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New parametrization of the geometry and new geometry interface (Working week effort)
[u/mrichter/AliRoot.git] / MUON / AliMUONSt2GeometryBuilder.cxx
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30178c30 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
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 **************************************************************************/
15
d1cd2474 16// $Id$
17//
18// Class AliMUONSt2GeometryBuilder
19// -------------------------------
5f1df83a 20// MUON Station2 coarse geometry construction class.
21// Extracted from AliMUONv1
22// by Ivana Hrivnacova, IPN Orsay
23// Included in AliRoot 2004/01/23
d1cd2474 24
25#include <TVirtualMC.h>
26#include <TGeoMatrix.h>
27
28#include "AliMUONSt2GeometryBuilder.h"
29#include "AliMUON.h"
30#include "AliMUONChamber.h"
31#include "AliMUONChamberGeometry.h"
a432117a 32#include "AliMUONGeometryEnvelopeStore.h"
d1cd2474 33
34ClassImp(AliMUONSt2GeometryBuilder)
35
36//______________________________________________________________________________
37AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(AliMUON* muon)
a432117a 38 : AliMUONVGeometryBuilder("st2.dat",
39 &muon->Chamber(2), &muon->Chamber(3)),
d1cd2474 40 fMUON(muon)
41{
42// Standard constructor
43
44}
45
46//______________________________________________________________________________
47AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder()
48 : AliMUONVGeometryBuilder(),
49 fMUON(0)
50{
51// Default constructor
52}
53
54
55//______________________________________________________________________________
56AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(const AliMUONSt2GeometryBuilder& rhs)
57 : AliMUONVGeometryBuilder(rhs)
58{
30178c30 59// Protected copy constructor
60
d1cd2474 61 Fatal("Copy constructor",
62 "Copy constructor is not implemented.");
63}
64
65//______________________________________________________________________________
66AliMUONSt2GeometryBuilder::~AliMUONSt2GeometryBuilder() {
67//
68}
69
70//______________________________________________________________________________
71AliMUONSt2GeometryBuilder&
72AliMUONSt2GeometryBuilder::operator = (const AliMUONSt2GeometryBuilder& rhs)
73{
30178c30 74// Protected assignement operator
75
d1cd2474 76 // check assignement to self
77 if (this == &rhs) return *this;
78
79 Fatal("operator=",
80 "Assignment operator is not implemented.");
81
82 return *this;
83}
84
85//
86// public methods
87//
88
89//______________________________________________________________________________
90void AliMUONSt2GeometryBuilder::CreateGeometry()
91{
92// From AliMUONv1::CreateGeometry()
93
94//
95//********************************************************************
96// Station 2 **
97//********************************************************************
98 // indices 1 and 2 for first and second chambers in the station
99 // iChamber (first chamber) kept for other quanties than Z,
100 // assumed to be the same in both chambers
101
102 // Get tracking medias Ids
103 Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
104 Int_t idAir= idtmed[1100]; // medium 1
105 Int_t idAlu1=idtmed[1103]; // medium 4
106 Int_t idAlu2=idtmed[1104]; // medium 5
107 Int_t idGas=idtmed[1108]; // medium 9 = Ar-CO2 gas (80%+20%)
108 Bool_t frameCrosses=kTRUE;
109
110 // Rotation matrices in the x-y plane
111 // phi= 0 deg
112 Int_t irot1;
113 fMUON->AliMatrix(irot1, 90., 0., 90., 90., 0., 0.);
114 // phi= 90 deg
115 Int_t irot2;
116 fMUON->AliMatrix(irot2, 90., 90., 90., 180., 0., 0.);
117
118 AliMUONChamber* iChamber = GetChamber(2);
119 AliMUONChamber* iChamber1 = iChamber;
120 AliMUONChamber* iChamber2 = GetChamber(3);
121
122 // Half of the total thickness of frame crosses (including DAlu)
123 // for each chamber in stations 1 and 2:
