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 "AliABSOv0.h"
45 //_____________________________________________________________________________
46 AliABSOv0::AliABSOv0()
49 // Default constructor
53 //_____________________________________________________________________________
54 AliABSOv0::AliABSOv0(const char *name, const char *title)
58 // Standard constructor
65 //_____________________________________________________________________________
66 void AliABSOv0::CreateGeometry()
69 // Creation of the geometry of the muon absorber
73 <img src="picts/AliABSOv0Tree.gif">
78 <img src="picts/AliABSOv0.gif">
85 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
86 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
87 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
89 Int_t *idtmed = fIdtmed->GetArray()-1599;
91 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
94 #include "ABSOSHILConst.h"
95 #include "ABSOConst.h"
97 // Structure of Tracking Region
103 fMLayers[0][0] = kAir; fZLayers[0][0] = kZAbsStart;
104 fMLayers[0][1] = kC; fZLayers[0][1] = kZAbsCc;
105 fMLayers[0][2] = kConcrete; fZLayers[0][2] = kZRear-kDRear-dzFe;
106 fMLayers[0][3] = kSteel; fZLayers[0][3] = kZRear-kDRear;
107 fMLayers[0][4] = kSteel; fZLayers[0][4] = kZRear;
111 fMLayers[1][0] = kAir ; fZLayers[1][0] = fZLayers[0][0]-10.;
112 fMLayers[1][1] = kAl ; fZLayers[1][1] = fZLayers[0][0];
113 fMLayers[1][2] = fMLayers[0][1]; fZLayers[1][2] = fZLayers[0][1];
114 fMLayers[1][3] = fMLayers[0][2]; fZLayers[1][3] = fZLayers[0][2];
115 fMLayers[1][4] = fMLayers[0][3]; fZLayers[1][4] = fZLayers[0][3];
116 fMLayers[1][5] = kNiCuW; fZLayers[1][5] = fZLayers[0][4];
119 Float_t dTube=0.1; // tube thickness
120 Float_t dInsu=0.5; // insulation thickness
121 Float_t dEnve=0.1; // protective envelope thickness
122 // Float_t dFree=0.5; // clearance thickness
125 // Mother volume and outer shielding: Pb
130 par[3] = -(kZRear-kZAbsStart)/2.;
132 par[5] = kZAbsStart * TMath::Tan(kTheta1);
134 par[6] = par[3]+(kZNose-kZAbsStart);
136 par[8] = kZNose * TMath::Tan(kTheta1);
138 par[9] = par[3]+(kZConeTPC-kZAbsStart);
140 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(kTheta2);
142 par[12] = par[3]+(kZOpen-kZAbsStart);
144 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(kAccMax);
146 par[15] = par[3]+(kZRear-kDRear-kZAbsStart);
147 par[16] = kRAbs + (par[15] - par[12]) * TMath::Tan(kThetaOpen1) ;
148 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(kAccMax);
150 par[18] = par[3]+(kZRear-kDRear-kZAbsStart);
151 par[19] = (kZRear-kDRear) * TMath::Tan(kAccMin);
152 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(kAccMax);
155 par[22] = kZRear* TMath::Tan(kAccMin);
156 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(kAccMax);
157 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
158 { // Begin local scope for i
159 for (Int_t i=4; i<18; i+=3) par[i] = 0;
160 } // End local scope for i
161 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
162 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
167 par[4] = par[5] -kDSteel;
168 par[7] = par[8] -kDSteel;
169 par[10]= par[11]-kDSteel;
170 par[13]= par[14]-kDSteel;
171 par[16]= par[17]-kDSteel;
172 par[19]= par[20]-kDSteel;
173 par[22]= par[23]-kDSteel;
174 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
175 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
177 // Polyethylene shield
179 cpar[0] = (kZRear - kZConeTPC) / 2.;
180 cpar[1] = kZConeTPC * TMath::Tan(kAccMax);
181 cpar[2] = cpar[1] + kDPoly;
182 cpar[3] = kZRear * TMath::Tan(kAccMax);
183 cpar[4] = cpar[3] + kDPoly;
184 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
