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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
16// $Id$
17//
18// Class AliMUONSt2GeometryBuilder
19// -------------------------------
20// MUON Station2 coarse geometry construction class.
21// Extracted from AliMUONv1
22// by Ivana Hrivnacova, IPN Orsay
23// Included in AliRoot 2004/01/23
24
25#include <TVirtualMC.h>
26#include <TGeoMatrix.h>
27
28#include "AliLog.h"
29
30#include "AliMUONSt2GeometryBuilder.h"
31#include "AliMUON.h"
32#include "AliMUONChamber.h"
33#include "AliMUONGeometryModule.h"
34#include "AliMUONGeometryEnvelopeStore.h"
35
36ClassImp(AliMUONSt2GeometryBuilder)
37
38//______________________________________________________________________________
39AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(AliMUON* muon)
40 : AliMUONVGeometryBuilder("st2.dat",
41 muon->Chamber(2).GetGeometry(),
42 muon->Chamber(3).GetGeometry()),
43 fMUON(muon)
44{
45// Standard constructor
46
47}
48
49//______________________________________________________________________________
50AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder()
51 : AliMUONVGeometryBuilder(),
52 fMUON(0)
53{
54// Default constructor
55}
56
57
58//______________________________________________________________________________
59AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(const AliMUONSt2GeometryBuilder& rhs)
60 : AliMUONVGeometryBuilder(rhs)
61{
62// Protected copy constructor
63
64 AliFatal("Copy constructor is not implemented.");
65}
66
67//______________________________________________________________________________
68AliMUONSt2GeometryBuilder::~AliMUONSt2GeometryBuilder() {
69//
70}
71
72//______________________________________________________________________________
73AliMUONSt2GeometryBuilder&
74AliMUONSt2GeometryBuilder::operator = (const AliMUONSt2GeometryBuilder& rhs)
75{
76// Protected assignement operator
77
78 // check assignement to self
79 if (this == &rhs) return *this;
80
81 AliFatal("Assignment operator is not implemented.");
82
83 return *this;
84}
85
86//
87// public methods
88//
89
90//______________________________________________________________________________
91void AliMUONSt2GeometryBuilder::CreateGeometry()
92{
93// From AliMUONv1::CreateGeometry()
94
95//
96//********************************************************************
97// Station 2 **
98//********************************************************************
99 // indices 1 and 2 for first and second chambers in the station
100 // iChamber (first chamber) kept for other quanties than Z,
101 // assumed to be the same in both chambers
102
103 // Get tracking medias Ids
104 Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
105 Int_t idAir= idtmed[1100]; // medium 1
106 Int_t idAlu1=idtmed[1103]; // medium 4
107 Int_t idAlu2=idtmed[1104]; // medium 5
108 Int_t idGas=idtmed[1108]; // medium 9 = Ar-CO2 gas (80%+20%)
109 Bool_t frameCrosses=kTRUE;
110
111 // Rotation matrices in the x-y plane
112 // phi= 0 deg
113 Int_t irot1;
114 fMUON->AliMatrix(irot1, 90., 0., 90., 90., 0., 0.);
115 // phi= 90 deg
116 Int_t irot2;
117 fMUON->AliMatrix(irot2, 90., 90., 90., 180., 0., 0.);
118
119 AliMUONChamber* iChamber = &fMUON->Chamber(2);
120 AliMUONChamber* iChamber1 = iChamber;
121 AliMUONChamber* iChamber2 = &fMUON->Chamber(3);
122
123 // Half of the total thickness of frame crosses (including DAlu)
124 // for each chamber in stations 1 and 2:
