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 1.7 2000/10/02 21:28:15 fca
19 Removal of useless dependecies via forward declarations
21 Revision 1.6 2000/06/15 09:40:31 morsch
22 Obsolete typedef keyword removed
24 Revision 1.5 2000/06/12 19:39:01 morsch
25 New structure of beam pipe and heating jacket.
27 Revision 1.4 2000/04/03 08:13:40 fca
28 Introduce extra scope for non ANSI compliant C++ compilers
30 Revision 1.3 2000/01/18 17:49:56 morsch
31 Serious overlap of ABSM with shield corrected
32 Small error in ARPB parameters corrected
34 Revision 1.2 2000/01/13 11:23:59 morsch
35 Last layer of Pb outer angle corrected
37 Revision 1.1 2000/01/12 15:39:30 morsch
38 Standard version of ABSO
42 ///////////////////////////////////////////////////////////////////////////////
45 // This class contains the description of the muon absorber geometry //
49 <img src="picts/AliABSOClass.gif">
52 <font size=+2 color=red>
53 <p>The responsible person for this module is
54 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
61 ///////////////////////////////////////////////////////////////////////////////
63 #include "AliABSOv0.h"
70 //_____________________________________________________________________________
71 AliABSOv0::AliABSOv0()
74 // Default constructor
78 //_____________________________________________________________________________
79 AliABSOv0::AliABSOv0(const char *name, const char *title)
83 // Standard constructor
90 //_____________________________________________________________________________
91 void AliABSOv0::CreateGeometry()
94 // Creation of the geometry of the muon absorber
98 <img src="picts/AliABSOv0Tree.gif">
103 <img src="picts/AliABSOv0.gif">
110 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
111 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
112 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
114 Int_t *idtmed = fIdtmed->GetArray()-1599;
116 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
118 #include "ABSOSHILConst.h"
119 #include "ABSOConst.h"
121 // Structure of Tracking Region
127 fMLayers[0][0] = kAir; fZLayers[0][0] = zAbsStart;
128 fMLayers[0][1] = kC; fZLayers[0][1] = zAbsCc;
129 fMLayers[0][2] = kConcrete; fZLayers[0][2] = zRear-dRear-dzFe;
130 fMLayers[0][3] = kFe; fZLayers[0][3] = zRear-dRear;
131 fMLayers[0][4] = kCu; fZLayers[0][4] = zRear;
134 fMLayers[1][0] = fMLayers[0][0]; fZLayers[1][0] = fZLayers[0][0];
135 fMLayers[1][1] = fMLayers[0][1]; fZLayers[1][1] = fZLayers[0][1];
136 fMLayers[1][2] = fMLayers[0][2]; fZLayers[1][2] = fZLayers[0][2];
137 fMLayers[1][3] = fMLayers[0][3]; fZLayers[1][3] = fZLayers[0][3];
138 fMLayers[1][4] = kNiCuW; fZLayers[1][4] = fZLayers[0][4];
141 Float_t dTube=0.1; // tube thickness
142 Float_t dInsu=0.5; // insulation thickness
143 Float_t dEnve=0.1; // protective envelope thickness
144 Float_t dFree=0.5; // clearance thickness
147 // Mother volume and outer shielding: Pb
152 par[3] = -(zRear-zAbsStart)/2.;
154 par[5] = zAbsStart * TMath::Tan(theta1);
156 par[6] = par[3]+(zNose-zAbsStart);
158 par[8] = zNose * TMath::Tan(theta1);
160 par[9] = par[3]+(zConeTPC-zAbsStart);
162 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(theta2);
164 par[12] = par[3]+(zOpen-zAbsStart);
166 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(accMax);
168 par[15] = par[3]+(zRear-dRear-zAbsStart);
169 par[16] = rAbs + (par[15] - par[12]) * TMath::Tan(thetaOpen1) ;
170 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(accMax);
172 par[18] = par[3]+(zRear-dRear-zAbsStart);
173 par[19] = (zRear-dRear) * TMath::Tan(accMin);
174 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(accMax);
