START/AliSTARTv1.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   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  **************************************************************************/
  15
  16
  17 /////////////////////////////////////////////////////////////////////
  18 //                                                                 //
  19 // START ( T-zero) detector  version 1                             //
  20 //
  21 //Begin Html
  22 /*
  23 <img src="gif/AliSTARTv1Class.gif">
  24 */
  25 //End Html
  26 //                                                                  //
  27 //                                                                  //
  28 //////////////////////////////////////////////////////////////////////
  29
  30 #include <TMath.h>
  31 #include <TGeometry.h>
  32 #include <TTUBE.h>
  33 #include <TNode.h>
  34 #include <TLorentzVector.h>
  35
  36 #include "AliSTARTv1.h"
  37 #include "AliRun.h"
  38 #include "AliMC.h"
  39 #include "AliMagF.h"
  40 #include "AliSTARThit.h"
  41
  42 #include <iostream.h>
  43 #include <fstream.h>
  44
  45 //#include "TGeant3.h"
  46 #include <stdlib.h>
  47
  48 ClassImp(AliSTARTv1)
  49
  50 //--------------------------------------------------------------------
  51 AliSTARTv1::AliSTARTv1(const char *name, const char *title):
  52  AliSTART(name,title)
  53 {
  54   //
  55   // Standart constructor for START Detector version 0
  56   //
  57   fIdSens1=0;
  58 //  setBufferSize(128000);
  59 }
  60 //-------------------------------------------------------------------------
  61 void AliSTARTv1::CreateGeometry()
  62 {
  63   //
  64   // Create the geometry of START Detector version 0
  65   //
  66   // begin Html
  67   /*
  68    <img src="gif/AliSTARTv0.gif">
  69   */
  70   //
  71
  72
  73   Int_t *idtmed = fIdtmed->GetArray();
  74
  75   Int_t is;
  76   Int_t idrotm[999];
  77   Float_t x,y,z;
  78
  79   Float_t pstart[3]={4.5,10.7,5.3};
  80   Float_t pinstart[3]={0.,1.3,5.25};
  81   Float_t ppmt[3]={0.,1.3,3.5};
  82   Float_t pdivider[3]={0.,1.2,1.75};
  83   Float_t pdiv2[3]={0.,1.2,1.25};
  84   Float_t pdiv1[3]={0.6,1.2,0.5};
  85   Float_t ptop[3]={0.,1.3,1.5};
  86   Float_t pbot[3]={0.6,1.2,0.1};
  87   Float_t pglass[3]={1.2,1.3,2.};
  88   Float_t pcer[3]={0.9,1.1,0.09};
  89   Float_t psteel[3]={0.9,1.1,0.01};
  90   Float_t ppins[3]={0.6,1.2,0.014};
  91   Float_t phole[3]={0.6,1.2,0.015};
  92   Float_t pknob[3]={0.5,0.6,0.4};
  93   Float_t pknob_vac[3]={0.,0.5,0.4};
  94   Float_t pknob_bot[3]={0.,0.6,0.05};
  95   Float_t pribber[3] = {0.,1.2,2.413/2.};
  96   Float_t presist[3] = {0.,1.2,0.087/2.};
  97
  98   Float_t zdetRight=69.7,zdetLeft=355.;
  99  //-------------------------------------------------------------------
 100  //  START volume
 101  //-------------------------------------------------------------------
 102
 103   //  Float_t theta=TMath::ATan(6.5/zdet);
 104   Float_t thetaRight=(180./3.1415)*TMath::ATan(6.5/zdetRight);
 105   Float_t thetaLeft=(180./3.1415)*TMath::ATan(6.5/zdetLeft);