124 // 3% of X0 of composite material,
125 // but taken as Aluminium here, with same thickness in number of X0
126 Float_t dframez = 3. * 8.9 / 100;
127 // DGas and DAlu not changed from standard values
128 Double_t zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
129 // The same parameters are defined in builder for station 1
130
131 // Mother volume
132 // Outer excess and inner recess for mother volume radius
133 // with respect to ROuter and RInner
134 Float_t dframep=.001; // Value for station 3 should be 6 ...
135 // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
136 // Float_t dframep1=.001;
137 Float_t phi=2*TMath::Pi()/12/2;
138 // The same parameters are defined in builder for station 1
139
140 Float_t tpar[3];
141 Double_t dstation = (-iChamber2->Z()) - (-iChamber1->Z());
142 tpar[0] = iChamber->RInner()-dframep;
143 tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
144 tpar[2] = dstation/5;
145
146 gMC->Gsvolu("S03M", "TUBE", idAir, tpar, 3);
147 gMC->Gsvolu("S04M", "TUBE", idAir, tpar, 3);
148
149 // CHANGED
150 //gMC->Gspos("S03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
151 //gMC->Gspos("S04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
a432117a 152
153 GetEnvelopes(2)->AddEnvelope("S03M", 300, false);
154 GetEnvelopes(3)->AddEnvelope("S04M", 400, false);
d1cd2474 155
156 gMC->Gsbool("S03M", "L3DO");
157 gMC->Gsbool("S03M", "L3O1");
158 gMC->Gsbool("S03M", "L3O2");
159 gMC->Gsbool("S04M", "L3DO");
160 gMC->Gsbool("S04M", "L3O1");
161 gMC->Gsbool("S04M", "L3O2");
162
163// // Aluminium frames
164// // Outer frames
165// pgpar[0] = 360/12/2;
166// pgpar[1] = 360.;
167// pgpar[2] = 12.;
168// pgpar[3] = 2;
169// pgpar[4] = -dframez/2;
170// pgpar[5] = iChamber->ROuter();
171// pgpar[6] = pgpar[5]+dframep;
172// pgpar[7] = +dframez/2;
173// pgpar[8] = pgpar[5];
174// pgpar[9] = pgpar[6];
175// gMC->Gsvolu("S03O", "PGON", idAlu1, pgpar, 10);
176// gMC->Gsvolu("S04O", "PGON", idAlu1, pgpar, 10);
177// gMC->Gspos("S03O",1,"S03M", 0.,0.,-zfpos, 0,"ONLY");
178// gMC->Gspos("S03O",2,"S03M", 0.,0.,+zfpos, 0,"ONLY");
179// gMC->Gspos("S04O",1,"S04M", 0.,0.,-zfpos, 0,"ONLY");
180// gMC->Gspos("S04O",2,"S04M", 0.,0.,+zfpos, 0,"ONLY");
181// //
182// // Inner frame
183// tpar[0]= iChamber->RInner()-dframep;
184// tpar[1]= iChamber->RInner();
185// tpar[2]= dframez/2;
186// gMC->Gsvolu("S03I", "TUBE", idAlu1, tpar, 3);
187// gMC->Gsvolu("S04I", "TUBE", idAlu1, tpar, 3);
188
189// gMC->Gspos("S03I",1,"S03M", 0.,0.,-zfpos, 0,"ONLY");
190// gMC->Gspos("S03I",2,"S03M", 0.,0.,+zfpos, 0,"ONLY");
191// gMC->Gspos("S04I",1,"S04M", 0.,0.,-zfpos, 0,"ONLY");
192// gMC->Gspos("S04I",2,"S04M", 0.,0.,+zfpos, 0,"ONLY");
193//
194// Frame Crosses
195 if (frameCrosses) {
196 // outside gas
197 // security for inside mother volume
198
199 // ADDED !! Repeated
200 Float_t dframep1 = 11.0;
201 Float_t dframez = 3. * 8.9 / 100;
202
203 Float_t bpar[3];
204 bpar[0] = (iChamber->ROuter() - iChamber->RInner())
205 * TMath::Cos(TMath::ASin(dframep1 /
206 (iChamber->ROuter() - iChamber->RInner())))
207 / 2.0;
208 bpar[1] = dframep1/2;
209 // total thickness will be (4 * bpar[2]) for each chamber,
210 // which has to be equal to (2 * dframez) - DAlu
211 bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
212 gMC->Gsvolu("S03B", "BOX", idAlu1, bpar, 3);
213 gMC->Gsvolu("S04B", "BOX", idAlu1, bpar, 3);
214
215 gMC->Gspos("S03B",1,"S03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
216 irot1,"ONLY");
