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 2001/11/29 14:16:51 morsch
19 - truncated inner W-cone
20 - new support structure
22 Revision 1.10 2001/10/25 08:50:57 morsch
23 New beamshield geometry with increased tolerances and insulation thickness.
25 Revision 1.9 2001/05/16 14:57:22 alibrary
26 New files for folders and Stack
28 Revision 1.8 2001/01/12 13:16:09 morsch
29 Store absorber composition information in fMLayers and fZLayers
30 Rear 25 cm Fe + 35 cm Cu
32 Revision 1.7 2000/10/02 21:28:15 fca
33 Removal of useless dependecies via forward declarations
35 Revision 1.6 2000/06/15 09:40:31 morsch
36 Obsolete typedef keyword removed
38 Revision 1.5 2000/06/12 19:39:01 morsch
39 New structure of beam pipe and heating jacket.
41 Revision 1.4 2000/04/03 08:13:40 fca
42 Introduce extra scope for non ANSI compliant C++ compilers
44 Revision 1.3 2000/01/18 17:49:56 morsch
45 Serious overlap of ABSM with shield corrected
46 Small error in ARPB parameters corrected
48 Revision 1.2 2000/01/13 11:23:59 morsch
49 Last layer of Pb outer angle corrected
51 Revision 1.1 2000/01/12 15:39:30 morsch
52 Standard version of ABSO
56 ///////////////////////////////////////////////////////////////////////////////
59 // This class contains the description of the muon absorber geometry //
63 <img src="picts/AliABSOClass.gif">
66 <font size=+2 color=red>
67 <p>The responsible person for this module is
68 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
75 ///////////////////////////////////////////////////////////////////////////////
77 #include "AliABSOv0.h"
84 //_____________________________________________________________________________
85 AliABSOv0::AliABSOv0()
88 // Default constructor
92 //_____________________________________________________________________________
93 AliABSOv0::AliABSOv0(const char *name, const char *title)
97 // Standard constructor
104 //_____________________________________________________________________________
105 void AliABSOv0::CreateGeometry()
108 // Creation of the geometry of the muon absorber
112 <img src="picts/AliABSOv0Tree.gif">
117 <img src="picts/AliABSOv0.gif">
124 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
125 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
126 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
128 Int_t *idtmed = fIdtmed->GetArray()-1599;
130 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
133 #include "ABSOSHILConst.h"
134 #include "ABSOConst.h"
136 // Structure of Tracking Region
142 fMLayers[0][0] = kAir; fZLayers[0][0] = zAbsStart;
143 fMLayers[0][1] = kC; fZLayers[0][1] = zAbsCc;
144 fMLayers[0][2] = kConcrete; fZLayers[0][2] = zRear-dRear-dzFe;
145 fMLayers[0][3] = kSteel; fZLayers[0][3] = zRear-dRear;
146 fMLayers[0][4] = kSteel; fZLayers[0][4] = zRear;
149 fMLayers[1][0] = fMLayers[0][0]; fZLayers[1][0] = fZLayers[0][0];
150 fMLayers[1][1] = fMLayers[0][1]; fZLayers[1][1] = fZLayers[0][1];
151 fMLayers[1][2] = fMLayers[0][2]; fZLayers[1][2] = fZLayers[0][2];
152 fMLayers[1][3] = fMLayers[0][3]; fZLayers[1][3] = fZLayers[0][3];
153 fMLayers[1][4] = kNiCuW; fZLayers[1][4] = fZLayers[0][4];
156 Float_t dTube=0.1; // tube thickness
157 Float_t dInsu=0.5; // insulation thickness
158 Float_t dEnve=0.1; // protective envelope thickness
159 Float_t dFree=0.5; // clearance thickness
162 // Mother volume and outer shielding: Pb
167 par[3] = -(zRear-zAbsStart)/2.;
169 par[5] = zAbsStart * TMath::Tan(theta1);
171 par[6] = par[3]+(zNose-zAbsStart);
173 par[8] = zNose * TMath::Tan(theta1);
175 par[9] = par[3]+(zConeTPC-zAbsStart);
177 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(theta2);
179 par[12] = par[3]+(zOpen-zAbsStart);
181 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(accMax);
183 par[15] = par[3]+(zRear-dRear-zAbsStart);
184 par[16] = rAbs + (par[15] - par[12]) * TMath::Tan(thetaOpen1) ;
185 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(accMax);
187 par[18] = par[3]+(zRear-dRear-zAbsStart);
188 par[19] = (zRear-dRear) * TMath::Tan(accMin);
