1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
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11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 //-----------------------------------------------------------------------------
19 // Class AliMUONSt1GeometryBuilder
20 // -------------------------------
21 // MUON Station1 coarse geometry construction class.
22 // Extracted from AliMUONv1
23 // by Ivana Hrivnacova, IPN Orsay
24 // Included in AliRoot 2004/01/23
25 //-----------------------------------------------------------------------------
27 #include <TVirtualMC.h>
28 #include <TGeoMatrix.h>
32 #include "AliMUONSt1GeometryBuilder.h"
35 #include "AliMUONConstants.h"
36 #include "AliMUONGeometryModule.h"
37 #include "AliMUONGeometryEnvelopeStore.h"
40 ClassImp(AliMUONSt1GeometryBuilder)
43 //______________________________________________________________________________
44 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder(AliMUON* muon)
45 : AliMUONVGeometryBuilder(0, 2),
48 /// Standard constructor
52 //______________________________________________________________________________
53 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder()
54 : AliMUONVGeometryBuilder(),
57 /// Default constructor
60 //______________________________________________________________________________
61 AliMUONSt1GeometryBuilder::~AliMUONSt1GeometryBuilder()
70 //______________________________________________________________________________
71 void AliMUONSt1GeometryBuilder::CreateGeometry()
73 /// From AliMUONv1::CreateGeometry()
75 //********************************************************************
77 //********************************************************************
79 // indices 1 and 2 for first and second chambers in the station
80 // iChamber (first chamber) kept for other quanties than Z,
81 // assumed to be the same in both chambers
83 // Get tracking medias Ids
84 Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
85 Int_t idAir= idtmed[1100]; // medium 1
86 Int_t idAlu1=idtmed[1103]; // medium 4
87 Int_t idAlu2=idtmed[1104]; // medium 5
88 Int_t idGas=idtmed[1108]; // medium 9 = Ar-CO2 gas (80%+20%)
89 Bool_t frameCrosses=kTRUE;
91 // Rotation matrices in the x-y plane
94 fMUON->AliMatrix(irot1, 90., 0., 90., 90., 0., 0.);
97 fMUON->AliMatrix(irot2, 90., 90., 90., 180., 0., 0.);
99 // DGas decreased from standard one (0.5)
100 const Float_t kDGas = 0.4;
102 // DAlu increased from standard one (3% of X0),
103 // because more electronics with smaller pads
104 const Float_t kDAlu = 3.5 * 8.9 / 100.;
106 // Half of the total thickness of frame crosses (including DAlu)
107 // for each chamber in stations 1 and 2:
108 // 3% of X0 of composite material,
109 // but taken as Aluminium here, with same thickness in number of X0
110 Float_t dframez = 3. * 8.9 / 100;
111 Float_t zfpos=-(kDGas+dframez+kDAlu)/2;
112 // The same parameters are defined in builder for station 2
115 // Outer excess and inner recess for mother volume radius
116 // with respect to ROuter and RInner
117 Float_t dframep=.001; // Value for station 3 should be 6 ...
118 // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
119 // Float_t dframep1=.001;
120 Float_t dframep1 = 11.0;
121 Float_t phi=2*TMath::Pi()/12/2;
122 // The same parameters are defined in builder for station 2
125 Float_t dstation = (-AliMUONConstants::DefaultChamberZ(1)) -
126 (-AliMUONConstants::DefaultChamberZ(0));
127 tpar[0] = AliMUONConstants::Rmin(0)-dframep;
128 tpar[1] = (AliMUONConstants::Rmax(0)+dframep)/TMath::Cos(phi);
129 tpar[2] = dstation/5;
131 gMC->Gsvolu("S01M", "TUBE", idAir, tpar, 3);
132 gMC->Gsvolu("S02M", "TUBE", idAir, tpar, 3);
135 //gMC->Gspos("S01M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
136 //gMC->Gspos("S02M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
138 GetEnvelopes(0)->AddEnvelope("S01M", 100, false);
139 GetEnvelopes(1)->AddEnvelope("S02M", 200, false);
142 // // Aluminium frames
144 // pgpar[0] = 360/12/2;
148 // pgpar[4] = -dframez/2;
149 // pgpar[5] = AliMUONConstants::Rmax(0);
150 // pgpar[6] = pgpar[5]+dframep1;
151 // pgpar[7] = +dframez/2;
152 // pgpar[8] = pgpar[5];
153 // pgpar[9] = pgpar[6];
154 // gMC->Gsvolu("S01O", "PGON", idAlu1, pgpar, 10);
155 // gMC->Gsvolu("S02O", "PGON", idAlu1, pgpar, 10);
156 // gMC->Gspos("S01O",1,"S01M", 0.,0.,-zfpos, 0,"ONLY");
157 // gMC->Gspos("S01O",2,"S01M", 0.,0.,+zfpos, 0,"ONLY");
158 // gMC->Gspos("S02O",1,"S02M", 0.,0.,-zfpos, 0,"ONLY");
159 // gMC->Gspos("S02O",2,"S02M", 0.,0.,+zfpos, 0,"ONLY");
162 // tpar[0]= AliMUONConstants::Rmin(0)-dframep1;
163 // tpar[1]= AliMUONConstants::Rmin(0);
164 // tpar[2]= dframez/2;