 106     AliMatrix(idrotm[901], 90., 0., 90., 90., 180., 0.);
 107
 108     gMC->Gsvolu("0STR","TUBE",idtmed[1],pstart,3);
 109     gMC->Gsvolu("0STL","TUBE",idtmed[1],pstart,3);
 110     gMC->Gspos("0STR",1,"ALIC",0.,0.,zdetRight+pstart[2],0,"ONLY");
 111     gMC->Gspos("0STL",1,"ALIC",0.,0.,-zdetLeft-pstart[2],idrotm[901],"ONLY");
 112
 113 //START interior
 114     gMC->Gsvolu("0INS","TUBE",idtmed[1],pinstart,3);
 115     gMC->Gsvolu("0PMT","TUBE",idtmed[3],ppmt,3);
 116     gMC->Gsvolu("0DIV","TUBE",idtmed[3],pdivider,3);
 117
 118 // first ring: 12 units of Scintillator+PMT+divider
 119     Double_t dang1 = 2*TMath::Pi()/12;
 120     for (is=1; is<=12; is++)
 121       {
 122         AliMatrix(idrotm[901+is],
 123                   90.-thetaRight, 30.*is,
 124                   90.,       90.+30.*is,
 125                   thetaRight,    180.+30.*is);
 126         x=6.5*TMath::Sin(is*dang1);
 127         y=6.5*TMath::Cos(is*dang1);
 128         z=-pstart[2]+pinstart[2];
 129         gMC->Gspos("0INS",is,"0STR",x,y,z,idrotm[901+is],"ONLY");
 130
 131       }
 132     for (is=1; is<=12; is++)
 133       {
 134         AliMatrix(idrotm[901+is],
 135                   90.-thetaLeft, 30.*is,
 136                   90.,       90.+30.*is,
 137                   thetaLeft,    180.+30.*is);
 138
 139         x=6.5*TMath::Sin(is*dang1);
 140         y=6.5*TMath::Cos(is*dang1);
 141         z=-pstart[2]+pinstart[2];
 142         gMC->Gspos("0INS",is,"0STL",x,y,z,idrotm[901+is],"ONLY");
 143
 144       }
 145      x=0;
 146     y=0;
 147     z=-pinstart[2]+ppmt[2];
 148     if(fDebug) printf("%s: is %d, z Divider %f\n",ClassName(),is,z);
 149     gMC->Gspos("0PMT",1,"0INS",x,y,z,0,"ONLY");
 150     z=pinstart[2]-pdivider[2];
 151     gMC->Gspos("0DIV",1,"0INS",x,y,z,0,"ONLY");
 152
 153      /*
 154 //second ring: 20 units of Scintillator+PMT+divider
 155       Double_t dang2 = 2*TMath::Pi()/26;
 156       Double_t dang3 = 2*TMath::Pi()/20;
 157        for (is=14; is<=33;is++)
 158      {
 159      x=9.3*TMath::Sin(dang2+(is-13)*dang3);
 160      y=9.3*TMath::Cos(dang2+(is-13)*dang3);
 161       z=-pstart[2]+ppmt[2];
 162       gMC->Gspos("0PMT",is,"0STA",x,y,z,0,"ONLY");
 163       z=z+ppmt[2]+pdiv2[2];
 164       gMC->Gspos("0DIV",is,"0STA",x,y,z,0,"ONLY");
 165       }
 166      */
 167 // PMT
 168
 169     // Entry window (glass)
 170     gMC->Gsvolu("0TOP","TUBE",idtmed[6],ptop,3);
 171     z=-ppmt[2]+ptop[2];
 172     gMC->Gspos("0TOP",1,"0PMT",0,0,z,0,"ONLY");
 173     //     printf("Z PTOP %f -ppmt[2] %f ptop[2] %f\n",z,-ppmt[2],ptop[2]);
 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 void AliSTARTv1::CreateMaterials()
 240 {
 241    Int_t isxfld   = gAlice->Field()->Integ();
 242    Float_t sxmgmx = gAlice->Field()->Max();
 243    Float_t a,z,d,radl,absl,buf[1];
 244    Int_t nbuf;
 245
 246 // Scintillator CH
 247    Float_t ascin[2]={1.01,12.01};
 248    Float_t zscin[2]={1,6};
 249    Float_t wscin[2]={1,1};
 250    Float_t denscin=1.03;
 251 // PMT glass SiO2
