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 *
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 **************************************************************************/
18 Revision 1.9 2001/05/16 14:57:22 alibrary
19 New files for folders and Stack
21 Revision 1.8 2001/01/12 13:16:09 morsch
22 Store absorber composition information in fMLayers and fZLayers
23 Rear 25 cm Fe + 35 cm Cu
25 Revision 1.7 2000/10/02 21:28:15 fca
26 Removal of useless dependecies via forward declarations
28 Revision 1.6 2000/06/15 09:40:31 morsch
29 Obsolete typedef keyword removed
31 Revision 1.5 2000/06/12 19:39:01 morsch
32 New structure of beam pipe and heating jacket.
34 Revision 1.4 2000/04/03 08:13:40 fca
35 Introduce extra scope for non ANSI compliant C++ compilers
37 Revision 1.3 2000/01/18 17:49:56 morsch
38 Serious overlap of ABSM with shield corrected
39 Small error in ARPB parameters corrected
41 Revision 1.2 2000/01/13 11:23:59 morsch
42 Last layer of Pb outer angle corrected
44 Revision 1.1 2000/01/12 15:39:30 morsch
45 Standard version of ABSO
49 ///////////////////////////////////////////////////////////////////////////////
52 // This class contains the description of the muon absorber geometry //
56 <img src="picts/AliABSOClass.gif">
59 <font size=+2 color=red>
60 <p>The responsible person for this module is
61 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
68 ///////////////////////////////////////////////////////////////////////////////
70 #include "AliABSOv0.h"
77 //_____________________________________________________________________________
78 AliABSOv0::AliABSOv0()
81 // Default constructor
85 //_____________________________________________________________________________
86 AliABSOv0::AliABSOv0(const char *name, const char *title)
90 // Standard constructor
97 //_____________________________________________________________________________
98 void AliABSOv0::CreateGeometry()
101 // Creation of the geometry of the muon absorber
105 <img src="picts/AliABSOv0Tree.gif">
110 <img src="picts/AliABSOv0.gif">
117 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
118 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
119 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
121 Int_t *idtmed = fIdtmed->GetArray()-1599;
123 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
125 #include "ABSOSHILConst.h"
126 #include "ABSOConst.h"
128 // Structure of Tracking Region
134 fMLayers[0][0] = kAir; fZLayers[0][0] = zAbsStart;
135 fMLayers[0][1] = kC; fZLayers[0][1] = zAbsCc;
136 fMLayers[0][2] = kConcrete; fZLayers[0][2] = zRear-dRear-dzFe;
137 fMLayers[0][3] = kSteel; fZLayers[0][3] = zRear-dRear;
138 fMLayers[0][4] = kCu; fZLayers[0][4] = zRear;
141 fMLayers[1][0] = fMLayers[0][0]; fZLayers[1][0] = fZLayers[0][0];
142 fMLayers[1][1] = fMLayers[0][1]; fZLayers[1][1] = fZLayers[0][1];
143 fMLayers[1][2] = fMLayers[0][2]; fZLayers[1][2] = fZLayers[0][2];
144 fMLayers[1][3] = fMLayers[0][3]; fZLayers[1][3] = fZLayers[0][3];
145 fMLayers[1][4] = kNiCuW; fZLayers[1][4] = fZLayers[0][4];
148 Float_t dTube=0.1; // tube thickness
149 Float_t dInsu=0.5; // insulation thickness
150 Float_t dEnve=0.1; // protective envelope thickness
151 Float_t dFree=0.5; // clearance thickness
154 // Mother volume and outer shielding: Pb
159 par[3] = -(zRear-zAbsStart)/2.;
161 par[5] = zAbsStart * TMath::Tan(theta1);
163 par[6] = par[3]+(zNose-zAbsStart);
165 par[8] = zNose * TMath::Tan(theta1);
167 par[9] = par[3]+(zConeTPC-zAbsStart);
169 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(theta2);
171 par[12] = par[3]+(zOpen-zAbsStart);
173 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(accMax);
