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
124 // Float_t dFree=0.5; // clearance thickness
127 // Mother volume and outer shielding: Pb
132 par[3] = -(kZRear-kZAbsStart)/2.;
134 par[5] = kZAbsStart * TMath::Tan(kTheta1);
136 par[6] = par[3]+(kZNose-kZAbsStart);
138 par[8] = kZNose * TMath::Tan(kTheta1);
140 par[9] = par[3]+(kZConeTPC-kZAbsStart);
142 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(kTheta2);
144 par[12] = par[3]+(kZOpen-kZAbsStart);
146 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(kAccMax);
148 par[15] = par[3]+(kZRear-kDRear-kZAbsStart);
149 par[16] = kRAbs + (par[15] - par[12]) * TMath::Tan(kThetaOpen1) ;
150 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(kAccMax);
152 par[18] = par[3]+(kZRear-kDRear-kZAbsStart);
153 par[19] = (kZRear-kDRear) * TMath::Tan(kAccMin);
154 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(kAccMax);
157 par[22] = kZRear* TMath::Tan(kAccMin);
158 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(kAccMax);
159 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
160 { // Begin local scope for i
161 for (Int_t i=4; i<18; i+=3) par[i] = 0;
162 } // End local scope for i
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;
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] = kZConeTPC * TMath::Tan(kAccMax);
183 cpar[2] = cpar[1] + kDPoly;
184 cpar[3] = kZRear * TMath::Tan(kAccMax);
185 cpar[4] = cpar[3] + kDPoly;
186 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
187 dz = (kZRear-kZAbsStart)/2.-cpar[0];
188 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
191 // Tungsten nose to protect TPC
193 cpar[0] = (kZNose - kZAbsStart) / 2.;
194 cpar[1] = kZAbsStart * TMath::Tan(kAccMax);
195 cpar[2] = kZAbsStart * TMath::Tan(kTheta1)-kDSteel;
196 cpar[3] = kZNose * TMath::Tan(kAccMax);
197 cpar[4] = kZNose * TMath::Tan(kTheta1)-kDSteel;
198 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
200 dz = -(kZRear-kZAbsStart)/2.+cpar[0];
201 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
203 // Tungsten inner shield
205 Float_t zW = kZTwoDeg+.1;
206 Float_t dZ = zW+(kZRear-kDRear-zW)/2.;
213 pcpar[5] = zW * TMath::Tan(kAccMin);
214 pcpar[6] = kZOpen-dZ;
216 pcpar[8] = kZOpen * TMath::Tan(kAccMin);
217 pcpar[9] = kZRear-kDRear-dZ;
218 pcpar[10] = kRAbs+(kZRear-kDRear-kZOpen) * TMath::Tan(kThetaOpen1);
219 pcpar[11] = (kZRear-kDRear) * TMath::Tan(kAccMin);
221 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
222 dz=(zW+kZRear-kDRear)/2-(kZAbsStart+kZRear)/2.;
223 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
225 // First part replaced by Carbon
227 cpar[0] = (200.-zW)/2.;
231 cpar[4] = 200. * TMath::Tan(kAccMin);
232 gMC->Gsvolu("ACNO", "CONE", idtmed[kC], cpar, 5);
234 gMC->Gspos("ACNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
238 cpar[0] = (kZRear-kDRear-zWW)/2.;
239 cpar[1] = kRAbs + (zWW-kZOpen) * TMath::Tan(kThetaOpen1);
240 cpar[2] = zWW * TMath::Tan(kAccMin);
243 gMC->Gsvolu("AWNO", "CONE", idtmed[kCu+40], cpar, 5);
246 gMC->Gspos("AWNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
249 // Inner tracking region
257 pcpar[3] = -(kZRear-kZAbsStart)/2.;
259 pcpar[5] = kZAbsStart * TMath::Tan(kAccMax);
260 pcpar[6] = pcpar[3]+(kZTwoDeg-kZAbsStart);
262 pcpar[8] = kZTwoDeg * TMath::Tan(kAccMax);
263 pcpar[9] = -pcpar[3];
264 pcpar[10] = kZRear * TMath::Tan(kAccMin);
265 pcpar[11] = kZRear * TMath::Tan(kAccMax);
266 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
268 // special Pb medium for last 5 cm of Pb
269 Float_t zr=kZRear-2.-0.001;
271 cpar[1] = zr * TMath::Tan(kThetaR);
272 cpar[2] = zr * TMath::Tan(kAccMax);
273 cpar[3] = cpar[1] + TMath::Tan(kThetaR) * 2;
274 cpar[4] = cpar[2] + TMath::Tan(kAccMax) * 2;
275 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
276 dz=(kZRear-kZAbsStart)/2.-cpar[0]-0.001;
277 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
279 // concrete cone: concrete
281 pcpar[9] = pcpar[3]+(kZRear-kDRear-kZAbsStart);
282 pcpar[10] = (kZRear-kDRear) * TMath::Tan(kAccMin);
283 pcpar[11] = (kZRear-kDRear) * TMath::Tan(kAccMax);
284 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
285 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
289 zr = kZRear-kDRear-dzFe;
291 cpar[1] = zr * TMath::Tan(kAccMin);
292 cpar[2] = zr * TMath::Tan(kAccMax);
293 cpar[3] = cpar[1] + TMath::Tan(kAccMin) * dzFe;
294 cpar[4] = cpar[2] + TMath::Tan(kAccMax) * dzFe;
