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 **************************************************************************/
20 ///////////////////////////////////////////////////////////////////////////////
23 // This class contains the description of the muon absorber geometry //
27 <img src="picts/AliABSOClass.gif">
30 <font size=+2 color=red>
31 <p>The responsible person for this module is
32 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
39 ///////////////////////////////////////////////////////////////////////////////
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">
85 Int_t *idtmed = fIdtmed->GetArray()-1599;
87 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
89 #include "ShieldConst.h"
90 // Mother volume and outer shielding: Pb
96 par[3] = -(abs_l-abs_d)/2.;
98 par[5] = abs_d * TMath::Tan(theta1);
100 par[6] = par[3]+(z_nose-abs_d);
102 par[8] = z_nose * TMath::Tan(theta1);
104 par[9] = par[3]+(z_cone-abs_d);
106 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(theta2);
108 par[12] = par[3]+(abs_c-abs_d);
110 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(acc_max);
112 par[15] = par[3]+(abs_l-d_rear-abs_d);
113 par[16] = r_abs + (par[15] - par[12]) * TMath::Tan(theta_open1) ;
114 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(acc_max);
116 par[18] = par[3]+(abs_l-d_rear-abs_d);
117 par[19] = (abs_l-d_rear) * TMath::Tan(acc_min);
118 par[20] = par[14] + (par[15] - par[12]) * TMath::Tan(acc_max);
121 par[22] = abs_l* TMath::Tan(acc_min);
122 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(acc_max);
123 gMC->Gsvolu("ABSS", "PCON", idtmed[1612], par, 24);
124 for (Int_t i=4; i<24; i+=3) par[i] = 0;
125 gMC->Gsvolu("ABSM", "PCON", idtmed[1655], par, 24);
126 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
131 par[4] = par[5] -d_steel;
132 par[7] = par[8] -d_steel;
133 par[10]= par[11]-d_steel;
134 par[13]= par[14]-d_steel;
135 par[16]= par[17]-d_steel;
136 par[19]= par[20]-d_steel;
137 par[22]= par[23]-d_steel;
138 gMC->Gsvolu("ABST", "PCON", idtmed[1618], par, 24);
139 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
141 // Polyethylene shield
143 cpar[0] = (abs_l - z_cone) / 2.;
144 cpar[1] = z_cone * TMath::Tan(acc_max);
145 cpar[2] = cpar[1] + d_poly;
146 cpar[3] = abs_l * TMath::Tan(acc_max);
147 cpar[4] = cpar[3] + d_poly;
148 gMC->Gsvolu("APOL", "CONE", idtmed[1657], cpar, 5);
149 dz = (abs_l-abs_d)/2.-cpar[0];
150 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
153 // Tungsten nose to protect TPC
155 cpar[0] = (z_nose - abs_d) / 2.;
156 cpar[1] = abs_d * TMath::Tan(acc_max);
157 cpar[2] = abs_d * TMath::Tan(theta1)-d_steel;
158 cpar[3] = z_nose * TMath::Tan(acc_max);
159 cpar[4] = z_nose * TMath::Tan(theta1)-d_steel;
160 gMC->Gsvolu("ANOS", "CONE", idtmed[1611], cpar, 5);
162 dz = -(abs_l-abs_d)/2.+cpar[0];
163 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
165 // Tungsten inner shield
167 cpar[0] = (abs_l-d_rear - abs_c)/ 2.;
169 cpar[2] = abs_c * TMath::Tan(acc_min);
170 cpar[3] = r_abs + 2. * cpar[0] * TMath::Tan(theta_open1);
171 cpar[4] = (abs_l-d_rear) * TMath::Tan(acc_min);
172 gMC->Gsvolu("AWIN", "CONE", idtmed[1651], cpar, 5);
174 dz = (abs_l-abs_d)/2.-cpar[0]-d_rear;
175 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
177 // Inner tracking region
184 pcpar[3] = -(abs_l-abs_d)/2.;
186 pcpar[5] = abs_d * TMath::Tan(acc_max);
187 pcpar[6] = pcpar[3]+(z_2deg-abs_d);
189 pcpar[8] = z_2deg * TMath::Tan(acc_max);
191 pcpar[10] = abs_l * TMath::Tan(acc_min);
192 pcpar[11] = abs_l * TMath::Tan(acc_max);
193 gMC->Gsvolu("AITR", "PCON", idtmed[1612], pcpar, 12);
195 // special Pb medium for last 5 cm of Pb
198 cpar[1] = zr * TMath::Tan(theta_r);
199 cpar[2] = zr * TMath::Tan(acc_max);
200 cpar[3] = cpar[1] + TMath::Tan(acc_min) * 5;
