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"
48 //_____________________________________________________________________________
49 AliABSOv0::AliABSOv0()
52 // Default constructor
56 //_____________________________________________________________________________
57 AliABSOv0::AliABSOv0(const char *name, const char *title)
61 // Standard constructor
68 //_____________________________________________________________________________
69 void AliABSOv0::CreateGeometry()
72 // Creation of the geometry of the muon absorber
76 <img src="picts/AliABSOv0Tree.gif">
81 <img src="picts/AliABSOv0.gif">
88 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
89 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
90 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
92 Int_t *idtmed = fIdtmed->GetArray()-1599;
94 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
97 #include "ABSOSHILConst.h"
98 #include "ABSOConst.h"
100 // Structure of Tracking Region
106 fMLayers[0][0] = kAir; fZLayers[0][0] = kZAbsStart;
107 fMLayers[0][1] = kC; fZLayers[0][1] = kZAbsCc;
108 fMLayers[0][2] = kConcrete; fZLayers[0][2] = kZRear - kDRear - dzFe;
109 fMLayers[0][3] = kSteel; fZLayers[0][3] = kZRear - kDRear;
110 fMLayers[0][4] = kSteel; fZLayers[0][4] = kZRear;
114 fMLayers[1][0] = kAir ; fZLayers[1][0] = fZLayers[0][0] - 10.;
115 fMLayers[1][1] = kAl ; fZLayers[1][1] = fZLayers[0][0];
116 fMLayers[1][2] = fMLayers[0][1]; fZLayers[1][2] = fZLayers[0][1];
117 fMLayers[1][3] = fMLayers[0][2]; fZLayers[1][3] = fZLayers[0][2];
118 fMLayers[1][4] = fMLayers[0][3]; fZLayers[1][4] = fZLayers[0][3];
119 fMLayers[1][5] = kNiCuW+40; fZLayers[1][5] = fZLayers[0][4];
122 Float_t dTube = 0.1; // tube thickness
123 Float_t dInsu = 0.5; // insulation thickness
124 Float_t dEnve = 0.1; // protective envelope thickness
127 // Mother volume and outer shielding: Pb
132 par[21] = (kZRear - kZAbsStart) / 2.;
134 par[23] = kZAbsStart * TMath::Tan(kTheta1);
136 par[18] = par[21] - (kZNose - kZAbsStart);
138 par[20] = kZNose * TMath::Tan(kTheta1);
140 par[15] = par[21] - (kZConeTPC - kZAbsStart);
142 par[17] = par[20] - (par[15] - par[18]) * TMath::Tan(kTheta2);
144 par[12] = par[21] - (kZOpen - kZAbsStart);
146 par[14] = par[17] - (par[12] - par[15]) * TMath::Tan(kAccMax);
148 par[9] = par[21] - (kZRear - kDRear - kZAbsStart);
149 par[10] = kRAbs - (par[9] - par[12]) * TMath::Tan(kThetaOpen1) ;
150 par[11] = par[14] - (par[9] - par[12]) * TMath::Tan(kAccMax);
152 par[6] = par[21] - (kZRear - kDRear - kZAbsStart);
153 par[7] = (kZRear - kDRear) * TMath::Tan(kAccMin);
154 par[8] = par[14] - (par[6] - par[12]) * TMath::Tan(kAccMax);
157 par[4] = kZRear * TMath::Tan(kAccMin);
158 par[5] = par[8] - (par[3] - par[6]) * TMath::Tan(kAccMax);
159 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb+40], par, 24);
161 for (Int_t i = 22; i > 7; i -= 3) par[i] = 0;
163 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
164 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
169 par[4] = par[5] - kDSteel;
170 par[7] = par[8] - kDSteel;
171 par[10]= par[11] - kDSteel;
172 par[13]= par[14] - kDSteel;
173 par[16]= par[17] - kDSteel;
174 par[19]= par[20] - kDSteel;
175 par[22]= par[23] - kDSteel;
177 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
178 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
180 // Polyethylene shield
182 cpar[0] = (kZRear - kZConeTPC) / 2.;
183 cpar[1] = kZRear * TMath::Tan(kAccMax);
184 cpar[2] = cpar[1] + kDPoly;
185 cpar[3] = kZConeTPC * TMath::Tan(kAccMax);
186 cpar[4] = cpar[3] + kDPoly;
188 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
189 dz = - (kZRear - kZAbsStart) / 2. + cpar[0];
190 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
193 // Tungsten nose to protect TPC
