START/AliSTARTv0.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
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  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  17
  18 /////////////////////////////////////////////////////////////////////
  19 //                                                                 //
  20 // START ( T-zero) detector  version 0                        //
  21 //
  22 //Begin Html
  23 /*
  24 <img src="gif/AliSTARTv0Class.gif">
  25 */
  26 //End Html
  27 //                                                                  //
  28 //                                                                  //
  29 //////////////////////////////////////////////////////////////////////
  30
  31 #include <Riostream.h>
  32 #include <stdlib.h>
  33
  34 #include <TGeometry.h>
  35 #include <TLorentzVector.h>
  36 #include <TMath.h>
  37 #include <TNode.h>
  38 #include <TTUBE.h>
  39 #include <TVirtualMC.h>
  40
  41 #include "AliMagF.h"
  42 #include "AliRun.h"
  43 #include "AliSTARThit.h"
  44 #include "AliSTARTv0.h"
  45
  46 ClassImp(AliSTARTv0)
  47
  48 //--------------------------------------------------------------------
  49 AliSTARTv0::AliSTARTv0(const char *name, const char *title):
  50  AliSTART(name,title)
  51 {
  52   //
  53   // Standart constructor for START Detector version 0
  54   //
  55   fIdSens1=0;
  56 //  setBufferSize(128000);
  57 }
  58 //-------------------------------------------------------------------------
  59 void AliSTARTv0::CreateGeometry()
  60 {
  61   //
  62   // Create the geometry of START Detector version 0
  63   //
  64   // begin Html
  65   /*
  66    <img src="gif/AliSTARTv0.gif">
  67   */
  68   //
  69
  70
  71   Int_t *idtmed = fIdtmed->GetArray();
  72
  73   Int_t is;
  74   Int_t idrotm[999];
  75   Float_t x,y,z;
  76
  77   Float_t pstart[3]={4.5,10.7,5.3};
  78   Float_t pinstart[3]={0.,1.3,5.25};
  79   Float_t ppmt[3]={0.,1.3,3.5};
  80   Float_t pdivider[3]={0.,1.2,1.75};
  81   Float_t pdiv2[3]={0.,1.2,1.25};
  82   Float_t pdiv1[3]={0.6,1.2,0.5};
  83   Float_t ptop[3]={0.,1.3,1.5};
  84   Float_t pbot[3]={0.6,1.2,0.1};
  85   Float_t pglass[3]={1.2,1.3,2.};
  86   Float_t pcer[3]={0.9,1.1,0.09};
  87   Float_t psteel[3]={0.9,1.1,0.01};
  88   Float_t ppins[3]={0.6,1.2,0.014};
  89   Float_t phole[3]={0.6,1.2,0.015};
  90   Float_t pknob[3]={0.5,0.6,0.4};
  91   Float_t pknob_vac[3]={0.,0.5,0.4};
  92   Float_t pknob_bot[3]={0.,0.6,0.05};
  93   Float_t pribber[3] = {0.,1.2,2.413/2.};
  94   Float_t presist[3] = {0.,1.2,0.087/2.};
  95
  96   Float_t zdetRight=69.7,zdetLeft=350;
  97  //-------------------------------------------------------------------
  98  //  START volume
  99  //-------------------------------------------------------------------
 100
 101   //  Float_t theta=TMath::ATan(6.5/zdet);
 102   Float_t thetaRight=(180./3.1415)*TMath::ATan(6.5/zdetRight);
 103   Float_t thetaLeft=(180./3.1415)*TMath::ATan(6.5/zdetLeft);
 104     AliMatrix(idrotm[901], 90., 0., 90., 90., 180., 0.);
 105
 106     gMC->Gsvolu("0STR","TUBE",idtmed[1],pstart,3);
 107     gMC->Gsvolu("0STL","TUBE",idtmed[1],pstart,3);
 108     gMC->Gspos("0STR",1,"ALIC",0.,0.,zdetRight+pstart[2],0,"ONLY");
 109     gMC->Gspos("0STL",1,"ALIC",0.,0.,-zdetLeft-pstart[2],idrotm[901],"ONLY");
 110
 111 //START interior
