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 **************************************************************************/
22 ///////////////////////////////////////////////////////////////////////////////
24 #include "AliABSOvF.h"
31 //_____________________________________________________________________________
32 AliABSOvF::AliABSOvF()
35 // Default constructor
39 //_____________________________________________________________________________
40 AliABSOvF::AliABSOvF(const char *name, const char *title)
44 // Standard constructor
51 //_____________________________________________________________________________
52 void AliABSOvF::CreateGeometry()
54 // Create the absorber geometry
55 // The inner part of the absorber (shield) is written also in ALIFE format
57 enum {kC=1605, kAl=1608, kFe=1609, kCu=1610, kW=1611, kPb=1612,
58 kNiCuW=1620, kVacuum=1615, kAir=1614, kConcrete=1616,
59 kPolyCH2=1617, kSteel=1609, kInsulation=1613, kPolyCc=1619};
61 Int_t *idtmed = fIdtmed->GetArray()-1599;
63 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
66 AliALIFE* flukaGeom = new AliALIFE("frontshield.alife", "abso_vol.inp");
68 #include "ABSOSHILConst.h"
69 #include "ABSOConst.h"
70 Float_t dTube=0.1; // tube thickness
71 Float_t dInsu=0.5; // insulation thickness
72 Float_t dEnve=0.1; // protective envelope thickness
73 Float_t dFree=0.5; // clearance thickness
76 // Mother volume and outer shielding: Pb
81 par[3] = -(zRear-zAbsStart)/2.;
83 par[5] = zAbsStart * TMath::Tan(theta1);
85 par[6] = par[3]+(zNose-zAbsStart);
87 par[8] = zNose * TMath::Tan(theta1);
89 par[9] = par[3]+(zConeTPC-zAbsStart);
91 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(theta2);
93 par[12] = par[3]+(zOpen-zAbsStart);
95 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(accMax);
97 par[15] = par[3]+(zRear-dRear-zAbsStart);
98 par[16] = rAbs + (par[15] - par[12]) * TMath::Tan(thetaOpen1) ;
99 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(accMax);
101 par[18] = par[3]+(zRear-dRear-zAbsStart);
102 par[19] = (zRear-dRear) * TMath::Tan(accMin);
103 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(accMax);
106 par[22] = zRear* TMath::Tan(accMin);
107 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(accMax);
108 gMC->Gsvolu("ABSS", "PCON", idtmed[kPb], par, 24);
109 { // Begin local scope for i
110 for (Int_t i=4; i<18; i+=3) par[i] = 0;
111 } // End local scope for i
112 gMC->Gsvolu("ABSM", "PCON", idtmed[kVacuum+40], par, 24);
113 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
118 par[4] = par[5] -dSteel;
119 par[7] = par[8] -dSteel;
120 par[10]= par[11]-dSteel;
121 par[13]= par[14]-dSteel;
122 par[16]= par[17]-dSteel;
123 par[19]= par[20]-dSteel;
124 par[22]= par[23]-dSteel;
125 gMC->Gsvolu("ABST", "PCON", idtmed[kSteel], par, 24);
126 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
128 // Polyethylene shield
130 cpar[0] = (zRear - zConeTPC) / 2.;
131 cpar[1] = zConeTPC * TMath::Tan(accMax);
132 cpar[2] = cpar[1] + dPoly;
133 cpar[3] = zRear * TMath::Tan(accMax);
134 cpar[4] = cpar[3] + dPoly;
135 gMC->Gsvolu("APOL", "CONE", idtmed[kPolyCH2+40], cpar, 5);
136 dz = (zRear-zAbsStart)/2.-cpar[0];
137 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
140 // Tungsten nose to protect TPC
142 cpar[0] = (zNose - zAbsStart) / 2.;