295 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
297 dz = (kZRear-kZAbsStart)/2.-kDRear-dzFe/2.;
299 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
304 // carbon cone: carbon
306 pcpar[9] = pcpar[3]+(kZAbsCc-kZAbsStart);
307 pcpar[10] = kZAbsCc * TMath::Tan(kAccMin);
308 pcpar[11] = kZAbsCc * TMath::Tan(kAccMax);
309 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
310 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
312 // carbon cone outer region
316 cpar[2] = kZAbsStart* TMath::Tan(kAccMax);
318 cpar[4] = cpar[2]+2. * cpar[0] * TMath::Tan(kAccMax);
320 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
321 dz=-(kZRear-kZAbsStart)/2.+cpar[0];
322 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
328 zr=kZRear-(kDRear-epsi);
329 cpar[0] = (kDRear-epsi)/2.;
330 cpar[1] = zr * TMath::Tan(kAccMin);
331 cpar[2] = zr * TMath::Tan(kThetaR*repsi);
332 cpar[3] = cpar[1] + TMath::Tan(kAccMin) * (kDRear-epsi);
333 cpar[4] = cpar[2] + TMath::Tan(kThetaR*repsi) * (kDRear-epsi);
334 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
335 dz=(kZRear-kZAbsStart)/2.-cpar[0];
336 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
338 // special W medium for last 5 cm of W
341 cpar[1] = zr * TMath::Tan(kAccMin);
342 cpar[2] = zr * TMath::Tan(kThetaR*repsi);
343 cpar[3] = cpar[1] + TMath::Tan(kAccMin) * 5.;
344 cpar[4] = cpar[2] + TMath::Tan(kThetaR*repsi) * 5.;
345 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
346 dz=(kDRear-epsi)/2.-cpar[0];
347 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
350 Float_t drMin=TMath::Tan(kThetaR) * 5;
351 Float_t drMax=TMath::Tan(kAccMax) * 5;
352 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
354 { // Begin local scope for i
355 for (Int_t i=0; i<3; i++) {
356 zr=kZRear-kDRear+5+i*10.;
357 cpar[1] = zr * TMath::Tan(kThetaR);
358 cpar[2] = zr * TMath::Tan(kAccMax);
359 cpar[3] = cpar[1] + drMin;
360 cpar[4] = cpar[2] + drMax;
361 dz=(kZRear-kZAbsStart)/2.-cpar[0]-5.-(2-i)*10;
362 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
364 } // End local scope for i
365 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
366 dz = (kZRear-kZAbsStart)/2.+kZAbsStart;
367 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
372 // pipe and heating jackets
376 tpar0[2]=(kZOpen-kZAbsStart)/2;
378 tpar0[1]=kRVacu+dTube+dInsu+dEnve;
379 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
384 tpar[0]=kRVacu+dTube;
385 tpar[1]=tpar[0]+dInsu;
386 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
387 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
389 dz=-(kZRear-kZAbsStart)/2.+tpar0[2];
390 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
394 cpar0[0]=(kZRear-kDRear-kZOpen)/2;
395 cpar0[1]= kRVacu-0.05;
396 cpar0[2]= kRVacu+dTube+dInsu+dEnve;
397 Float_t dR=2.*cpar0[0]*TMath::Tan(kThetaOpen1);
398 cpar0[3]=cpar0[1]+dR;
399 cpar0[4]=cpar0[2]+dR;
400 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
406 cpar[1]=cpar0[1]+dTube;
407 cpar[2]=cpar0[1]+dTube+dInsu;
408 cpar[3]=cpar0[3]+dTube;
409 cpar[4]=cpar0[3]+dTube+dInsu;
410 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
411 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
413 dz=(kZRear-kZAbsStart)/2.-cpar0[0]-kDRear;
414 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
431 par[10] = kZRear+20.;
440 gMC->Gsvolu("ASSS", "PGON", idtmed[kAl], par, 16);
441 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
444 trap[ 0] = (530.-170.)/2.;
447 trap[ 4] = (600.-(kZRear+2.))/2.;;
454 trap[ 1] = -TMath::ATan((trap[4]-trap[8])/2./trap[0])*180./TMath::Pi();
455 AliMatrix(idrotm[1600], 180., 0., 90., 0., 90., 90.);
456 AliMatrix(idrotm[1601], 180., 0., 90., 0., 90., 270.);
457 gMC->Gsvolu("ASST", "TRAP", idtmed[kSteel], trap, 11);
458 dz = (600.+kZRear+2.)/2.+(trap[4]-trap[8])/2.;
459 // Float_t dy = 170.+trap[0];
461 // gMC->Gspos("ASST", 1, "ALIC", 0., dy, dz, idrotm[1600], "ONLY");
462 // gMC->Gspos("ASST", 2, "ALIC", 0., -dy, dz, idrotm[1601], "ONLY");
465 //_____________________________________________________________________________
467 void AliABSOv0::Init()
470 // Initialisation of the muon absorber after it has been built
474 printf("\n%s: ",ClassName());
475 for(i=0;i<35;i++) printf("*");
476 printf(" ABSOv0_INIT ");
477 for(i=0;i<35;i++) printf("*");
478 printf("\n%s: ",ClassName());
480 for(i=0;i<80;i++) printf("*");