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 1.15 2002/10/29 09:53:40 morsch
19 Constants start with k. Warnings corrected.
21 Revision 1.14 2002/10/21 09:09:33 alibrary
22 Removing unused variables
24 Revision 1.13 2002/10/14 14:57:34 hristov
25 Merging the VirtualMC branch to the main development branch (HEAD)
27 Revision 1.11.6.1 2002/07/24 10:08:27 alibrary
30 Revision 1.12 2002/07/15 07:56:41 morsch
31 Steel rear and Al ring.
33 Revision 1.11 2001/11/29 14:16:51 morsch
34 - truncated inner W-cone
35 - new support structure
37 Revision 1.10 2001/10/25 08:50:57 morsch
38 New beamshield geometry with increased tolerances and insulation thickness.
40 Revision 1.9 2001/05/16 14:57:22 alibrary
41 New files for folders and Stack
43 Revision 1.8 2001/01/12 13:16:09 morsch
44 Store absorber composition information in fMLayers and fZLayers
45 Rear 25 cm Fe + 35 cm Cu
47 Revision 1.7 2000/10/02 21:28:15 fca
48 Removal of useless dependecies via forward declarations
50 Revision 1.6 2000/06/15 09:40:31 morsch
51 Obsolete typedef keyword removed
53 Revision 1.5 2000/06/12 19:39:01 morsch
54 New structure of beam pipe and heating jacket.
56 Revision 1.4 2000/04/03 08:13:40 fca
57 Introduce extra scope for non ANSI compliant C++ compilers
59 Revision 1.3 2000/01/18 17:49:56 morsch
60 Serious overlap of ABSM with shield corrected
61 Small error in ARPB parameters corrected
63 Revision 1.2 2000/01/13 11:23:59 morsch
64 Last layer of Pb outer angle corrected
66 Revision 1.1 2000/01/12 15:39:30 morsch
67 Standard version of ABSO
71 ///////////////////////////////////////////////////////////////////////////////
74 // This class contains the description of the muon absorber geometry //
78 <img src="picts/AliABSOClass.gif">
81 <font size=+2 color=red>
82 <p>The responsible person for this module is
83 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
90 ///////////////////////////////////////////////////////////////////////////////
92 #include "AliABSOv0.h"
98 //_____________________________________________________________________________
99 AliABSOv0::AliABSOv0()
102 // Default constructor
106 //_____________________________________________________________________________
107 AliABSOv0::AliABSOv0(const char *name, const char *title)
108 : AliABSO(name,title)
111 // Standard constructor
118 //_____________________________________________________________________________
119 void AliABSOv0::CreateGeometry()
122 // Creation of the geometry of the muon absorber
126 <img src="picts/AliABSOv0Tree.gif">
131 <img src="picts/AliABSOv0.gif">
138 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
139 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
140 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
142 Int_t *idtmed = fIdtmed->GetArray()-1599;
144 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
147 #include "ABSOSHILConst.h"
148 #include "ABSOConst.h"
150 // Structure of Tracking Region
156 fMLayers[0][0] = kAir; fZLayers[0][0] = kZAbsStart;
157 fMLayers[0][1] = kC; fZLayers[0][1] = kZAbsCc;
158 fMLayers[0][2] = kConcrete; fZLayers[0][2] = kZRear-kDRear-dzFe;
159 fMLayers[0][3] = kSteel; fZLayers[0][3] = kZRear-kDRear;
160 fMLayers[0][4] = kSteel; fZLayers[0][4] = kZRear;