125 // 3% of X0 of composite material,
126 // but taken as Aluminium here, with same thickness in number of X0
127 Float_t dframez = 3. * 8.9 / 100;
128 // DGas and DAlu not changed from standard values
129 Double_t zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
130 // The same parameters are defined in builder for station 1
131
132 // Mother volume
133 // Outer excess and inner recess for mother volume radius
134 // with respect to ROuter and RInner
135 Float_t dframep=.001; // Value for station 3 should be 6 ...
136 // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
137 // Float_t dframep1=.001;
138 Float_t phi=2*TMath::Pi()/12/2;
139 // The same parameters are defined in builder for station 1
140
141 Float_t tpar[3];
142 Double_t dstation = (-iChamber2->Z()) - (-iChamber1->Z());
143 tpar[0] = iChamber->RInner()-dframep;
144 tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
145 tpar[2] = dstation/5;
146
147 gMC->Gsvolu("S03M", "TUBE", idAir, tpar, 3);
148 gMC->Gsvolu("S04M", "TUBE", idAir, tpar, 3);
149
150 // CHANGED
151 //gMC->Gspos("S03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
152 //gMC->Gspos("S04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
153
154 GetEnvelopes(2)->AddEnvelope("S03M", 300, false);
155 GetEnvelopes(3)->AddEnvelope("S04M", 400, false);
156
157 gMC->Gsbool("S03M", "L3DO");
158 gMC->Gsbool("S03M", "L3O1");
159 gMC->Gsbool("S03M", "L3O2");
160 gMC->Gsbool("S04M", "L3DO");
161 gMC->Gsbool("S04M", "L3O1");
162 gMC->Gsbool("S04M", "L3O2");
163
164// // Aluminium frames
165// // Outer frames
166// pgpar[0] = 360/12/2;
167// pgpar[1] = 360.;
168// pgpar[2] = 12.;
169// pgpar[3] = 2;
170// pgpar[4] = -dframez/2;
171// pgpar[5] = iChamber->ROuter();
172// pgpar[6] = pgpar[5]+dframep;
173// pgpar[7] = +dframez/2;
174// pgpar[8] = pgpar[5];
175// pgpar[9] = pgpar[6];
176// gMC->Gsvolu("S03O", "PGON", idAlu1, pgpar, 10);
177// gMC->Gsvolu("S04O", "PGON", idAlu1, pgpar, 10);
178// gMC->Gspos("S03O",1,"S03M", 0.,0.,-zfpos, 0,"ONLY");
179// gMC->Gspos("S03O",2,"S03M", 0.,0.,+zfpos, 0,"ONLY");
180// gMC->Gspos("S04O",1,"S04M", 0.,0.,-zfpos, 0,"ONLY");
181// gMC->Gspos("S04O",2,"S04M", 0.,0.,+zfpos, 0,"ONLY");
182// //
183// // Inner frame
184// tpar[0]= iChamber->RInner()-dframep;
185// tpar[1]= iChamber->RInner();
186// tpar[2]= dframez/2;
187// gMC->Gsvolu("S03I", "TUBE", idAlu1, tpar, 3);
188// gMC->Gsvolu("S04I", "TUBE", idAlu1, tpar, 3);
189
190// gMC->Gspos("S03I",1,"S03M", 0.,0.,-zfpos, 0,"ONLY");
191// gMC->Gspos("S03I",2,"S03M", 0.,0.,+zfpos, 0,"ONLY");
192// gMC->Gspos("S04I",1,"S04M", 0.,0.,-zfpos, 0,"ONLY");
193// gMC->Gspos("S04I",2,"S04M", 0.,0.,+zfpos, 0,"ONLY");
194//
195// Frame Crosses
196 if (frameCrosses) {
197 // outside gas
198 // security for inside mother volume
199
200 // ADDED !! Repeated
201 Float_t dframep1 = 11.0;
202 Float_t dframez = 3. * 8.9 / 100;
203
204 Float_t bpar[3];
205 bpar[0] = (iChamber->ROuter() - iChamber->RInner())
206 * TMath::Cos(TMath::ASin(dframep1 /
207 (iChamber->ROuter() - iChamber->RInner())))
208 / 2.0;
209 bpar[1] = dframep1/2;
210 // total thickness will be (4 * bpar[2]) for each chamber,
211 // which has to be equal to (2 * dframez) - DAlu
212 bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
213 gMC->Gsvolu("S03B", "BOX", idAlu1, bpar, 3);
214 gMC->Gsvolu("S04B", "BOX", idAlu1, bpar, 3);
215
216 gMC->Gspos("S03B",1,"S03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
217 irot1,"ONLY");
