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 Revision 1.1 2000/01/12 15:39:30 morsch
19 Standar version of ABSO
23 ///////////////////////////////////////////////////////////////////////////////
26 // This class contains the description of the muon absorber geometry //
30 <img src="picts/AliABSOClass.gif">
33 <font size=+2 color=red>
34 <p>The responsible person for this module is
35 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
42 ///////////////////////////////////////////////////////////////////////////////
44 #include "AliABSOv0.h"
50 //_____________________________________________________________________________
51 AliABSOv0::AliABSOv0()
54 // Default constructor
58 //_____________________________________________________________________________
59 AliABSOv0::AliABSOv0(const char *name, const char *title)
63 // Standard constructor
70 //_____________________________________________________________________________
71 void AliABSOv0::CreateGeometry()
74 // Creation of the geometry of the muon absorber
78 <img src="picts/AliABSOv0Tree.gif">
83 <img src="picts/AliABSOv0.gif">
88 Int_t *idtmed = fIdtmed->GetArray()-1599;
90 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
92 #include "ShieldConst.h"
93 // Mother volume and outer shielding: Pb
99 par[3] = -(abs_l-abs_d)/2.;
101 par[5] = abs_d * TMath::Tan(theta1);
103 par[6] = par[3]+(z_nose-abs_d);
105 par[8] = z_nose * TMath::Tan(theta1);
107 par[9] = par[3]+(z_cone-abs_d);
109 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(theta2);
111 par[12] = par[3]+(abs_c-abs_d);
113 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(acc_max);
115 par[15] = par[3]+(abs_l-d_rear-abs_d);
116 par[16] = r_abs + (par[15] - par[12]) * TMath::Tan(theta_open1) ;
117 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(acc_max);
119 par[18] = par[3]+(abs_l-d_rear-abs_d);
120 par[19] = (abs_l-d_rear) * TMath::Tan(acc_min);
121 par[20] = par[14] + (par[15] - par[12]) * TMath::Tan(acc_max);
124 par[22] = abs_l* TMath::Tan(acc_min);
125 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(acc_max);
126 gMC->Gsvolu("ABSS", "PCON", idtmed[1612], par, 24);
127 for (Int_t i=4; i<24; i+=3) par[i] = 0;
128 gMC->Gsvolu("ABSM", "PCON", idtmed[1655], par, 24);
129 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
134 par[4] = par[5] -d_steel;
135 par[7] = par[8] -d_steel;
136 par[10]= par[11]-d_steel;
137 par[13]= par[14]-d_steel;
138 par[16]= par[17]-d_steel;
139 par[19]= par[20]-d_steel;
140 par[22]= par[23]-d_steel;
141 gMC->Gsvolu("ABST", "PCON", idtmed[1618], par, 24);
142 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
144 // Polyethylene shield
146 cpar[0] = (abs_l - z_cone) / 2.;
147 cpar[1] = z_cone * TMath::Tan(acc_max);
148 cpar[2] = cpar[1] + d_poly;
149 cpar[3] = abs_l * TMath::Tan(acc_max);
150 cpar[4] = cpar[3] + d_poly;
151 gMC->Gsvolu("APOL", "CONE", idtmed[1657], cpar, 5);
152 dz = (abs_l-abs_d)/2.-cpar[0];
153 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
156 // Tungsten nose to protect TPC
158 cpar[0] = (z_nose - abs_d) / 2.;
159 cpar[1] = abs_d * TMath::Tan(acc_max);
160 cpar[2] = abs_d * TMath::Tan(theta1)-d_steel;
161 cpar[3] = z_nose * TMath::Tan(acc_max);
162 cpar[4] = z_nose * TMath::Tan(theta1)-d_steel;
163 gMC->Gsvolu("ANOS", "CONE", idtmed[1611], cpar, 5);
165 dz = -(abs_l-abs_d)/2.+cpar[0];
166 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
168 // Tungsten inner shield
170 cpar[0] = (abs_l-d_rear - abs_c)/ 2.;
172 cpar[2] = abs_c * TMath::Tan(acc_min);
173 cpar[3] = r_abs + 2. * cpar[0] * TMath::Tan(theta_open1);
174 cpar[4] = (abs_l-d_rear) * TMath::Tan(acc_min);
175 gMC->Gsvolu("AWIN", "CONE", idtmed[1651], cpar, 5);
177 dz = (abs_l-abs_d)/2.-cpar[0]-d_rear;
178 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
180 // Inner tracking region
187 pcpar[3] = -(abs_l-abs_d)/2.;
189 pcpar[5] = abs_d * TMath::Tan(acc_max);
190 pcpar[6] = pcpar[3]+(z_2deg-abs_d);
192 pcpar[8] = z_2deg * TMath::Tan(acc_max);
194 pcpar[10] = abs_l * TMath::Tan(acc_min);