185 dz = (kZRear-kZAbsStart)/2.-cpar[0];
186 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
189 // Tungsten nose to protect TPC
191 cpar[0] = (kZNose - kZAbsStart) / 2.;
192 cpar[1] = kZAbsStart * TMath::Tan(kAccMax);
193 cpar[2] = kZAbsStart * TMath::Tan(kTheta1)-kDSteel;
194 cpar[3] = kZNose * TMath::Tan(kAccMax);
195 cpar[4] = kZNose * TMath::Tan(kTheta1)-kDSteel;
196 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
198 dz = -(kZRear-kZAbsStart)/2.+cpar[0];
199 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
201 // Tungsten inner shield
203 Float_t zW = kZTwoDeg+.1;
204 Float_t dZ = zW+(kZRear-kDRear-zW)/2.;
211 pcpar[5] = zW * TMath::Tan(kAccMin);
212 pcpar[6] = kZOpen-dZ;
214 pcpar[8] = kZOpen * TMath::Tan(kAccMin);
215 pcpar[9] = kZRear-kDRear-dZ;
216 pcpar[10] = kRAbs+(kZRear-kDRear-kZOpen) * TMath::Tan(kThetaOpen1);
217 pcpar[11] = (kZRear-kDRear) * TMath::Tan(kAccMin);
219 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
220 dz=(zW+kZRear-kDRear)/2-(kZAbsStart+kZRear)/2.;
221 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
223 // First part replaced by Carbon
225 cpar[0] = (200.-zW)/2.;
229 cpar[4] = 200. * TMath::Tan(kAccMin);
230 gMC->Gsvolu("ACNO", "CONE", idtmed[kC], cpar, 5);
232 gMC->Gspos("ACNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
236 cpar[0] = (kZRear-kDRear-zWW)/2.;
237 cpar[1] = kRAbs + (zWW-kZOpen) * TMath::Tan(kThetaOpen1);
238 cpar[2] = zWW * TMath::Tan(kAccMin);
241 gMC->Gsvolu("AWNO", "CONE", idtmed[kCu+40], cpar, 5);
244 gMC->Gspos("AWNO", 1, "AWIN", 0., 0., dz, 0, "ONLY");
247 // Inner tracking region
255 pcpar[3] = -(kZRear-kZAbsStart)/2.;
257 pcpar[5] = kZAbsStart * TMath::Tan(kAccMax);
258 pcpar[6] = pcpar[3]+(kZTwoDeg-kZAbsStart);
260 pcpar[8] = kZTwoDeg * TMath::Tan(kAccMax);
261 pcpar[9] = -pcpar[3];
262 pcpar[10] = kZRear * TMath::Tan(kAccMin);
263 pcpar[11] = kZRear * TMath::Tan(kAccMax);
264 gMC->Gsvolu("AITR", "PCON", idtmed[fMLayers[0][4]], pcpar, 12);
266 // special Pb medium for last 5 cm of Pb
267 Float_t zr=kZRear-2.-0.001;
269 cpar[1] = zr * TMath::Tan(kThetaR);
270 cpar[2] = zr * TMath::Tan(kAccMax);
271 cpar[3] = cpar[1] + TMath::Tan(kThetaR) * 2;
272 cpar[4] = cpar[2] + TMath::Tan(kAccMax) * 2;
273 gMC->Gsvolu("ARPB", "CONE", idtmed[fMLayers[0][4]], cpar, 5);
274 dz=(kZRear-kZAbsStart)/2.-cpar[0]-0.001;
275 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
277 // concrete cone: concrete
279 pcpar[9] = pcpar[3]+(kZRear-kDRear-kZAbsStart);
280 pcpar[10] = (kZRear-kDRear) * TMath::Tan(kAccMin);
281 pcpar[11] = (kZRear-kDRear) * TMath::Tan(kAccMax);
282 gMC->Gsvolu("ACON", "PCON", idtmed[fMLayers[0][2]+40], pcpar, 12);
283 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
287 zr = kZRear-kDRear-dzFe;
289 cpar[1] = zr * TMath::Tan(kAccMin);
290 cpar[2] = zr * TMath::Tan(kAccMax);
291 cpar[3] = cpar[1] + TMath::Tan(kAccMin) * dzFe;
292 cpar[4] = cpar[2] + TMath::Tan(kAccMax) * dzFe;
293 gMC->Gsvolu("ACFE", "CONE",idtmed[fMLayers[0][3]], cpar, 5);
295 dz = (kZRear-kZAbsStart)/2.-kDRear-dzFe/2.;
297 gMC->Gspos("ACFE", 1, "ACON", 0., 0., dz, 0, "ONLY");
302 // carbon cone: carbon
304 pcpar[9] = pcpar[3]+(kZAbsCc-kZAbsStart);
305 pcpar[10] = kZAbsCc * TMath::Tan(kAccMin);
306 pcpar[11] = kZAbsCc * TMath::Tan(kAccMax);
307 gMC->Gsvolu("ACAR", "PCON", idtmed[fMLayers[0][1]+40], pcpar, 12);
308 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
310 // carbon cone outer region
314 cpar[2] = kZAbsStart* TMath::Tan(kAccMax);
316 cpar[4] = cpar[2]+2. * cpar[0] * TMath::Tan(kAccMax);
318 gMC->Gsvolu("ACAO", "CONE", idtmed[fMLayers[0][1]], cpar, 5);
319 dz=-(kZRear-kZAbsStart)/2.+cpar[0];
320 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