 252    Float_t aglass[2]={28.0855,15.9994};
 253    Float_t zglass[2]={14.,8.};
 254    Float_t wglass[2]={1.,2.};
 255    Float_t dglass=2.65;
 256 // Ceramic   97.2% Al2O3 , 2.8% SiO2
 257    Float_t acer[2],zcer[2],wcer[2]={0.972,0.028};
 258    Float_t aal2o3[2]  = { 26.981539,15.9994 };
 259    Float_t zal2o3[2]  = { 13.,8. };
 260    Float_t wal2o3[2]  = { 2.,3. };
 261    Float_t denscer  = 3.6;
 262
 263 // Brass 80% Cu, 20% Zn
 264    Float_t abrass[2] = {63.546,65.39};
 265    Float_t zbrass[2] = {29,30};
 266    Float_t wbrass[2] = {0.8,0.2};
 267    Float_t denbrass=8.96;
 268
 269 //Ribber C6H12S
 270    Float_t aribber[3] = {12.,1.,32.};
 271    Float_t zribber[3] = {6.,1.,16.};
 272    Float_t wribber[3] = {6.,12.,1.};
 273    Float_t denribber=0.8;
 274    /*
 275 // Definition Cherenkov parameters
 276    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 };
 277    Float_t rindex_quarz[14] = { 1.528309,1.533333,
 278                                 1.538243,1.544223,1.550568,1.55777,
 279                                 1.565463,1.574765,1.584831,1.597027,
 280                                 1.611858,1.6277,1.6472,1.6724 };
 281
 282    Float_t absco_quarz[14] = { 20.126,16.27,13.49,11.728,9.224,8.38,7.44,7.17,
 283                                 6.324,4.483,1.6,.323,.073,0. };
 284    */
 285
 286 //*** Definition Of avaible START materials ***
 287    AliMaterial(0, "START Steel$", 55.850,26.,7.87,1.76,999);
 288    AliMaterial(1, "START Vacuum$", 1.e-16,1.e-16,1.e-16,1.e16,999);
 289    AliMaterial(2, "START Air$", 14.61, 7.3, .001205, 30423.,999);
 290
 291    AliMixture( 3, "Al2O3   $", aal2o3, zal2o3, denscer, -2, wal2o3);
 292    AliMixture( 4, "PMT glass   $",aglass,zglass,dglass,-2,wglass);
 293    char namate[21];
 294    gMC->Gfmate((*fIdmate)[3], namate, a, z, d, radl, absl, buf, nbuf);
 295    acer[0]=a;
 296    zcer[0]=z;
 297    gMC->Gfmate((*fIdmate)[4], namate, a, z, d, radl, absl, buf, nbuf);
 298    acer[1]=a;
 299    zcer[1]=z;
 300
 301    AliMixture( 9, "Ceramic    $", acer, zcer, denscer, 2, wcer);
 302    AliMixture( 5, "Scintillator$",ascin,zscin,denscin,-2,wscin);
 303    AliMixture( 6, "Brass    $", abrass, zbrass, denbrass, 2, wbrass);
 304
 305    AliMixture( 7, "Ribber $",aribber,zribber,denribber,-3,wribber);
 306
 307
 308    AliMedium(1, "START Air$", 2, 0, isxfld, sxmgmx, 10., .1, 1., .003, .003);
 309    AliMedium(2, "Scintillator$", 5, 1, isxfld, sxmgmx, 10., .01, 1., .003, .003);
 310    AliMedium(3, "Vacuum$", 1, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 311    AliMedium(4, "Ceramic$", 9, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 312    AliMedium(6, "Glass$", 4, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 313    AliMedium(8, "Steel$", 0, 0, isxfld, sxmgmx, 1., .001, 1., .001, .001);
 314    AliMedium(9, "Ribber  $", 7, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 315    AliMedium(11, "Brass  $", 6, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 316    if(fDebug) cout<<ClassName()<<": ++++++++++++++Medium set++++++++++"<<endl;
