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27 /// \file optical/LXe/src/LXeMainVolume.cc
28 /// \brief Implementation of the LXeMainVolume class
29 //
30 //
31 #include "LXeMainVolume.hh"
32
33 #include "G4Box.hh"
34 #include "G4Colour.hh"
35 #include "G4LogicalBorderSurface.hh"
36 #include "G4LogicalSkinSurface.hh"
37 #include "G4LogicalVolume.hh"
38 #include "G4Material.hh"
39 #include "G4MaterialPropertiesTable.hh"
40 #include "G4OpticalSurface.hh"
41 #include "G4Sphere.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "G4Tubs.hh"
44 #include "G4VisAttributes.hh"
45 #include "globals.hh"
46
47 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
48
49 LXeMainVolume::LXeMainVolume(G4RotationMatrix* pRot, const G4ThreeVector& tlate,
50 G4LogicalVolume* pMotherLogical, G4bool pMany, G4int pCopyNo,
51 LXeDetectorConstruction* c)
52 // Pass info to the G4PVPlacement constructor
53 : G4PVPlacement(
54 pRot, tlate,
55 // Temp logical volume must be created here
56 new G4LogicalVolume(new G4Box("temp", 1, 1, 1), G4Material::GetMaterial("Vacuum"), "temp"),
57 "housing", pMotherLogical, pMany, pCopyNo),
58 fConstructor(c)
59 {
60 CopyValues();
61
62 G4double housing_x = fScint_x + 2. * fD_mtl;
63 G4double housing_y = fScint_y + 2. * fD_mtl;
64 G4double housing_z = fScint_z + 2. * fD_mtl;
65
66 //*************************** housing and scintillator
67 fScint_box = new G4Box("scint_box", fScint_x / 2., fScint_y / 2., fScint_z / 2.);
68 fHousing_box = new G4Box("housing_box", housing_x / 2., housing_y / 2., housing_z / 2.);
69
70 fScint_log = new G4LogicalVolume(fScint_box, G4Material::GetMaterial("LXe"), "scint_log");
71 fHousing_log = new G4LogicalVolume(fHousing_box, G4Material::GetMaterial("Al"), "housing_log");
72
73 new G4PVPlacement(nullptr, G4ThreeVector(), fScint_log, "scintillator", fHousing_log, false, 0);
74
75 //*************** Miscellaneous sphere to demonstrate skin surfaces
76 fSphere = new G4Sphere("sphere", 0., 2. * cm, 0. * deg, 360. * deg, 0. * deg, 360. * deg);
77 fSphere_log = new G4LogicalVolume(fSphere, G4Material::GetMaterial("Al"), "sphere_log");
78 if (fSphereOn)
79 new G4PVPlacement(nullptr, G4ThreeVector(5. * cm, 5. * cm, 5. * cm), fSphere_log, "sphere",
80 fScint_log, false, 0);
81
82 //****************** Build PMTs
83 G4double innerRadius_pmt = 0.;
84 G4double height_pmt = fD_mtl / 2.;
85 G4double startAngle_pmt = 0.;
86 G4double spanningAngle_pmt = 360. * deg;
87
88 fPmt = new G4Tubs("pmt_tube", innerRadius_pmt, fOuterRadius_pmt, height_pmt, startAngle_pmt,
89 spanningAngle_pmt);
90
91 // the "photocathode" is a metal slab at the back of the glass that
92 // is only a very rough approximation of the real thing since it only
93 // absorbs or detects the photons based on the efficiency set below
94 fPhotocath = new G4Tubs("photocath_tube", innerRadius_pmt, fOuterRadius_pmt, height_pmt / 2.,
95 startAngle_pmt, spanningAngle_pmt);
96
97 fPmt_log = new G4LogicalVolume(fPmt, G4Material::GetMaterial("Glass"), "pmt_log");