217 gMC->Gspos("S03B",2,"S03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
218 irot1,"ONLY");
219 gMC->Gspos("S03B",3,"S03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
220 irot2,"ONLY");
221 gMC->Gspos("S03B",4,"S03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
222 irot2,"ONLY");
223 gMC->Gspos("S03B",5,"S03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
224 irot1,"ONLY");
225 gMC->Gspos("S03B",6,"S03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
226 irot1,"ONLY");
227 gMC->Gspos("S03B",7,"S03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
228 irot2,"ONLY");
229 gMC->Gspos("S03B",8,"S03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
230 irot2,"ONLY");
231
232 gMC->Gspos("S04B",1,"S04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
233 irot1,"ONLY");
234 gMC->Gspos("S04B",2,"S04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
235 irot1,"ONLY");
236 gMC->Gspos("S04B",3,"S04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
237 irot2,"ONLY");
238 gMC->Gspos("S04B",4,"S04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
239 irot2,"ONLY");
240 gMC->Gspos("S04B",5,"S04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
241 irot1,"ONLY");
242 gMC->Gspos("S04B",6,"S04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
243 irot1,"ONLY");
244 gMC->Gspos("S04B",7,"S04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
245 irot2,"ONLY");
246 gMC->Gspos("S04B",8,"S04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
247 irot2,"ONLY");
248 }
249//
250// Chamber Material represented by Alu sheet
251 tpar[0]= iChamber->RInner();
252 tpar[1]= iChamber->ROuter();
253 tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
254 gMC->Gsvolu("S03A", "TUBE", idAlu2, tpar, 3);
255 gMC->Gsvolu("S04A", "TUBE", idAlu2, tpar, 3);
256 gMC->Gspos("S03A", 1, "S03M", 0., 0., 0., 0, "ONLY");
257 gMC->Gspos("S04A", 1, "S04M", 0., 0., 0., 0, "ONLY");
258//
259// Sensitive volumes
260 // tpar[2] = iChamber->DGas();
261 tpar[2] = iChamber->DGas()/2;
262 gMC->Gsvolu("S03G", "TUBE", idGas, tpar, 3);
263 gMC->Gsvolu("S04G", "TUBE", idGas, tpar, 3);
264 gMC->Gspos("S03G", 1, "S03A", 0., 0., 0., 0, "ONLY");
265 gMC->Gspos("S04G", 1, "S04A", 0., 0., 0., 0, "ONLY");
266//
267// Frame Crosses to be placed inside gas
268 // NONE: chambers are sensitive everywhere
269// if (frameCrosses) {
270
271// dr = (iChamber->ROuter() - iChamber->RInner());
272// bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
273// bpar[1] = dframep1/2;
274// bpar[2] = iChamber->DGas()/2;
275// gMC->Gsvolu("S03F", "BOX", idAlu1, bpar, 3);
276// gMC->Gsvolu("S04F", "BOX", idAlu1, bpar, 3);
277
278// gMC->Gspos("S03F",1,"S03G", +iChamber->RInner()+bpar[0] , 0, 0,
279// irot1,"ONLY");
280// gMC->Gspos("S03F",2,"S03G", -iChamber->RInner()-bpar[0] , 0, 0,
281// irot1,"ONLY");
282// gMC->Gspos("S03F",3,"S03G", 0, +iChamber->RInner()+bpar[0] , 0,
283// irot2,"ONLY");
284// gMC->Gspos("S03F",4,"S03G", 0, -iChamber->RInner()-bpar[0] , 0,
285// irot2,"ONLY");
286
287// gMC->Gspos("S04F",1,"S04G", +iChamber->RInner()+bpar[0] , 0, 0,
288// irot1,"ONLY");
289// gMC->Gspos("S04F",2,"S04G", -iChamber->RInner()-bpar[0] , 0, 0,
290// irot1,"ONLY");
291// gMC->Gspos("S04F",3,"S04G", 0, +iChamber->RInner()+bpar[0] , 0,
292// irot2,"ONLY");
293// gMC->Gspos("S04F",4,"S04G", 0, -iChamber->RInner()-bpar[0] , 0,
294// irot2,"ONLY");
295// }
296/*
297 iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[2];
298 iChamber2 =(AliMUONChamber*) (*fChambers)[3];
