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 1.10 2001/10/25 08:50:57 morsch
19 New beamshield geometry with increased tolerances and insulation thickness.
21 Revision 1.9 2001/05/16 14:57:22 alibrary
22 New files for folders and Stack
24 Revision 1.8 2001/01/12 13:16:09 morsch
25 Store absorber composition information in fMLayers and fZLayers
26 Rear 25 cm Fe + 35 cm Cu
28 Revision 1.7 2000/10/02 21:28:15 fca
29 Removal of useless dependecies via forward declarations
31 Revision 1.6 2000/06/15 09:40:31 morsch
32 Obsolete typedef keyword removed
34 Revision 1.5 2000/06/12 19:39:01 morsch
35 New structure of beam pipe and heating jacket.
37 Revision 1.4 2000/04/03 08:13:40 fca
38 Introduce extra scope for non ANSI compliant C++ compilers
40 Revision 1.3 2000/01/18 17:49:56 morsch
41 Serious overlap of ABSM with shield corrected
42 Small error in ARPB parameters corrected
44 Revision 1.2 2000/01/13 11:23:59 morsch
45 Last layer of Pb outer angle corrected
47 Revision 1.1 2000/01/12 15:39:30 morsch
48 Standard version of ABSO
52 ///////////////////////////////////////////////////////////////////////////////
55 // This class contains the description of the muon absorber geometry //
59 <img src="picts/AliABSOClass.gif">
62 <font size=+2 color=red>
63 <p>The responsible person for this module is
64 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
71 ///////////////////////////////////////////////////////////////////////////////
73 #include "AliABSOv0.h"
80 //_____________________________________________________________________________
81 AliABSOv0::AliABSOv0()
84 // Default constructor
88 //_____________________________________________________________________________
89 AliABSOv0::AliABSOv0(const char *name, const char *title)
93 // Standard constructor
100 //_____________________________________________________________________________
101 void AliABSOv0::CreateGeometry()
104 // Creation of the geometry of the muon absorber
108 <img src="picts/AliABSOv0Tree.gif">
113 <img src="picts/AliABSOv0.gif">
120 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
121 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
122 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
124 Int_t *idtmed = fIdtmed->GetArray()-1599;
126 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
129 #include "ABSOSHILConst.h"
130 #include "ABSOConst.h"
132 // Structure of Tracking Region
138 fMLayers[0][0] = kAir; fZLayers[0][0] = zAbsStart;
139 fMLayers[0][1] = kC; fZLayers[0][1] = zAbsCc;
140 fMLayers[0][2] = kConcrete; fZLayers[0][2] = zRear-dRear-dzFe;
141 fMLayers[0][3] = kSteel; fZLayers[0][3] = zRear-dRear;
142 fMLayers[0][4] = kCu; fZLayers[0][4] = zRear;
145 fMLayers[1][0] = fMLayers[0][0]; fZLayers[1][0] = fZLayers[0][0];
146 fMLayers[1][1] = fMLayers[0][1]; fZLayers[1][1] = fZLayers[0][1];
147 fMLayers[1][2] = fMLayers[0][2]; fZLayers[1][2] = fZLayers[0][2];
148 fMLayers[1][3] = fMLayers[0][3]; fZLayers[1][3] = fZLayers[0][3];
149 fMLayers[1][4] = kNiCuW; fZLayers[1][4] = fZLayers[0][4];
152 Float_t dTube=0.1; // tube thickness
153 Float_t dInsu=0.5; // insulation thickness
154 Float_t dEnve=0.1; // protective envelope thickness
155 Float_t dFree=0.5; // clearance thickness
158 // Mother volume and outer shielding: Pb
163 par[3] = -(zRear-zAbsStart)/2.;
165 par[5] = zAbsStart * TMath::Tan(theta1);
167 par[6] = par[3]+(zNose-zAbsStart);
169 par[8] = zNose * TMath::Tan(theta1);
171 par[9] = par[3]+(zConeTPC-zAbsStart);
173 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(theta2);
175 par[12] = par[3]+(zOpen-zAbsStart);
177 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(accMax);
179 par[15] = par[3]+(zRear-dRear-zAbsStart);
180 par[16] = rAbs + (par[15] - par[12]) * TMath::Tan(thetaOpen1) ;
181 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(accMax);
183 par[18] = par[3]+(zRear-dRear-zAbsStart);
