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 ///////////////////////////////////////////////////////////////////////////////
21 // This class contains the description of the muon absorber geometry //
25 <img src="picts/AliABSOClass.gif">
28 <font size=+2 color=red>
29 <p>The responsible person for this module is
30 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
37 ///////////////////////////////////////////////////////////////////////////////
39 #include <TVirtualMC.h>
41 #include "AliABSOv0.h"
47 //_____________________________________________________________________________
48 AliABSOv0::AliABSOv0()
51 // Default constructor
55 //_____________________________________________________________________________
56 AliABSOv0::AliABSOv0(const char *name, const char *title)
60 // Standard constructor
67 //_____________________________________________________________________________
68 void AliABSOv0::CreateGeometry()
71 // Creation of the geometry of the muon absorber
75 <img src="picts/AliABSOv0Tree.gif">
80 <img src="picts/AliABSOv0.gif">
87 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
88 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
89 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
91 Int_t *idtmed = fIdtmed->GetArray()-1599;
93 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
96 #include "ABSOSHILConst.h"
97 #include "ABSOConst.h"
99 // Structure of Tracking Region
105 fMLayers[0][0] = kAir; fZLayers[0][0] = kZAbsStart;
106 fMLayers[0][1] = kC; fZLayers[0][1] = kZAbsCc;
107 fMLayers[0][2] = kConcrete; fZLayers[0][2] = kZRear - kDRear - dzFe;
108 fMLayers[0][3] = kSteel; fZLayers[0][3] = kZRear - kDRear;
109 fMLayers[0][4] = kSteel; fZLayers[0][4] = kZRear;
113 fMLayers[1][0] = kAir ; fZLayers[1][0] = fZLayers[0][0] - 10.;
114 fMLayers[1][1] = kAl ; fZLayers[1][1] = fZLayers[0][0];
115 fMLayers[1][2] = fMLayers[0][1]; fZLayers[1][2] = fZLayers[0][1];
116 fMLayers[1][3] = fMLayers[0][2]; fZLayers[1][3] = fZLayers[0][2];
117 fMLayers[1][4] = fMLayers[0][3]; fZLayers[1][4] = fZLayers[0][3];
118 fMLayers[1][5] = kNiCuW; fZLayers[1][5] = fZLayers[0][4];
121 Float_t dTube = 0.1; // tube thickness
122 Float_t dInsu = 0.5; // insulation thickness
123 Float_t dEnve = 0.1; // protective envelope thickness
126 // Mother volume and outer shielding: Pb
131 par[21] = (kZRear - kZAbsStart) / 2.;
133 par[23] = kZAbsStart * TMath::Tan(kTheta1);
135 par[18] = par[21] - (kZNose - kZAbsStart);
137 par[20] = kZNose * TMath::Tan(kTheta1);
139 par[15] = par[21] - (kZConeTPC - kZAbsStart);
141 par[17] = par[20] - (par[15] - par[18]) * TMath::Tan(kTheta2);
143 par[12] = par[21] - (kZOpen - kZAbsStart);
145 par[14] = par[17] - (par[12] - par[15]) * TMath::Tan(kAccMax);
147 par[9] = par[21] - (kZRear - kDRear - kZAbsStart);
148 par[10] = kRAbs - (par[9] - par[12]) * TMath::Tan(kThetaOpen1) ;
149 par[11] = par[14] - (par[9] - par[12]) * TMath::Tan(kAccMax);
151 par[6] = par[21] - (kZRear - kDRear - kZAbsStart);
152 par[7] = (kZRear - kDRear) * TMath::Tan(kAccMin);
153 par[8] = par[14] - (par[6] - par[12]) * TMath::Tan(kAccMax);
156 par[4] = kZRear * TMath::Tan(kAccMin);
157 par[5] = par[8] - (par[3] - par[6]) * TMath::Tan(kAccMax);
158 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
160 for (Int_t i = 22; i > 7; i -= 3) par[i] = 0;
162 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
163 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
168 par[4] = par[5] - kDSteel;
169 par[7] = par[8] - kDSteel;
170 par[10]= par[11] - kDSteel;
171 par[13]= par[14] - kDSteel;
172 par[16]= par[17] - kDSteel;
173 par[19]= par[20] - kDSteel;
174 par[22]= par[23] - kDSteel;
176 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
177 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
179 // Polyethylene shield
181 cpar[0] = (kZRear - kZConeTPC) / 2.;
182 cpar[1] = kZRear * TMath::Tan(kAccMax);
