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 1.13 2001/09/19 18:41:59 alla
19 Asimmetric START geometry
21 Revision 1.12 2001/04/25 14:09:34 alla
24 Revision 1.11 2001/04/04 12:10:18 alla
25 changes according Coding Convension
27 Revision 1.10 2000/12/04 08:48:19 alibrary
28 Fixing problems in the HEAD
30 Revision 1.9 2000/10/02 21:28:13 fca
31 Removal of useless dependecies via forward declarations
33 Revision 1.8 2000/07/13 16:41:29 fca
34 New START corrected for coding conventions
36 Revision 1.7 2000/01/21 15:45:23 fca
39 Revision 1.6 1999/11/12 15:04:00 fca
40 Modifications from A.Maevskaya
42 Revision 1.5 1999/09/29 09:24:29 fca
43 Introduction of the Copyright and cvs Log
47 /////////////////////////////////////////////////////////////////////
49 // START ( T-zero) detector version 0 //
53 <img src="gif/AliSTARTv0Class.gif">
58 //////////////////////////////////////////////////////////////////////
61 #include <TGeometry.h>
64 #include <TLorentzVector.h>
66 #include "AliSTARTv0.h"
70 #include "AliSTARThit.h"
75 //#include "TGeant3.h"
80 //--------------------------------------------------------------------
81 AliSTARTv0::AliSTARTv0(const char *name, const char *title):
85 // Standart constructor for START Detector version 0
88 // setBufferSize(128000);
90 //-------------------------------------------------------------------------
91 void AliSTARTv0::CreateGeometry()
94 // Create the geometry of START Detector version 0
98 <img src="gif/AliSTARTv0.gif">
103 Int_t *idtmed = fIdtmed->GetArray();
109 Float_t pstart[3]={4.5,10.7,5.3};
110 Float_t pinstart[3]={0.,1.3,5.25};
111 Float_t ppmt[3]={0.,1.3,3.5};
112 Float_t pdivider[3]={0.,1.2,1.75};
113 Float_t pdiv2[3]={0.,1.2,1.25};
114 Float_t pdiv1[3]={0.6,1.2,0.5};
115 Float_t ptop[3]={0.,1.3,1.5};
116 Float_t pbot[3]={0.6,1.2,0.1};
117 Float_t pglass[3]={1.2,1.3,2.};
118 Float_t pcer[3]={0.9,1.1,0.09};
119 Float_t psteel[3]={0.9,1.1,0.01};
120 Float_t ppins[3]={0.6,1.2,0.014};
121 Float_t phole[3]={0.6,1.2,0.015};
122 Float_t pknob[3]={0.5,0.6,0.4};
123 Float_t pknob_vac[3]={0.,0.5,0.4};
124 Float_t pknob_bot[3]={0.,0.6,0.05};
125 Float_t pribber[3] = {0.,1.2,2.413/2.};
126 Float_t presist[3] = {0.,1.2,0.087/2.};
128 Float_t zdetRight=69.7,zdetLeft=350;
129 //-------------------------------------------------------------------
131 //-------------------------------------------------------------------
133 // Float_t theta=TMath::ATan(6.5/zdet);
134 Float_t thetaRight=(180./3.1415)*TMath::ATan(6.5/zdetRight);
135 Float_t thetaLeft=(180./3.1415)*TMath::ATan(6.5/zdetLeft);
136 AliMatrix(idrotm[901], 90., 0., 90., 90., 180., 0.);
138 gMC->Gsvolu("0STR","TUBE",idtmed[1],pstart,3);
139 gMC->Gsvolu("0STL","TUBE",idtmed[1],pstart,3);