189 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(accMax);
192 par[22] = zRear* TMath::Tan(accMin);
193 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(accMax);
194 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
195 { // Begin local scope for i
196 for (Int_t i=4; i<18; i+=3) par[i] = 0;
197 } // End local scope for i
198 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
199 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
204 par[4] = par[5] -dSteel;
205 par[7] = par[8] -dSteel;
206 par[10]= par[11]-dSteel;
207 par[13]= par[14]-dSteel;
208 par[16]= par[17]-dSteel;
209 par[19]= par[20]-dSteel;
210 par[22]= par[23]-dSteel;
211 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
212 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
214 // Polyethylene shield
216 cpar[0] = (zRear - zConeTPC) / 2.;
217 cpar[1] = zConeTPC * TMath::Tan(accMax);
218 cpar[2] = cpar[1] + dPoly;
219 cpar[3] = zRear * TMath::Tan(accMax);
220 cpar[4] = cpar[3] + dPoly;
221 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
222 dz = (zRear-zAbsStart)/2.-cpar[0];
223 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
226 // Tungsten nose to protect TPC
228 cpar[0] = (zNose - zAbsStart) / 2.;
229 cpar[1] = zAbsStart * TMath::Tan(accMax);
230 cpar[2] = zAbsStart * TMath::Tan(theta1)-dSteel;
231 cpar[3] = zNose * TMath::Tan(accMax);
232 cpar[4] = zNose * TMath::Tan(theta1)-dSteel;
233 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
235 dz = -(zRear-zAbsStart)/2.+cpar[0];
236 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
238 // Tungsten inner shield
240 Float_t zW = zTwoDeg+.1;
241 Float_t dZ = zW+(zRear-dRear-zW)/2.;
248 pcpar[5] = zW * TMath::Tan(accMin);
251 pcpar[8] = zOpen * TMath::Tan(accMin);
252 pcpar[9] = zRear-dRear-dZ;
253 pcpar[10] = rAbs+(zRear-dRear-zOpen) * TMath::Tan(thetaOpen1);
254 pcpar[11] = (zRear-dRear) * TMath::Tan(accMin);
256 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
257 dz=(zW+zRear-dRear)/2-(zAbsStart+zRear)/2.;
258 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
260 // First part replaced by Carbon
262 cpar[0] = (200.-zW)/2.;
266 cpar[4] = 200. * TMath::Tan(accMin);
267 gMC->Gsvolu("ACNO", "CONE", idtmed[kC], cpar, 5);
269 gMC->Gspos("ACNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
273 cpar[0] = (zRear-dRear-zWW)/2.;
274 cpar[1] = rAbs + (zWW-zOpen) * TMath::Tan(thetaOpen1);
275 cpar[2] = zWW * TMath::Tan(accMin);
278 gMC->Gsvolu("AWNO", "CONE", idtmed[kCu+40], cpar, 5);
281 gMC->Gspos("AWNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
284 // Inner tracking region
292 pcpar[3] = -(zRear-zAbsStart)/2.;
294 pcpar[5] = zAbsStart * TMath::Tan(accMax);
295 pcpar[6] = pcpar[3]+(zTwoDeg-zAbsStart);
297 pcpar[8] = zTwoDeg * TMath::Tan(accMax);
298 pcpar[9] = -pcpar[3];
299 pcpar[10] = zRear * TMath::Tan(accMin);
300 pcpar[11] = zRear * TMath::Tan(accMax);
301 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
303 // special Pb medium for last 5 cm of Pb
304 Float_t zr=zRear-2.-0.001;
306 cpar[1] = zr * TMath::Tan(thetaR);
307 cpar[2] = zr * TMath::Tan(accMax);
308 cpar[3] = cpar[1] + TMath::Tan(thetaR) * 2;
309 cpar[4] = cpar[2] + TMath::Tan(accMax) * 2;
310 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
311 dz=(zRear-zAbsStart)/2.-cpar[0]-0.001;
312 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
314 // concrete cone: concrete
316 pcpar[9] = pcpar[3]+(zRear-dRear-zAbsStart);
317 pcpar[10] = (zRear-dRear) * TMath::Tan(accMin);
318 pcpar[11] = (zRear-dRear) * TMath::Tan(accMax);
319 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
320 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
324 zr = zRear-dRear-dzFe;
326 cpar[1] = zr * TMath::Tan(accMin);
327 cpar[2] = zr * TMath::Tan(accMax);
328 cpar[3] = cpar[1] + TMath::Tan(accMin) * dzFe;
329 cpar[4] = cpar[2] + TMath::Tan(accMax) * dzFe;
330 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
332 dz = (zRear-zAbsStart)/2.-dRear-dzFe/2.;
334 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
339 // carbon cone: carbon
341 pcpar[9] = pcpar[3]+(zAbsCc-zAbsStart);