218 gMC->Gspos("S03B",2,"S03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
219 irot1,"ONLY");
220 gMC->Gspos("S03B",3,"S03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
221 irot2,"ONLY");
222 gMC->Gspos("S03B",4,"S03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
223 irot2,"ONLY");
224 gMC->Gspos("S03B",5,"S03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
225 irot1,"ONLY");
226 gMC->Gspos("S03B",6,"S03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
227 irot1,"ONLY");
228 gMC->Gspos("S03B",7,"S03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
229 irot2,"ONLY");
230 gMC->Gspos("S03B",8,"S03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
231 irot2,"ONLY");
232
233 gMC->Gspos("S04B",1,"S04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
234 irot1,"ONLY");
235 gMC->Gspos("S04B",2,"S04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
236 irot1,"ONLY");
237 gMC->Gspos("S04B",3,"S04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
238 irot2,"ONLY");
239 gMC->Gspos("S04B",4,"S04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
240 irot2,"ONLY");
241 gMC->Gspos("S04B",5,"S04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
242 irot1,"ONLY");
243 gMC->Gspos("S04B",6,"S04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
244 irot1,"ONLY");
245 gMC->Gspos("S04B",7,"S04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
246 irot2,"ONLY");
247 gMC->Gspos("S04B",8,"S04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
248 irot2,"ONLY");
249 }
250//
251// Chamber Material represented by Alu sheet
252 tpar[0]= iChamber->RInner();
253 tpar[1]= iChamber->ROuter();
254 tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
255 gMC->Gsvolu("S03A", "TUBE", idAlu2, tpar, 3);
256 gMC->Gsvolu("S04A", "TUBE", idAlu2, tpar, 3);
257 gMC->Gspos("S03A", 1, "S03M", 0., 0., 0., 0, "ONLY");
258 gMC->Gspos("S04A", 1, "S04M", 0., 0., 0., 0, "ONLY");
259//
260// Sensitive volumes
261 // tpar[2] = iChamber->DGas();
262 tpar[2] = iChamber->DGas()/2;
263 gMC->Gsvolu("S03G", "TUBE", idGas, tpar, 3);
264 gMC->Gsvolu("S04G", "TUBE", idGas, tpar, 3);
265 gMC->Gspos("S03G", 1, "S03A", 0., 0., 0., 0, "ONLY");
266 gMC->Gspos("S04G", 1, "S04A", 0., 0., 0., 0, "ONLY");
267//
268// Frame Crosses to be placed inside gas
269 // NONE: chambers are sensitive everywhere
270// if (frameCrosses) {
271
272// dr = (iChamber->ROuter() - iChamber->RInner());
273// bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
274// bpar[1] = dframep1/2;
275// bpar[2] = iChamber->DGas()/2;
276// gMC->Gsvolu("S03F", "BOX", idAlu1, bpar, 3);
277// gMC->Gsvolu("S04F", "BOX", idAlu1, bpar, 3);
278
279// gMC->Gspos("S03F",1,"S03G", +iChamber->RInner()+bpar[0] , 0, 0,
280// irot1,"ONLY");
281// gMC->Gspos("S03F",2,"S03G", -iChamber->RInner()-bpar[0] , 0, 0,
282// irot1,"ONLY");
283// gMC->Gspos("S03F",3,"S03G", 0, +iChamber->RInner()+bpar[0] , 0,
284// irot2,"ONLY");
285// gMC->Gspos("S03F",4,"S03G", 0, -iChamber->RInner()-bpar[0] , 0,
286// irot2,"ONLY");
287
288// gMC->Gspos("S04F",1,"S04G", +iChamber->RInner()+bpar[0] , 0, 0,
289// irot1,"ONLY");
290// gMC->Gspos("S04F",2,"S04G", -iChamber->RInner()-bpar[0] , 0, 0,
291// irot1,"ONLY");
292// gMC->Gspos("S04F",3,"S04G", 0, +iChamber->RInner()+bpar[0] , 0,
293// irot2,"ONLY");
294// gMC->Gspos("S04F",4,"S04G", 0, -iChamber->RInner()-bpar[0] , 0,
295// irot2,"ONLY");
296// }
297/*
298 iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[2];
299 iChamber2 =(AliMUONChamber*) (*fChambers)[3];