140 gMC->Gspos("0STR",1,"ALIC",0.,0.,zdetRight+pstart[2],0,"ONLY");
141 gMC->Gspos("0STL",1,"ALIC",0.,0.,-zdetLeft-pstart[2],idrotm[901],"ONLY");
144 gMC->Gsvolu("0INS","TUBE",idtmed[1],pinstart,3);
145 gMC->Gsvolu("0PMT","TUBE",idtmed[3],ppmt,3);
146 gMC->Gsvolu("0DIV","TUBE",idtmed[3],pdivider,3);
148 // first ring: 12 units of Scintillator+PMT+divider
149 Double_t dang1 = 2*TMath::Pi()/12;
150 for (is=1; is<=12; is++)
152 AliMatrix(idrotm[901+is],
153 90.-thetaRight, 30.*is,
155 thetaRight, 180.+30.*is);
156 x=6.5*TMath::Sin(is*dang1);
157 y=6.5*TMath::Cos(is*dang1);
158 z=-pstart[2]+pinstart[2];
159 gMC->Gspos("0INS",is,"0STR",x,y,z,idrotm[901+is],"ONLY");
162 for (is=1; is<=12; is++)
164 AliMatrix(idrotm[901+is],
165 90.-thetaLeft, 30.*is,
167 thetaLeft, 180.+30.*is);
169 x=6.5*TMath::Sin(is*dang1);
170 y=6.5*TMath::Cos(is*dang1);
171 z=-pstart[2]+pinstart[2];
172 gMC->Gspos("0INS",is,"0STL",x,y,z,idrotm[901+is],"ONLY");
177 z=-pinstart[2]+ppmt[2];
178 if(fDebug) printf("%s: is %d, z Divider %f\n",ClassName(),is,z);
179 gMC->Gspos("0PMT",1,"0INS",x,y,z,0,"ONLY");
180 z=pinstart[2]-pdivider[2];
181 gMC->Gspos("0DIV",1,"0INS",x,y,z,0,"ONLY");
184 //second ring: 20 units of Scintillator+PMT+divider
185 Double_t dang2 = 2*TMath::Pi()/26;
186 Double_t dang3 = 2*TMath::Pi()/20;
187 for (is=14; is<=33;is++)
189 x=9.3*TMath::Sin(dang2+(is-13)*dang3);
190 y=9.3*TMath::Cos(dang2+(is-13)*dang3);
191 z=-pstart[2]+ppmt[2];
192 gMC->Gspos("0PMT",is,"0STA",x,y,z,0,"ONLY");
193 z=z+ppmt[2]+pdiv2[2];
194 gMC->Gspos("0DIV",is,"0STA",x,y,z,0,"ONLY");
199 // Entry window (glass)
200 // gMC->Gsvolu("0TOP","TUBE",idtmed[6],ptop,3);
201 gMC->Gsvolu("0TOP","TUBE",idtmed[12],ptop,3); //lucite
203 gMC->Gspos("0TOP",1,"0PMT",0,0,z,0,"ONLY");
204 // printf("Z PTOP %f -ppmt[2] %f ptop[2] %f\n",z,-ppmt[2],ptop[2]);
207 gMC->Gsvolu("0BOT","TUBE",idtmed[6],pbot,3);
209 if(fDebug) printf("%s: Z bottom %f\n",ClassName(),z);
210 gMC->Gspos("0BOT",1,"0PMT",0,0,z,0,"ONLY");
211 // Side cylinder glass
212 gMC->Gsvolu("0OUT","TUBE",idtmed[6],pglass,3);
214 // printf("Z glass %f\n",z);
215 gMC->Gspos("0OUT",1,"0PMT",0,0,z,0,"ONLY");
216 //PMT electrodes support structure
217 gMC->Gsvolu("0CER","TUBE",idtmed[4],pcer,3);
218 gMC->Gsvolu("0STE","TUBE",idtmed[8],psteel,3);
219 z=-ppmt[2]+2*ptop[2]+0.3;;
220 // printf("Z Cer 1 %f\n",z);
221 for (is=1; is<=15; is++)
223 z=z+psteel[2]+pcer[2];
224 gMC->Gspos("0CER",is,"0PMT",0,0,z,0,"ONLY");
225 z=z+psteel[2]+pcer[2];
226 gMC->Gspos("0STE",is,"0PMT",0,0,z,0,"ONLY");
230 // Knob at the bottom of PMT baloon
232 gMC->Gsvolu("0NB","TUBE",idtmed[6],pknob,3);
233 z=-pdivider[2]+pknob[2];
234 // printf("zknob %f\n",z);
235 gMC->Gspos("0NB",1,"0DIV",0,0,z,0,"ONLY");
236 gMC->Gsvolu("0KB","TUBE",idtmed[6],pknob_bot,3);
