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 1.8 2001/01/12 13:16:09 morsch
19 Store absorber composition information in fMLayers and fZLayers
20 Rear 25 cm Fe + 35 cm Cu
22 Revision 1.7 2000/10/02 21:28:15 fca
23 Removal of useless dependecies via forward declarations
25 Revision 1.6 2000/06/15 09:40:31 morsch
26 Obsolete typedef keyword removed
28 Revision 1.5 2000/06/12 19:39:01 morsch
29 New structure of beam pipe and heating jacket.
31 Revision 1.4 2000/04/03 08:13:40 fca
32 Introduce extra scope for non ANSI compliant C++ compilers
34 Revision 1.3 2000/01/18 17:49:56 morsch
35 Serious overlap of ABSM with shield corrected
36 Small error in ARPB parameters corrected
38 Revision 1.2 2000/01/13 11:23:59 morsch
39 Last layer of Pb outer angle corrected
41 Revision 1.1 2000/01/12 15:39:30 morsch
42 Standard version of ABSO
46 ///////////////////////////////////////////////////////////////////////////////
49 // This class contains the description of the muon absorber geometry //
53 <img src="picts/AliABSOClass.gif">
56 <font size=+2 color=red>
57 <p>The responsible person for this module is
58 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
65 ///////////////////////////////////////////////////////////////////////////////
67 #include "AliABSOv0.h"
74 //_____________________________________________________________________________
75 AliABSOv0::AliABSOv0()
78 // Default constructor
82 //_____________________________________________________________________________
83 AliABSOv0::AliABSOv0(const char *name, const char *title)
87 // Standard constructor
94 //_____________________________________________________________________________
95 void AliABSOv0::CreateGeometry()
98 // Creation of the geometry of the muon absorber
102 <img src="picts/AliABSOv0Tree.gif">
107 <img src="picts/AliABSOv0.gif">
114 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
115 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
116 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
118 Int_t *idtmed = fIdtmed->GetArray()-1599;
120 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
122 #include "ABSOSHILConst.h"
123 #include "ABSOConst.h"
125 // Structure of Tracking Region
131 fMLayers[0][0] = kAir; fZLayers[0][0] = zAbsStart;
132 fMLayers[0][1] = kC; fZLayers[0][1] = zAbsCc;
133 fMLayers[0][2] = kConcrete; fZLayers[0][2] = zRear-dRear-dzFe;
134 fMLayers[0][3] = kFe; fZLayers[0][3] = zRear-dRear;
135 fMLayers[0][4] = kCu; fZLayers[0][4] = zRear;
138 fMLayers[1][0] = fMLayers[0][0]; fZLayers[1][0] = fZLayers[0][0];
139 fMLayers[1][1] = fMLayers[0][1]; fZLayers[1][1] = fZLayers[0][1];
140 fMLayers[1][2] = fMLayers[0][2]; fZLayers[1][2] = fZLayers[0][2];
141 fMLayers[1][3] = fMLayers[0][3]; fZLayers[1][3] = fZLayers[0][3];
142 fMLayers[1][4] = kNiCuW; fZLayers[1][4] = fZLayers[0][4];
145 Float_t dTube=0.1; // tube thickness
146 Float_t dInsu=0.5; // insulation thickness
147 Float_t dEnve=0.1; // protective envelope thickness
148 Float_t dFree=0.5; // clearance thickness
151 // Mother volume and outer shielding: Pb
156 par[3] = -(zRear-zAbsStart)/2.;
158 par[5] = zAbsStart * TMath::Tan(theta1);
160 par[6] = par[3]+(zNose-zAbsStart);
162 par[8] = zNose * TMath::Tan(theta1);
164 par[9] = par[3]+(zConeTPC-zAbsStart);
166 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(theta2);
168 par[12] = par[3]+(zOpen-zAbsStart);
170 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(accMax);
172 par[15] = par[3]+(zRear-dRear-zAbsStart);
173 par[16] = rAbs + (par[15] - par[12]) * TMath::Tan(thetaOpen1) ;
174 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(accMax);
176 par[18] = par[3]+(zRear-dRear-zAbsStart);