143 cpar[1] = zAbsStart * TMath::Tan(accMax);
144 cpar[2] = zAbsStart * TMath::Tan(theta1)-dSteel;
145 cpar[3] = zNose * TMath::Tan(accMax);
146 cpar[4] = zNose * TMath::Tan(theta1)-dSteel;
147 gMC->Gsvolu("ANOS", "CONE", idtmed[kW], cpar, 5);
149 dz = -(zRear-zAbsStart)/2.+cpar[0];
150 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
152 // Tungsten inner shield
154 Float_t zW=zTwoDeg+.1;
155 Float_t dZ = zW+(zRear-dRear-zW)/2.;
162 pcpar[5] = zW * TMath::Tan(accMin);
165 pcpar[8] = zOpen * TMath::Tan(accMin);
166 pcpar[9] = zRear-dRear-dZ;
167 pcpar[10] = rAbs+(zRear-dRear-zOpen) * TMath::Tan(thetaOpen1);
168 pcpar[11] = (zRear-dRear) * TMath::Tan(accMin);
170 gMC->Gsvolu("AWIN", "PCON", idtmed[kNiCuW+40], pcpar, 12);
172 dz=(zW+zRear-dRear)/2-(zAbsStart+zRear)/2.;
173 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
175 // Inner tracking region
182 pcpar[3] = -(zRear-zAbsStart)/2.;
184 pcpar[5] = zAbsStart * TMath::Tan(accMax);
185 pcpar[6] = pcpar[3]+(zTwoDeg-zAbsStart);
187 pcpar[8] = zTwoDeg * TMath::Tan(accMax);
188 pcpar[9] = -pcpar[3];
189 pcpar[10] = zRear * TMath::Tan(accMin);
190 pcpar[11] = zRear * TMath::Tan(accMax);
191 gMC->Gsvolu("AITR", "PCON", idtmed[kPb], pcpar, 12);
193 // special Pb medium for last 5 cm of Pb
194 Float_t zr=zRear-2.-0.001;
196 cpar[1] = zr * TMath::Tan(thetaR);
197 cpar[2] = zr * TMath::Tan(accMax);
198 cpar[3] = cpar[1] + TMath::Tan(thetaR) * 2;
199 cpar[4] = cpar[2] + TMath::Tan(accMax) * 2;
200 gMC->Gsvolu("ARPB", "CONE", idtmed[kPb], cpar, 5);
201 dz=(zRear-zAbsStart)/2.-cpar[0]-0.001;
202 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
204 // concrete cone: concrete
206 pcpar[9] = pcpar[3]+(zRear-dRear-zAbsStart);
207 pcpar[10] = (zRear-dRear) * TMath::Tan(accMin);
208 pcpar[11] = (zRear-dRear) * TMath::Tan(accMax);
209 gMC->Gsvolu("ACON", "PCON", idtmed[kConcrete+40], pcpar, 12);
210 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
212 // carbon cone: carbon
214 pcpar[9] = pcpar[3]+(zAbsCc-zAbsStart);
215 pcpar[10] = zAbsCc * TMath::Tan(accMin);
216 pcpar[11] = zAbsCc * TMath::Tan(accMax);
217 gMC->Gsvolu("ACAR", "PCON", idtmed[kC+40], pcpar, 12);
218 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
220 // carbon cone outer region
224 cpar[2] = zAbsStart* TMath::Tan(accMax);
226 cpar[4] = cpar[2]+2. * cpar[0] * TMath::Tan(accMax);
228 gMC->Gsvolu("ACAO", "CONE", idtmed[kC], cpar, 5);
229 dz=-(zRear-zAbsStart)/2.+cpar[0];
230 gMC->Gspos("ACAO", 1, "ACAR", 0., 0., dz, 0, "ONLY");
236 zr=zRear-(dRear-epsi);
237 cpar[0] = (dRear-epsi)/2.;
238 cpar[1] = zr * TMath::Tan(accMin);
239 cpar[2] = zr * TMath::Tan(thetaR*repsi);
240 cpar[3] = cpar[1] + TMath::Tan(accMin) * (dRear-epsi);
241 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * (dRear-epsi);
242 gMC->Gsvolu("ARW0", "CONE", idtmed[kNiCuW+40], cpar, 5);
243 dz=(zRear-zAbsStart)/2.-cpar[0];
244 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
246 // special W medium for last 5 cm of W
249 cpar[1] = zr * TMath::Tan(accMin);
250 cpar[2] = zr * TMath::Tan(thetaR*repsi);
251 cpar[3] = cpar[1] + TMath::Tan(accMin) * 5.;
252 cpar[4] = cpar[2] + TMath::Tan(thetaR*repsi) * 5.;
253 gMC->Gsvolu("ARW1", "CONE", idtmed[kNiCuW+20], cpar, 5);
254 dz=(dRear-epsi)/2.-cpar[0];
255 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
