Eel = Ek + electron_mass_c2;
352 355
353 // find x-section maximum at k=kmin 356 // find x-section maximum at k=kmin
354 dsmax = 0.; 357 dsmax = 0.;
355 thetamax = 0.; 358 thetamax = 0.;
356 359
357 for(theta = 0.; theta < pi; theta = theta + 360 for(theta = 0.; theta < pi; theta = theta + dtheta){
358 361
359 ds = Calculatedsdkdt(kmin, theta, Eel); 362 ds = Calculatedsdkdt(kmin, theta, Eel);
360 363
361 if(ds > dsmax){ 364 if(ds > dsmax){
362 dsmax = ds; 365 dsmax = ds;
363 thetamax = theta; 366 thetamax = theta;
364 } 367 }
365 } 368 }
366 369
367 // Compute surface paremeters at kmin 370 // Compute surface paremeters at kmin
368 if(Ek < kmin || thetamax == 0){ 371 if(Ek < kmin || thetamax == 0){
369 c = 0; 372 c = 0;
370 A = 0; 373 A = 0;
371 }else{ 374 }else{
372 c = 1/(thetamax*thetamax); 375 c = 1/(thetamax*thetamax);
373 A = 2*std::sqrt(c)*dsmax/(std::pow(kmin,-b 376 A = 2*std::sqrt(c)*dsmax/(std::pow(kmin,-b));
374 } 377 }
375 378
376 // look for correction factor to normalizati 379 // look for correction factor to normalization at kmin
377 ratmin = 1.; 380 ratmin = 1.;
378 381
379 // Volume under surfaces 382 // Volume under surfaces
380 Vds = 0.; 383 Vds = 0.;
381 Vdf = 0.; 384 Vdf = 0.;
382 k0 = 0.; 385 k0 = 0.;
383 theta0 = 0.; 386 theta0 = 0.;
384 387
385 vmax = G4int(100.*std::log10(Ek/kmin)); 388 vmax = G4int(100.*std::log10(Ek/kmin));
386 389
387 for(G4int v = 0; v < vmax; v++){ 390 for(G4int v = 0; v < vmax; v++){
388 G4double fractionLocal = (v/100.); 391 G4double fractionLocal = (v/100.);
389 k = std::pow(10.,fractionLocal)*kmin; 392 k = std::pow(10.,fractionLocal)*kmin;
390 393
391 for(theta = 0.; theta < pi; theta = theta 394 for(theta = 0.; theta < pi; theta = theta + dtheta){
392 dk = k - k0; 395 dk = k - k0;
393 dt = theta - theta0; 396 dt = theta - theta0;
394 ds = Calculatedsdkdt(k,theta, Eel); 397 ds = Calculatedsdkdt(k,theta, Eel);
395 Vds = Vds + ds*dk*dt; 398 Vds = Vds + ds*dk*dt;
396 df = CalculateFkt(k,theta, A, c); 399 df = CalculateFkt(k,theta, A, c);
397 Vdf = Vdf + df*dk*dt; 400 Vdf = Vdf + df*dk*dt;
398 401
399 if(ds != 0.){ 402 if(ds != 0.){
400 if(df != 0.) ratio = df/ds; 403 if(df != 0.) ratio = df/ds;
401 } 404 }
402 405
403 if(ratio < ratmin && ratio != 0.){ 406 if(ratio < ratmin && ratio != 0.){
404 ratmin = ratio; 407 ratmin = ratio;
405 } 408 }
406 } 409 }
407 } 410 }
408 411
409 // sampling efficiency 412 // sampling efficiency
410 Atab[i] = A/ratmin * 1.04; 413 Atab[i] = A/ratmin * 1.04;
411 ctab[i] = c; 414 ctab[i] = c;
412 415
413 // G4cout << Ek << " " << i << " " << index < 416 // G4cout << Ek << " " << i << " " << index << " " << Atab[i] << " " << ctab[i] << " " << G4endl;
414 i++; 417 i++;
415 } 418 }
416 } 419 }
417 420
418 //....oooOO0OOooo........oooOO0OOooo........oo 421 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
419 422
420 void G4Generator2BN::PrintGeneratorInformation 423 void G4Generator2BN::PrintGeneratorInformation() const
421 { 424 {
422 G4cout << "\n" << G4endl; 425 G4cout << "\n" << G4endl;
423 G4cout << "Bremsstrahlung Angular Generator 426 G4cout << "Bremsstrahlung Angular Generator is 2BN Generator from 2BN Koch & Motz distribution (Rev Mod Phys 31(4), 920 (1959))" << G4endl;
424 G4cout << "\n" << G4endl; 427 G4cout << "\n" << G4endl;
425 } 428 }
426 429