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2 | // ******************************************************************** |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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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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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: G4TwistTrapAlphaSide.hh,v 1.5 2006/06/29 18:47:46 gunter Exp $ |
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28 | // |
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29 | // -------------------------------------------------------------------- |
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30 | // GEANT 4 class header file |
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31 | // |
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32 | // |
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33 | // G4TwistTrapAlphaSide |
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34 | // |
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35 | // Class description: |
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36 | // |
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37 | // Class describing a twisted boundary surface for a trapezoid. |
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38 | |
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39 | // Author: |
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40 | // |
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41 | // 27-Oct-2004 - O.Link (Oliver.Link@cern.ch) |
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42 | // |
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43 | // -------------------------------------------------------------------- |
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44 | #ifndef __G4TWISTTRAPALPHASIDE__ |
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45 | #define __G4TWISTTRAPALPHASIDE__ |
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46 | |
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47 | #include "G4VTwistSurface.hh" |
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48 | |
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49 | #include <vector> |
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50 | |
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51 | class G4TwistTrapAlphaSide : public G4VTwistSurface |
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52 | { |
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53 | public: // with description |
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54 | |
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55 | G4TwistTrapAlphaSide(const G4String &name, |
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56 | G4double PhiTwist, // twist angle |
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57 | G4double pDz, // half z lenght |
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58 | G4double pTheta, // direction between end planes |
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59 | G4double pPhi, // by polar and azimutal angles |
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60 | G4double pDy1, // half y length at -pDz |
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61 | G4double pDx1, // half x length at -pDz,-pDy |
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62 | G4double pDx2, // half x length at -pDz,+pDy |
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63 | G4double pDy2, // half y length at +pDz |
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64 | G4double pDx3, // half x length at +pDz,-pDy |
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65 | G4double pDx4, // half x length at +pDz,+pDy |
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66 | G4double pAlph, // tilt angle at +pDz |
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67 | G4double AngleSide // parity |
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68 | ); |
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69 | |
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70 | virtual ~G4TwistTrapAlphaSide(); |
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71 | |
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72 | virtual G4ThreeVector GetNormal(const G4ThreeVector &xx, |
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73 | G4bool isGlobal = false) ; |
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74 | |
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75 | virtual G4int DistanceToSurface(const G4ThreeVector &gp, |
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76 | const G4ThreeVector &gv, |
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77 | G4ThreeVector gxx[], |
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78 | G4double distance[], |
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79 | G4int areacode[], |
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80 | G4bool isvalid[], |
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81 | EValidate validate = kValidateWithTol); |
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82 | |
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83 | virtual G4int DistanceToSurface(const G4ThreeVector &gp, |
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84 | G4ThreeVector gxx[], |
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85 | G4double distance[], |
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86 | G4int areacode[]); |
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87 | |
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88 | |
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89 | public: // without description |
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90 | |
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91 | G4TwistTrapAlphaSide(__void__&); |
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92 | // Fake default constructor for usage restricted to direct object |
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93 | // persistency for clients requiring preallocation of memory for |
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94 | // persistifiable objects. |
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95 | |
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96 | private: |
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97 | |
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98 | virtual G4int GetAreaCode(const G4ThreeVector &xx, |
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99 | G4bool withTol = true); |
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100 | virtual void SetCorners(); |
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101 | virtual void SetBoundaries(); |
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102 | |
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103 | void GetPhiUAtX(G4ThreeVector p, G4double &phi, G4double &u); |
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104 | G4ThreeVector ProjectPoint(const G4ThreeVector &p, |
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105 | G4bool isglobal = false); |
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106 | |
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107 | virtual G4ThreeVector SurfacePoint(G4double phi, G4double u, |
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108 | G4bool isGlobal = false ); |
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109 | virtual G4double GetBoundaryMin(G4double phi); |
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110 | virtual G4double GetBoundaryMax(G4double phi); |
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111 | virtual G4double GetSurfaceArea(); |
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112 | virtual void GetFacets( G4int m, G4int n, G4double xyz[][3], |
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113 | G4int faces[][4], G4int iside ); |
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114 | |
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115 | inline G4ThreeVector NormAng(G4double phi, G4double u); |
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116 | inline G4double GetValueA(G4double phi); |
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117 | inline G4double GetValueB(G4double phi); |
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118 | inline G4double GetValueD(G4double phi); |
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119 | inline G4double Xcoef(G4double u,G4double phi); |
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120 | // To calculate the w(u) function |
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121 | |
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122 | private: |
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123 | |
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124 | G4double fTheta; |
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125 | G4double fPhi ; |
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126 | |
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127 | G4double fDy1; |
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128 | G4double fDx1; |
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129 | G4double fDx2; |
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130 | |
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131 | G4double fDy2; |
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132 | G4double fDx3; |
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133 | G4double fDx4; |
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134 | |
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135 | G4double fDz; // Half-length along the z axis |
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136 | |
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137 | G4double fAlph; |