165 // gMC->Gsvolu("S01I", "TUBE", idAlu1, tpar, 3);
166 // gMC->Gsvolu("S02I", "TUBE", idAlu1, tpar, 3);
168 // gMC->Gspos("S01I",1,"S01M", 0.,0.,-zfpos, 0,"ONLY");
169 // gMC->Gspos("S01I",2,"S01M", 0.,0.,+zfpos, 0,"ONLY");
170 // gMC->Gspos("S02I",1,"S02M", 0.,0.,-zfpos, 0,"ONLY");
171 // gMC->Gspos("S02I",2,"S02M", 0.,0.,+zfpos, 0,"ONLY");
176 // security for inside mother volume
178 bpar[0] = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))
179 * TMath::Cos(TMath::ASin(dframep1 /
180 (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))))
182 bpar[1] = dframep1/2;
183 // total thickness will be (4 * bpar[2]) for each chamber,
184 // which has to be equal to (2 * dframez) - DAlu
185 bpar[2] = (2.0 * dframez - kDAlu) / 4.0;
186 gMC->Gsvolu("S01B", "BOX", idAlu1, bpar, 3);
187 gMC->Gsvolu("S02B", "BOX", idAlu1, bpar, 3);
189 gMC->Gspos("S01B",1,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
191 gMC->Gspos("S01B",2,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
193 gMC->Gspos("S01B",3,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
195 gMC->Gspos("S01B",4,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
197 gMC->Gspos("S01B",5,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
199 gMC->Gspos("S01B",6,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
201 gMC->Gspos("S01B",7,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
203 gMC->Gspos("S01B",8,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
206 gMC->Gspos("S02B",1,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
208 gMC->Gspos("S02B",2,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
210 gMC->Gspos("S02B",3,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
212 gMC->Gspos("S02B",4,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
214 gMC->Gspos("S02B",5,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
216 gMC->Gspos("S02B",6,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
218 gMC->Gspos("S02B",7,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
220 gMC->Gspos("S02B",8,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
224 // Chamber Material represented by Alu sheet
225 tpar[0]= AliMUONConstants::Rmin(0);
226 tpar[1]= AliMUONConstants::Rmax(0);
227 tpar[2] = (kDGas+kDAlu)/2;
228 gMC->Gsvolu("S01A", "TUBE", idAlu2, tpar, 3);
229 gMC->Gsvolu("S02A", "TUBE",idAlu2, tpar, 3);
230 gMC->Gspos("S01A", 1, "S01M", 0., 0., 0., 0, "ONLY");
231 gMC->Gspos("S02A", 1, "S02M", 0., 0., 0., 0, "ONLY");
236 gMC->Gsvolu("S01G", "TUBE", idGas, tpar, 3);
237 gMC->Gsvolu("S02G", "TUBE", idGas, tpar, 3);
238 gMC->Gspos("S01G", 1, "S01A", 0., 0., 0., 0, "ONLY");
239 gMC->Gspos("S02G", 1, "S02A", 0., 0., 0., 0, "ONLY");
241 // Frame Crosses to be placed inside gas
242 // NONE: chambers are sensitive everywhere
243 // if (frameCrosses) {
245 // dr = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0));
246 // bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
247 // bpar[1] = dframep1/2;
248 // bpar[2] = kDGas/2;
249 // gMC->Gsvolu("S01F", "BOX", idAlu1, bpar, 3);
250 // gMC->Gsvolu("S02F", "BOX", idAlu1, bpar, 3);
252 // gMC->Gspos("S01F",1,"S01G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
254 // gMC->Gspos("S01F",2,"S01G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
256 // gMC->Gspos("S01F",3,"S01G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
258 // gMC->Gspos("S01F",4,"S01G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
261 // gMC->Gspos("S02F",1,"S02G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
263 // gMC->Gspos("S02F",2,"S02G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
265 // gMC->Gspos("S02F",3,"S02G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
267 // gMC->Gspos("S02F",4,"S02G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
272 //______________________________________________________________________________
273 void AliMUONSt1GeometryBuilder::SetVolumes()
275 /// Define the volumes for the station2 chambers.
278 //______________________________________________________________________________
279 void AliMUONSt1GeometryBuilder::SetTransformations()
281 /// Define the transformations for the station2 chambers.
283 Double_t zpos1= - AliMUONConstants::DefaultChamberZ(0);
284 SetTranslation(0, TGeoTranslation(0., 0., zpos1));
286 Double_t zpos2 = - AliMUONConstants::DefaultChamberZ(1);
287 SetTranslation(0, TGeoTranslation(0., 0., zpos2));
290 //______________________________________________________________________________
291 void AliMUONSt1GeometryBuilder::SetSensitiveVolumes()
293 /// Define the sensitive volumes for station1 chambers.
295 GetGeometry(0)->SetSensitiveVolume("S01G");
296 GetGeometry(1)->SetSensitiveVolume("S02G");