164 fMLayers[1][0] = kAir ; fZLayers[1][0] = fZLayers[0][0]-10.;
165 fMLayers[1][1] = kAl ; fZLayers[1][1] = fZLayers[0][0];
166 fMLayers[1][2] = fMLayers[0][1]; fZLayers[1][2] = fZLayers[0][1];
167 fMLayers[1][3] = fMLayers[0][2]; fZLayers[1][3] = fZLayers[0][2];
168 fMLayers[1][4] = fMLayers[0][3]; fZLayers[1][4] = fZLayers[0][3];
169 fMLayers[1][5] = kNiCuW; fZLayers[1][5] = fZLayers[0][4];
172 Float_t dTube=0.1; // tube thickness
173 Float_t dInsu=0.5; // insulation thickness
174 Float_t dEnve=0.1; // protective envelope thickness
175 // Float_t dFree=0.5; // clearance thickness
178 // Mother volume and outer shielding: Pb
183 par[3] = -(kZRear-kZAbsStart)/2.;
185 par[5] = kZAbsStart * TMath::Tan(kTheta1);
187 par[6] = par[3]+(kZNose-kZAbsStart);
189 par[8] = kZNose * TMath::Tan(kTheta1);
191 par[9] = par[3]+(kZConeTPC-kZAbsStart);
193 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(kTheta2);
195 par[12] = par[3]+(kZOpen-kZAbsStart);
197 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(kAccMax);
199 par[15] = par[3]+(kZRear-kDRear-kZAbsStart);
200 par[16] = kRAbs + (par[15] - par[12]) * TMath::Tan(kThetaOpen1) ;
201 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(kAccMax);
203 par[18] = par[3]+(kZRear-kDRear-kZAbsStart);
204 par[19] = (kZRear-kDRear) * TMath::Tan(kAccMin);
205 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(kAccMax);
208 par[22] = kZRear* TMath::Tan(kAccMin);
209 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(kAccMax);
210 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
211 { // Begin local scope for i
212 for (Int_t i=4; i<18; i+=3) par[i] = 0;
213 } // End local scope for i
214 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
215 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
220 par[4] = par[5] -kDSteel;
221 par[7] = par[8] -kDSteel;
222 par[10]= par[11]-kDSteel;
223 par[13]= par[14]-kDSteel;
224 par[16]= par[17]-kDSteel;
225 par[19]= par[20]-kDSteel;
226 par[22]= par[23]-kDSteel;
227 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
228 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
230 // Polyethylene shield
232 cpar[0] = (kZRear - kZConeTPC) / 2.;
233 cpar[1] = kZConeTPC * TMath::Tan(kAccMax);
234 cpar[2] = cpar[1] + kDPoly;
235 cpar[3] = kZRear * TMath::Tan(kAccMax);
236 cpar[4] = cpar[3] + kDPoly;
237 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
238 dz = (kZRear-kZAbsStart)/2.-cpar[0];
239 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
242 // Tungsten nose to protect TPC
244 cpar[0] = (kZNose - kZAbsStart) / 2.;
245 cpar[1] = kZAbsStart * TMath::Tan(kAccMax);
246 cpar[2] = kZAbsStart * TMath::Tan(kTheta1)-kDSteel;
247 cpar[3] = kZNose * TMath::Tan(kAccMax);
248 cpar[4] = kZNose * TMath::Tan(kTheta1)-kDSteel;
249 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
251 dz = -(kZRear-kZAbsStart)/2.+cpar[0];
252 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
254 // Tungsten inner shield
256 Float_t zW = kZTwoDeg+.1;
257 Float_t dZ = zW+(kZRear-kDRear-zW)/2.;
264 pcpar[5] = zW * TMath::Tan(kAccMin);
265 pcpar[6] = kZOpen-dZ;
267 pcpar[8] = kZOpen * TMath::Tan(kAccMin);
268 pcpar[9] = kZRear-kDRear-dZ;
269 pcpar[10] = kRAbs+(kZRear-kDRear-kZOpen) * TMath::Tan(kThetaOpen1);
