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 1.11.6.1 2002/07/24 10:08:27 alibrary
21 Revision 1.12 2002/07/15 07:56:41 morsch
22 Steel rear and Al ring.
24 Revision 1.11 2001/11/29 14:16:51 morsch
25 - truncated inner W-cone
26 - new support structure
28 Revision 1.10 2001/10/25 08:50:57 morsch
29 New beamshield geometry with increased tolerances and insulation thickness.
31 Revision 1.9 2001/05/16 14:57:22 alibrary
32 New files for folders and Stack
34 Revision 1.8 2001/01/12 13:16:09 morsch
35 Store absorber composition information in fMLayers and fZLayers
36 Rear 25 cm Fe + 35 cm Cu
38 Revision 1.7 2000/10/02 21:28:15 fca
39 Removal of useless dependecies via forward declarations
41 Revision 1.6 2000/06/15 09:40:31 morsch
42 Obsolete typedef keyword removed
44 Revision 1.5 2000/06/12 19:39:01 morsch
45 New structure of beam pipe and heating jacket.
47 Revision 1.4 2000/04/03 08:13:40 fca
48 Introduce extra scope for non ANSI compliant C++ compilers
50 Revision 1.3 2000/01/18 17:49:56 morsch
51 Serious overlap of ABSM with shield corrected
52 Small error in ARPB parameters corrected
54 Revision 1.2 2000/01/13 11:23:59 morsch
55 Last layer of Pb outer angle corrected
57 Revision 1.1 2000/01/12 15:39:30 morsch
58 Standard version of ABSO
62 ///////////////////////////////////////////////////////////////////////////////
65 // This class contains the description of the muon absorber geometry //
69 <img src="picts/AliABSOClass.gif">
72 <font size=+2 color=red>
73 <p>The responsible person for this module is
74 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
81 ///////////////////////////////////////////////////////////////////////////////
83 #include "AliABSOv0.h"
90 //_____________________________________________________________________________
91 AliABSOv0::AliABSOv0()
94 // Default constructor
98 //_____________________________________________________________________________
99 AliABSOv0::AliABSOv0(const char *name, const char *title)
100 : AliABSO(name,title)
103 // Standard constructor
110 //_____________________________________________________________________________
111 void AliABSOv0::CreateGeometry()
114 // Creation of the geometry of the muon absorber
118 <img src="picts/AliABSOv0Tree.gif">
123 <img src="picts/AliABSOv0.gif">
130 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
131 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
132 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
134 Int_t *idtmed = fIdtmed->GetArray()-1599;
136 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
139 #include "ABSOSHILConst.h"
140 #include "ABSOConst.h"
142 // Structure of Tracking Region
148 fMLayers[0][0] = kAir; fZLayers[0][0] = zAbsStart;
149 fMLayers[0][1] = kC; fZLayers[0][1] = zAbsCc;
150 fMLayers[0][2] = kConcrete; fZLayers[0][2] = zRear-dRear-dzFe;
151 fMLayers[0][3] = kSteel; fZLayers[0][3] = zRear-dRear;
152 fMLayers[0][4] = kSteel; fZLayers[0][4] = zRear;
155 fMLayers[1][0] = fMLayers[0][0]; fZLayers[1][0] = fZLayers[0][0];
156 fMLayers[1][1] = fMLayers[0][1]; fZLayers[1][1] = fZLayers[0][1];
157 fMLayers[1][2] = fMLayers[0][2]; fZLayers[1][2] = fZLayers[0][2];
158 fMLayers[1][3] = fMLayers[0][3]; fZLayers[1][3] = fZLayers[0][3];
159 fMLayers[1][4] = kNiCuW; fZLayers[1][4] = fZLayers[0][4];
162 Float_t dTube=0.1; // tube thickness
163 Float_t dInsu=0.5; // insulation thickness
164 Float_t dEnve=0.1; // protective envelope thickness
165 Float_t dFree=0.5; // clearance thickness
168 // Mother volume and outer shielding: Pb
173 par[3] = -(zRear-zAbsStart)/2.;
175 par[5] = zAbsStart * TMath::Tan(theta1);
177 par[6] = par[3]+(zNose-zAbsStart);
179 par[8] = zNose * TMath::Tan(theta1);
181 par[9] = par[3]+(zConeTPC-zAbsStart);
183 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(theta2);
185 par[12] = par[3]+(zOpen-zAbsStart);
187 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(accMax);
189 par[15] = par[3]+(zRear-dRear-zAbsStart);
190 par[16] = rAbs + (par[15] - par[12]) * TMath::Tan(thetaOpen1) ;
191 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(accMax);