177 par[22] = zRear* TMath::Tan(accMin);
178 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(accMax);
179 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
180 { // Begin local scope for i
181 for (Int_t i=4; i<18; i+=3) par[i] = 0;
182 } // End local scope for i
183 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
184 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
189 par[4] = par[5] -dSteel;
190 par[7] = par[8] -dSteel;
191 par[10]= par[11]-dSteel;
192 par[13]= par[14]-dSteel;
193 par[16]= par[17]-dSteel;
194 par[19]= par[20]-dSteel;
195 par[22]= par[23]-dSteel;
196 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
197 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
199 // Polyethylene shield
201 cpar[0] = (zRear - zConeTPC) / 2.;
202 cpar[1] = zConeTPC * TMath::Tan(accMax);
203 cpar[2] = cpar[1] + dPoly;
204 cpar[3] = zRear * TMath::Tan(accMax);
205 cpar[4] = cpar[3] + dPoly;
206 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
207 dz = (zRear-zAbsStart)/2.-cpar[0];
208 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
211 // Tungsten nose to protect TPC
213 cpar[0] = (zNose - zAbsStart) / 2.;
214 cpar[1] = zAbsStart * TMath::Tan(accMax);
215 cpar[2] = zAbsStart * TMath::Tan(theta1)-dSteel;
216 cpar[3] = zNose * TMath::Tan(accMax);
217 cpar[4] = zNose * TMath::Tan(theta1)-dSteel;
218 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
220 dz = -(zRear-zAbsStart)/2.+cpar[0];
221 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
223 // Tungsten inner shield
225 Float_t zW=zTwoDeg+.1;
226 Float_t dZ = zW+(zRear-dRear-zW)/2.;
233 pcpar[5] = zW * TMath::Tan(accMin);
236 pcpar[8] = zOpen * TMath::Tan(accMin);
237 pcpar[9] = zRear-dRear-dZ;
238 pcpar[10] = rAbs+(zRear-dRear-zOpen) * TMath::Tan(thetaOpen1);
239 pcpar[11] = (zRear-dRear) * TMath::Tan(accMin);
241 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
243 dz=(zW+zRear-dRear)/2-(zAbsStart+zRear)/2.;
244 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
246 // Inner tracking region
253 pcpar[3] = -(zRear-zAbsStart)/2.;
255 pcpar[5] = zAbsStart * TMath::Tan(accMax);
256 pcpar[6] = pcpar[3]+(zTwoDeg-zAbsStart);
258 pcpar[8] = zTwoDeg * TMath::Tan(accMax);
259 pcpar[9] = -pcpar[3];
260 pcpar[10] = zRear * TMath::Tan(accMin);
261 pcpar[11] = zRear * TMath::Tan(accMax);
262 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
264 // special Pb medium for last 5 cm of Pb
265 Float_t zr=zRear-2.-0.001;
267 cpar[1] = zr * TMath::Tan(thetaR);
268 cpar[2] = zr * TMath::Tan(accMax);
269 cpar[3] = cpar[1] + TMath::Tan(thetaR) * 2;
270 cpar[4] = cpar[2] + TMath::Tan(accMax) * 2;
271 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
272 dz=(zRear-zAbsStart)/2.-cpar[0]-0.001;
273 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
275 // concrete cone: concrete
277 pcpar[9] = pcpar[3]+(zRear-dRear-zAbsStart);
278 pcpar[10] = (zRear-dRear) * TMath::Tan(accMin);
279 pcpar[11] = (zRear-dRear) * TMath::Tan(accMax);
280 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
281 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
285 zr = zRear-dRear-dzFe;
287 cpar[1] = zr * TMath::Tan(accMin);
288 cpar[2] = zr * TMath::Tan(accMax);
289 cpar[3] = cpar[1] + TMath::Tan(thetaR) * dzFe;
290 cpar[4] = cpar[2] + TMath::Tan(accMax) * dzFe;
291 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
293 dz = (zRear-zAbsStart)/2.-dRear-dzFe/2.;
295 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
300 // carbon cone: carbon
302 pcpar[9] = pcpar[3]+(zAbsCc-zAbsStart);
303 pcpar[10] = zAbsCc * TMath::Tan(accMin);