299 zpos1=iChamber1->Z();
300 zpos2=iChamber2->Z();
301 dstation = zpos2 - zpos1;
302 // DGas and DAlu not changed from standard values
303 zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
304
305//
306// Mother volume
307 tpar[0] = iChamber->RInner()-dframep;
308 tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
309 tpar[2] = dstation/5;
310
311 gMC->Gsvolu("S03M", "TUBE", idAir, tpar, 3);
312 gMC->Gsvolu("S04M", "TUBE", idAir, tpar, 3);
313 gMC->Gspos("S03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
314 gMC->Gspos("S04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
315 gMC->Gsbool("S03M", "L3DO");
316 gMC->Gsbool("S03M", "L3O1");
317 gMC->Gsbool("S03M", "L3O2");
318 gMC->Gsbool("S04M", "L3DO");
319 gMC->Gsbool("S04M", "L3O1");
320 gMC->Gsbool("S04M", "L3O2");
321
322// // Aluminium frames
323// // Outer frames
324// pgpar[0] = 360/12/2;
325// pgpar[1] = 360.;
326// pgpar[2] = 12.;
327// pgpar[3] = 2;
328// pgpar[4] = -dframez/2;
329// pgpar[5] = iChamber->ROuter();
330// pgpar[6] = pgpar[5]+dframep;
331// pgpar[7] = +dframez/2;
332// pgpar[8] = pgpar[5];
333// pgpar[9] = pgpar[6];
334// gMC->Gsvolu("S03O", "PGON", idAlu1, pgpar, 10);
335// gMC->Gsvolu("S04O", "PGON", idAlu1, pgpar, 10);
336// gMC->Gspos("S03O",1,"S03M", 0.,0.,-zfpos, 0,"ONLY");
337// gMC->Gspos("S03O",2,"S03M", 0.,0.,+zfpos, 0,"ONLY");
338// gMC->Gspos("S04O",1,"S04M", 0.,0.,-zfpos, 0,"ONLY");
339// gMC->Gspos("S04O",2,"S04M", 0.,0.,+zfpos, 0,"ONLY");
340// //
341// // Inner frame
342// tpar[0]= iChamber->RInner()-dframep;
343// tpar[1]= iChamber->RInner();
344// tpar[2]= dframez/2;
345// gMC->Gsvolu("S03I", "TUBE", idAlu1, tpar, 3);
346// gMC->Gsvolu("S04I", "TUBE", idAlu1, tpar, 3);
347
348// gMC->Gspos("S03I",1,"S03M", 0.,0.,-zfpos, 0,"ONLY");
349// gMC->Gspos("S03I",2,"S03M", 0.,0.,+zfpos, 0,"ONLY");
350// gMC->Gspos("S04I",1,"S04M", 0.,0.,-zfpos, 0,"ONLY");
351// gMC->Gspos("S04I",2,"S04M", 0.,0.,+zfpos, 0,"ONLY");
352//
353// Frame Crosses
354 if (frameCrosses) {
355 // outside gas
356 // security for inside mother volume
357 bpar[0] = (iChamber->ROuter() - iChamber->RInner())
358 * TMath::Cos(TMath::ASin(dframep1 /
359 (iChamber->ROuter() - iChamber->RInner())))
360 / 2.0;
361 bpar[1] = dframep1/2;
362 // total thickness will be (4 * bpar[2]) for each chamber,
363 // which has to be equal to (2 * dframez) - DAlu
364 bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
365 gMC->Gsvolu("S03B", "BOX", idAlu1, bpar, 3);
366 gMC->Gsvolu("S04B", "BOX", idAlu1, bpar, 3);
367
368 gMC->Gspos("S03B",1,"S03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
369 irot1,"ONLY");
370 gMC->Gspos("S03B",2,"S03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
371 irot1,"ONLY");
372 gMC->Gspos("S03B",3,"S03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
373 irot2,"ONLY");
374 gMC->Gspos("S03B",4,"S03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
375 irot2,"ONLY");
376 gMC->Gspos("S03B",5,"S03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
377 irot1,"ONLY");
378 gMC->Gspos("S03B",6,"S03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
379 irot1,"ONLY");
380 gMC->Gspos("S03B",7,"S03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
381 irot2,"ONLY");
382 gMC->Gspos("S03B",8,"S03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
383 irot2,"ONLY");
384
385 gMC->Gspos("S04B",1,"S04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
386 irot1,"ONLY");
