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 1.3 2000/01/18 17:49:56 morsch
19 Serious overlap of ABSM with shield corrected
20 Small error in ARPB parameters corrected
22 Revision 1.2 2000/01/13 11:23:59 morsch
23 Last layer of Pb outer angle corrected
25 Revision 1.1 2000/01/12 15:39:30 morsch
26 Standar version of ABSO
30 ///////////////////////////////////////////////////////////////////////////////
33 // This class contains the description of the muon absorber geometry //
37 <img src="picts/AliABSOClass.gif">
40 <font size=+2 color=red>
41 <p>The responsible person for this module is
42 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
49 ///////////////////////////////////////////////////////////////////////////////
51 #include "AliABSOv0.h"
57 //_____________________________________________________________________________
58 AliABSOv0::AliABSOv0()
61 // Default constructor
65 //_____________________________________________________________________________
66 AliABSOv0::AliABSOv0(const char *name, const char *title)
70 // Standard constructor
77 //_____________________________________________________________________________
78 void AliABSOv0::CreateGeometry()
81 // Creation of the geometry of the muon absorber
85 <img src="picts/AliABSOv0Tree.gif">
90 <img src="picts/AliABSOv0.gif">
95 Int_t *idtmed = fIdtmed->GetArray()-1599;
97 Float_t par[24], cpar[5], cpar0[5], pcpar[12], tpar[3], tpar0[3];
99 #include "ShieldConst.h"
100 // Mother volume and outer shielding: Pb
106 par[3] = -(abs_l-abs_d)/2.;
108 par[5] = abs_d * TMath::Tan(theta1);
110 par[6] = par[3]+(z_nose-abs_d);
112 par[8] = z_nose * TMath::Tan(theta1);
114 par[9] = par[3]+(z_cone-abs_d);
116 par[11] = par[8] + (par[9] - par[6]) * TMath::Tan(theta2);
118 par[12] = par[3]+(abs_c-abs_d);
120 par[14] = par[11] + (par[12] - par[9]) * TMath::Tan(acc_max);
122 par[15] = par[3]+(abs_l-d_rear-abs_d);
123 par[16] = r_abs + (par[15] - par[12]) * TMath::Tan(theta_open1) ;
124 par[17] = par[14] + (par[15] - par[12]) * TMath::Tan(acc_max);
126 par[18] = par[3]+(abs_l-d_rear-abs_d);
127 par[19] = (abs_l-d_rear) * TMath::Tan(acc_min);
128 par[20] = par[14] + (par[18] - par[12]) * TMath::Tan(acc_max);
131 par[22] = abs_l* TMath::Tan(acc_min);
132 par[23] = par[20] + (par[21] - par[18]) * TMath::Tan(acc_max);
133 gMC->Gsvolu("ABSS", "PCON", idtmed[1612], par, 24);
134 { // Begin local scope for i
135 for (Int_t i=4; i<18; i+=3) par[i] = 0;
136 } // End local scope for i
137 gMC->Gsvolu("ABSM", "PCON", idtmed[1655], par, 24);
138 gMC->Gspos("ABSS", 1, "ABSM", 0., 0., 0., 0, "ONLY");
143 par[4] = par[5] -d_steel;
144 par[7] = par[8] -d_steel;
145 par[10]= par[11]-d_steel;
146 par[13]= par[14]-d_steel;
147 par[16]= par[17]-d_steel;