270 pcpar[11] = (kZRear-kDRear) * TMath::Tan(kAccMin);
272 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
273 dz=(zW+kZRear-kDRear)/2-(kZAbsStart+kZRear)/2.;
274 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
276 // First part replaced by Carbon
278 cpar[0] = (200.-zW)/2.;
282 cpar[4] = 200. * TMath::Tan(kAccMin);
283 gMC->Gsvolu("ACNO", "CONE", idtmed[kC], cpar, 5);
285 gMC->Gspos("ACNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
289 cpar[0] = (kZRear-kDRear-zWW)/2.;
290 cpar[1] = kRAbs + (zWW-kZOpen) * TMath::Tan(kThetaOpen1);
291 cpar[2] = zWW * TMath::Tan(kAccMin);
294 gMC->Gsvolu("AWNO", "CONE", idtmed[kCu+40], cpar, 5);
297 gMC->Gspos("AWNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
300 // Inner tracking region
308 pcpar[3] = -(kZRear-kZAbsStart)/2.;
310 pcpar[5] = kZAbsStart * TMath::Tan(kAccMax);
311 pcpar[6] = pcpar[3]+(kZTwoDeg-kZAbsStart);
313 pcpar[8] = kZTwoDeg * TMath::Tan(kAccMax);
314 pcpar[9] = -pcpar[3];
315 pcpar[10] = kZRear * TMath::Tan(kAccMin);
316 pcpar[11] = kZRear * TMath::Tan(kAccMax);
317 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
319 // special Pb medium for last 5 cm of Pb
320 Float_t zr=kZRear-2.-0.001;
322 cpar[1] = zr * TMath::Tan(kThetaR);
323 cpar[2] = zr * TMath::Tan(kAccMax);
324 cpar[3] = cpar[1] + TMath::Tan(kThetaR) * 2;
325 cpar[4] = cpar[2] + TMath::Tan(kAccMax) * 2;
326 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
327 dz=(kZRear-kZAbsStart)/2.-cpar[0]-0.001;
328 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
330 // concrete cone: concrete
332 pcpar[9] = pcpar[3]+(kZRear-kDRear-kZAbsStart);
333 pcpar[10] = (kZRear-kDRear) * TMath::Tan(kAccMin);
334 pcpar[11] = (kZRear-kDRear) * TMath::Tan(kAccMax);
335 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
336 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
340 zr = kZRear-kDRear-dzFe;
342 cpar[1] = zr * TMath::Tan(kAccMin);
343 cpar[2] = zr * TMath::Tan(kAccMax);
344 cpar[3] = cpar[1] + TMath::Tan(kAccMin) * dzFe;
345 cpar[4] = cpar[2] + TMath::Tan(kAccMax) * dzFe;
346 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
348 dz = (kZRear-kZAbsStart)/2.-kDRear-dzFe/2.;
350 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
355 // carbon cone: carbon
357 pcpar[9] = pcpar[3]+(kZAbsCc-kZAbsStart);
358 pcpar[10] = kZAbsCc * TMath::Tan(kAccMin);
359 pcpar[11] = kZAbsCc * TMath::Tan(kAccMax);
360 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
361 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
363 // carbon cone outer region
367 cpar[2] = kZAbsStart* TMath::Tan(kAccMax);
369 cpar[4] = cpar[2]+2. * cpar[0] * TMath::Tan(kAccMax);
371 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
372 dz=-(kZRear-kZAbsStart)/2.+cpar[0];
373 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
379 zr=kZRear-(kDRear-epsi);
380 cpar[0] = (kDRear-epsi)/2.;
381 cpar[1] = zr * TMath::Tan(kAccMin);
382 cpar[2] = zr * TMath::Tan(kThetaR*repsi);
383 cpar[3] = cpar[1] + TMath::Tan(kAccMin) * (kDRear-epsi);
384 cpar[4] = cpar[2] + TMath::Tan(kThetaR*repsi) * (kDRear-epsi);
385 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
386 dz=(kZRear-kZAbsStart)/2.-cpar[0];