326 zr=kZRear-(kDRear-epsi);
327 cpar[0] = (kDRear-epsi)/2.;
328 cpar[1] = zr * TMath::Tan(kAccMin);
329 cpar[2] = zr * TMath::Tan(kThetaR*repsi);
330 cpar[3] = cpar[1] + TMath::Tan(kAccMin) * (kDRear-epsi);
331 cpar[4] = cpar[2] + TMath::Tan(kThetaR*repsi) * (kDRear-epsi);
332 gMC->Gsvolu("ARW0", "CONE", idtmed[fMLayers[1][4]+40], cpar, 5);
333 dz=(kZRear-kZAbsStart)/2.-cpar[0];
334 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
336 // special W medium for last 5 cm of W
339 cpar[1] = zr * TMath::Tan(kAccMin);
340 cpar[2] = zr * TMath::Tan(kThetaR*repsi);
341 cpar[3] = cpar[1] + TMath::Tan(kAccMin) * 5.;
342 cpar[4] = cpar[2] + TMath::Tan(kThetaR*repsi) * 5.;
343 gMC->Gsvolu("ARW1", "CONE", idtmed[fMLayers[1][4]+20], cpar, 5);
344 dz=(kDRear-epsi)/2.-cpar[0];
345 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
348 Float_t drMin=TMath::Tan(kThetaR) * 5;
349 Float_t drMax=TMath::Tan(kAccMax) * 5;
350 gMC->Gsvolu("ARPE", "CONE", idtmed[fMLayers[0][4]], cpar, 0);
352 { // Begin local scope for i
353 for (Int_t i=0; i<3; i++) {
354 zr=kZRear-kDRear+5+i*10.;
355 cpar[1] = zr * TMath::Tan(kThetaR);
356 cpar[2] = zr * TMath::Tan(kAccMax);
357 cpar[3] = cpar[1] + drMin;
358 cpar[4] = cpar[2] + drMax;
359 dz=(kZRear-kZAbsStart)/2.-cpar[0]-5.-(2-i)*10;
360 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
362 } // End local scope for i
363 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
364 dz = (kZRear-kZAbsStart)/2.+kZAbsStart;
365 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
370 // pipe and heating jackets
374 tpar0[2]=(kZOpen-kZAbsStart)/2;
376 tpar0[1]=kRVacu+dTube+dInsu+dEnve;
377 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
382 tpar[0]=kRVacu+dTube;
383 tpar[1]=tpar[0]+dInsu;
384 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
385 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
387 dz=-(kZRear-kZAbsStart)/2.+tpar0[2];
388 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
392 cpar0[0]=(kZRear-kDRear-kZOpen)/2;
393 cpar0[1]= kRVacu-0.05;
394 cpar0[2]= kRVacu+dTube+dInsu+dEnve;
395 Float_t dR=2.*cpar0[0]*TMath::Tan(kThetaOpen1);
396 cpar0[3]=cpar0[1]+dR;
397 cpar0[4]=cpar0[2]+dR;
398 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
404 cpar[1]=cpar0[1]+dTube;
405 cpar[2]=cpar0[1]+dTube+dInsu;
406 cpar[3]=cpar0[3]+dTube;
407 cpar[4]=cpar0[3]+dTube+dInsu;
408 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
409 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
411 dz=(kZRear-kZAbsStart)/2.-cpar0[0]-kDRear;
412 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
429 par[10] = kZRear+20.;
438 gMC->Gsvolu("ASSS", "PGON", idtmed[kAl], par, 16);
439 gMC->Gspos("ASSS", 1, "ALIC", 0., 0., 0., 0, "ONLY");
442 trap[ 0] = (530.-170.)/2.;
445 trap[ 4] = (600.-(kZRear+2.))/2.;;
452 trap[ 1] = -TMath::ATan((trap[4]-trap[8])/2./trap[0])*180./TMath::Pi();
453 AliMatrix(idrotm[1600], 180., 0., 90., 0., 90., 90.);
454 AliMatrix(idrotm[1601], 180., 0., 90., 0., 90., 270.);
455 gMC->Gsvolu("ASST", "TRAP", idtmed[kSteel], trap, 11);
456 dz = (600.+kZRear+2.)/2.+(trap[4]-trap[8])/2.;
457 // Float_t dy = 170.+trap[0];
459 // gMC->Gspos("ASST", 1, "ALIC", 0., dy, dz, idrotm[1600], "ONLY");
460 // gMC->Gspos("ASST", 2, "ALIC", 0., -dy, dz, idrotm[1601], "ONLY");
463 //_____________________________________________________________________________
465 void AliABSOv0::Init()
468 // Initialisation of the muon absorber after it has been built
472 printf("\n%s: ",ClassName());
473 for(i=0;i<35;i++) printf("*");
474 printf(" ABSOv0_INIT ");
475 for(i=0;i<35;i++) printf("*");
476 printf("\n%s: ",ClassName());
478 for(i=0;i<80;i++) printf("*");