257 // PolyEthylene Layers
258 Float_t drMin=TMath::Tan(thetaR) * 5;
259 Float_t drMax=TMath::Tan(accMax) * 5;
260 gMC->Gsvolu("ARPE", "CONE", idtmed[kPolyCH2], cpar, 0);
262 { // Begin local scope for i
263 for (Int_t i=0; i<3; i++) {
264 zr=zRear-dRear+5+i*10.;
265 cpar[1] = zr * TMath::Tan(thetaR);
266 cpar[2] = zr * TMath::Tan(accMax);
267 cpar[3] = cpar[1] + drMin;
268 cpar[4] = cpar[2] + drMax;
269 dz=(zRear-zAbsStart)/2.-cpar[0]-5.-(2-i)*10;
270 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
272 } // End local scope for i
273 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
274 dz = (zRear-zAbsStart)/2.+zAbsStart;
275 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
280 // pipe and heating jackets
284 tpar0[2]=(zOpen-zAbsStart)/2;
287 gMC->Gsvolu("AV11", "TUBE", idtmed[kSteel+40], tpar0, 3);
293 tpar[1]=tpar[0]+dInsu;
294 gMC->Gsvolu("AI11", "TUBE", idtmed[kInsulation+40], tpar, 3);
295 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
298 tpar[0]=tpar[1]+dEnve;
299 tpar[1]=tpar[0]+dFree;
300 gMC->Gsvolu("AP11", "TUBE", idtmed[kAir+40], tpar, 3);
301 gMC->Gspos("AP11", 1, "AV11", 0., 0., 0., 0, "ONLY");
303 dz=-(zRear-zAbsStart)/2.+tpar0[2];
304 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
308 // Float_t zTwoDeg1=zTwoDeg-0.9/TMath::Tan(accMin);
309 Float_t pos[3]={0.,0.,0.};
319 = {"VACUUM", "STEEL", "PIPEINSU", "STEEL", "AIR", "AIR"};
321 = {"MF", "MF", "MF", "MF", "MF", "MF"};
323 = {"$SHH", "$SHH", "$SHH", "$SHH", "$SHH", "$SHH"};
325 = {"VACUUM", "STEEL", "PIPEINSU", "STEEL", "AIR", "CARBON"};
327 = {"MF", "MF", "MF", "MF", "MF", "MF"};
329 = {"$SHH", "$SHH", "$SHH", "$SHH", "$SHH", "$SHS"};
331 flukaGeom->Comment("Front Absorber Cylyndrical Section");
332 flukaGeom->SetDefaultVolume("*ACR02","*ACR02" );
333 flukaGeom->OnionCylinder(r, 6 , zAbsStart, zOpen, pos, materialsB, fieldsB, cutsB);
334 flukaGeom->Cone(rAbs, rAbs, -rAbs, -rAbs, zTwoDeg, zOpen, pos,
335 "NIW", "MF", "$SHH");
342 cpar0[0]=(zRear-dRear-zOpen)/2;
345 Float_t dR=2.*cpar0[0]*TMath::Tan(thetaOpen1);
346 cpar0[3]=cpar0[1]+dR;
347 cpar0[4]=cpar0[2]+dR;
348 gMC->Gsvolu("AV21", "CONE", idtmed[kSteel+40], cpar0, 5);
354 cpar[1]=cpar0[1]+dTube;
355 cpar[2]=cpar0[1]+dTube+dInsu;
356 cpar[3]=cpar0[3]+dTube;
357 cpar[4]=cpar0[3]+dTube+dInsu;
358 gMC->Gsvolu("AI21", "CONE", idtmed[kInsulation+40], cpar, 5);
359 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
362 cpar[1]=cpar0[1]+dTube+dInsu+dEnve;
364 cpar[3]=cpar0[1]+dTube+dInsu+dEnve+dR;
367 gMC->Gsvolu("AP21", "CONE", idtmed[kAir+40], cpar, 5);
368 gMC->Gspos("AP21", 1, "AV21", 0., 0., 0., 0, "ONLY");
370 dz=(zRear-zAbsStart)/2.-cpar0[0]-dRear;
371 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
375 Float_t r1[7], r2[7];
393 flukaGeom->Comment("Front Absorber Conical Section");
394 flukaGeom->OnionCone(r1, r2, 7 , zOpen, zRear-dRear, pos, materialsA, fieldsA, cutsA);
395 flukaGeom->Cone(r1[6], r2[6], -1., -1.,
396 zOpen, zRear-dRear, pos, "NIW", "MF", "$SHH");
405 //_____________________________________________________________________________
407 void AliABSOvF::Init()
410 // Initialisation of the muon absorber after it has been built
414 for(i=0;i<35;i++) printf("*");
415 printf(" ABSOvF_INIT ");
416 for(i=0;i<35;i++) printf("*");
419 for(i=0;i<80;i++) printf("*");