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138 | G4double fTAlph; // std::tan(fAlph) |
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139 | |
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140 | G4double fPhiTwist; // twist angle (dphi in surface equation) |
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141 | |
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142 | G4double fAngleSide; |
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143 | |
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144 | G4double fDx4plus2; // fDx4 + fDx2 == a2/2 + a1/2 |
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145 | G4double fDx4minus2; // fDx4 - fDx2 - |
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146 | G4double fDx3plus1; // fDx3 + fDx1 == d2/2 + d1/2 |
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147 | G4double fDx3minus1; // fDx3 - fDx1 - |
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148 | G4double fDy2plus1; // fDy2 + fDy1 == b2/2 + b1/2 |
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149 | G4double fDy2minus1; // fDy2 - fDy1 - |
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150 | G4double fa1md1; // 2 fDx2 - 2 fDx1 == a1 - d1 |
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151 | G4double fa2md2; // 2 fDx4 - 2 fDx3 |
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152 | |
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153 | G4double fdeltaX; |
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154 | G4double fdeltaY; |
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155 | }; |
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156 | |
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157 | //======================================================== |
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158 | // inline functions |
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159 | //======================================================== |
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160 | |
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161 | inline |
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162 | G4double G4TwistTrapAlphaSide::GetValueA(G4double phi) |
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163 | { |
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164 | return ( fDx4plus2 + fDx4minus2 * ( 2 * phi ) / fPhiTwist ) ; |
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165 | } |
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166 | |
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167 | inline |
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168 | G4double G4TwistTrapAlphaSide::GetValueD(G4double phi) |
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169 | { |
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170 | return ( fDx3plus1 + fDx3minus1 * ( 2 * phi) / fPhiTwist ) ; |
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171 | } |
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172 | |
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173 | inline |
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174 | G4double G4TwistTrapAlphaSide::GetValueB(G4double phi) |
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175 | { |
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176 | return ( fDy2plus1 + fDy2minus1 * ( 2 * phi ) / fPhiTwist ) ; |
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177 | } |
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178 | |
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179 | |
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180 | inline |
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181 | G4double G4TwistTrapAlphaSide::Xcoef(G4double u, G4double phi) |
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182 | { |
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183 | |
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184 | return GetValueA(phi)/2. + (GetValueD(phi)-GetValueA(phi))/4. |
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185 | - u*( ( GetValueD(phi)-GetValueA(phi) )/( 2 * GetValueB(phi) ) - fTAlph ); |
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186 | |
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187 | } |
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188 | |
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189 | inline G4ThreeVector |
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190 | G4TwistTrapAlphaSide::SurfacePoint(G4double phi, G4double u , G4bool isGlobal) |
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191 | { |
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192 | // function to calculate a point on the surface, given by parameters phi,u |
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193 | |
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194 | G4ThreeVector SurfPoint ( Xcoef(u,phi) * std::cos(phi) |
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195 | - u * std::sin(phi) + fdeltaX*phi/fPhiTwist, |
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196 | Xcoef(u,phi) * std::sin(phi) |
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197 | + u * std::cos(phi) + fdeltaY*phi/fPhiTwist, |
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198 | 2*fDz*phi/fPhiTwist ); |
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199 | if (isGlobal) { return (fRot * SurfPoint + fTrans); } |
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200 | return SurfPoint; |
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201 | } |
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202 | |
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203 | inline |
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204 | G4double G4TwistTrapAlphaSide::GetBoundaryMin(G4double phi) |
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205 | { |
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206 | return -0.5*GetValueB(phi) ; |
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207 | } |
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208 | |
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209 | inline |
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210 | G4double G4TwistTrapAlphaSide::GetBoundaryMax(G4double phi) |
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211 | { |
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212 | return 0.5*GetValueB(phi) ; |
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213 | } |
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214 | |
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215 | inline |
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216 | G4double G4TwistTrapAlphaSide::GetSurfaceArea() |
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217 | { |
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218 | return (fDz*(std::sqrt(16*fDy1*fDy1 |
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219 | + (fa1md1 + 4*fDy1*fTAlph)*(fa1md1 + 4*fDy1*fTAlph)) |
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220 | + std::sqrt(16*fDy2*fDy2 + (fa2md2 + 4*fDy2*fTAlph) |
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221 | * (fa2md2 + 4*fDy2*fTAlph))))/2. ; |
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222 | } |
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223 | |
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224 | inline |
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225 | G4ThreeVector G4TwistTrapAlphaSide::NormAng( G4double phi, G4double u ) |
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226 | { |
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227 | // function to calculate the norm at a given point on the surface |
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228 | // replace a1-d1 |
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229 | |
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230 | G4ThreeVector nvec ( fDy1* fDz*(4*fDy1*std::cos(phi) |
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231 | + (fa1md1 + 4*fDy1*fTAlph)*std::sin(phi)), |
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232 | -(fDy1* fDz*((fa1md1 + 4*fDy1*fTAlph)*std::cos(phi) |
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233 | - 4*fDy1*std::sin(phi))), |
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234 | (fDy1*(-8*(fDx3minus1 + fDx4minus2)*fDy1 |
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235 | + fa1md1*(fDx2 + fDx3plus1 + fDx4)*fPhiTwist |
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236 | + 4*(fDx2 + fDx3plus1 + fDx4)*fDy1*fPhiTwist |
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237 | *fTAlph + 2*(fDx3minus1 + fDx4minus2) |
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238 | *(fa1md1 + 4*fDy1*fTAlph)*phi) |
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239 | + fPhiTwist*(16*fDy1*fDy1 |
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240 | + (fa1md1 + 4*fDy1*fTAlph) |
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241 | *(fa1md1 + 4*fDy1*fTAlph))*u |
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242 | + 4*fDy1*(fa1md1*fdeltaY - 4*fdeltaX*fDy1 |
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243 | + 4*fdeltaY*fDy1*fTAlph)* std::cos(phi) |
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244 | - 4*fDy1*(fa1md1*fdeltaX + 4*fDy1*(fdeltaY |
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245 | + fdeltaX*fTAlph))*std::sin(phi))/ 8. ) ; |
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246 | return nvec.unit(); |
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247 | } |
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248 | |
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249 | #endif |
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