342 pcpar[10] = zAbsCc * TMath::Tan(accMin);
343 pcpar[11] = zAbsCc * TMath::Tan(accMax);
344 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
345 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
347 // carbon cone outer region
351 cpar[2] = zAbsStart* TMath::Tan(accMax);
353 cpar[4] = cpar[2]+2. * cpar[0] * TMath::Tan(accMax);
355 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
356 dz=-(zRear-zAbsStart)/2.+cpar[0];
357 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
363 zr=zRear-(dRear-epsi);
364 cpar[0] = (dRear-epsi)/2.;
365 cpar[1] = zr * TMath::Tan(accMin);
366 cpar[2] = zr * TMath::Tan(thetaR*repsi);
367 cpar[3] = cpar[1] + TMath::Tan(accMin) * (dRear-epsi);
368 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * (dRear-epsi);
369 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
370 dz=(zRear-zAbsStart)/2.-cpar[0];
371 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
373 // special W medium for last 5 cm of W
376 cpar[1] = zr * TMath::Tan(accMin);
377 cpar[2] = zr * TMath::Tan(thetaR*repsi);
378 cpar[3] = cpar[1] + TMath::Tan(accMin) * 5.;
379 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * 5.;
380 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
381 dz=(dRear-epsi)/2.-cpar[0];
382 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
385 Float_t drMin=TMath::Tan(thetaR) * 5;
386 Float_t drMax=TMath::Tan(accMax) * 5;
387 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
389 { // Begin local scope for i
390 for (Int_t i=0; i<3; i++) {
391 zr=zRear-dRear+5+i*10.;
392 cpar[1] = zr * TMath::Tan(thetaR);
393 cpar[2] = zr * TMath::Tan(accMax);
394 cpar[3] = cpar[1] + drMin;
395 cpar[4] = cpar[2] + drMax;
396 dz=(zRear-zAbsStart)/2.-cpar[0]-5.-(2-i)*10;
397 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
399 } // End local scope for i
400 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
401 dz = (zRear-zAbsStart)/2.+zAbsStart;
402 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
407 // pipe and heating jackets
411 tpar0[2]=(zOpen-zAbsStart)/2;
413 tpar0[1]=rVacu+dTube+dInsu+dEnve;
414 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
420 tpar[1]=tpar[0]+dInsu;
421 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
422 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
424 dz=-(zRear-zAbsStart)/2.+tpar0[2];
425 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
429 cpar0[0]=(zRear-dRear-zOpen)/2;
430 cpar0[1]= rVacu-0.05;
431 cpar0[2]= rVacu+dTube+dInsu+dEnve;
432 Float_t dR=2.*cpar0[0]*TMath::Tan(thetaOpen1);
433 cpar0[3]=cpar0[1]+dR;
434 cpar0[4]=cpar0[2]+dR;
435 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
441 cpar[1]=cpar0[1]+dTube;
442 cpar[2]=cpar0[1]+dTube+dInsu;
443 cpar[3]=cpar0[3]+dTube;
444 cpar[4]=cpar0[3]+dTube+dInsu;
445 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
446 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
448 dz=(zRear-zAbsStart)/2.-cpar0[0]-dRear;
449 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
475 gMC->Gsvolu("ASSS", "PGON", idtmed[kAl], par, 16);
476 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
479 trap[ 0] = (530.-170.)/2.;
482 trap[ 4] = (600.-(zRear+2.))/2.;;
489 trap[ 1] = -TMath::ATan((trap[4]-trap[8])/2./trap[0])*180./TMath::Pi();
490 AliMatrix(idrotm[1600], 180., 0., 90., 0., 90., 90.);
491 AliMatrix(idrotm[1601], 180., 0., 90., 0., 90., 270.);
492 gMC->Gsvolu("ASST", "TRAP", idtmed[kSteel], trap, 11);
493 dz = (600.+zRear+2.)/2.+(trap[4]-trap[8])/2.;
494 Float_t dy = 170.+trap[0];
496 // gMC->Gspos("ASST", 1, "ALIC", 0., dy, dz, idrotm[1600], "ONLY");
497 // gMC->Gspos("ASST", 2, "ALIC", 0., -dy, dz, idrotm[1601], "ONLY");
500 //_____________________________________________________________________________
502 void AliABSOv0::Init()
505 // Initialisation of the muon absorber after it has been built
509 printf("\n%s: ",ClassName());
510 for(i=0;i<35;i++) printf("*");
511 printf(" ABSOv0_INIT ");
512 for(i=0;i<35;i++) printf("*");
513 printf("\n%s: ",ClassName());
515 for(i=0;i<80;i++) printf("*");