304 pcpar[11] = zAbsCc * TMath::Tan(accMax);
305 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
306 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
308 // carbon cone outer region
312 cpar[2] = zAbsStart* TMath::Tan(accMax);
314 cpar[4] = cpar[2]+2. * cpar[0] * TMath::Tan(accMax);
316 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
317 dz=-(zRear-zAbsStart)/2.+cpar[0];
318 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
324 zr=zRear-(dRear-epsi);
325 cpar[0] = (dRear-epsi)/2.;
326 cpar[1] = zr * TMath::Tan(accMin);
327 cpar[2] = zr * TMath::Tan(thetaR*repsi);
328 cpar[3] = cpar[1] + TMath::Tan(accMin) * (dRear-epsi);
329 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * (dRear-epsi);
330 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
331 dz=(zRear-zAbsStart)/2.-cpar[0];
332 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
334 // special W medium for last 5 cm of W
337 cpar[1] = zr * TMath::Tan(accMin);
338 cpar[2] = zr * TMath::Tan(thetaR*repsi);
339 cpar[3] = cpar[1] + TMath::Tan(accMin) * 5.;
340 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * 5.;
341 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
342 dz=(dRear-epsi)/2.-cpar[0];
343 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
346 Float_t drMin=TMath::Tan(thetaR) * 5;
347 Float_t drMax=TMath::Tan(accMax) * 5;
348 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
350 { // Begin local scope for i
351 for (Int_t i=0; i<3; i++) {
352 zr=zRear-dRear+5+i*10.;
353 cpar[1] = zr * TMath::Tan(thetaR);
354 cpar[2] = zr * TMath::Tan(accMax);
355 cpar[3] = cpar[1] + drMin;
356 cpar[4] = cpar[2] + drMax;
357 dz=(zRear-zAbsStart)/2.-cpar[0]-5.-(2-i)*10;
358 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
360 } // End local scope for i
361 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
362 dz = (zRear-zAbsStart)/2.+zAbsStart;
363 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
368 // pipe and heating jackets
372 tpar0[2]=(zOpen-zAbsStart)/2;
375 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
381 tpar[1]=tpar[0]+dInsu;
382 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
383 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
386 tpar[0]=tpar[1]+dEnve;
387 tpar[1]=tpar[0]+dFree;
388 gMC->Gsvolu("AP11", "TUBE", idtmed[kAir+40], tpar, 3);
389 gMC->Gspos("AP11", 1, "AV11", 0., 0., 0., 0, "ONLY");
391 dz=-(zRear-zAbsStart)/2.+tpar0[2];
392 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
396 cpar0[0]=(zRear-dRear-zOpen)/2;
399 Float_t dR=2.*cpar0[0]*TMath::Tan(thetaOpen1);
400 cpar0[3]=cpar0[1]+dR;
401 cpar0[4]=cpar0[2]+dR;
402 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
408 cpar[1]=cpar0[1]+dTube;
409 cpar[2]=cpar0[1]+dTube+dInsu;
410 cpar[3]=cpar0[3]+dTube;
411 cpar[4]=cpar0[3]+dTube+dInsu;
412 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
413 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
416 cpar[1]=cpar0[1]+dTube+dInsu+dEnve;
418 cpar[3]=cpar0[1]+dTube+dInsu+dEnve+dR;
421 gMC->Gsvolu("AP21", "CONE", idtmed[kAir+40], cpar, 5);
422 gMC->Gspos("AP21", 1, "AV21", 0., 0., 0., 0, "ONLY");
424 dz=(zRear-zAbsStart)/2.-cpar0[0]-dRear;
425 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
450 gMC->Gsvolu("ASSS", "PCON", idtmed[kSteel], par, 25);
451 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
456 //_____________________________________________________________________________
458 void AliABSOv0::Init()
461 // Initialisation of the muon absorber after it has been built
465 for(i=0;i<35;i++) printf("*");
466 printf(" ABSOv0_INIT ");
467 for(i=0;i<35;i++) printf("*");
470 for(i=0;i<80;i++) printf("*");