1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: GVFlashHomoShowerTuning.hh,v 1.7 2006/06/29 19:14:04 gunter Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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29 | // |
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30 | // |
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31 | // --------------------------------------------------------------- |
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32 | // GEANT 4 class header file |
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33 | // |
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34 | // GVFlashHomoShowerTuning |
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35 | // |
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36 | // Class description: |
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37 | // |
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38 | // Tuning class for GFlash homogeneous shower parameterisation. |
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39 | // Definitions: |
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40 | // <t>: shower center of gravity |
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41 | // T: Depth at shower maximum |
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42 | // Ec: Critical energy |
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43 | // X0: Radiation length |
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44 | // y = E/Ec |
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45 | // |
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46 | // Homogeneous media: |
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47 | // Average shower profile |
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48 | // (1/E)(dE(t)/dt) = f(t) |
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49 | // = (beta*t)**(alpha-1)*beta*std::exp(-beta*t)/Gamma(alpha) |
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50 | // where Gamma is the Gamma function |
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51 | // |
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52 | // <t> = alpha/beta |
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53 | // T = (alpha-1)/beta |
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54 | // and |
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55 | // T = ln(y) + t1 |
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56 | // alpha = a1+(a2+a3/Z)ln(y) |
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57 | |
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58 | // Author: J.P. Wellisch - October 2004 |
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59 | //--------------------------------------------------------------- |
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60 | #ifndef GVFlashHomoShowerTuning_hh |
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61 | #define GVFlashHomoShowerTuning_hh |
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62 | |
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63 | class GVFlashHomoShowerTuning |
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64 | { |
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65 | public: // with description |
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66 | |
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67 | virtual G4double ParAveT1(){ return -0.812;} // t1 |
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68 | virtual G4double ParAveA1(){ return 0.81; } // a1 |
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69 | virtual G4double ParAveA2(){ return 0.458; } // a2 |
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70 | virtual G4double ParAveA3(){ return 2.26; } // a3 |
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71 | |
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72 | virtual G4double ParSigLogT1(){ return -1.4;} // t1 |
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73 | virtual G4double ParSigLogT2(){ return 1.26;} // t2 |
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74 | // std::sqrt(var(ln(T))) = 1/(t+t2*ln(y)) |
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75 | |
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76 | virtual G4double ParSigLogA1(){ return -0.58;} // a1 |
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77 | virtual G4double ParSigLogA2(){ return 0.86; } // a2 |
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78 | // std::sqrt(var(ln(alpha))) = 1/(a1+a2*ln(y)) |
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79 | |
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80 | virtual G4double ParRho1(){ return 0.705; } // r1 |
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81 | virtual G4double ParRho2(){ return -0.023;} // r2 |
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82 | // Correlation(ln(T),ln(alpha))=r1+r2*ln(y) |
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83 | |
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84 | // Radial profiles |
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85 | // f(r) := (1/dE(t))(dE(t,r)/dr) |
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86 | // Ansatz: |
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87 | // f(r) = p(2*r*Rc**2)/(r**2+Rc**2)**2+(1-p)*(2*r*Rt**2)/(r**2+Rt**2)**2, |
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88 | // 0<p<1 |
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89 | |
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90 | virtual G4double ParRC1(){ return 0.0251; } // c1 |
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91 | virtual G4double ParRC2(){ return 0.00319; } // c2 |
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92 | virtual G4double ParRC3(){ return 0.1162; } // c3 |
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93 | virtual G4double ParRC4(){ return -0.000381;} // c4 |
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94 | // Rc (t/T)= z1 +z2*t/T |
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95 | // z1 = c1+c2*ln(E/GeV) |
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96 | // z2 = c3+c4*Z |
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97 | |
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98 | virtual G4double ParRT1(){ return 0.659; } // t1 |
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99 | virtual G4double ParRT2(){ return -0.00309;} // t2 |
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100 | virtual G4double ParRT3(){ return 0.645; } // k2 |
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101 | virtual G4double ParRT4(){ return -2.59; } // k3 |
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102 | virtual G4double ParRT5(){ return 0.3585; } // t5 |
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103 | virtual G4double ParRT6(){ return 0.0412; } // t6 |
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104 | // Rt (t/T)= k1*(std::exp(k3*(t/T-k2))+std::exp(k4*(t/T-k2))) |
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105 | // k1 = t1+t2*Z |
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106 | // k4 = t5+t6*ln(E/GeV) |
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107 | |
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108 | virtual G4double ParWC1(){ return 2.632; } // c1 |
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109 | virtual G4double ParWC2(){ return -0.00094;} // c2 |
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110 | virtual G4double ParWC3(){ return 0.401; } // c3 |
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111 | virtual G4double ParWC4(){ return 0.00187; } // c4 |
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112 | virtual G4double ParWC5(){ return 1.313; } // c5 |
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113 | virtual G4double ParWC6(){ return -0.0686; } // c6 |
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114 | // p(t/T) = p1*std::exp((p2-t/T)/p3 - std::exp((p2-t/T)/p3)) |
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115 | // p1 = c1+c2*Z |
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116 | // p2 = c3+c4*Z |
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117 | // p3 = c5 + c6*ln(E/GeV) |
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118 | |
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119 | virtual G4double ParSpotN1(){ return 93.; } // n1 |
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120 | virtual G4double ParSpotN2(){ return 0.876;} // n2 |
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121 | // Fluctuations on radial profiles through number of spots |
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122 | // The total number of spots needed for a shower is |
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123 | // Ns = n1*ln(Z)(E/GeV)**n2 |
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124 | |
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125 | // The number of spots per longitudinal interval is: |
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126 | // (1/Ns)(dNs(t)/dt) = f(t) |
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127 | // = (beta*t)**(alpha-1)*beta*std::exp(-beta*t)/Gamma(alpha) |
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128 | // <t> = alpha_s/beta_s |
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129 | // Ts = (alpha_s-1)/beta_s |
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130 | // and |
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131 | // Ts = T*(t1+t2*Z) |
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132 | // alpha_s = alpha*(a1+a2*Z) |
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133 | |
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134 | virtual G4double ParSpotT1(){ return 0.698; } // t1 |
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135 | virtual G4double ParSpotT2(){ return 0.00212;} // t2 |
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136 | |
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137 | virtual G4double ParSpotA1(){ return 0.639; } //a1 |
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138 | virtual G4double ParSpotA2(){ return 0.00334;} //a2 |
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139 | |
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140 | }; |
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141 | |
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142 | #endif |
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