 112     gMC->Gsvolu("0INS","TUBE",idtmed[1],pinstart,3);
 113     gMC->Gsvolu("0PMT","TUBE",idtmed[3],ppmt,3);
 114     gMC->Gsvolu("0DIV","TUBE",idtmed[3],pdivider,3);
 115
 116 // first ring: 12 units of Scintillator+PMT+divider
 117     Double_t dang1 = 2*TMath::Pi()/12;
 118     for (is=1; is<=12; is++)
 119       {
 120         AliMatrix(idrotm[901+is],
 121                   90.-thetaRight, 30.*is,
 122                   90.,       90.+30.*is,
 123                   thetaRight,    180.+30.*is);
 124         x=6.5*TMath::Sin(is*dang1);
 125         y=6.5*TMath::Cos(is*dang1);
 126         z=-pstart[2]+pinstart[2];
 127         gMC->Gspos("0INS",is,"0STR",x,y,z,idrotm[901+is],"ONLY");
 128
 129       }
 130     for (is=1; is<=12; is++)
 131       {
 132         AliMatrix(idrotm[901+is],
 133                   90.-thetaLeft, 30.*is,
 134                   90.,       90.+30.*is,
 135                   thetaLeft,    180.+30.*is);
 136
 137         x=6.5*TMath::Sin(is*dang1);
 138         y=6.5*TMath::Cos(is*dang1);
 139         z=-pstart[2]+pinstart[2];
 140         gMC->Gspos("0INS",is,"0STL",x,y,z,idrotm[901+is],"ONLY");
 141
 142       }
 143      x=0;
 144     y=0;
 145     z=-pinstart[2]+ppmt[2];
 146     if(fDebug) printf("%s: is %d, z Divider %f\n",ClassName(),is,z);
 147     gMC->Gspos("0PMT",1,"0INS",x,y,z,0,"ONLY");
 148     z=pinstart[2]-pdivider[2];
 149     gMC->Gspos("0DIV",1,"0INS",x,y,z,0,"ONLY");
 150
 151      /*
 152 //second ring: 20 units of Scintillator+PMT+divider
 153       Double_t dang2 = 2*TMath::Pi()/26;
 154       Double_t dang3 = 2*TMath::Pi()/20;
 155        for (is=14; is<=33;is++)
 156      {
 157      x=9.3*TMath::Sin(dang2+(is-13)*dang3);
 158      y=9.3*TMath::Cos(dang2+(is-13)*dang3);
 159       z=-pstart[2]+ppmt[2];
 160       gMC->Gspos("0PMT",is,"0STA",x,y,z,0,"ONLY");
 161       z=z+ppmt[2]+pdiv2[2];
 162       gMC->Gspos("0DIV",is,"0STA",x,y,z,0,"ONLY");
 163       }
 164      */
 165 // PMT
 166
 167     // Entry window (glass)
 168     // gMC->Gsvolu("0TOP","TUBE",idtmed[6],ptop,3);
 169        gMC->Gsvolu("0TOP","TUBE",idtmed[12],ptop,3); //lucite
 170      z=-ppmt[2]+ptop[2];
 171     gMC->Gspos("0TOP",1,"0PMT",0,0,z,0,"ONLY");
 172     //     printf("Z PTOP %f -ppmt[2] %f ptop[2] %f\n",z,-ppmt[2],ptop[2]);
 173
 174     // Bottom glass
 175     gMC->Gsvolu("0BOT","TUBE",idtmed[6],pbot,3);
 176     z=ppmt[2]-pbot[2];
 177     if(fDebug) printf("%s: Z bottom %f\n",ClassName(),z);
 178     gMC->Gspos("0BOT",1,"0PMT",0,0,z,0,"ONLY");
 179     // Side cylinder glass
 180     gMC->Gsvolu("0OUT","TUBE",idtmed[6],pglass,3);
 181     z=ppmt[2]-pglass[2];
 182     //      printf("Z glass %f\n",z);
 183     gMC->Gspos("0OUT",1,"0PMT",0,0,z,0,"ONLY");
 184     //PMT electrodes support structure
 185     gMC->Gsvolu("0CER","TUBE",idtmed[4],pcer,3);
 186     gMC->Gsvolu("0STE","TUBE",idtmed[8],psteel,3);
 187     z=-ppmt[2]+2*ptop[2]+0.3;;
 188     //      printf("Z Cer 1 %f\n",z);
 189     for (is=1; is<=15; is++)
 190       {
 191         z=z+psteel[2]+pcer[2];
 192         gMC->Gspos("0CER",is,"0PMT",0,0,z,0,"ONLY");
 193         z=z+psteel[2]+pcer[2];
 194         gMC->Gspos("0STE",is,"0PMT",0,0,z,0,"ONLY");
 195       }
 196
 197     // Divider
 198     // Knob at the bottom of PMT baloon
 199
 200     gMC->Gsvolu("0NB","TUBE",idtmed[6],pknob,3);
 201     z=-pdivider[2]+pknob[2];