175 par[15] = par[3]+(zRear-dRear-zAbsStart);
176 par[16] = rAbs + (par[15] - par[12]) * TMath::Tan(thetaOpen1) ;
177 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(accMax);
179 par[18] = par[3]+(zRear-dRear-zAbsStart);
180 par[19] = (zRear-dRear) * TMath::Tan(accMin);
181 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(accMax);
184 par[22] = zRear* TMath::Tan(accMin);
185 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(accMax);
186 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
187 { // Begin local scope for i
188 for (Int_t i=4; i<18; i+=3) par[i] = 0;
189 } // End local scope for i
190 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
191 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
196 par[4] = par[5] -dSteel;
197 par[7] = par[8] -dSteel;
198 par[10]= par[11]-dSteel;
199 par[13]= par[14]-dSteel;
200 par[16]= par[17]-dSteel;
201 par[19]= par[20]-dSteel;
202 par[22]= par[23]-dSteel;
203 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
204 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
206 // Polyethylene shield
208 cpar[0] = (zRear - zConeTPC) / 2.;
209 cpar[1] = zConeTPC * TMath::Tan(accMax);
210 cpar[2] = cpar[1] + dPoly;
211 cpar[3] = zRear * TMath::Tan(accMax);
212 cpar[4] = cpar[3] + dPoly;
213 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
214 dz = (zRear-zAbsStart)/2.-cpar[0];
215 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
218 // Tungsten nose to protect TPC
220 cpar[0] = (zNose - zAbsStart) / 2.;
221 cpar[1] = zAbsStart * TMath::Tan(accMax);
222 cpar[2] = zAbsStart * TMath::Tan(theta1)-dSteel;
223 cpar[3] = zNose * TMath::Tan(accMax);
224 cpar[4] = zNose * TMath::Tan(theta1)-dSteel;
225 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
227 dz = -(zRear-zAbsStart)/2.+cpar[0];
228 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
230 // Tungsten inner shield
232 Float_t zW=zTwoDeg+.1;
233 Float_t dZ = zW+(zRear-dRear-zW)/2.;
240 pcpar[5] = zW * TMath::Tan(accMin);
243 pcpar[8] = zOpen * TMath::Tan(accMin);
244 pcpar[9] = zRear-dRear-dZ;
245 pcpar[10] = rAbs+(zRear-dRear-zOpen) * TMath::Tan(thetaOpen1);
246 pcpar[11] = (zRear-dRear) * TMath::Tan(accMin);
248 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
250 dz=(zW+zRear-dRear)/2-(zAbsStart+zRear)/2.;
251 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
253 // Inner tracking region
260 pcpar[3] = -(zRear-zAbsStart)/2.;
262 pcpar[5] = zAbsStart * TMath::Tan(accMax);
263 pcpar[6] = pcpar[3]+(zTwoDeg-zAbsStart);
265 pcpar[8] = zTwoDeg * TMath::Tan(accMax);
266 pcpar[9] = -pcpar[3];
267 pcpar[10] = zRear * TMath::Tan(accMin);
268 pcpar[11] = zRear * TMath::Tan(accMax);
269 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
271 // special Pb medium for last 5 cm of Pb
272 Float_t zr=zRear-2.-0.001;
274 cpar[1] = zr * TMath::Tan(thetaR);
275 cpar[2] = zr * TMath::Tan(accMax);
276 cpar[3] = cpar[1] + TMath::Tan(thetaR) * 2;
277 cpar[4] = cpar[2] + TMath::Tan(accMax) * 2;
278 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
279 dz=(zRear-zAbsStart)/2.-cpar[0]-0.001;
280 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
282 // concrete cone: concrete
284 pcpar[9] = pcpar[3]+(zRear-dRear-zAbsStart);
285 pcpar[10] = (zRear-dRear) * TMath::Tan(accMin);
286 pcpar[11] = (zRear-dRear) * TMath::Tan(accMax);
287 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
288 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
292 zr = zRear-dRear-dzFe;
294 cpar[1] = zr * TMath::Tan(accMin);
295 cpar[2] = zr * TMath::Tan(accMax);
296 cpar[3] = cpar[1] + TMath::Tan(accMin) * dzFe;
297 cpar[4] = cpar[2] + TMath::Tan(accMax) * dzFe;
298 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
