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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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"
33 #include "AliMUONConstants.h"
34 #include "AliMUONGeometryModule.h"
35 #include "AliMUONGeometryEnvelopeStore.h"
38 ClassImp(AliMUONSt1GeometryBuilder)
41 //______________________________________________________________________________
42 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder(AliMUON* muon)
43 : AliMUONVGeometryBuilder(0, 2),
46 /// Standard constructor
50 //______________________________________________________________________________
51 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder()
52 : AliMUONVGeometryBuilder(),
55 /// Default constructor
58 //______________________________________________________________________________
59 AliMUONSt1GeometryBuilder::~AliMUONSt1GeometryBuilder()
68 //______________________________________________________________________________
69 void AliMUONSt1GeometryBuilder::CreateGeometry()
71 /// From AliMUONv1::CreateGeometry()
73 //********************************************************************
75 //********************************************************************
77 // indices 1 and 2 for first and second chambers in the station
78 // iChamber (first chamber) kept for other quanties than Z,
79 // assumed to be the same in both chambers
81 // Get tracking medias Ids
82 Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
83 Int_t idAir= idtmed[1100]; // medium 1
84 Int_t idAlu1=idtmed[1103]; // medium 4
85 Int_t idAlu2=idtmed[1104]; // medium 5
86 Int_t idGas=idtmed[1108]; // medium 9 = Ar-CO2 gas (80%+20%)
87 Bool_t frameCrosses=kTRUE;
89 // Rotation matrices in the x-y plane
92 fMUON->AliMatrix(irot1, 90., 0., 90., 90., 0., 0.);
95 fMUON->AliMatrix(irot2, 90., 90., 90., 180., 0., 0.);
97 // DGas decreased from standard one (0.5)
98 const Float_t kDGas = 0.4;
100 // DAlu increased from standard one (3% of X0),
101 // because more electronics with smaller pads
102 const Float_t kDAlu = 3.5 * 8.9 / 100.;
104 // Half of the total thickness of frame crosses (including DAlu)
105 // for each chamber in stations 1 and 2:
106 // 3% of X0 of composite material,
107 // but taken as Aluminium here, with same thickness in number of X0
108 Float_t dframez = 3. * 8.9 / 100;
109 Float_t zfpos=-(kDGas+dframez+kDAlu)/2;
110 // The same parameters are defined in builder for station 2
113 // Outer excess and inner recess for mother volume radius
114 // with respect to ROuter and RInner
115 Float_t dframep=.001; // Value for station 3 should be 6 ...
116 // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
117 // Float_t dframep1=.001;
118 Float_t dframep1 = 11.0;
119 Float_t phi=2*TMath::Pi()/12/2;
120 // The same parameters are defined in builder for station 2
123 Float_t dstation = (-AliMUONConstants::DefaultChamberZ(1)) -
124 (-AliMUONConstants::DefaultChamberZ(0));
125 tpar[0] = AliMUONConstants::Rmin(0)-dframep;
126 tpar[1] = (AliMUONConstants::Rmax(0)+dframep)/TMath::Cos(phi);
127 tpar[2] = dstation/5;
129 gMC->Gsvolu("S01M", "TUBE", idAir, tpar, 3);
130 gMC->Gsvolu("S02M", "TUBE", idAir, tpar, 3);
133 //gMC->Gspos("S01M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
134 //gMC->Gspos("S02M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
136 GetEnvelopes(0)->AddEnvelope("S01M", 100, false);
137 GetEnvelopes(1)->AddEnvelope("S02M", 200, false);
140 // // Aluminium frames
142 // pgpar[0] = 360/12/2;
146 // pgpar[4] = -dframez/2;
147 // pgpar[5] = AliMUONConstants::Rmax(0);
148 // pgpar[6] = pgpar[5]+dframep1;
149 // pgpar[7] = +dframez/2;
150 // pgpar[8] = pgpar[5];
151 // pgpar[9] = pgpar[6];
152 // gMC->Gsvolu("S01O", "PGON", idAlu1, pgpar, 10);
153 // gMC->Gsvolu("S02O", "PGON", idAlu1, pgpar, 10);
154 // gMC->Gspos("S01O",1,"S01M", 0.,0.,-zfpos, 0,"ONLY");
155 // gMC->Gspos("S01O",2,"S01M", 0.,0.,+zfpos, 0,"ONLY");
156 // gMC->Gspos("S02O",1,"S02M", 0.,0.,-zfpos, 0,"ONLY");
157 // gMC->Gspos("S02O",2,"S02M", 0.,0.,+zfpos, 0,"ONLY");
160 // tpar[0]= AliMUONConstants::Rmin(0)-dframep1;
161 // tpar[1]= AliMUONConstants::Rmin(0);
162 // tpar[2]= dframez/2;
163 // gMC->Gsvolu("S01I", "TUBE", idAlu1, tpar, 3);
164 // gMC->Gsvolu("S02I", "TUBE", idAlu1, tpar, 3);
166 // gMC->Gspos("S01I",1,"S01M", 0.,0.,-zfpos, 0,"ONLY");