195 pcpar[11] = abs_l * TMath::Tan(acc_max);
196 gMC->Gsvolu("AITR", "PCON", idtmed[1612], pcpar, 12);
198 // special Pb medium for last 5 cm of Pb
201 cpar[1] = zr * TMath::Tan(theta_r);
202 cpar[2] = zr * TMath::Tan(acc_max);
203 cpar[3] = cpar[1] + TMath::Tan(acc_min) * 5;
204 cpar[4] = cpar[2] + TMath::Tan(acc_max) * 5;
205 gMC->Gsvolu("ARPB", "CONE", idtmed[1632], cpar, 5);
206 dz=(abs_l-abs_d)/2.-cpar[0];
207 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
210 // concrete cone: concrete
212 pcpar[9] = par[3]+(abs_l-d_rear-abs_d);
213 pcpar[10] = (abs_l-d_rear) * TMath::Tan(acc_min);
214 pcpar[11] = (abs_l-d_rear) * TMath::Tan(acc_max);
215 gMC->Gsvolu("ACON", "PCON", idtmed[1616], pcpar, 12);
216 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
218 // carbon cone: carbon
220 pcpar[9] = pcpar[3]+(abs_cc-abs_d);
221 pcpar[10] = abs_cc * TMath::Tan(acc_min);
222 pcpar[11] = abs_cc * TMath::Tan(acc_max);
223 gMC->Gsvolu("ACAR", "PCON", idtmed[1605], pcpar, 12);
224 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
229 cpar[1] = zr * TMath::Tan(acc_min);
230 cpar[2] = zr * TMath::Tan(theta_r);
231 cpar[3] = cpar[1] + TMath::Tan(acc_min) * 35;
232 cpar[4] = cpar[2] + TMath::Tan(theta_r) * 35;
233 gMC->Gsvolu("ARW0", "CONE", idtmed[1611], cpar, 5);
234 dz=(abs_l-abs_d)/2.-cpar[0];
235 gMC->Gspos("ARW0", 1, "AITR", 0., 0., dz, 0, "ONLY");
237 // special W medium for last 5 cm of W
240 cpar[1] = zr * TMath::Tan(acc_min);
241 cpar[2] = zr * TMath::Tan(theta_r);
242 cpar[3] = cpar[1] + TMath::Tan(acc_min) * 5.;
243 cpar[4] = cpar[2] + TMath::Tan(theta_r) * 5.;
244 gMC->Gsvolu("ARW1", "CONE", idtmed[1631], cpar, 5);
245 dz=d_rear/2.-cpar[0];
246 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
248 // PolyEthylene Layers
249 Float_t dr_min=TMath::Tan(theta_r) * 5;
250 Float_t dr_max=TMath::Tan(acc_max) * 5;
251 gMC->Gsvolu("ARPE", "CONE", idtmed[1617], cpar, 0);
253 for (Int_t i=0; i<3; i++) {
254 zr=abs_l-d_rear+5+i*10.;
255 cpar[1] = zr * TMath::Tan(theta_r);
256 cpar[2] = zr * TMath::Tan(acc_max);
257 cpar[3] = cpar[1] + dr_min;
258 cpar[4] = cpar[2] + dr_max;
259 dz=(abs_l-abs_d)/2.-cpar[0]-5.-(2-i)*10;
260 gMC->Gsposp("ARPE", i+1, "AITR", 0., 0., dz, 0, "ONLY",cpar,5);
262 gMC->Gspos("AITR", 1, "ABSS", 0., 0., 0., 0, "ONLY");
263 dz = (abs_l-abs_d)/2.+abs_d;
264 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
269 // pipe and heating jackets
273 tpar0[2]=(abs_c-abs_d)/2;
276 gMC->Gsvolu("AV11", "TUBE", idtmed[1658], tpar0, 3);
280 tpar[0]=tpar0[0]+d_tube;
281 tpar[1]=tpar0[0]+d_tube+d_insu;
282 gMC->Gsvolu("AI11", "TUBE", idtmed[1653], tpar, 3);
283 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
286 tpar[0]=tpar0[1]-d_prot-d_free;
287 tpar[1]=tpar0[1]-d_prot;
288 gMC->Gsvolu("AP11", "TUBE", idtmed[1655], tpar, 3);
289 gMC->Gspos("AP11", 1, "AV11", 0., 0., 0., 0, "ONLY");
291 dz=-(abs_l-abs_d)/2.+tpar0[2];
292 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
296 cpar0[0]=(abs_l-d_rear-abs_c)/2;
299 cpar0[3]=cpar0[1]+2.*cpar0[0]*TMath::Tan(theta_open1);
300 cpar0[4]=cpar0[2]+2.*cpar0[0]*TMath::Tan(theta_open1);
301 gMC->Gsvolu("AV21", "CONE", idtmed[1658], cpar0, 5);
305 cpar[1]=cpar0[1]+d_tube;
306 cpar[2]=cpar0[1]+d_tube+d_insu;
307 cpar[3]=cpar0[3]+d_tube;
308 cpar[4]=cpar0[3]+d_tube+d_insu;
309 gMC->Gsvolu("AI21", "CONE", idtmed[1653], cpar, 5);
310 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
313 cpar[1]=cpar0[2]-d_prot-d_free;
314 cpar[2]=cpar0[2]-d_prot;
315 cpar[3]=cpar0[4]-d_prot-d_free;
316 cpar[4]=cpar0[4]-d_prot;
317 gMC->Gsvolu("AP21", "CONE", idtmed[1655], cpar, 5);
318 gMC->Gspos("AP21", 1, "AV21", 0., 0., 0., 0, "ONLY");
320 dz=(abs_l-abs_d)/2.-cpar0[0]-d_rear;
321 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
325 //_____________________________________________________________________________
327 void AliABSOv0::Init()
330 // Initialisation of the muon absorber after it has been built
334 for(i=0;i<35;i++) printf("*");
335 printf(" ABSOv0_INIT ");
336 for(i=0;i<35;i++) printf("*");
339 for(i=0;i<80;i++) printf("*");