177 par[19] = (zRear-dRear) * TMath::Tan(accMin);
178 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(accMax);
181 par[22] = zRear* TMath::Tan(accMin);
182 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(accMax);
183 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
184 { // Begin local scope for i
185 for (Int_t i=4; i<18; i+=3) par[i] = 0;
186 } // End local scope for i
187 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
188 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
193 par[4] = par[5] -dSteel;
194 par[7] = par[8] -dSteel;
195 par[10]= par[11]-dSteel;
196 par[13]= par[14]-dSteel;
197 par[16]= par[17]-dSteel;
198 par[19]= par[20]-dSteel;
199 par[22]= par[23]-dSteel;
200 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
201 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
203 // Polyethylene shield
205 cpar[0] = (zRear - zConeTPC) / 2.;
206 cpar[1] = zConeTPC * TMath::Tan(accMax);
207 cpar[2] = cpar[1] + dPoly;
208 cpar[3] = zRear * TMath::Tan(accMax);
209 cpar[4] = cpar[3] + dPoly;
210 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
211 dz = (zRear-zAbsStart)/2.-cpar[0];
212 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
215 // Tungsten nose to protect TPC
217 cpar[0] = (zNose - zAbsStart) / 2.;
218 cpar[1] = zAbsStart * TMath::Tan(accMax);
219 cpar[2] = zAbsStart * TMath::Tan(theta1)-dSteel;
220 cpar[3] = zNose * TMath::Tan(accMax);
221 cpar[4] = zNose * TMath::Tan(theta1)-dSteel;
222 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
224 dz = -(zRear-zAbsStart)/2.+cpar[0];
225 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
227 // Tungsten inner shield
229 Float_t zW=zTwoDeg+.1;
230 Float_t dZ = zW+(zRear-dRear-zW)/2.;
237 pcpar[5] = zW * TMath::Tan(accMin);
240 pcpar[8] = zOpen * TMath::Tan(accMin);
241 pcpar[9] = zRear-dRear-dZ;
242 pcpar[10] = rAbs+(zRear-dRear-zOpen) * TMath::Tan(thetaOpen1);
243 pcpar[11] = (zRear-dRear) * TMath::Tan(accMin);
245 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
247 dz=(zW+zRear-dRear)/2-(zAbsStart+zRear)/2.;
248 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
250 // Inner tracking region
257 pcpar[3] = -(zRear-zAbsStart)/2.;
259 pcpar[5] = zAbsStart * TMath::Tan(accMax);
260 pcpar[6] = pcpar[3]+(zTwoDeg-zAbsStart);
262 pcpar[8] = zTwoDeg * TMath::Tan(accMax);
263 pcpar[9] = -pcpar[3];
264 pcpar[10] = zRear * TMath::Tan(accMin);
265 pcpar[11] = zRear * TMath::Tan(accMax);
266 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
268 // special Pb medium for last 5 cm of Pb
269 Float_t zr=zRear-2.-0.001;
271 cpar[1] = zr * TMath::Tan(thetaR);
272 cpar[2] = zr * TMath::Tan(accMax);
273 cpar[3] = cpar[1] + TMath::Tan(thetaR) * 2;
274 cpar[4] = cpar[2] + TMath::Tan(accMax) * 2;
275 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
276 dz=(zRear-zAbsStart)/2.-cpar[0]-0.001;
277 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
279 // concrete cone: concrete
281 pcpar[9] = pcpar[3]+(zRear-dRear-zAbsStart);
282 pcpar[10] = (zRear-dRear) * TMath::Tan(accMin);
283 pcpar[11] = (zRear-dRear) * TMath::Tan(accMax);
284 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
285 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
289 zr = zRear-dRear-dzFe;
291 cpar[1] = zr * TMath::Tan(accMin);
292 cpar[2] = zr * TMath::Tan(accMax);
293 cpar[3] = cpar[1] + TMath::Tan(thetaR) * dzFe;
294 cpar[4] = cpar[2] + TMath::Tan(accMax) * dzFe;
295 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
297 dz = (zRear-zAbsStart)/2.-dRear-dzFe/2.;
299 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
304 // carbon cone: carbon
306 pcpar[9] = pcpar[3]+(zAbsCc-zAbsStart);
307 pcpar[10] = zAbsCc * TMath::Tan(accMin);