300 zpos1=iChamber1->Z();
301 zpos2=iChamber2->Z();
302 dstation = zpos2 - zpos1;
303 // DGas and DAlu not changed from standard values
304 zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
305
306//
307// Mother volume
308 tpar[0] = iChamber->RInner()-dframep;
309 tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
310 tpar[2] = dstation/5;
311
312 gMC->Gsvolu("S03M", "TUBE", idAir, tpar, 3);
313 gMC->Gsvolu("S04M", "TUBE", idAir, tpar, 3);
314 gMC->Gspos("S03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
315 gMC->Gspos("S04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
316 gMC->Gsbool("S03M", "L3DO");
317 gMC->Gsbool("S03M", "L3O1");
318 gMC->Gsbool("S03M", "L3O2");
319 gMC->Gsbool("S04M", "L3DO");
320 gMC->Gsbool("S04M", "L3O1");
321 gMC->Gsbool("S04M", "L3O2");
322
323// // Aluminium frames
324// // Outer frames
325// pgpar[0] = 360/12/2;
326// pgpar[1] = 360.;
327// pgpar[2] = 12.;
328// pgpar[3] = 2;
329// pgpar[4] = -dframez/2;
330// pgpar[5] = iChamber->ROuter();
331// pgpar[6] = pgpar[5]+dframep;
332// pgpar[7] = +dframez/2;
333// pgpar[8] = pgpar[5];
334// pgpar[9] = pgpar[6];
335// gMC->Gsvolu("S03O", "PGON", idAlu1, pgpar, 10);
336// gMC->Gsvolu("S04O", "PGON", idAlu1, pgpar, 10);
337// gMC->Gspos("S03O",1,"S03M", 0.,0.,-zfpos, 0,"ONLY");
338// gMC->Gspos("S03O",2,"S03M", 0.,0.,+zfpos, 0,"ONLY");
339// gMC->Gspos("S04O",1,"S04M", 0.,0.,-zfpos, 0,"ONLY");
340// gMC->Gspos("S04O",2,"S04M", 0.,0.,+zfpos, 0,"ONLY");
341// //
342// // Inner frame
343// tpar[0]= iChamber->RInner()-dframep;
344// tpar[1]= iChamber->RInner();
345// tpar[2]= dframez/2;
346// gMC->Gsvolu("S03I", "TUBE", idAlu1, tpar, 3);
347// gMC->Gsvolu("S04I", "TUBE", idAlu1, tpar, 3);
348
349// gMC->Gspos("S03I",1,"S03M", 0.,0.,-zfpos, 0,"ONLY");
350// gMC->Gspos("S03I",2,"S03M", 0.,0.,+zfpos, 0,"ONLY");
351// gMC->Gspos("S04I",1,"S04M", 0.,0.,-zfpos, 0,"ONLY");
352// gMC->Gspos("S04I",2,"S04M", 0.,0.,+zfpos, 0,"ONLY");
353//
354// Frame Crosses
355 if (frameCrosses) {
356 // outside gas
357 // security for inside mother volume
358 bpar[0] = (iChamber->ROuter() - iChamber->RInner())
359 * TMath::Cos(TMath::ASin(dframep1 /
360 (iChamber->ROuter() - iChamber->RInner())))
361 / 2.0;
362 bpar[1] = dframep1/2;
363 // total thickness will be (4 * bpar[2]) for each chamber,
364 // which has to be equal to (2 * dframez) - DAlu
365 bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
366 gMC->Gsvolu("S03B", "BOX", idAlu1, bpar, 3);
367 gMC->Gsvolu("S04B", "BOX", idAlu1, bpar, 3);
368
369 gMC->Gspos("S03B",1,"S03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
370 irot1,"ONLY");
371 gMC->Gspos("S03B",2,"S03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
372 irot1,"ONLY");
373 gMC->Gspos("S03B",3,"S03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
374 irot2,"ONLY");
375 gMC->Gspos("S03B",4,"S03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
376 irot2,"ONLY");
377 gMC->Gspos("S03B",5,"S03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
378 irot1,"ONLY");
379 gMC->Gspos("S03B",6,"S03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
380 irot1,"ONLY");
381 gMC->Gspos("S03B",7,"S03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
382 irot2,"ONLY");
383 gMC->Gspos("S03B",8,"S03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
384 irot2,"ONLY");
385
386 gMC->Gspos("S04B",1,"S04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
387 irot1,"ONLY");