201 cpar[4] = cpar[2] + TMath::Tan(theta_r) * 5;
202 gMC->Gsvolu("ARPB", "CONE", idtmed[1632], cpar, 5);
203 dz=(abs_l-abs_d)/2.-cpar[0];
204 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
207 // concrete cone: concrete
209 pcpar[9] = par[3]+(abs_l-d_rear-abs_d);
210 pcpar[10] = (abs_l-d_rear) * TMath::Tan(acc_min);
211 pcpar[11] = (abs_l-d_rear) * TMath::Tan(acc_max);
212 gMC->Gsvolu("ACON", "PCON", idtmed[1616], pcpar, 12);
213 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
215 // carbon cone: carbon
217 pcpar[9] = pcpar[3]+(abs_cc-abs_d);
218 pcpar[10] = abs_cc * TMath::Tan(acc_min);
219 pcpar[11] = abs_cc * TMath::Tan(acc_max);
220 gMC->Gsvolu("ACAR", "PCON", idtmed[1605], pcpar, 12);
221 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
226 cpar[1] = zr * TMath::Tan(acc_min);
227 cpar[2] = zr * TMath::Tan(theta_r);
228 cpar[3] = cpar[1] + TMath::Tan(acc_min) * 35;
229 cpar[4] = cpar[2] + TMath::Tan(theta_r) * 35;
230 gMC->Gsvolu("ARW0", "CONE", idtmed[1611], cpar, 5);
231 dz=(abs_l-abs_d)/2.-cpar[0];
232 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
234 // special W medium for last 5 cm of W
237 cpar[1] = zr * TMath::Tan(acc_min);
238 cpar[2] = zr * TMath::Tan(theta_r);
239 cpar[3] = cpar[1] + TMath::Tan(acc_min) * 5.;
240 cpar[4] = cpar[2] + TMath::Tan(theta_r) * 5.;
241 gMC->Gsvolu("ARW1", "CONE", idtmed[1631], cpar, 5);
242 dz=d_rear/2.-cpar[0];
243 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
245 // PolyEthylene Layers
246 Float_t dr_min=TMath::Tan(theta_r) * 5;
247 Float_t dr_max=TMath::Tan(acc_max) * 5;
248 gMC->Gsvolu("ARPE", "CONE", idtmed[1617], cpar, 0);
250 for (Int_t i=0; i<3; i++) {
251 zr=abs_l-d_rear+5+i*10.;
252 cpar[1] = zr * TMath::Tan(theta_r);
253 cpar[2] = zr * TMath::Tan(acc_max);
254 cpar[3] = cpar[1] + dr_min;
255 cpar[4] = cpar[2] + dr_max;
256 dz=(abs_l-abs_d)/2.-cpar[0]-5.-(2-i)*10;
257 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
259 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
260 dz = (abs_l-abs_d)/2.+abs_d;
261 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
266 // pipe and heating jackets
270 tpar0[2]=(abs_c-abs_d)/2;
273 gMC->Gsvolu("AV11", "TUBE", idtmed[1658], tpar0, 3);
277 tpar[0]=tpar0[0]+d_tube;
278 tpar[1]=tpar0[0]+d_tube+d_insu;
279 gMC->Gsvolu("AI11", "TUBE", idtmed[1653], tpar, 3);
280 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
283 tpar[0]=tpar0[1]-d_prot-d_free;
284 tpar[1]=tpar0[1]-d_prot;
285 gMC->Gsvolu("AP11", "TUBE", idtmed[1655], tpar, 3);
286 gMC->Gspos("AP11", 1, "AV11", 0., 0., 0., 0, "ONLY");
288 dz=-(abs_l-abs_d)/2.+tpar0[2];
289 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
293 cpar0[0]=(abs_l-d_rear-abs_c)/2;
296 cpar0[3]=cpar0[1]+2.*cpar0[0]*TMath::Tan(theta_open1);
297 cpar0[4]=cpar0[2]+2.*cpar0[0]*TMath::Tan(theta_open1);
298 gMC->Gsvolu("AV21", "CONE", idtmed[1658], cpar0, 5);
302 cpar[1]=cpar0[1]+d_tube;
303 cpar[2]=cpar0[1]+d_tube+d_insu;
304 cpar[3]=cpar0[3]+d_tube;
305 cpar[4]=cpar0[3]+d_tube+d_insu;
306 gMC->Gsvolu("AI21", "CONE", idtmed[1653], cpar, 5);
307 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
310 cpar[1]=cpar0[2]-d_prot-d_free;
311 cpar[2]=cpar0[2]-d_prot;
312 cpar[3]=cpar0[4]-d_prot-d_free;
313 cpar[4]=cpar0[4]-d_prot;
314 gMC->Gsvolu("AP21", "CONE", idtmed[1655], cpar, 5);
315 gMC->Gspos("AP21", 1, "AV21", 0., 0., 0., 0, "ONLY");
317 dz=(abs_l-abs_d)/2.-cpar0[0]-d_rear;
318 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
322 //_____________________________________________________________________________
324 void AliABSOv0::Init()
327 // Initialisation of the muon absorber after it has been built
331 for(i=0;i<35;i++) printf("*");
332 printf(" ABSOv0_INIT ");
333 for(i=0;i<35;i++) printf("*");
336 for(i=0;i<80;i++) printf("*");