 202     //      printf("zknob %f\n",z);
 203     gMC->Gspos("0NB",1,"0DIV",0,0,z,0,"ONLY");
 204     gMC->Gsvolu("0KB","TUBE",idtmed[6],pknob_bot,3);
 205     z=-pdivider[2]+2*pknob[2]+pknob_bot[2];
 206     //      printf(knobbot %f\n",z);
 207     gMC->Gspos("0KB",1,"0DIV ",0,0,z,0,"ONLY");
 208     gMC->Gsvolu("0VAC","TUBE",idtmed[3],pknob_vac,3);
 209     z=-pdivider[2]+pknob_vac[2];
 210     //      printf("knobvac %f\n",z);
 211     gMC->Gspos("0VAC",1,"0DIV",0,0,z,0,"ONLY");
 212     //Steel pins + pin holes
 213     gMC->Gsvolu("0PIN","TUBE",idtmed[8],ppins,3);
 214     z=-pdivider[2]+ppins[2];
 215     gMC->Gspos("0PIN",1,"0DIV",0,0,z,0,"ONLY");
 216     gMC->Gsvolu("0HOL","TUBE",idtmed[11],phole,3);
 217     z=-pdivider[2]+2*ppins[2]+phole[2];
 218     gMC->Gspos("0HOL",1,"0DIV",0,0,z,0,"ONLY");
 219
 220     //Socket
 221     gMC->Gsvolu("0V1","TUBE",idtmed[4],pdiv1,3);
 222     z=-pdivider[2]+pdiv1[2];
 223     gMC->Gspos("0V1",1,"0DIV",0,0,z,0,"ONLY");
 224     //Resistors
 225     gMC->Gsvolu("0V2","TUBE",idtmed[1],pdiv2,3);
 226     z=pdivider[2]-pdiv2[2];
 227     gMC->Gspos("0V2",1,"0DIV",0,0,z,0,"ONLY");
 228     gMC->Gsvolu("0RS","TUBE",idtmed[4],presist,3);
 229     z=-pdiv2[2]+presist[2];
 230     gMC->Gspos("0RS",1,"0V2",0,0,z,0,"ONLY");
 231     gMC->Gsvolu("0RB","TUBE",idtmed[9],pribber,3);
 232     z=pdiv2[2]-pribber[2];
 233     gMC->Gspos("0RB",1,"0V2",0,0,z,0,"ONLY");
 234     //      printf("z DRIB %f\n",z);
 235
 236
 237 }
 238
 239
 240
 241
 242 //------------------------------------------------------------------------
 243 void AliSTARTv0::CreateMaterials()
 244 {
 245    Int_t isxfld   = gAlice->Field()->Integ();
 246    Float_t sxmgmx = gAlice->Field()->Max();
 247    Float_t a,z,d,radl,absl,buf[1];
 248    Int_t nbuf;
 249
 250 // Scintillator CH
 251    Float_t ascin[2]={1.01,12.01};
 252    Float_t zscin[2]={1,6};
 253    Float_t wscin[2]={1,1};
 254    Float_t denscin=1.03;
 255 // PMT glass SiO2
 256    Float_t aglass[2]={28.0855,15.9994};
 257    Float_t zglass[2]={14.,8.};
 258    Float_t wglass[2]={1.,2.};
 259    Float_t dglass=2.65;
 260 // Ceramic   97.2% Al2O3 , 2.8% SiO2
 261    Float_t acer[2],zcer[2],wcer[2]={0.972,0.028};
 262    Float_t aal2o3[2]  = { 26.981539,15.9994 };
 263    Float_t zal2o3[2]  = { 13.,8. };
 264    Float_t wal2o3[2]  = { 2.,3. };
 265    Float_t denscer  = 3.6;
 266
 267 // Brass 80% Cu, 20% Zn
 268    Float_t abrass[2] = {63.546,65.39};
 269    Float_t zbrass[2] = {29,30};
 270    Float_t wbrass[2] = {0.8,0.2};
 271    Float_t denbrass=8.96;
 272
 273 //Ribber C6H12S
 274    Float_t aribber[3] = {12.,1.,32.};
 275    Float_t zribber[3] = {6.,1.,16.};
 276    Float_t wribber[3] = {6.,12.,1.};
 277    Float_t denribber=0.8;
 278    /*
 279 // Definition Cherenkov parameters
 280    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 };
 281    Float_t rindex_quarz[14] = { 1.528309,1.533333,
 282                                 1.538243,1.544223,1.550568,1.55777,
 283                                 1.565463,1.574765,1.584831,1.597027,
 284                                 1.611858,1.6277,1.6472,1.6724 };
 285
 286    Float_t absco_quarz[14] = { 20.126,16.27,13.49,11.728,9.224,8.38,7.44,7.17,
 287                                 6.324,4.483,1.6,.323,.073,0. };
 288    */
 289    //   Int_t *idtmed = fIdtmed->GetArray()-999;
 290