148 par[19]= par[20]-d_steel;
149 par[22]= par[23]-d_steel;
150 gMC->Gsvolu("ABST", "PCON", idtmed[1618], par, 24);
151 gMC->Gspos("ABST", 1, "ABSS", 0., 0., 0., 0, "ONLY");
153 // Polyethylene shield
155 cpar[0] = (abs_l - z_cone) / 2.;
156 cpar[1] = z_cone * TMath::Tan(acc_max);
157 cpar[2] = cpar[1] + d_poly;
158 cpar[3] = abs_l * TMath::Tan(acc_max);
159 cpar[4] = cpar[3] + d_poly;
160 gMC->Gsvolu("APOL", "CONE", idtmed[1657], cpar, 5);
161 dz = (abs_l-abs_d)/2.-cpar[0];
162 gMC->Gspos("APOL", 1, "ABSS", 0., 0., dz, 0, "ONLY");
165 // Tungsten nose to protect TPC
167 cpar[0] = (z_nose - abs_d) / 2.;
168 cpar[1] = abs_d * TMath::Tan(acc_max);
169 cpar[2] = abs_d * TMath::Tan(theta1)-d_steel;
170 cpar[3] = z_nose * TMath::Tan(acc_max);
171 cpar[4] = z_nose * TMath::Tan(theta1)-d_steel;
172 gMC->Gsvolu("ANOS", "CONE", idtmed[1611], cpar, 5);
174 dz = -(abs_l-abs_d)/2.+cpar[0];
175 gMC->Gspos("ANOS", 1, "ABSS", 0., 0., dz, 0, "ONLY");
177 // Tungsten inner shield
179 cpar[0] = (abs_l-d_rear - abs_c)/ 2.;
181 cpar[2] = abs_c * TMath::Tan(acc_min);
182 cpar[3] = r_abs + 2. * cpar[0] * TMath::Tan(theta_open1);
183 cpar[4] = (abs_l-d_rear) * TMath::Tan(acc_min);
184 gMC->Gsvolu("AWIN", "CONE", idtmed[1651], cpar, 5);
186 dz = (abs_l-abs_d)/2.-cpar[0]-d_rear;
187 gMC->Gspos("AWIN", 1, "ABSS", 0., 0., dz, 0, "ONLY");
189 // Inner tracking region
196 pcpar[3] = -(abs_l-abs_d)/2.;
198 pcpar[5] = abs_d * TMath::Tan(acc_max);
199 pcpar[6] = pcpar[3]+(z_2deg-abs_d);
201 pcpar[8] = z_2deg * TMath::Tan(acc_max);
202 pcpar[9] = -pcpar[3];
203 pcpar[10] = abs_l * TMath::Tan(acc_min);
204 pcpar[11] = abs_l * TMath::Tan(acc_max);
205 gMC->Gsvolu("AITR", "PCON", idtmed[1612], pcpar, 12);
207 // special Pb medium for last 5 cm of Pb
210 cpar[1] = zr * TMath::Tan(theta_r);
211 cpar[2] = zr * TMath::Tan(acc_max);
212 cpar[3] = cpar[1] + TMath::Tan(theta_r) * 5;
213 cpar[4] = cpar[2] + TMath::Tan(acc_max) * 5;
214 gMC->Gsvolu("ARPB", "CONE", idtmed[1632], cpar, 5);
215 dz=(abs_l-abs_d)/2.-cpar[0];
216 gMC->Gspos("ARPB", 1, "AITR", 0., 0., dz, 0, "ONLY");
219 // concrete cone: concrete
221 pcpar[9] = par[3]+(abs_l-d_rear-abs_d);
222 pcpar[10] = (abs_l-d_rear) * TMath::Tan(acc_min);
223 pcpar[11] = (abs_l-d_rear) * TMath::Tan(acc_max);
224 gMC->Gsvolu("ACON", "PCON", idtmed[1616], pcpar, 12);
225 gMC->Gspos("ACON", 1, "AITR", 0., 0., 0., 0, "ONLY");
227 // carbon cone: carbon
229 pcpar[9] = pcpar[3]+(abs_cc-abs_d);
230 pcpar[10] = abs_cc * TMath::Tan(acc_min);
231 pcpar[11] = abs_cc * TMath::Tan(acc_max);
232 gMC->Gsvolu("ACAR", "PCON", idtmed[1605], pcpar, 12);
233 gMC->Gspos("ACAR", 1, "ACON", 0., 0., 0., 0, "ONLY");
238 cpar[1] = zr * TMath::Tan(acc_min);
239 cpar[2] = zr * TMath::Tan(theta_r);
240 cpar[3] = cpar[1] + TMath::Tan(acc_min) * d_rear;