237 z=-pdivider[2]+2*pknob[2]+pknob_bot[2];
238 // printf(knobbot %f\n",z);
239 gMC->Gspos("0KB",1,"0DIV ",0,0,z,0,"ONLY");
240 gMC->Gsvolu("0VAC","TUBE",idtmed[3],pknob_vac,3);
241 z=-pdivider[2]+pknob_vac[2];
242 // printf("knobvac %f\n",z);
243 gMC->Gspos("0VAC",1,"0DIV",0,0,z,0,"ONLY");
244 //Steel pins + pin holes
245 gMC->Gsvolu("0PIN","TUBE",idtmed[8],ppins,3);
246 z=-pdivider[2]+ppins[2];
247 gMC->Gspos("0PIN",1,"0DIV",0,0,z,0,"ONLY");
248 gMC->Gsvolu("0HOL","TUBE",idtmed[11],phole,3);
249 z=-pdivider[2]+2*ppins[2]+phole[2];
250 gMC->Gspos("0HOL",1,"0DIV",0,0,z,0,"ONLY");
253 gMC->Gsvolu("0V1","TUBE",idtmed[4],pdiv1,3);
254 z=-pdivider[2]+pdiv1[2];
255 gMC->Gspos("0V1",1,"0DIV",0,0,z,0,"ONLY");
257 gMC->Gsvolu("0V2","TUBE",idtmed[1],pdiv2,3);
258 z=pdivider[2]-pdiv2[2];
259 gMC->Gspos("0V2",1,"0DIV",0,0,z,0,"ONLY");
260 gMC->Gsvolu("0RS","TUBE",idtmed[4],presist,3);
261 z=-pdiv2[2]+presist[2];
262 gMC->Gspos("0RS",1,"0V2",0,0,z,0,"ONLY");
263 gMC->Gsvolu("0RB","TUBE",idtmed[9],pribber,3);
264 z=pdiv2[2]-pribber[2];
265 gMC->Gspos("0RB",1,"0V2",0,0,z,0,"ONLY");
266 // printf("z DRIB %f\n",z);
274 //------------------------------------------------------------------------
275 void AliSTARTv0::CreateMaterials()
277 Int_t isxfld = gAlice->Field()->Integ();
278 Float_t sxmgmx = gAlice->Field()->Max();
279 Float_t a,z,d,radl,absl,buf[1];
283 Float_t ascin[2]={1.01,12.01};
284 Float_t zscin[2]={1,6};
285 Float_t wscin[2]={1,1};
286 Float_t denscin=1.03;
288 Float_t aglass[2]={28.0855,15.9994};
289 Float_t zglass[2]={14.,8.};
290 Float_t wglass[2]={1.,2.};
292 // Ceramic 97.2% Al2O3 , 2.8% SiO2
293 Float_t acer[2],zcer[2],wcer[2]={0.972,0.028};
294 Float_t aal2o3[2] = { 26.981539,15.9994 };
295 Float_t zal2o3[2] = { 13.,8. };
296 Float_t wal2o3[2] = { 2.,3. };
297 Float_t denscer = 3.6;
299 // Brass 80% Cu, 20% Zn
300 Float_t abrass[2] = {63.546,65.39};
301 Float_t zbrass[2] = {29,30};
302 Float_t wbrass[2] = {0.8,0.2};
303 Float_t denbrass=8.96;
306 Float_t aribber[3] = {12.,1.,32.};
307 Float_t zribber[3] = {6.,1.,16.};
308 Float_t wribber[3] = {6.,12.,1.};
309 Float_t denribber=0.8;
311 // Definition Cherenkov parameters
312 Float_t ppckov[14] = { 5.63e-9,5.77e-9,5.9e-9,6.05e-9,6.2e-9,6.36e-9,6.52e-9,6.7e-9,6.88e-9,7.08e-9,7.3e-9,7.51e-9,7.74e-9,8e-9 };
313 Float_t rindex_quarz[14] = { 1.528309,1.533333,
314 1.538243,1.544223,1.550568,1.55777,
315 1.565463,1.574765,1.584831,1.597027,
316 1.611858,1.6277,1.6472,1.6724 };
318 Float_t absco_quarz[14] = { 20.126,16.27,13.49,11.728,9.224,8.38,7.44,7.17,
319 6.324,4.483,1.6,.323,.073,0. };
321 // Int_t *idtmed = fIdtmed->GetArray()-999;
323 // TGeant3 *geant3 = (TGeant3*) gMC;
325 //*** Definition Of avaible START materials ***