98 fPhotocath_log = new G4LogicalVolume(fPhotocath, G4Material::GetMaterial("Al"), "photocath_log");
99
100 new G4PVPlacement(nullptr, G4ThreeVector(0., 0., -height_pmt / 2.), fPhotocath_log, "photocath",
101 fPmt_log, false, 0);
102
103 //***********Arrange pmts around the outside of housing**********
104
105 G4double dx = fScint_x / fNx;
106 G4double dy = fScint_y / fNy;
107 G4double dz = fScint_z / fNz;
108
109 G4double x, y, z;
110 G4double xmin = -fScint_x / 2. - dx / 2.;
111 G4double ymin = -fScint_y / 2. - dy / 2.;
112 G4double zmin = -fScint_z / 2. - dz / 2.;
113 G4int k = 0;
114
115 z = -fScint_z / 2. - height_pmt; // front
116 PlacePMTs(fPmt_log, nullptr, x, y, dx, dy, xmin, ymin, fNx, fNy, x, y, z, k);
117
118 auto rm_z = new G4RotationMatrix();
119 rm_z->rotateY(180. * deg);
120 z = fScint_z / 2. + height_pmt; // back
121 PlacePMTs(fPmt_log, rm_z, x, y, dx, dy, xmin, ymin, fNx, fNy, x, y, z, k);
122
123 auto rm_y1 = new G4RotationMatrix();
124 rm_y1->rotateY(-90. * deg);
125 x = -fScint_x / 2. - height_pmt; // left
126 PlacePMTs(fPmt_log, rm_y1, y, z, dy, dz, ymin, zmin, fNy, fNz, x, y, z, k);
127
128 auto rm_y2 = new G4RotationMatrix();
129 rm_y2->rotateY(90. * deg);
130 x = fScint_x / 2. + height_pmt; // right
131 PlacePMTs(fPmt_log, rm_y2, y, z, dy, dz, ymin, zmin, fNy, fNz, x, y, z, k);
132
133 auto rm_x1 = new G4RotationMatrix();
134 rm_x1->rotateX(90. * deg);
135 y = -fScint_y / 2. - height_pmt; // bottom
136 PlacePMTs(fPmt_log, rm_x1, x, z, dx, dz, xmin, zmin, fNx, fNz, x, y, z, k);
137
138 auto rm_x2 = new G4RotationMatrix();
139 rm_x2->rotateX(-90. * deg);
140 y = fScint_y / 2. + height_pmt; // top
141 PlacePMTs(fPmt_log, rm_x2, x, z, dx, dz, xmin, zmin, fNx, fNz, x, y, z, k);
142
143 VisAttributes();
144 SurfaceProperties();
145
146 SetLogicalVolume(fHousing_log);
147 }
148
149 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
150
151 void LXeMainVolume::CopyValues()
152 {
153 fScint_x = fConstructor->GetScintX();
154 fScint_y = fConstructor->GetScintY();
155 fScint_z = fConstructor->GetScintZ();
156 fD_mtl = fConstructor->GetHousingThickness();
157 fNx = fConstructor->GetNX();
158 fNy = fConstructor->GetNY();
159 fNz = fConstructor->GetNZ();
160 fOuterRadius_pmt = fConstructor->GetPMTRadius();
161 fSphereOn = fConstructor->GetSphereOn();
162 fRefl = fConstructor->GetHousingReflectivity();
163 }
164
165 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
166
167 void LXeMainVolume::PlacePMTs(G4LogicalVolume* pmt_log, G4RotationMatrix* rot, G4double& a,
168 G4double& b, G4double da, G4double db, G4double amin, G4double bmin,
169 G4int na, G4int nb, G4double& x, G4double& y, G4double& z, G4int& k)
170 {
171 /* PlacePMTs : a different way to parameterize placement that does not depend
172 * on calculating the position from the copy number
173 *
174 * pmt_log = logical volume for pmts to be placed
175 * rot = rotation matrix to apply
176 * a,b = coordinates to vary(ie. if varying in the xy plane then pass x,y)
177 * da,db = value to increment a,b by
178 * amin,bmin = start values for a,b