193 par[18] = par[3]+(zRear-dRear-zAbsStart);
194 par[19] = (zRear-dRear) * TMath::Tan(accMin);
195 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(accMax);
198 par[22] = zRear* TMath::Tan(accMin);
199 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(accMax);
200 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
201 { // Begin local scope for i
202 for (Int_t i=4; i<18; i+=3) par[i] = 0;
203 } // End local scope for i
204 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
205 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
210 par[4] = par[5] -dSteel;
211 par[7] = par[8] -dSteel;
212 par[10]= par[11]-dSteel;
213 par[13]= par[14]-dSteel;
214 par[16]= par[17]-dSteel;
215 par[19]= par[20]-dSteel;
216 par[22]= par[23]-dSteel;
217 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
218 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
220 // Polyethylene shield
222 cpar[0] = (zRear - zConeTPC) / 2.;
223 cpar[1] = zConeTPC * TMath::Tan(accMax);
224 cpar[2] = cpar[1] + dPoly;
225 cpar[3] = zRear * TMath::Tan(accMax);
226 cpar[4] = cpar[3] + dPoly;
227 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
228 dz = (zRear-zAbsStart)/2.-cpar[0];
229 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
232 // Tungsten nose to protect TPC
234 cpar[0] = (zNose - zAbsStart) / 2.;
235 cpar[1] = zAbsStart * TMath::Tan(accMax);
236 cpar[2] = zAbsStart * TMath::Tan(theta1)-dSteel;
237 cpar[3] = zNose * TMath::Tan(accMax);
238 cpar[4] = zNose * TMath::Tan(theta1)-dSteel;
239 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
241 dz = -(zRear-zAbsStart)/2.+cpar[0];
242 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
244 // Tungsten inner shield
246 Float_t zW = zTwoDeg+.1;
247 Float_t dZ = zW+(zRear-dRear-zW)/2.;
254 pcpar[5] = zW * TMath::Tan(accMin);
257 pcpar[8] = zOpen * TMath::Tan(accMin);
258 pcpar[9] = zRear-dRear-dZ;
259 pcpar[10] = rAbs+(zRear-dRear-zOpen) * TMath::Tan(thetaOpen1);
260 pcpar[11] = (zRear-dRear) * TMath::Tan(accMin);
262 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
263 dz=(zW+zRear-dRear)/2-(zAbsStart+zRear)/2.;
264 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
266 // First part replaced by Carbon
268 cpar[0] = (200.-zW)/2.;
272 cpar[4] = 200. * TMath::Tan(accMin);
273 gMC->Gsvolu("ACNO", "CONE", idtmed[kC], cpar, 5);
275 gMC->Gspos("ACNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
279 cpar[0] = (zRear-dRear-zWW)/2.;
280 cpar[1] = rAbs + (zWW-zOpen) * TMath::Tan(thetaOpen1);
281 cpar[2] = zWW * TMath::Tan(accMin);
284 gMC->Gsvolu("AWNO", "CONE", idtmed[kCu+40], cpar, 5);
287 gMC->Gspos("AWNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
290 // Inner tracking region
298 pcpar[3] = -(zRear-zAbsStart)/2.;
300 pcpar[5] = zAbsStart * TMath::Tan(accMax);
301 pcpar[6] = pcpar[3]+(zTwoDeg-zAbsStart);
303 pcpar[8] = zTwoDeg * TMath::Tan(accMax);
304 pcpar[9] = -pcpar[3];
305 pcpar[10] = zRear * TMath::Tan(accMin);
306 pcpar[11] = zRear * TMath::Tan(accMax);
307 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
309 // special Pb medium for last 5 cm of Pb
310 Float_t zr=zRear-2.-0.001;
312 cpar[1] = zr * TMath::Tan(thetaR);
313 cpar[2] = zr * TMath::Tan(accMax);
314 cpar[3] = cpar[1] + TMath::Tan(thetaR) * 2;
315 cpar[4] = cpar[2] + TMath::Tan(accMax) * 2;
316 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
317 dz=(zRear-zAbsStart)/2.-cpar[0]-0.001;
318 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
320 // concrete cone: concrete
322 pcpar[9] = pcpar[3]+(zRear-dRear-zAbsStart);
323 pcpar[10] = (zRear-dRear) * TMath::Tan(accMin);
324 pcpar[11] = (zRear-dRear) * TMath::Tan(accMax);
325 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
326 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
330 zr = zRear-dRear-dzFe;
332 cpar[1] = zr * TMath::Tan(accMin);
333 cpar[2] = zr * TMath::Tan(accMax);
334 cpar[3] = cpar[1] + TMath::Tan(accMin) * dzFe;
335 cpar[4] = cpar[2] + TMath::Tan(accMax) * dzFe;
336 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
338 dz = (zRear-zAbsStart)/2.-dRear-dzFe/2.;
340 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