387 gMC->Gspos("S04B",2,"S04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
388 irot1,"ONLY");
389 gMC->Gspos("S04B",3,"S04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
390 irot2,"ONLY");
391 gMC->Gspos("S04B",4,"S04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
392 irot2,"ONLY");
393 gMC->Gspos("S04B",5,"S04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
394 irot1,"ONLY");
395 gMC->Gspos("S04B",6,"S04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
396 irot1,"ONLY");
397 gMC->Gspos("S04B",7,"S04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
398 irot2,"ONLY");
399 gMC->Gspos("S04B",8,"S04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
400 irot2,"ONLY");
401 }
402//
403// Chamber Material represented by Alu sheet
404 tpar[0]= iChamber->RInner();
405 tpar[1]= iChamber->ROuter();
406 tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
407 gMC->Gsvolu("S03A", "TUBE", idAlu2, tpar, 3);
408 gMC->Gsvolu("S04A", "TUBE", idAlu2, tpar, 3);
409 gMC->Gspos("S03A", 1, "S03M", 0., 0., 0., 0, "ONLY");
410 gMC->Gspos("S04A", 1, "S04M", 0., 0., 0., 0, "ONLY");
411//
412// Sensitive volumes
413 // tpar[2] = iChamber->DGas();
414 tpar[2] = iChamber->DGas()/2;
415 gMC->Gsvolu("S03G", "TUBE", idGas, tpar, 3);
416 gMC->Gsvolu("S04G", "TUBE", idGas, tpar, 3);
417 gMC->Gspos("S03G", 1, "S03A", 0., 0., 0., 0, "ONLY");
418 gMC->Gspos("S04G", 1, "S04A", 0., 0., 0., 0, "ONLY");
419//
420// Frame Crosses to be placed inside gas
421 // NONE: chambers are sensitive everywhere
422// if (frameCrosses) {
423
424// dr = (iChamber->ROuter() - iChamber->RInner());
425// bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
426// bpar[1] = dframep1/2;
427// bpar[2] = iChamber->DGas()/2;
428// gMC->Gsvolu("S03F", "BOX", idAlu1, bpar, 3);
429// gMC->Gsvolu("S04F", "BOX", idAlu1, bpar, 3);
430
431// gMC->Gspos("S03F",1,"S03G", +iChamber->RInner()+bpar[0] , 0, 0,
432// irot1,"ONLY");
433// gMC->Gspos("S03F",2,"S03G", -iChamber->RInner()-bpar[0] , 0, 0,
434// irot1,"ONLY");
435// gMC->Gspos("S03F",3,"S03G", 0, +iChamber->RInner()+bpar[0] , 0,
436// irot2,"ONLY");
437// gMC->Gspos("S03F",4,"S03G", 0, -iChamber->RInner()-bpar[0] , 0,
438// irot2,"ONLY");
439
440// gMC->Gspos("S04F",1,"S04G", +iChamber->RInner()+bpar[0] , 0, 0,
441// irot1,"ONLY");
442// gMC->Gspos("S04F",2,"S04G", -iChamber->RInner()-bpar[0] , 0, 0,
443// irot1,"ONLY");
444// gMC->Gspos("S04F",3,"S04G", 0, +iChamber->RInner()+bpar[0] , 0,
445// irot2,"ONLY");
446// gMC->Gspos("S04F",4,"S04G", 0, -iChamber->RInner()-bpar[0] , 0,
447// irot2,"ONLY");
448// }
449 }
450*/
451}
452
453//______________________________________________________________________________
454void AliMUONSt2GeometryBuilder::SetTransformations()
455{
456// Defines the transformations for the station2 chambers.
457// ---
458
459 AliMUONChamber* iChamber1 = GetChamber(2);
460 Double_t zpos1 = - iChamber1->Z();
461 iChamber1->GetGeometry()
462 ->SetTranslation(TGeoTranslation(0., 0., zpos1));
463
464 AliMUONChamber* iChamber2 = GetChamber(3);
465 Double_t zpos2 = - iChamber2->Z();
466 iChamber2->GetGeometry()
467 ->SetTranslation(TGeoTranslation(0., 0., zpos2));
468}
469
470//______________________________________________________________________________
471void AliMUONSt2GeometryBuilder::SetSensitiveVolumes()
472{
473// Defines the sensitive volumes for station2 chambers.
474// ---
475
476 GetChamber(2)->GetGeometry()->SetSensitiveVolume("S03G");
477 GetChamber(3)->GetGeometry()->SetSensitiveVolume("S04G");
478}