179 * na,nb = number of repitions in a and b
180 * x,y,z = just pass x,y, and z by reference (the same ones passed for a,b)
181 * k = copy number to start with
182 * sd = sensitive detector for pmts
183 */
184 a = amin;
185 for (G4int j = 1; j <= na; ++j) {
186 a += da;
187 b = bmin;
188 for (G4int i = 1; i <= nb; ++i) {
189 b += db;
190 new G4PVPlacement(rot, G4ThreeVector(x, y, z), pmt_log, "pmt", fHousing_log, false, k);
191 fPmtPositions.push_back(G4ThreeVector(x, y, z));
192 ++k;
193 }
194 }
195 }
196
197 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
198
199 void LXeMainVolume::VisAttributes()
200 {
201 auto housing_va = new G4VisAttributes(G4Colour(0.8, 0.8, 0.8));
202 fHousing_log->SetVisAttributes(housing_va);
203
204 auto sphere_va = new G4VisAttributes();
205 sphere_va->SetForceSolid(true);
206 fSphere_log->SetVisAttributes(sphere_va);
207 }
208
209 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
210
211 void LXeMainVolume::SurfaceProperties()
212 {
213 std::vector<G4double> ephoton = {7.0 * eV, 7.14 * eV};
214
215 //**Scintillator housing properties
216 std::vector<G4double> reflectivity = {fRefl, fRefl};
217 std::vector<G4double> efficiency = {0.0, 0.0};
218 auto scintHsngPT = new G4MaterialPropertiesTable();
219 scintHsngPT->AddProperty("REFLECTIVITY", ephoton, reflectivity);
220 scintHsngPT->AddProperty("EFFICIENCY", ephoton, efficiency);
221 auto OpScintHousingSurface =
222 new G4OpticalSurface("HousingSurface", unified, polished, dielectric_metal);
223 OpScintHousingSurface->SetMaterialPropertiesTable(scintHsngPT);
224
225 //**Sphere surface properties
226 std::vector<G4double> sphereReflectivity = {1.0, 1.0};
227 std::vector<G4double> sphereEfficiency = {0.0, 0.0};
228 auto spherePT = new G4MaterialPropertiesTable();
229 spherePT->AddProperty("REFLECTIVITY", ephoton, sphereReflectivity);
230 spherePT->AddProperty("EFFICIENCY", ephoton, sphereEfficiency);
231 auto OpSphereSurface = new G4OpticalSurface("SphereSurface", unified, polished, dielectric_metal);
232 OpSphereSurface->SetMaterialPropertiesTable(spherePT);
233
234 //**Photocathode surface properties
235 std::vector<G4double> photocath_EFF = {1., 1.};
236 std::vector<G4double> photocath_ReR = {1.92, 1.92};
237 std::vector<G4double> photocath_ImR = {1.69, 1.69};
238 auto photocath_mt = new G4MaterialPropertiesTable();
239 photocath_mt->AddProperty("EFFICIENCY", ephoton, photocath_EFF);
240 photocath_mt->AddProperty("REALRINDEX", ephoton, photocath_ReR);
241 photocath_mt->AddProperty("IMAGINARYRINDEX", ephoton, photocath_ImR);
242 auto photocath_opsurf =
243 new G4OpticalSurface("photocath_opsurf", glisur, polished, dielectric_metal);
244 photocath_opsurf->SetMaterialPropertiesTable(photocath_mt);
245
246 //**Create logical skin surfaces
247 new G4LogicalSkinSurface("photocath_surf", fHousing_log, OpScintHousingSurface);
248 new G4LogicalSkinSurface("sphere_surface", fSphere_log, OpSphereSurface);
249 new G4LogicalSkinSurface("photocath_surf", fPhotocath_log, photocath_opsurf);
250 }
251