195 cpar[0] = (kZNose - kZAbsStart) / 2.;
196 cpar[1] = kZNose * TMath::Tan(kAccMax);
197 cpar[2] = kZNose * TMath::Tan(kTheta1) - kDSteel;
198 cpar[3] = kZAbsStart * TMath::Tan(kAccMax);
199 cpar[4] = kZAbsStart * TMath::Tan(kTheta1) - kDSteel;
201 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
203 dz = (kZRear - kZAbsStart) / 2. - cpar[0];
204 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
206 // Tungsten inner shield
208 Float_t zW = kZTwoDeg + .1;
209 Float_t dZ = zW + (kZRear - kDRear - zW) / 2.;
214 pcpar[9] = - (zW - dZ);
216 pcpar[11] = zW * TMath::Tan(kAccMin);
217 pcpar[6] = - (kZOpen - dZ);
219 pcpar[8] = kZOpen * TMath::Tan(kAccMin);
220 pcpar[3] = - (kZRear - kDRear - dZ);
221 pcpar[4] = kRAbs + (kZRear - kDRear - kZOpen) * TMath::Tan(kThetaOpen1);
222 pcpar[5] = (kZRear - kDRear) * TMath::Tan(kAccMin);
224 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
225 dz = -(zW + kZRear - kDRear) / 2 + (kZAbsStart + kZRear) / 2.;
226 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
228 // First part replaced by Carbon
230 cpar[0] = (200.-zW)/2.;
233 cpar[2] = 200. * TMath::Tan(kAccMin);
237 gMC->Gsvolu("ACNO", "CONE", idtmed[kC], cpar, 5);
238 dz = - (zW - dZ+cpar[0]);
239 gMC->Gspos("ACNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
243 cpar[0] = (kZRear-kDRear-zWW)/2.;
244 cpar[1] = kRAbs + (zWW-kZOpen) * TMath::Tan(kThetaOpen1);
245 cpar[2] = zWW * TMath::Tan(kAccMin);
248 gMC->Gsvolu("AWNO", "CONE", idtmed[kCu+40], cpar, 5);
251 gMC->Gspos("AWNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
254 // Inner tracking region
261 pcpar[9] = (kZRear - kZAbsStart) / 2.;
263 pcpar[11] = kZAbsStart * TMath::Tan(kAccMax);
264 pcpar[6] = pcpar[9] - (kZTwoDeg - kZAbsStart);
266 pcpar[8] = kZTwoDeg * TMath::Tan(kAccMax);
267 pcpar[3] = - pcpar[9];
268 pcpar[4] = kZRear * TMath::Tan(kAccMin);
269 pcpar[5] = kZRear * TMath::Tan(kAccMax);
270 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
272 // special Pb medium for last 5 cm of Pb
273 Float_t zr = kZRear - 2. - 0.001;
275 cpar[3] = zr * TMath::Tan(kThetaR);
276 cpar[4] = zr * TMath::Tan(kAccMax);
277 cpar[1] = cpar[3] + TMath::Tan(kThetaR) * 2;
278 cpar[2] = cpar[4] + TMath::Tan(kAccMax) * 2;
280 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
281 dz= - (kZRear - kZAbsStart) / 2. + cpar[0] - 0.001;
282 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
284 // concrete cone: concrete
286 pcpar[3] = pcpar[9] - (kZRear - kDRear - kZAbsStart);
287 pcpar[4] = (kZRear-kDRear) * TMath::Tan(kAccMin);
288 pcpar[5] = (kZRear-kDRear) * TMath::Tan(kAccMax);
289 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
290 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
294 zr = kZRear - kDRear - dzFe;
297 cpar[3] = zr * TMath::Tan(kAccMin);
298 cpar[4] = zr * TMath::Tan(kAccMax);
299 cpar[1] = cpar[3] + TMath::Tan(kAccMin) * dzFe;
300 cpar[2] = cpar[4] + TMath::Tan(kAccMax) * dzFe;
302 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
304 dz = - (kZRear - kZAbsStart) / 2. + kDRear + dzFe / 2.;
306 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
311 // carbon cone: carbon
313 pcpar[3] = pcpar[9] - (kZAbsCc - kZAbsStart);
314 pcpar[4] = kZAbsCc * TMath::Tan(kAccMin);
315 pcpar[5] = kZAbsCc * TMath::Tan(kAccMax);
316 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
317 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
319 // carbon cone outer region
323 cpar[4] = kZAbsStart * TMath::Tan(kAccMax);
325 cpar[2] = cpar[4] + 2. * cpar[0] * TMath::Tan(kAccMax);
327 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
328 dz= (kZRear-kZAbsStart) / 2. - cpar[0];
329 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
335 zr = kZRear - (kDRear - epsi);