167 // gMC->Gspos("S01I",2,"S01M", 0.,0.,+zfpos, 0,"ONLY");
168 // gMC->Gspos("S02I",1,"S02M", 0.,0.,-zfpos, 0,"ONLY");
169 // gMC->Gspos("S02I",2,"S02M", 0.,0.,+zfpos, 0,"ONLY");
174 // security for inside mother volume
176 bpar[0] = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))
177 * TMath::Cos(TMath::ASin(dframep1 /
178 (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))))
180 bpar[1] = dframep1/2;
181 // total thickness will be (4 * bpar[2]) for each chamber,
182 // which has to be equal to (2 * dframez) - DAlu
183 bpar[2] = (2.0 * dframez - kDAlu) / 4.0;
184 gMC->Gsvolu("S01B", "BOX", idAlu1, bpar, 3);
185 gMC->Gsvolu("S02B", "BOX", idAlu1, bpar, 3);
187 gMC->Gspos("S01B",1,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
189 gMC->Gspos("S01B",2,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
191 gMC->Gspos("S01B",3,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
193 gMC->Gspos("S01B",4,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
195 gMC->Gspos("S01B",5,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
197 gMC->Gspos("S01B",6,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
199 gMC->Gspos("S01B",7,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
201 gMC->Gspos("S01B",8,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
204 gMC->Gspos("S02B",1,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
206 gMC->Gspos("S02B",2,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
208 gMC->Gspos("S02B",3,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
210 gMC->Gspos("S02B",4,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
212 gMC->Gspos("S02B",5,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
214 gMC->Gspos("S02B",6,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
216 gMC->Gspos("S02B",7,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
218 gMC->Gspos("S02B",8,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
222 // Chamber Material represented by Alu sheet
223 tpar[0]= AliMUONConstants::Rmin(0);
224 tpar[1]= AliMUONConstants::Rmax(0);
225 tpar[2] = (kDGas+kDAlu)/2;
226 gMC->Gsvolu("S01A", "TUBE", idAlu2, tpar, 3);
227 gMC->Gsvolu("S02A", "TUBE",idAlu2, tpar, 3);
228 gMC->Gspos("S01A", 1, "S01M", 0., 0., 0., 0, "ONLY");
229 gMC->Gspos("S02A", 1, "S02M", 0., 0., 0., 0, "ONLY");
234 gMC->Gsvolu("S01G", "TUBE", idGas, tpar, 3);
235 gMC->Gsvolu("S02G", "TUBE", idGas, tpar, 3);
236 gMC->Gspos("S01G", 1, "S01A", 0., 0., 0., 0, "ONLY");
237 gMC->Gspos("S02G", 1, "S02A", 0., 0., 0., 0, "ONLY");
239 // Frame Crosses to be placed inside gas
240 // NONE: chambers are sensitive everywhere
241 // if (frameCrosses) {
243 // dr = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0));
244 // bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
245 // bpar[1] = dframep1/2;
246 // bpar[2] = kDGas/2;
247 // gMC->Gsvolu("S01F", "BOX", idAlu1, bpar, 3);
248 // gMC->Gsvolu("S02F", "BOX", idAlu1, bpar, 3);
250 // gMC->Gspos("S01F",1,"S01G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
252 // gMC->Gspos("S01F",2,"S01G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
254 // gMC->Gspos("S01F",3,"S01G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
256 // gMC->Gspos("S01F",4,"S01G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
259 // gMC->Gspos("S02F",1,"S02G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
261 // gMC->Gspos("S02F",2,"S02G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
263 // gMC->Gspos("S02F",3,"S02G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
265 // gMC->Gspos("S02F",4,"S02G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
270 //______________________________________________________________________________
271 void AliMUONSt1GeometryBuilder::SetTransformations()
273 /// Define the transformations for the station2 chambers.
275 Double_t zpos1= - AliMUONConstants::DefaultChamberZ(0);
276 SetTranslation(0, TGeoTranslation(0., 0., zpos1));
278 Double_t zpos2 = - AliMUONConstants::DefaultChamberZ(1);
279 SetTranslation(0, TGeoTranslation(0., 0., zpos2));
282 //______________________________________________________________________________
283 void AliMUONSt1GeometryBuilder::SetSensitiveVolumes()
285 /// Define the sensitive volumes for station1 chambers.
287 GetGeometry(0)->SetSensitiveVolume("S01G");
288 GetGeometry(1)->SetSensitiveVolume("S02G");