1 /**************************************************************************
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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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8 * documentation strictly for non-commercial purposes is hereby granted *
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12 * about the suitability of this software for any purpose. It is *
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14 **************************************************************************/
18 // Class AliMUONSt1GeometryBuilder
19 // -------------------------------
20 // MUON Station1 coarse geometry construction class.
21 // Extracted from AliMUONv1
22 // by Ivana Hrivnacova, IPN Orsay
23 // Included in AliRoot 2004/01/23
25 #include <TVirtualMC.h>
26 #include <TGeoMatrix.h>
30 #include "AliMUONSt1GeometryBuilder.h"
32 #include "AliMUONConstants.h"
33 #include "AliMUONGeometryModule.h"
34 #include "AliMUONGeometryEnvelopeStore.h"
37 ClassImp(AliMUONSt1GeometryBuilder)
40 //______________________________________________________________________________
41 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder(AliMUON* muon)
42 : AliMUONVGeometryBuilder(0, 2),
45 /// Standard constructor
49 //______________________________________________________________________________
50 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder()
51 : AliMUONVGeometryBuilder(),
54 /// Default constructor
57 //______________________________________________________________________________
58 AliMUONSt1GeometryBuilder::~AliMUONSt1GeometryBuilder()
67 //______________________________________________________________________________
68 void AliMUONSt1GeometryBuilder::CreateGeometry()
70 /// From AliMUONv1::CreateGeometry()
72 //********************************************************************
74 //********************************************************************
76 // indices 1 and 2 for first and second chambers in the station
77 // iChamber (first chamber) kept for other quanties than Z,
78 // assumed to be the same in both chambers
80 // Get tracking medias Ids
81 Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
82 Int_t idAir= idtmed[1100]; // medium 1
83 Int_t idAlu1=idtmed[1103]; // medium 4
84 Int_t idAlu2=idtmed[1104]; // medium 5
85 Int_t idGas=idtmed[1108]; // medium 9 = Ar-CO2 gas (80%+20%)
86 Bool_t frameCrosses=kTRUE;
88 // Rotation matrices in the x-y plane
91 fMUON->AliMatrix(irot1, 90., 0., 90., 90., 0., 0.);
94 fMUON->AliMatrix(irot2, 90., 90., 90., 180., 0., 0.);
96 // DGas decreased from standard one (0.5)
97 const Float_t kDGas = 0.4;
99 // DAlu increased from standard one (3% of X0),
100 // because more electronics with smaller pads
101 const Float_t kDAlu = 3.5 * 8.9 / 100.;
103 // Half of the total thickness of frame crosses (including DAlu)
104 // for each chamber in stations 1 and 2:
105 // 3% of X0 of composite material,
106 // but taken as Aluminium here, with same thickness in number of X0
107 Float_t dframez = 3. * 8.9 / 100;
108 Float_t zfpos=-(kDGas+dframez+kDAlu)/2;
109 // The same parameters are defined in builder for station 2
112 // Outer excess and inner recess for mother volume radius
113 // with respect to ROuter and RInner
114 Float_t dframep=.001; // Value for station 3 should be 6 ...
115 // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
116 // Float_t dframep1=.001;
117 Float_t dframep1 = 11.0;
118 Float_t phi=2*TMath::Pi()/12/2;
119 // The same parameters are defined in builder for station 2
122 Float_t dstation = (-AliMUONConstants::DefaultChamberZ(1)) -
123 (-AliMUONConstants::DefaultChamberZ(0));
124 tpar[0] = AliMUONConstants::Rmin(0)-dframep;
125 tpar[1] = (AliMUONConstants::Rmax(0)+dframep)/TMath::Cos(phi);
126 tpar[2] = dstation/5;
128 gMC->Gsvolu("S01M", "TUBE", idAir, tpar, 3);
129 gMC->Gsvolu("S02M", "TUBE", idAir, tpar, 3);
132 //gMC->Gspos("S01M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
133 //gMC->Gspos("S02M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
135 GetEnvelopes(0)->AddEnvelope("S01M", 100, false);
136 GetEnvelopes(1)->AddEnvelope("S02M", 200, false);
139 // // Aluminium frames
141 // pgpar[0] = 360/12/2;
145 // pgpar[4] = -dframez/2;
146 // pgpar[5] = AliMUONConstants::Rmax(0);
147 // pgpar[6] = pgpar[5]+dframep1;
148 // pgpar[7] = +dframez/2;
149 // pgpar[8] = pgpar[5];
150 // pgpar[9] = pgpar[6];
151 // gMC->Gsvolu("S01O", "PGON", idAlu1, pgpar, 10);
152 // gMC->Gsvolu("S02O", "PGON", idAlu1, pgpar, 10);
153 // gMC->Gspos("S01O",1,"S01M", 0.,0.,-zfpos, 0,"ONLY");
154 // gMC->Gspos("S01O",2,"S01M", 0.,0.,+zfpos, 0,"ONLY");
155 // gMC->Gspos("S02O",1,"S02M", 0.,0.,-zfpos, 0,"ONLY");