336 cpar[0] = (kDRear - epsi) / 2.;
337 cpar[3] = zr * TMath::Tan(kAccMin);
338 cpar[4] = zr * TMath::Tan(kThetaR * repsi);
339 cpar[1] = cpar[3] + TMath::Tan(kAccMin) * (kDRear - epsi);
340 cpar[2] = cpar[4] + TMath::Tan(kThetaR * repsi) * (kDRear - epsi);
342 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
343 dz= - (kZRear - kZAbsStart) / 2. + cpar[0];
344 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
346 // special W medium for last 5 cm of W
349 cpar[3] = zr * TMath::Tan(kAccMin);
350 cpar[4] = zr * TMath::Tan(kThetaR * repsi);
351 cpar[1] = cpar[3] + TMath::Tan(kAccMin) * 5.;
352 cpar[2] = cpar[4] + TMath::Tan(kThetaR*repsi) * 5.;
354 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
355 dz = - (kDRear-epsi) / 2. + cpar[0];
356 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
359 Float_t drMin = TMath::Tan(kThetaR) * 5;
360 Float_t drMax = TMath::Tan(kAccMax) * 5;
361 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
364 for (Int_t i = 0; i < 3; i++) {
365 zr = kZRear - kDRear + 5 + i * 10.;
366 cpar[3] = zr * TMath::Tan(kThetaR);
367 cpar[4] = zr * TMath::Tan(kAccMax);
368 cpar[1] = cpar[3] + drMin;
369 cpar[2] = cpar[4] + drMax;
370 dz = - (kZRear - kZAbsStart) / 2. + cpar[0] + 5. + (2 - i)*10;
371 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
374 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
375 dz = - (kZRear - kZAbsStart) / 2. - kZAbsStart;
376 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
381 // pipe and heating jackets
385 tpar0[2] = (kZOpen-kZAbsStart)/2;
387 tpar0[1] = kRVacu + dTube + dInsu + dEnve;
388 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
393 tpar[0] = kRVacu + dTube;
394 tpar[1] = tpar[0] + dInsu;
395 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
396 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
398 dz = (kZRear - kZAbsStart) / 2. - tpar0[2];
399 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
403 cpar0[0] = (kZRear - kDRear - kZOpen) / 2.;
404 cpar0[3] = kRVacu - 0.05;
405 cpar0[4] = kRVacu + dTube + dInsu + dEnve;
406 Float_t dR = 2. * cpar0[0] * TMath::Tan(kThetaOpen1);
407 cpar0[1]=cpar0[3] + dR;
408 cpar0[2]=cpar0[4] + dR;
409 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
415 cpar[1] = cpar0[1] + dTube;
416 cpar[2] = cpar0[1] + dTube + dInsu;
417 cpar[3] = cpar0[3] + dTube;
418 cpar[4] = cpar0[3] + dTube + dInsu;
420 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
421 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
423 dz = - (kZRear - kZAbsStart) / 2. + cpar0[0] + kDRear;
424 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
433 par[13] = - kZRear + 20.;
450 gMC->Gsvolu("ASSS", "PGON", idtmed[kAl], par, 16);
451 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
454 trap[ 0] = (530. - 170.) / 2.;
457 trap[ 4] = (600. - (kZRear + 2.)) / 2.;;
464 trap[ 1] = -TMath::ATan((trap[4] - trap[8]) / 2. / trap[0]) * 180. / TMath::Pi();
465 AliMatrix(idrotm[1600], 180., 0., 90., 0., 90., 90.);
466 AliMatrix(idrotm[1601], 180., 0., 90., 0., 90., 270.);
467 gMC->Gsvolu("ASST", "TRAP", idtmed[kSteel], trap, 11);
468 //PH dz = (600.+kZRear+2.)/2.+(trap[4]-trap[8])/2.;
469 //PH Float_t dy = 170.+trap[0];
471 // gMC->Gspos("ASST", 1, "ALIC", 0., dy, - dz, idrotm[1600], "ONLY");
472 // gMC->Gspos("ASST", 2, "ALIC", 0., -dy, - dz, idrotm[1601], "ONLY");
475 //_____________________________________________________________________________
477 void AliABSOv0::Init()
480 // Initialisation of the muon absorber after it has been built
483 if(AliLog::GetGlobalDebugLevel()>0) {
484 printf("\n%s: ",ClassName());
485 for(i=0;i<35;i++) printf("*");
486 printf(" ABSOv0_INIT ");
487 for(i=0;i<35;i++) printf("*");
488 printf("\n%s: ",ClassName());
490 for(i=0;i<80;i++) printf("*");