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25 //
26 //
27 // --------------------------------------------------------------
28 // GEANT 4 - ULTRA experiment example
29 // --------------------------------------------------------------
30 //
31 // Code developed by:
32 // B. Tome, M.C. Espirito-Santo, A. Trindade, P. Rodrigues
33 //
34 // ****************************************************
35 // * UltraFresnelLens.cc
36 // ****************************************************
37 //
38 // Class for definition of the Ultra Fresnel Lens.
39 // An UltraFresnelLens object is created in the UltraDetectorConstruction class.
40 // This class makes use of the UltraFresnelLensParameterisation class.
41 // The lens profile is define through the GetSagita method.
42 //
43 #include <cmath>
44 #include "UltraFresnelLens.hh"
45 #include "UltraFresnelLensParameterisation.hh"
46
47 #include "G4PhysicalConstants.hh"
48 #include "G4SystemOfUnits.hh"
49 #include "G4Material.hh"
50 #include "G4MaterialTable.hh"
51 #include "G4Tubs.hh"
52 #include "G4Cons.hh"
53 #include "G4LogicalVolume.hh"
54 #include "G4PVPlacement.hh"
55 #include "G4PVParameterised.hh"
56 #include "G4ThreeVector.hh"
57 #include "G4VisAttributes.hh"
58
59 UltraFresnelLens::UltraFresnelLens(G4double Diameter, G4int nGrooves, G4Material* Material, G4VPhysicalVolume * MotherPV, G4ThreeVector Pos)
60 {
61
62 LensMaterial = Material ;
63 LensDiameter = Diameter ;
64 NumberOfGrooves = nGrooves;
65 GrooveWidth = (Diameter/2.0)/nGrooves ;
66 LensPosition = Pos ;
67
68 if( GrooveWidth <= 0 ){
69 G4Exception("UltraFresnelLens::UltraFresnelLens()","AirSh001",FatalException,
70 "UltraFresnelLens constructor: GrooveWidth<=0");
71 }
72
73
74 auto Rmin1 = (NumberOfGrooves-1)*(GrooveWidth) ;
75 auto Rmax1 = (NumberOfGrooves-0)*(GrooveWidth) ;
76 LensThickness = GetSagita(Rmax1)-GetSagita(Rmin1) ; // Height of the highest groove
77
78 BuildLens(MotherPV) ;
79
80 }
81
82
83 UltraFresnelLens::~UltraFresnelLens( )
84 {;}
85
86 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
87
88 void UltraFresnelLens::BuildLens(G4VPhysicalVolume *MotherPV){
89
90 auto StartPhi = 0.0 ;
91 auto DeltaPhi = twopi ;
92
93 auto LensMotherDz = LensThickness ;
94
95
96 auto LensMotherCylinder
97 = new G4Tubs("LensMotherCylinder",0.0*mm,LensDiameter/2.0,LensMotherDz/2.0,StartPhi,DeltaPhi);
98
99 auto LensMotherMaterial = MotherPV->GetLogicalVolume()->GetMaterial() ;
100 auto LensMotherLV
101 = new G4LogicalVolume(LensMotherCylinder,LensMotherMaterial,"LensMotherLV",0,0,0);
102 auto LensMotherPV
103 = new G4PVPlacement(0,LensPosition,"LensMotherPV",LensMotherLV,MotherPV,false,0);
104
105 LensMotherLV->SetVisAttributes (G4VisAttributes::GetInvisible());
106
107
108 auto solidGroove
109 = new G4Cons("Groove",40.0*mm,50.0*mm,40.0*mm,40.001*mm,1.0*mm,StartPhi,DeltaPhi);
110
111 auto logicalGroove
112 = new G4LogicalVolume(solidGroove,LensMaterial,"Groove_log",0,0,0);
113
114 auto FresnelLensParam = new UltraFresnelLensParameterisation(this);
115
116 LensPhysicalVolume =
117 new G4PVParameterised("LensPV",logicalGroove,LensMotherPV,kZAxis,NumberOfGrooves,FresnelLensParam) ;
118
119 }
120
121 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
122
123 G4double UltraFresnelLens::GetSagita(G4double radius)
124 {
125 auto Conic = -1.0;
126 auto Curvature = 0.00437636761488/mm ;
127 G4double Aspher[8] = {4.206739256e-05/(mm),
128 9.6440152e-10/(mm3),
129 -1.4884317e-15/(mm2*mm3),
130 0.0/(mm*mm3*mm3),
131 0.0/(mm3*mm3*mm3),
132 0.0/(mm2*mm3*mm3*mm3),
133 0.0/(mm*mm3*mm3*mm3*mm3),
134 0.0/(mm*3*mm3*mm3*mm3*mm3)
135 };
136
137 auto TotAspher = 0.0*mm ;
138
139 for(G4int k=1;k<9;k++){
140 TotAspher += Aspher[k-1]*std::pow(radius,2*k) ;
141 }
142
143 auto ArgSqrt = 1.0-(1.0+Conic)*std::pow(Curvature,2)*std::pow(radius,2) ;
144
145 if (ArgSqrt < 0.0){
146 G4Exception("UltraFresnelLens::GetSagita()","AirSh002",
147 FatalException,
148 "UltraFresnelLensParameterisation::Sagita: Square Root of <0 !");
149 }
150 auto Sagita_value = Curvature*std::pow(radius,2)/(1.0+std::sqrt(ArgSqrt)) + TotAspher;
151
152 return Sagita_value ;
153
154
155 }
156