156 // gMC->Gspos("S02O",2,"S02M", 0.,0.,+zfpos, 0,"ONLY");
159 // tpar[0]= AliMUONConstants::Rmin(0)-dframep1;
160 // tpar[1]= AliMUONConstants::Rmin(0);
161 // tpar[2]= dframez/2;
162 // gMC->Gsvolu("S01I", "TUBE", idAlu1, tpar, 3);
163 // gMC->Gsvolu("S02I", "TUBE", idAlu1, tpar, 3);
165 // gMC->Gspos("S01I",1,"S01M", 0.,0.,-zfpos, 0,"ONLY");
166 // gMC->Gspos("S01I",2,"S01M", 0.,0.,+zfpos, 0,"ONLY");
167 // gMC->Gspos("S02I",1,"S02M", 0.,0.,-zfpos, 0,"ONLY");
168 // gMC->Gspos("S02I",2,"S02M", 0.,0.,+zfpos, 0,"ONLY");
173 // security for inside mother volume
175 bpar[0] = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))
176 * TMath::Cos(TMath::ASin(dframep1 /
177 (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))))
179 bpar[1] = dframep1/2;
180 // total thickness will be (4 * bpar[2]) for each chamber,
181 // which has to be equal to (2 * dframez) - DAlu
182 bpar[2] = (2.0 * dframez - kDAlu) / 4.0;
183 gMC->Gsvolu("S01B", "BOX", idAlu1, bpar, 3);
184 gMC->Gsvolu("S02B", "BOX", idAlu1, bpar, 3);
186 gMC->Gspos("S01B",1,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
188 gMC->Gspos("S01B",2,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
190 gMC->Gspos("S01B",3,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
192 gMC->Gspos("S01B",4,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
194 gMC->Gspos("S01B",5,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
196 gMC->Gspos("S01B",6,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
198 gMC->Gspos("S01B",7,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
200 gMC->Gspos("S01B",8,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
203 gMC->Gspos("S02B",1,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
205 gMC->Gspos("S02B",2,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
207 gMC->Gspos("S02B",3,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
209 gMC->Gspos("S02B",4,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
211 gMC->Gspos("S02B",5,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
213 gMC->Gspos("S02B",6,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
215 gMC->Gspos("S02B",7,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
217 gMC->Gspos("S02B",8,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
221 // Chamber Material represented by Alu sheet
222 tpar[0]= AliMUONConstants::Rmin(0);
223 tpar[1]= AliMUONConstants::Rmax(0);
224 tpar[2] = (kDGas+kDAlu)/2;
225 gMC->Gsvolu("S01A", "TUBE", idAlu2, tpar, 3);
226 gMC->Gsvolu("S02A", "TUBE",idAlu2, tpar, 3);
227 gMC->Gspos("S01A", 1, "S01M", 0., 0., 0., 0, "ONLY");
228 gMC->Gspos("S02A", 1, "S02M", 0., 0., 0., 0, "ONLY");
233 gMC->Gsvolu("S01G", "TUBE", idGas, tpar, 3);
234 gMC->Gsvolu("S02G", "TUBE", idGas, tpar, 3);
235 gMC->Gspos("S01G", 1, "S01A", 0., 0., 0., 0, "ONLY");
236 gMC->Gspos("S02G", 1, "S02A", 0., 0., 0., 0, "ONLY");
238 // Frame Crosses to be placed inside gas
239 // NONE: chambers are sensitive everywhere
240 // if (frameCrosses) {
242 // dr = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0));
243 // bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
244 // bpar[1] = dframep1/2;
245 // bpar[2] = kDGas/2;
246 // gMC->Gsvolu("S01F", "BOX", idAlu1, bpar, 3);
247 // gMC->Gsvolu("S02F", "BOX", idAlu1, bpar, 3);
249 // gMC->Gspos("S01F",1,"S01G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
251 // gMC->Gspos("S01F",2,"S01G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
253 // gMC->Gspos("S01F",3,"S01G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
255 // gMC->Gspos("S01F",4,"S01G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
258 // gMC->Gspos("S02F",1,"S02G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
260 // gMC->Gspos("S02F",2,"S02G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
262 // gMC->Gspos("S02F",3,"S02G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
264 // gMC->Gspos("S02F",4,"S02G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
269 //______________________________________________________________________________
270 void AliMUONSt1GeometryBuilder::SetTransformations()
272 /// Define the transformations for the station2 chambers.
274 Double_t zpos1= - AliMUONConstants::DefaultChamberZ(0);
275 SetTranslation(0, TGeoTranslation(0., 0., zpos1));
277 Double_t zpos2 = - AliMUONConstants::DefaultChamberZ(1);
278 SetTranslation(0, TGeoTranslation(0., 0., zpos2));
281 //______________________________________________________________________________
282 void AliMUONSt1GeometryBuilder::SetSensitiveVolumes()
284 /// Define the sensitive volumes for station1 chambers.
286 GetGeometry(0)->SetSensitiveVolume("S01G");
287 GetGeometry(1)->SetSensitiveVolume("S02G");