388 gMC->Gspos("S04B",2,"S04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
389 irot1,"ONLY");
390 gMC->Gspos("S04B",3,"S04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
391 irot2,"ONLY");
392 gMC->Gspos("S04B",4,"S04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
393 irot2,"ONLY");
394 gMC->Gspos("S04B",5,"S04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
395 irot1,"ONLY");
396 gMC->Gspos("S04B",6,"S04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
397 irot1,"ONLY");
398 gMC->Gspos("S04B",7,"S04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
399 irot2,"ONLY");
400 gMC->Gspos("S04B",8,"S04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
401 irot2,"ONLY");
402 }
403//
404// Chamber Material represented by Alu sheet
405 tpar[0]= iChamber->RInner();
406 tpar[1]= iChamber->ROuter();
407 tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
408 gMC->Gsvolu("S03A", "TUBE", idAlu2, tpar, 3);
409 gMC->Gsvolu("S04A", "TUBE", idAlu2, tpar, 3);
410 gMC->Gspos("S03A", 1, "S03M", 0., 0., 0., 0, "ONLY");
411 gMC->Gspos("S04A", 1, "S04M", 0., 0., 0., 0, "ONLY");
412//
413// Sensitive volumes
414 // tpar[2] = iChamber->DGas();
415 tpar[2] = iChamber->DGas()/2;
416 gMC->Gsvolu("S03G", "TUBE", idGas, tpar, 3);
417 gMC->Gsvolu("S04G", "TUBE", idGas, tpar, 3);
418 gMC->Gspos("S03G", 1, "S03A", 0., 0., 0., 0, "ONLY");
419 gMC->Gspos("S04G", 1, "S04A", 0., 0., 0., 0, "ONLY");
420//
421// Frame Crosses to be placed inside gas
422 // NONE: chambers are sensitive everywhere
423// if (frameCrosses) {
424
425// dr = (iChamber->ROuter() - iChamber->RInner());
426// bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
427// bpar[1] = dframep1/2;
428// bpar[2] = iChamber->DGas()/2;
429// gMC->Gsvolu("S03F", "BOX", idAlu1, bpar, 3);
430// gMC->Gsvolu("S04F", "BOX", idAlu1, bpar, 3);
431
432// gMC->Gspos("S03F",1,"S03G", +iChamber->RInner()+bpar[0] , 0, 0,
433// irot1,"ONLY");
434// gMC->Gspos("S03F",2,"S03G", -iChamber->RInner()-bpar[0] , 0, 0,
435// irot1,"ONLY");
436// gMC->Gspos("S03F",3,"S03G", 0, +iChamber->RInner()+bpar[0] , 0,
437// irot2,"ONLY");
438// gMC->Gspos("S03F",4,"S03G", 0, -iChamber->RInner()-bpar[0] , 0,
439// irot2,"ONLY");
440
441// gMC->Gspos("S04F",1,"S04G", +iChamber->RInner()+bpar[0] , 0, 0,
442// irot1,"ONLY");
443// gMC->Gspos("S04F",2,"S04G", -iChamber->RInner()-bpar[0] , 0, 0,
444// irot1,"ONLY");
445// gMC->Gspos("S04F",3,"S04G", 0, +iChamber->RInner()+bpar[0] , 0,
446// irot2,"ONLY");
447// gMC->Gspos("S04F",4,"S04G", 0, -iChamber->RInner()-bpar[0] , 0,
448// irot2,"ONLY");
449// }
450 }
451*/
452}
453
454//______________________________________________________________________________
455void AliMUONSt2GeometryBuilder::SetTransformations()
456{
457// Defines the transformations for the station2 chambers.
458// ---
459
460 AliMUONChamber* iChamber1 = &fMUON->Chamber(2);
461 Double_t zpos1 = - iChamber1->Z();
462 iChamber1->GetGeometry()
463 ->SetTranslation(TGeoTranslation(0., 0., zpos1));
464
465 AliMUONChamber* iChamber2 = &fMUON->Chamber(3);
466 Double_t zpos2 = - iChamber2->Z();
467 iChamber2->GetGeometry()
468 ->SetTranslation(TGeoTranslation(0., 0., zpos2));
469}
470
471//______________________________________________________________________________
472void AliMUONSt2GeometryBuilder::SetSensitiveVolumes()
473{
474// Defines the sensitive volumes for station2 chambers.
475// ---
476
477 GetGeometry(2)->SetSensitiveVolume("S03G");
478 GetGeometry(3)->SetSensitiveVolume("S04G");
479}