184 par[19] = (zRear-dRear) * TMath::Tan(accMin);
185 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(accMax);
188 par[22] = zRear* TMath::Tan(accMin);
189 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(accMax);
190 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
191 { // Begin local scope for i
192 for (Int_t i=4; i<18; i+=3) par[i] = 0;
193 } // End local scope for i
194 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
195 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
200 par[4] = par[5] -dSteel;
201 par[7] = par[8] -dSteel;
202 par[10]= par[11]-dSteel;
203 par[13]= par[14]-dSteel;
204 par[16]= par[17]-dSteel;
205 par[19]= par[20]-dSteel;
206 par[22]= par[23]-dSteel;
207 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
208 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
210 // Polyethylene shield
212 cpar[0] = (zRear - zConeTPC) / 2.;
213 cpar[1] = zConeTPC * TMath::Tan(accMax);
214 cpar[2] = cpar[1] + dPoly;
215 cpar[3] = zRear * TMath::Tan(accMax);
216 cpar[4] = cpar[3] + dPoly;
217 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
218 dz = (zRear-zAbsStart)/2.-cpar[0];
219 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
222 // Tungsten nose to protect TPC
224 cpar[0] = (zNose - zAbsStart) / 2.;
225 cpar[1] = zAbsStart * TMath::Tan(accMax);
226 cpar[2] = zAbsStart * TMath::Tan(theta1)-dSteel;
227 cpar[3] = zNose * TMath::Tan(accMax);
228 cpar[4] = zNose * TMath::Tan(theta1)-dSteel;
229 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
231 dz = -(zRear-zAbsStart)/2.+cpar[0];
232 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
234 // Tungsten inner shield
236 Float_t zW = zTwoDeg+.1;
237 Float_t dZ = zW+(zRear-dRear-zW)/2.;
244 pcpar[5] = zW * TMath::Tan(accMin);
247 pcpar[8] = zOpen * TMath::Tan(accMin);
248 pcpar[9] = zRear-dRear-dZ;
249 pcpar[10] = rAbs+(zRear-dRear-zOpen) * TMath::Tan(thetaOpen1);
250 pcpar[11] = (zRear-dRear) * TMath::Tan(accMin);
252 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
254 dz=(zW+zRear-dRear)/2-(zAbsStart+zRear)/2.;
255 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
256 cpar[0] = (200.-zW)/2.;
260 cpar[4] = 200. * TMath::Tan(accMin);
261 gMC->Gsvolu("ACNO", "CONE", idtmed[kC], cpar, 5);
264 gMC->Gspos("ACNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
265 // Inner tracking region
272 pcpar[3] = -(zRear-zAbsStart)/2.;
274 pcpar[5] = zAbsStart * TMath::Tan(accMax);
275 pcpar[6] = pcpar[3]+(zTwoDeg-zAbsStart);
277 pcpar[8] = zTwoDeg * TMath::Tan(accMax);
278 pcpar[9] = -pcpar[3];
279 pcpar[10] = zRear * TMath::Tan(accMin);
280 pcpar[11] = zRear * TMath::Tan(accMax);
281 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
283 // special Pb medium for last 5 cm of Pb
284 Float_t zr=zRear-2.-0.001;
286 cpar[1] = zr * TMath::Tan(thetaR);
287 cpar[2] = zr * TMath::Tan(accMax);
288 cpar[3] = cpar[1] + TMath::Tan(thetaR) * 2;
289 cpar[4] = cpar[2] + TMath::Tan(accMax) * 2;
290 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
291 dz=(zRear-zAbsStart)/2.-cpar[0]-0.001;
292 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
294 // concrete cone: concrete
296 pcpar[9] = pcpar[3]+(zRear-dRear-zAbsStart);
297 pcpar[10] = (zRear-dRear) * TMath::Tan(accMin);
298 pcpar[11] = (zRear-dRear) * TMath::Tan(accMax);
299 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
300 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
304 zr = zRear-dRear-dzFe;
306 cpar[1] = zr * TMath::Tan(accMin);
307 cpar[2] = zr * TMath::Tan(accMax);
308 cpar[3] = cpar[1] + TMath::Tan(accMin) * dzFe;
309 cpar[4] = cpar[2] + TMath::Tan(accMax) * dzFe;
310 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
312 dz = (zRear-zAbsStart)/2.-dRear-dzFe/2.;
314 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
319 // carbon cone: carbon
321 pcpar[9] = pcpar[3]+(zAbsCc-zAbsStart);
322 pcpar[10] = zAbsCc * TMath::Tan(accMin);