326 AliMaterial(0, "START Steel$", 55.850,26.,7.87,1.76,999);
327 AliMaterial(1, "START Vacuum$", 1.e-16,1.e-16,1.e-16,1.e16,999);
328 AliMaterial(2, "START Air$", 14.61, 7.3, .001205, 30423.,999);
330 AliMixture( 3, "Al2O3 $", aal2o3, zal2o3, denscer, -2, wal2o3);
331 AliMixture( 4, "PMT glass $",aglass,zglass,dglass,-2,wglass);
333 gMC->Gfmate((*fIdmate)[3], namate, a, z, d, radl, absl, buf, nbuf);
336 gMC->Gfmate((*fIdmate)[4], namate, a, z, d, radl, absl, buf, nbuf);
340 AliMixture( 9, "Ceramic $", acer, zcer, denscer, 2, wcer);
341 AliMixture( 5, "Scintillator$",ascin,zscin,denscin,-2,wscin);
342 AliMixture( 6, "Brass $", abrass, zbrass, denbrass, 2, wbrass);
344 AliMixture( 7, "Ribber $",aribber,zribber,denribber,-3,wribber);
347 AliMedium(1, "START Air$", 2, 0, isxfld, sxmgmx, 10., .1, 1., .003, .003);
348 AliMedium(2, "Scintillator$", 5, 1, isxfld, sxmgmx, 10., .01, 1., .003, .003);
349 AliMedium(3, "Vacuum$", 1, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
350 AliMedium(4, "Ceramic$", 9, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
351 AliMedium(6, "Glass$", 4, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
352 AliMedium(8, "Steel$", 0, 0, isxfld, sxmgmx, 1., .001, 1., .001, .001);
353 AliMedium(11, "Brass $", 6, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
354 AliMedium(9, "Ribber $", 7, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
355 AliMedium(12, "Lucite$", 8, 1, isxfld, sxmgmx, 10., .01, 1., .003, .003);
357 // geant3->Gsckov(idtmed[2105], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
360 //---------------------------------------------------------------------
361 void AliSTARTv0::DrawModule()
364 // Draw a shaded view of the Forward multiplicity detector version 0
367 //Set ALIC mother transparent
368 gMC->Gsatt("ALIC","SEEN",0);
370 //Set volumes visible
371 gMC->Gsatt("0STA","SEEN",0);
372 gMC->Gsatt("0PMT","SEEN",1);
373 gMC->Gsatt("0DIV","SEEN",1);
375 gMC->Gdopt("hide","on");
376 gMC->Gdopt("shad","on");
377 gMC->SetClipBox(".");
378 gMC->SetClipBox("*",0,1000,-1000,1000,-1000,1000);
380 gMC->Gdraw("alic",40,30,0,12,9.5,.7,0.7);
381 gMC->Gdhead(1111,"T-Zero detector");
382 gMC->Gdopt("hide","off");
385 //-------------------------------------------------------------------
386 void AliSTARTv0::Init()
388 // Initialises version 0 of the Forward Multiplicity Detector
390 //Int_t *idtmed = gAlice->Idtmed();
392 fIdSens1=gMC->VolId("0TOP");
393 printf("*** START version 0 initialized ***\n");
397 //-------------------------------------------------------------------
399 void AliSTARTv0::StepManager()
402 // Called for every step in the START Detector
406 //---------------------------------------------------------------------