 291    //  TGeant3 *geant3 = (TGeant3*) gMC;
 292
 293 //*** Definition Of avaible START materials ***
 294    AliMaterial(0, "START Steel$", 55.850,26.,7.87,1.76,999);
 295    AliMaterial(1, "START Vacuum$", 1.e-16,1.e-16,1.e-16,1.e16,999);
 296    AliMaterial(2, "START Air$", 14.61, 7.3, .001205, 30423.,999);
 297
 298    AliMixture( 3, "Al2O3   $", aal2o3, zal2o3, denscer, -2, wal2o3);
 299    AliMixture( 4, "PMT glass   $",aglass,zglass,dglass,-2,wglass);
 300    char namate[21]="";
 301    gMC->Gfmate((*fIdmate)[3], namate, a, z, d, radl, absl, buf, nbuf);
 302    acer[0]=a;
 303    zcer[0]=z;
 304    gMC->Gfmate((*fIdmate)[4], namate, a, z, d, radl, absl, buf, nbuf);
 305    acer[1]=a;
 306    zcer[1]=z;
 307
 308    AliMixture( 9, "Ceramic    $", acer, zcer, denscer, 2, wcer);
 309    AliMixture( 5, "Scintillator$",ascin,zscin,denscin,-2,wscin);
 310    AliMixture( 6, "Brass    $", abrass, zbrass, denbrass, 2, wbrass);
 311
 312    AliMixture( 7, "Ribber $",aribber,zribber,denribber,-3,wribber);
 313
 314
 315    AliMedium(1, "START Air$", 2, 0, isxfld, sxmgmx, 10., .1, 1., .003, .003);
 316    AliMedium(2, "Scintillator$", 5, 1, isxfld, sxmgmx, 10., .01, 1., .003, .003);
 317    AliMedium(3, "Vacuum$", 1, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 318    AliMedium(4, "Ceramic$", 9, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 319    AliMedium(6, "Glass$", 4, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 320    AliMedium(8, "Steel$", 0, 0, isxfld, sxmgmx, 1., .001, 1., .001, .001);
 321    AliMedium(11, "Brass  $", 6, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 322    AliMedium(9, "Ribber  $", 7, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 323    AliMedium(12, "Lucite$", 8, 1, isxfld, sxmgmx, 10., .01, 1., .003, .003);
 324
 325 //  geant3->Gsckov(idtmed[2105], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 326
 327 }
 328 //---------------------------------------------------------------------
 329 void AliSTARTv0::DrawModule()
 330 {
 331 //
 332 // Draw a shaded view of the Forward multiplicity detector version 0
 333 //
 334
 335   //Set ALIC mother transparent
 336   gMC->Gsatt("ALIC","SEEN",0);
 337   //
 338   //Set volumes visible
 339   gMC->Gsatt("0STA","SEEN",0);
 340   gMC->Gsatt("0PMT","SEEN",1);
 341   gMC->Gsatt("0DIV","SEEN",1);
 342   //
 343   gMC->Gdopt("hide","on");
 344   gMC->Gdopt("shad","on");
 345   gMC->SetClipBox(".");
 346   gMC->SetClipBox("*",0,1000,-1000,1000,-1000,1000);
 347   gMC->DefaultRange();
 348   gMC->Gdraw("alic",40,30,0,12,9.5,.7,0.7);
 349   gMC->Gdhead(1111,"T-Zero detector");
 350   gMC->Gdopt("hide","off");
 351 }
 352
 353 //-------------------------------------------------------------------
 354 void AliSTARTv0::Init()
 355 {
 356 // Initialises version 0 of the Forward Multiplicity Detector
 357 //
 358 //Int_t *idtmed  = gAlice->Idtmed();
 359   AliSTART::Init();
 360   fIdSens1=gMC->VolId("0TOP");
 361   printf("*** START version 0 initialized ***\n");
 362
 363 }
 364
 365 //-------------------------------------------------------------------
 366
 367 void AliSTARTv0::StepManager()
 368 {
 369   //
 370   // Called for every step in the START Detector
 371   // See AliSTARTv1
 372
 373 }
 374 //---------------------------------------------------------------------
 375
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