241 cpar[4] = cpar[2] + TMath::Tan(theta_r) * d_rear;
242 gMC->Gsvolu("ARW0", "CONE", idtmed[1611], cpar, 5);
243 dz=(abs_l-abs_d)/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(acc_min);
250 cpar[2] = zr * TMath::Tan(theta_r);
251 cpar[3] = cpar[1] + TMath::Tan(acc_min) * 5.;
252 cpar[4] = cpar[2] + TMath::Tan(theta_r) * 5.;
253 gMC->Gsvolu("ARW1", "CONE", idtmed[1631], cpar, 5);
254 dz=d_rear/2.-cpar[0];
255 gMC->Gspos("ARW1", 1, "ARW0", 0., 0., dz, 0, "ONLY");
257 // PolyEthylene Layers
258 Float_t dr_min=TMath::Tan(theta_r) * 5;
259 Float_t dr_max=TMath::Tan(acc_max) * 5;
260 gMC->Gsvolu("ARPE", "CONE", idtmed[1617], cpar, 0);
262 { // Begin local scope for i
263 for (Int_t i=0; i<3; i++) {
264 zr=abs_l-d_rear+5+i*10.;
265 cpar[1] = zr * TMath::Tan(theta_r);
266 cpar[2] = zr * TMath::Tan(acc_max);
267 cpar[3] = cpar[1] + dr_min;
268 cpar[4] = cpar[2] + dr_max;
269 dz=(abs_l-abs_d)/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 = (abs_l-abs_d)/2.+abs_d;
275 gMC->Gspos("ABSM", 1, "ALIC", 0., 0., dz, 0, "ONLY");
280 // pipe and heating jackets
284 tpar0[2]=(abs_c-abs_d)/2;
287 gMC->Gsvolu("AV11", "TUBE", idtmed[1658], tpar0, 3);
291 tpar[0]=tpar0[0]+d_tube;
292 tpar[1]=tpar0[0]+d_tube+d_insu;
293 gMC->Gsvolu("AI11", "TUBE", idtmed[1653], tpar, 3);
294 gMC->Gspos("AI11", 1, "AV11", 0., 0., 0., 0, "ONLY");
297 tpar[0]=tpar0[1]-d_prot-d_free;
298 tpar[1]=tpar0[1]-d_prot;
299 gMC->Gsvolu("AP11", "TUBE", idtmed[1655], tpar, 3);
300 gMC->Gspos("AP11", 1, "AV11", 0., 0., 0., 0, "ONLY");
302 dz=-(abs_l-abs_d)/2.+tpar0[2];
303 gMC->Gspos("AV11", 1, "ABSM", 0., 0., dz, 0, "ONLY");
307 cpar0[0]=(abs_l-d_rear-abs_c)/2;
310 cpar0[3]=cpar0[1]+2.*cpar0[0]*TMath::Tan(theta_open1);
311 cpar0[4]=cpar0[2]+2.*cpar0[0]*TMath::Tan(theta_open1);
312 gMC->Gsvolu("AV21", "CONE", idtmed[1658], cpar0, 5);
316 cpar[1]=cpar0[1]+d_tube;
317 cpar[2]=cpar0[1]+d_tube+d_insu;
318 cpar[3]=cpar0[3]+d_tube;
319 cpar[4]=cpar0[3]+d_tube+d_insu;
320 gMC->Gsvolu("AI21", "CONE", idtmed[1653], cpar, 5);
321 gMC->Gspos("AI21", 1, "AV21", 0., 0., 0., 0, "ONLY");
324 cpar[1]=cpar0[2]-d_prot-d_free;
325 cpar[2]=cpar0[2]-d_prot;
326 cpar[3]=cpar0[4]-d_prot-d_free;
327 cpar[4]=cpar0[4]-d_prot;
328 gMC->Gsvolu("AP21", "CONE", idtmed[1655], cpar, 5);
329 gMC->Gspos("AP21", 1, "AV21", 0., 0., 0., 0, "ONLY");
331 dz=(abs_l-abs_d)/2.-cpar0[0]-d_rear;
332 gMC->Gspos("AV21", 1, "ABSM", 0., 0., dz, 0, "ONLY");
336 //_____________________________________________________________________________
338 void AliABSOv0::Init()
341 // Initialisation of the muon absorber after it has been built
345 for(i=0;i<35;i++) printf("*");
346 printf(" ABSOv0_INIT ");
347 for(i=0;i<35;i++) printf("*");
350 for(i=0;i<80;i++) printf("*");