 317
 318 //  geant3->Gsckov(idtmed[2105], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 319
 320 }
 321 //---------------------------------------------------------------------
 322 void AliSTARTv1::DrawDetector()
 323 {
 324 //
 325 // Draw a shaded view of the Forward multiplicity detector version 0
 326 //
 327
 328   //Set ALIC mother transparent
 329   gMC->Gsatt("ALIC","SEEN",0);
 330   //
 331   //Set volumes visible
 332   //  gMC->Gsatt("0ST","SEEN",0);
 333   gMC->Gsatt("0INS","SEEN",0);
 334   gMC->Gsatt("0PMT","SEEN",1);
 335   gMC->Gsatt("0DIV","SEEN",1);
 336   //
 337   gMC->Gdopt("hide","on");
 338   gMC->Gdopt("shad","on");
 339   gMC->SetClipBox(".");
 340   gMC->SetClipBox("*",0,1000,-1000,1000,-1000,1000);
 341   gMC->DefaultRange();
 342   gMC->Gdraw("alic",40,30,0,12,9.5,.7,0.7);
 343   gMC->Gdhead(1111,"T-Zero detector");
 344   gMC->Gdopt("hide","off");
 345 }
 346
 347 //-------------------------------------------------------------------
 348 void AliSTARTv1::Init()
 349 {
 350 // Initialises version 0 of the Forward Multiplicity Detector
 351 //
 352 //Int_t *idtmed  = gAlice->Idtmed();
 353   AliSTART::Init();
 354   fIdSens1=gMC->VolId("0TOP");
 355   if(fDebug) printf("%s: *** START version 0 initialized ***\n",ClassName());
 356
 357 }
 358
 359 //-------------------------------------------------------------------
 360
 361 void AliSTARTv1::StepManager()
 362 {
 363   //
 364   // Called for every step in the START Detector
 365   //
 366   Int_t id,copy,copy1;
 367   static Float_t hits[7];
 368   static Float_t edep;
 369   static Int_t vol[2];
 370   TLorentzVector pos;
 371
 372   TClonesArray &lhits = *fHits;
 373
 374   if(!gMC->IsTrackAlive()) return; // particle has disappeared
 375   Float_t charge = gMC->TrackCharge();
 376   if(TMath::Abs(charge)<=0.) return; //take only charged particles
 377   id=gMC->CurrentVolID(copy);
 378
 379
 380    // Check the sensetive volume
 381   if(id==fIdSens1 ) {
 382     if(gMC->IsTrackEntering()) {
 383       gMC->CurrentVolOffID(2,copy);
 384       vol[1]=copy;
 385       gMC->CurrentVolOffID(3,copy1);
 386       vol[0]=copy1;
 387       gMC->TrackPosition(pos);
 388       hits[0] = pos[0];
 389       hits[1] = pos[1];
 390       hits[2] = pos[2];
 391       Float_t etot=gMC->Etot();
 392       hits[4]=etot;
 393       Int_t iPart= gMC->TrackPid();
 394       Int_t partID=gMC->IdFromPDG(iPart);
 395       hits[5]=partID;
 396       Float_t ttime=gMC->TrackTime();
 397       hits[6]=ttime*1e9;
 398       edep=0;
 399     }
 400     if(gMC->IsTrackInside())    {
 401       Float_t de=gMC->Edep();
 402       edep=edep+de;
 403     }
 404
 405     if(gMC->IsTrackExiting())   {
 406       Float_t de=gMC->Edep();
 407       edep=edep+de;
 408       hits[3]=edep*1e3;
 409       new(lhits[fNhits++]) AliSTARThit(fIshunt,gAlice->CurrentTrack(),vol,hits);
 410     }
 411   }
 412 //---------------------------------------------------------------------
 413 }
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