183 cpar[2] = cpar[1] + kDPoly;
184 cpar[3] = kZConeTPC * TMath::Tan(kAccMax);
185 cpar[4] = cpar[3] + kDPoly;
187 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
188 dz = - (kZRear - kZAbsStart) / 2. + cpar[0];
189 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
192 // Tungsten nose to protect TPC
194 cpar[0] = (kZNose - kZAbsStart) / 2.;
195 cpar[1] = kZNose * TMath::Tan(kAccMax);
196 cpar[2] = kZNose * TMath::Tan(kTheta1) - kDSteel;
197 cpar[3] = kZAbsStart * TMath::Tan(kAccMax);
198 cpar[4] = kZAbsStart * TMath::Tan(kTheta1) - kDSteel;
200 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
202 dz = (kZRear - kZAbsStart) / 2. - cpar[0];
203 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
205 // Tungsten inner shield
207 Float_t zW = kZTwoDeg + .1;
208 Float_t dZ = zW + (kZRear - kDRear - zW) / 2.;
213 pcpar[9] = - (zW - dZ);
215 pcpar[11] = zW * TMath::Tan(kAccMin);
216 pcpar[6] = - (kZOpen - dZ);
218 pcpar[8] = kZOpen * TMath::Tan(kAccMin);
219 pcpar[3] = - (kZRear - kDRear - dZ);
220 pcpar[4] = kRAbs + (kZRear - kDRear - kZOpen) * TMath::Tan(kThetaOpen1);
221 pcpar[5] = (kZRear - kDRear) * TMath::Tan(kAccMin);
223 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
224 dz = -(zW + kZRear - kDRear) / 2 + (kZAbsStart + kZRear) / 2.;
225 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
227 // First part replaced by Carbon
229 cpar[0] = (200.-zW)/2.;
232 cpar[2] = 200. * TMath::Tan(kAccMin);
236 gMC->Gsvolu("ACNO", "CONE", idtmed[kC], cpar, 5);
237 dz = - (zW - dZ+cpar[0]);
238 gMC->Gspos("ACNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
242 cpar[0] = (kZRear-kDRear-zWW)/2.;
243 cpar[1] = kRAbs + (zWW-kZOpen) * TMath::Tan(kThetaOpen1);
244 cpar[2] = zWW * TMath::Tan(kAccMin);
247 gMC->Gsvolu("AWNO", "CONE", idtmed[kCu+40], cpar, 5);
250 gMC->Gspos("AWNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
253 // Inner tracking region
260 pcpar[9] = (kZRear - kZAbsStart) / 2.;
262 pcpar[11] = kZAbsStart * TMath::Tan(kAccMax);
263 pcpar[6] = pcpar[9] - (kZTwoDeg - kZAbsStart);
265 pcpar[8] = kZTwoDeg * TMath::Tan(kAccMax);
266 pcpar[3] = - pcpar[9];
267 pcpar[4] = kZRear * TMath::Tan(kAccMin);
268 pcpar[5] = kZRear * TMath::Tan(kAccMax);
269 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
271 // special Pb medium for last 5 cm of Pb
272 Float_t zr = kZRear - 2. - 0.001;
274 cpar[3] = zr * TMath::Tan(kThetaR);
275 cpar[4] = zr * TMath::Tan(kAccMax);
276 cpar[1] = cpar[3] + TMath::Tan(kThetaR) * 2;
277 cpar[2] = cpar[4] + TMath::Tan(kAccMax) * 2;
279 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
280 dz= - (kZRear - kZAbsStart) / 2. + cpar[0] - 0.001;
281 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
283 // concrete cone: concrete
285 pcpar[3] = pcpar[9] - (kZRear - kDRear - kZAbsStart);
286 pcpar[4] = (kZRear-kDRear) * TMath::Tan(kAccMin);
287 pcpar[5] = (kZRear-kDRear) * TMath::Tan(kAccMax);
288 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
289 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
293 zr = kZRear - kDRear - dzFe;
296 cpar[3] = zr * TMath::Tan(kAccMin);
297 cpar[4] = zr * TMath::Tan(kAccMax);
298 cpar[1] = cpar[3] + TMath::Tan(kAccMin) * dzFe;
299 cpar[2] = cpar[4] + TMath::Tan(kAccMax) * dzFe;
301 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
303 dz = - (kZRear - kZAbsStart) / 2. + kDRear + dzFe / 2.;
305 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
310 // carbon cone: carbon
312 pcpar[3] = pcpar[9] - (kZAbsCc - kZAbsStart);
313 pcpar[4] = kZAbsCc * TMath::Tan(kAccMin);
314 pcpar[5] = kZAbsCc * TMath::Tan(kAccMax);
315 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
316 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
318 // carbon cone outer region
322 cpar[4] = kZAbsStart * TMath::Tan(kAccMax);
324 cpar[2] = cpar[4] + 2. * cpar[0] * TMath::Tan(kAccMax);
326 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