345 // carbon cone: carbon
347 pcpar[9] = pcpar[3]+(zAbsCc-zAbsStart);
348 pcpar[10] = zAbsCc * TMath::Tan(accMin);
349 pcpar[11] = zAbsCc * TMath::Tan(accMax);
350 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
351 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
353 // carbon cone outer region
357 cpar[2] = zAbsStart* TMath::Tan(accMax);
359 cpar[4] = cpar[2]+2. * cpar[0] * TMath::Tan(accMax);
361 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
362 dz=-(zRear-zAbsStart)/2.+cpar[0];
363 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
369 zr=zRear-(dRear-epsi);
370 cpar[0] = (dRear-epsi)/2.;
371 cpar[1] = zr * TMath::Tan(accMin);
372 cpar[2] = zr * TMath::Tan(thetaR*repsi);
373 cpar[3] = cpar[1] + TMath::Tan(accMin) * (dRear-epsi);
374 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * (dRear-epsi);
375 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
376 dz=(zRear-zAbsStart)/2.-cpar[0];
377 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
379 // special W medium for last 5 cm of W
382 cpar[1] = zr * TMath::Tan(accMin);
383 cpar[2] = zr * TMath::Tan(thetaR*repsi);
384 cpar[3] = cpar[1] + TMath::Tan(accMin) * 5.;
385 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * 5.;
386 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
387 dz=(dRear-epsi)/2.-cpar[0];
388 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
391 Float_t drMin=TMath::Tan(thetaR) * 5;
392 Float_t drMax=TMath::Tan(accMax) * 5;
393 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
395 { // Begin local scope for i
396 for (Int_t i=0; i<3; i++) {
397 zr=zRear-dRear+5+i*10.;
398 cpar[1] = zr * TMath::Tan(thetaR);
399 cpar[2] = zr * TMath::Tan(accMax);
400 cpar[3] = cpar[1] + drMin;
401 cpar[4] = cpar[2] + drMax;
402 dz=(zRear-zAbsStart)/2.-cpar[0]-5.-(2-i)*10;
403 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
405 } // End local scope for i
406 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
407 dz = (zRear-zAbsStart)/2.+zAbsStart;
408 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
413 // pipe and heating jackets
417 tpar0[2]=(zOpen-zAbsStart)/2;
419 tpar0[1]=rVacu+dTube+dInsu+dEnve;
420 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
426 tpar[1]=tpar[0]+dInsu;
427 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
428 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
430 dz=-(zRear-zAbsStart)/2.+tpar0[2];
431 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
435 cpar0[0]=(zRear-dRear-zOpen)/2;
436 cpar0[1]= rVacu-0.05;
437 cpar0[2]= rVacu+dTube+dInsu+dEnve;
438 Float_t dR=2.*cpar0[0]*TMath::Tan(thetaOpen1);
439 cpar0[3]=cpar0[1]+dR;
440 cpar0[4]=cpar0[2]+dR;
441 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
447 cpar[1]=cpar0[1]+dTube;
448 cpar[2]=cpar0[1]+dTube+dInsu;
449 cpar[3]=cpar0[3]+dTube;
450 cpar[4]=cpar0[3]+dTube+dInsu;
451 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
452 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
454 dz=(zRear-zAbsStart)/2.-cpar0[0]-dRear;
455 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
481 gMC->Gsvolu("ASSS", "PGON", idtmed[kAl], par, 16);
482 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
485 trap[ 0] = (530.-170.)/2.;
488 trap[ 4] = (600.-(zRear+2.))/2.;;
495 trap[ 1] = -TMath::ATan((trap[4]-trap[8])/2./trap[0])*180./TMath::Pi();
496 AliMatrix(idrotm[1600], 180., 0., 90., 0., 90., 90.);
497 AliMatrix(idrotm[1601], 180., 0., 90., 0., 90., 270.);
498 gMC->Gsvolu("ASST", "TRAP", idtmed[kSteel], trap, 11);
499 dz = (600.+zRear+2.)/2.+(trap[4]-trap[8])/2.;
500 Float_t dy = 170.+trap[0];
502 // gMC->Gspos("ASST", 1, "ALIC", 0., dy, dz, idrotm[1600], "ONLY");
503 // gMC->Gspos("ASST", 2, "ALIC", 0., -dy, dz, idrotm[1601], "ONLY");
506 //_____________________________________________________________________________
508 void AliABSOv0::Init()
511 // Initialisation of the muon absorber after it has been built
515 printf("\n%s: ",ClassName());
516 for(i=0;i<35;i++) printf("*");
517 printf(" ABSOv0_INIT ");
518 for(i=0;i<35;i++) printf("*");
519 printf("\n%s: ",ClassName());
521 for(i=0;i<80;i++) printf("*");