300 dz = (zRear-zAbsStart)/2.-dRear-dzFe/2.;
302 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
307 // carbon cone: carbon
309 pcpar[9] = pcpar[3]+(zAbsCc-zAbsStart);
310 pcpar[10] = zAbsCc * TMath::Tan(accMin);
311 pcpar[11] = zAbsCc * TMath::Tan(accMax);
312 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
313 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
315 // carbon cone outer region
319 cpar[2] = zAbsStart* TMath::Tan(accMax);
321 cpar[4] = cpar[2]+2. * cpar[0] * TMath::Tan(accMax);
323 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
324 dz=-(zRear-zAbsStart)/2.+cpar[0];
325 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
331 zr=zRear-(dRear-epsi);
332 cpar[0] = (dRear-epsi)/2.;
333 cpar[1] = zr * TMath::Tan(accMin);
334 cpar[2] = zr * TMath::Tan(thetaR*repsi);
335 cpar[3] = cpar[1] + TMath::Tan(accMin) * (dRear-epsi);
336 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * (dRear-epsi);
337 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
338 dz=(zRear-zAbsStart)/2.-cpar[0];
339 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
341 // special W medium for last 5 cm of W
344 cpar[1] = zr * TMath::Tan(accMin);
345 cpar[2] = zr * TMath::Tan(thetaR*repsi);
346 cpar[3] = cpar[1] + TMath::Tan(accMin) * 5.;
347 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * 5.;
348 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
349 dz=(dRear-epsi)/2.-cpar[0];
350 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
353 Float_t drMin=TMath::Tan(thetaR) * 5;
354 Float_t drMax=TMath::Tan(accMax) * 5;
355 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
357 { // Begin local scope for i
358 for (Int_t i=0; i<3; i++) {
359 zr=zRear-dRear+5+i*10.;
360 cpar[1] = zr * TMath::Tan(thetaR);
361 cpar[2] = zr * TMath::Tan(accMax);
362 cpar[3] = cpar[1] + drMin;
363 cpar[4] = cpar[2] + drMax;
364 dz=(zRear-zAbsStart)/2.-cpar[0]-5.-(2-i)*10;
365 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
367 } // End local scope for i
368 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
369 dz = (zRear-zAbsStart)/2.+zAbsStart;
370 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
375 // pipe and heating jackets
379 tpar0[2]=(zOpen-zAbsStart)/2;
381 tpar0[1]=rVacu+dTube+dInsu+dEnve;
382 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
388 tpar[1]=tpar[0]+dInsu;
389 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
390 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
392 dz=-(zRear-zAbsStart)/2.+tpar0[2];
393 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
397 cpar0[0]=(zRear-dRear-zOpen)/2;
398 cpar0[1]= rVacu-0.05;
399 cpar0[2]= rVacu+dTube+dInsu+dEnve;
400 Float_t dR=2.*cpar0[0]*TMath::Tan(thetaOpen1);
401 cpar0[3]=cpar0[1]+dR;
402 cpar0[4]=cpar0[2]+dR;
403 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
409 cpar[1]=cpar0[1]+dTube;
410 cpar[2]=cpar0[1]+dTube+dInsu;
411 cpar[3]=cpar0[3]+dTube;
412 cpar[4]=cpar0[3]+dTube+dInsu;
413 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
414 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
416 dz=(zRear-zAbsStart)/2.-cpar0[0]-dRear;
417 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
442 gMC->Gsvolu("ASSS", "PCON", idtmed[kSteel], par, 25);
443 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
448 //_____________________________________________________________________________
450 void AliABSOv0::Init()
453 // Initialisation of the muon absorber after it has been built
457 printf("\n%s: ",ClassName());
458 for(i=0;i<35;i++) printf("*");
459 printf(" ABSOv0_INIT ");
460 for(i=0;i<35;i++) printf("*");
461 printf("\n%s: ",ClassName());
463 for(i=0;i<80;i++) printf("*");