327 dz= (kZRear-kZAbsStart) / 2. - cpar[0];
328 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
334 zr = kZRear - (kDRear - epsi);
335 cpar[0] = (kDRear - epsi) / 2.;
336 cpar[3] = zr * TMath::Tan(kAccMin);
337 cpar[4] = zr * TMath::Tan(kThetaR * repsi);
338 cpar[1] = cpar[3] + TMath::Tan(kAccMin) * (kDRear - epsi);
339 cpar[2] = cpar[4] + TMath::Tan(kThetaR * repsi) * (kDRear - epsi);
341 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
342 dz= - (kZRear - kZAbsStart) / 2. + cpar[0];
343 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
345 // special W medium for last 5 cm of W
348 cpar[3] = zr * TMath::Tan(kAccMin);
349 cpar[4] = zr * TMath::Tan(kThetaR * repsi);
350 cpar[1] = cpar[3] + TMath::Tan(kAccMin) * 5.;
351 cpar[2] = cpar[4] + TMath::Tan(kThetaR*repsi) * 5.;
353 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
354 dz = - (kDRear-epsi) / 2. + cpar[0];
355 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
358 Float_t drMin = TMath::Tan(kThetaR) * 5;
359 Float_t drMax = TMath::Tan(kAccMax) * 5;
360 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
363 for (Int_t i = 0; i < 3; i++) {
364 zr = kZRear - kDRear + 5 + i * 10.;
365 cpar[3] = zr * TMath::Tan(kThetaR);
366 cpar[4] = zr * TMath::Tan(kAccMax);
367 cpar[1] = cpar[3] + drMin;
368 cpar[2] = cpar[4] + drMax;
369 dz = - (kZRear - kZAbsStart) / 2. + cpar[0] + 5. + (2 - i)*10;
370 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
373 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
374 dz = - (kZRear - kZAbsStart) / 2. - kZAbsStart;
375 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
380 // pipe and heating jackets
384 tpar0[2] = (kZOpen-kZAbsStart)/2;
386 tpar0[1] = kRVacu + dTube + dInsu + dEnve;
387 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
392 tpar[0] = kRVacu + dTube;
393 tpar[1] = tpar[0] + dInsu;
394 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
395 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
397 dz = (kZRear - kZAbsStart) / 2. - tpar0[2];
398 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
402 cpar0[0] = (kZRear - kDRear - kZOpen) / 2.;
403 cpar0[3] = kRVacu - 0.05;
404 cpar0[4] = kRVacu + dTube + dInsu + dEnve;
405 Float_t dR = 2. * cpar0[0] * TMath::Tan(kThetaOpen1);
406 cpar0[1]=cpar0[3] + dR;
407 cpar0[2]=cpar0[4] + dR;
408 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
414 cpar[1] = cpar0[1] + dTube;
415 cpar[2] = cpar0[1] + dTube + dInsu;
416 cpar[3] = cpar0[3] + dTube;
417 cpar[4] = cpar0[3] + dTube + dInsu;
419 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
420 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
422 dz = - (kZRear - kZAbsStart) / 2. + cpar0[0] + kDRear;
423 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
436 par[10] = - kZRear - 20.;
440 par[7] = - kZRear - 20.;
449 gMC->Gsvolu("ASSS", "PGON", idtmed[kAl], par, 16);
450 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
453 trap[ 0] = (530. - 170.) / 2.;
456 trap[ 4] = (600. - (kZRear + 2.)) / 2.;;
463 trap[ 1] = -TMath::ATan((trap[4] - trap[8]) / 2. / trap[0]) * 180. / TMath::Pi();
464 AliMatrix(idrotm[1600], 180., 0., 90., 0., 90., 90.);
465 AliMatrix(idrotm[1601], 180., 0., 90., 0., 90., 270.);
466 gMC->Gsvolu("ASST", "TRAP", idtmed[kSteel], trap, 11);
467 //PH dz = (600.+kZRear+2.)/2.+(trap[4]-trap[8])/2.;
468 //PH Float_t dy = 170.+trap[0];
470 // gMC->Gspos("ASST", 1, "ALIC", 0., dy, - dz, idrotm[1600], "ONLY");
471 // gMC->Gspos("ASST", 2, "ALIC", 0., -dy, - dz, idrotm[1601], "ONLY");
474 //_____________________________________________________________________________
476 void AliABSOv0::Init()
479 // Initialisation of the muon absorber after it has been built
483 printf("\n%s: ",ClassName());
484 for(i=0;i<35;i++) printf("*");
485 printf(" ABSOv0_INIT ");
486 for(i=0;i<35;i++) printf("*");
487 printf("\n%s: ",ClassName());
489 for(i=0;i<80;i++) printf("*");