323 pcpar[11] = zAbsCc * TMath::Tan(accMax);
324 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
325 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
327 // carbon cone outer region
331 cpar[2] = zAbsStart* TMath::Tan(accMax);
333 cpar[4] = cpar[2]+2. * cpar[0] * TMath::Tan(accMax);
335 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
336 dz=-(zRear-zAbsStart)/2.+cpar[0];
337 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
343 zr=zRear-(dRear-epsi);
344 cpar[0] = (dRear-epsi)/2.;
345 cpar[1] = zr * TMath::Tan(accMin);
346 cpar[2] = zr * TMath::Tan(thetaR*repsi);
347 cpar[3] = cpar[1] + TMath::Tan(accMin) * (dRear-epsi);
348 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * (dRear-epsi);
349 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
350 dz=(zRear-zAbsStart)/2.-cpar[0];
351 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
353 // special W medium for last 5 cm of W
356 cpar[1] = zr * TMath::Tan(accMin);
357 cpar[2] = zr * TMath::Tan(thetaR*repsi);
358 cpar[3] = cpar[1] + TMath::Tan(accMin) * 5.;
359 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * 5.;
360 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
361 dz=(dRear-epsi)/2.-cpar[0];
362 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
365 Float_t drMin=TMath::Tan(thetaR) * 5;
366 Float_t drMax=TMath::Tan(accMax) * 5;
367 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
369 { // Begin local scope for i
370 for (Int_t i=0; i<3; i++) {
371 zr=zRear-dRear+5+i*10.;
372 cpar[1] = zr * TMath::Tan(thetaR);
373 cpar[2] = zr * TMath::Tan(accMax);
374 cpar[3] = cpar[1] + drMin;
375 cpar[4] = cpar[2] + drMax;
376 dz=(zRear-zAbsStart)/2.-cpar[0]-5.-(2-i)*10;
377 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
379 } // End local scope for i
380 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
381 dz = (zRear-zAbsStart)/2.+zAbsStart;
382 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
387 // pipe and heating jackets
391 tpar0[2]=(zOpen-zAbsStart)/2;
393 tpar0[1]=rVacu+dTube+dInsu+dEnve;
394 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
400 tpar[1]=tpar[0]+dInsu;
401 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
402 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
404 dz=-(zRear-zAbsStart)/2.+tpar0[2];
405 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
409 cpar0[0]=(zRear-dRear-zOpen)/2;
410 cpar0[1]= rVacu-0.05;
411 cpar0[2]= rVacu+dTube+dInsu+dEnve;
412 Float_t dR=2.*cpar0[0]*TMath::Tan(thetaOpen1);
413 cpar0[3]=cpar0[1]+dR;
414 cpar0[4]=cpar0[2]+dR;
415 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
421 cpar[1]=cpar0[1]+dTube;
422 cpar[2]=cpar0[1]+dTube+dInsu;
423 cpar[3]=cpar0[3]+dTube;
424 cpar[4]=cpar0[3]+dTube+dInsu;
425 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
426 gMC->Gspos("AI21", 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");
455 gMC->Gsvolu("ASSS", "PGON", idtmed[kSteel], par, 16);
456 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
459 trap[ 0] = (530.-170.)/2.;
462 trap[ 4] = (600.-(zRear+2.))/2.;;
469 trap[ 1] = -TMath::ATan((trap[4]-trap[8])/2./trap[0])*180./TMath::Pi();
470 AliMatrix(idrotm[1600], 180., 0., 90., 0., 90., 90.);
471 AliMatrix(idrotm[1601], 180., 0., 90., 0., 90., 270.);
472 gMC->Gsvolu("ASST", "TRAP", idtmed[kSteel], trap, 11);
473 dz = (600.+zRear+2.)/2.+(trap[4]-trap[8])/2.;
474 Float_t dy = 170.+trap[0];
476 gMC->Gspos("ASST", 1, "ALIC", 0., dy, dz, idrotm[1600], "ONLY");
477 gMC->Gspos("ASST", 2, "ALIC", 0., -dy, dz, idrotm[1601], "ONLY");
480 //_____________________________________________________________________________
482 void AliABSOv0::Init()
485 // Initialisation of the muon absorber after it has been built
489 printf("\n%s: ",ClassName());
490 for(i=0;i<35;i++) printf("*");
491 printf(" ABSOv0_INIT ");
492 for(i=0;i<35;i++) printf("*");
493 printf("\n%s: ",ClassName());
495 for(i=0;i<80;i++) printf("*");