308 pcpar[11] = zAbsCc * TMath::Tan(accMax);
309 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
310 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
312 // carbon cone outer region
316 cpar[2] = zAbsStart* TMath::Tan(accMax);
318 cpar[4] = cpar[2]+2. * cpar[0] * TMath::Tan(accMax);
320 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
321 dz=-(zRear-zAbsStart)/2.+cpar[0];
322 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
328 zr=zRear-(dRear-epsi);
329 cpar[0] = (dRear-epsi)/2.;
330 cpar[1] = zr * TMath::Tan(accMin);
331 cpar[2] = zr * TMath::Tan(thetaR*repsi);
332 cpar[3] = cpar[1] + TMath::Tan(accMin) * (dRear-epsi);
333 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * (dRear-epsi);
334 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
335 dz=(zRear-zAbsStart)/2.-cpar[0];
336 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
338 // special W medium for last 5 cm of W
341 cpar[1] = zr * TMath::Tan(accMin);
342 cpar[2] = zr * TMath::Tan(thetaR*repsi);
343 cpar[3] = cpar[1] + TMath::Tan(accMin) * 5.;
344 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * 5.;
345 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
346 dz=(dRear-epsi)/2.-cpar[0];
347 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
350 Float_t drMin=TMath::Tan(thetaR) * 5;
351 Float_t drMax=TMath::Tan(accMax) * 5;
352 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
354 { // Begin local scope for i
355 for (Int_t i=0; i<3; i++) {
356 zr=zRear-dRear+5+i*10.;
357 cpar[1] = zr * TMath::Tan(thetaR);
358 cpar[2] = zr * TMath::Tan(accMax);
359 cpar[3] = cpar[1] + drMin;
360 cpar[4] = cpar[2] + drMax;
361 dz=(zRear-zAbsStart)/2.-cpar[0]-5.-(2-i)*10;
362 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
364 } // End local scope for i
365 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
366 dz = (zRear-zAbsStart)/2.+zAbsStart;
367 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
372 // pipe and heating jackets
376 tpar0[2]=(zOpen-zAbsStart)/2;
379 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
385 tpar[1]=tpar[0]+dInsu;
386 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
387 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
390 tpar[0]=tpar[1]+dEnve;
391 tpar[1]=tpar[0]+dFree;
392 gMC->Gsvolu("AP11", "TUBE", idtmed[kAir+40], tpar, 3);
393 gMC->Gspos("AP11", 1, "AV11", 0., 0., 0., 0, "ONLY");
395 dz=-(zRear-zAbsStart)/2.+tpar0[2];
396 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
400 cpar0[0]=(zRear-dRear-zOpen)/2;
403 Float_t dR=2.*cpar0[0]*TMath::Tan(thetaOpen1);
404 cpar0[3]=cpar0[1]+dR;
405 cpar0[4]=cpar0[2]+dR;
406 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
412 cpar[1]=cpar0[1]+dTube;
413 cpar[2]=cpar0[1]+dTube+dInsu;
414 cpar[3]=cpar0[3]+dTube;
415 cpar[4]=cpar0[3]+dTube+dInsu;
416 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
417 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
420 cpar[1]=cpar0[1]+dTube+dInsu+dEnve;
422 cpar[3]=cpar0[1]+dTube+dInsu+dEnve+dR;
425 gMC->Gsvolu("AP21", "CONE", idtmed[kAir+40], cpar, 5);
426 gMC->Gspos("AP21", 1, "AV21", 0., 0., 0., 0, "ONLY");
428 dz=(zRear-zAbsStart)/2.-cpar0[0]-dRear;
429 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
454 gMC->Gsvolu("ASSS", "PCON", idtmed[kSteel], par, 25);
455 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
460 //_____________________________________________________________________________
462 void AliABSOv0::Init()
465 // Initialisation of the muon absorber after it has been built
469 printf("\n%s: ",ClassName());
470 for(i=0;i<35;i++) printf("*");
471 printf(" ABSOv0_INIT ");
472 for(i=0;i<35;i++) printf("*");
473 printf("\n%s: ",ClassName());
475 for(i=0;i<80;i++) printf("*");