387 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
389 // special W medium for last 5 cm of W
392 cpar[1] = zr * TMath::Tan(kAccMin);
393 cpar[2] = zr * TMath::Tan(kThetaR*repsi);
394 cpar[3] = cpar[1] + TMath::Tan(kAccMin) * 5.;
395 cpar[4] = cpar[2] + TMath::Tan(kThetaR*repsi) * 5.;
396 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
397 dz=(kDRear-epsi)/2.-cpar[0];
398 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
401 Float_t drMin=TMath::Tan(kThetaR) * 5;
402 Float_t drMax=TMath::Tan(kAccMax) * 5;
403 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
405 { // Begin local scope for i
406 for (Int_t i=0; i<3; i++) {
407 zr=kZRear-kDRear+5+i*10.;
408 cpar[1] = zr * TMath::Tan(kThetaR);
409 cpar[2] = zr * TMath::Tan(kAccMax);
410 cpar[3] = cpar[1] + drMin;
411 cpar[4] = cpar[2] + drMax;
412 dz=(kZRear-kZAbsStart)/2.-cpar[0]-5.-(2-i)*10;
413 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
415 } // End local scope for i
416 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
417 dz = (kZRear-kZAbsStart)/2.+kZAbsStart;
418 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
423 // pipe and heating jackets
427 tpar0[2]=(kZOpen-kZAbsStart)/2;
429 tpar0[1]=kRVacu+dTube+dInsu+dEnve;
430 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
435 tpar[0]=kRVacu+dTube;
436 tpar[1]=tpar[0]+dInsu;
437 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
438 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
440 dz=-(kZRear-kZAbsStart)/2.+tpar0[2];
441 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
445 cpar0[0]=(kZRear-kDRear-kZOpen)/2;
446 cpar0[1]= kRVacu-0.05;
447 cpar0[2]= kRVacu+dTube+dInsu+dEnve;
448 Float_t dR=2.*cpar0[0]*TMath::Tan(kThetaOpen1);
449 cpar0[3]=cpar0[1]+dR;
450 cpar0[4]=cpar0[2]+dR;
451 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
457 cpar[1]=cpar0[1]+dTube;
458 cpar[2]=cpar0[1]+dTube+dInsu;
459 cpar[3]=cpar0[3]+dTube;
460 cpar[4]=cpar0[3]+dTube+dInsu;
461 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
462 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
464 dz=(kZRear-kZAbsStart)/2.-cpar0[0]-kDRear;
465 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
482 par[10] = kZRear+20.;
491 gMC->Gsvolu("ASSS", "PGON", idtmed[kAl], par, 16);
492 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
495 trap[ 0] = (530.-170.)/2.;
498 trap[ 4] = (600.-(kZRear+2.))/2.;;
505 trap[ 1] = -TMath::ATan((trap[4]-trap[8])/2./trap[0])*180./TMath::Pi();
506 AliMatrix(idrotm[1600], 180., 0., 90., 0., 90., 90.);
507 AliMatrix(idrotm[1601], 180., 0., 90., 0., 90., 270.);
508 gMC->Gsvolu("ASST", "TRAP", idtmed[kSteel], trap, 11);
509 dz = (600.+kZRear+2.)/2.+(trap[4]-trap[8])/2.;
510 // Float_t dy = 170.+trap[0];
512 // gMC->Gspos("ASST", 1, "ALIC", 0., dy, dz, idrotm[1600], "ONLY");
513 // gMC->Gspos("ASST", 2, "ALIC", 0., -dy, dz, idrotm[1601], "ONLY");
516 //_____________________________________________________________________________
518 void AliABSOv0::Init()
521 // Initialisation of the muon absorber after it has been built
525 printf("\n%s: ",ClassName());
526 for(i=0;i<35;i++) printf("*");
527 printf(" ABSOv0_INIT ");
528 for(i=0;i<35;i++) printf("*");
529 printf("\n%s: ",ClassName());
531 for(i=0;i<80;i++) printf("*");