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  *                                                                        *
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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     *
  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 "AliMagF.h"
  39 #include "AliSTARThit.h"
  40
  41 #include <Riostream.h>
  42
  43 #include <stdlib.h>
  44
  45 ClassImp(AliSTARTv1)
  46
  47 //--------------------------------------------------------------------
  48 AliSTARTv1::AliSTARTv1(const char *name, const char *title):
  49  AliSTART(name,title)
  50 {
  51   //
  52   // Standart constructor for START Detector version 0
  53   //
  54   fIdSens1=0;
  55 //  setBufferSize(128000);
  56 }
  57 //-------------------------------------------------------------------------
  58 void AliSTARTv1::CreateGeometry()
  59 {
  60   //
  61   // Create the geometry of START Detector version 0
  62   //
  63   // begin Html
  64   /*
  65    <img src="gif/AliSTARTv0.gif">
  66   */
  67   //
  68
  69
  70   Int_t *idtmed = fIdtmed->GetArray();
  71
  72   Int_t is;
  73   Int_t idrotm[999];
  74   Float_t x,y,z;
  75
  76   Float_t pstart[3]={4.5,10.7,5.3};
  77   Float_t pinstart[3]={0.,1.3,5.25};
  78   Float_t ppmt[3]={0.,1.3,3.5};
  79   Float_t pdivider[3]={0.,1.2,1.75};
  80   Float_t pdiv2[3]={0.,1.2,1.25};
  81   Float_t pdiv1[3]={0.6,1.2,0.5};
  82   Float_t ptop[3]={0.,1.3,1.5};
  83   Float_t pbot[3]={0.6,1.2,0.1};
  84   Float_t pglass[3]={1.2,1.3,2.};
  85   Float_t pcer[3]={0.9,1.1,0.09};
  86   Float_t psteel[3]={0.9,1.1,0.01};
  87   Float_t ppins[3]={0.6,1.2,0.014};
  88   Float_t phole[3]={0.6,1.2,0.015};
  89   Float_t pknob[3]={0.5,0.6,0.4};
  90   Float_t pknob_vac[3]={0.,0.5,0.4};
  91   Float_t pknob_bot[3]={0.,0.6,0.05};
  92   Float_t pribber[3] = {0.,1.2,2.413/2.};
  93   Float_t presist[3] = {0.,1.2,0.087/2.};
  94
  95   Float_t zdetRight=69.7,zdetLeft=350;
  96  //-------------------------------------------------------------------
  97  //  START volume
  98  //-------------------------------------------------------------------
  99
 100   //  Float_t theta=TMath::ATan(6.5/zdet);
 101   Float_t thetaRight=(180./3.1415)*TMath::ATan(6.5/zdetRight);
 102   Float_t thetaLeft=(180./3.1415)*TMath::ATan(6.5/zdetLeft);
 103     AliMatrix(idrotm[901], 90., 0., 90., 90., 180., 0.);
 104
 105     gMC->Gsvolu("0STR","TUBE",idtmed[1],pstart,3);
 106     gMC->Gsvolu("0STL","TUBE",idtmed[1],pstart,3);
 107     gMC->Gspos("0STR",1,"ALIC",0.,0.,zdetRight+pstart[2],0,"ONLY");
 108     gMC->Gspos("0STL",1,"ALIC",0.,0.,-zdetLeft-pstart[2],idrotm[901],"ONLY");
 109
 110 //START interior
 111     gMC->Gsvolu("0INS","TUBE",idtmed[1],pinstart,3);
 112     gMC->Gsvolu("0PMT","TUBE",idtmed[3],ppmt,3);
 113     gMC->Gsvolu("0DIV","TUBE",idtmed[3],pdivider,3);
 114
 115 // first ring: 12 units of Scintillator+PMT+divider
 116     Double_t dang1 = 2*TMath::Pi()/12;
 117     for (is=1; is<=12; is++)
 118       {
 119         AliMatrix(idrotm[901+is],
 120                   90.-thetaRight, 30.*is,
 121                   90.,       90.+30.*is,
 122                   thetaRight,    180.+30.*is);
 123         x=6.5*TMath::Sin(is*dang1);
 124         y=6.5*TMath::Cos(is*dang1);
 125         z=-pstart[2]+pinstart[2];
 126         gMC->Gspos("0INS",is,"0STR",x,y,z,idrotm[901+is],"ONLY");
 127
 128       }
 129     for (is=1; is<=12; is++)
 130       {
 131         AliMatrix(idrotm[901+is],
 132                   90.-thetaLeft, 30.*is,
 133                   90.,       90.+30.*is,
 134                   thetaLeft,    180.+30.*is);
 135
 136         x=6.5*TMath::Sin(is*dang1);
 137         y=6.5*TMath::Cos(is*dang1);
 138         z=-pstart[2]+pinstart[2];
 139         gMC->Gspos("0INS",is,"0STL",x,y,z,idrotm[901+is],"ONLY");
 140
 141       }
 142      x=0;
 143     y=0;
 144     z=-pinstart[2]+ppmt[2];
 145     if(fDebug) printf("%s: is %d, z Divider %f\n",ClassName(),is,z);
 146     gMC->Gspos("0PMT",1,"0INS",x,y,z,0,"ONLY");
 147     z=pinstart[2]-pdivider[2];
 148     gMC->Gspos("0DIV",1,"0INS",x,y,z,0,"ONLY");
 149
 150      /*
 151 //second ring: 20 units of Scintillator+PMT+divider
 152       Double_t dang2 = 2*TMath::Pi()/26;
 153       Double_t dang3 = 2*TMath::Pi()/20;
 154        for (is=14; is<=33;is++)
 155      {
 156      x=9.3*TMath::Sin(dang2+(is-13)*dang3);
 157      y=9.3*TMath::Cos(dang2+(is-13)*dang3);
 158       z=-pstart[2]+ppmt[2];
 159       gMC->Gspos("0PMT",is,"0STA",x,y,z,0,"ONLY");
 160       z=z+ppmt[2]+pdiv2[2];
 161       gMC->Gspos("0DIV",is,"0STA",x,y,z,0,"ONLY");
 162       }
 163      */
 164 // PMT
 165
 166     // Entry window (glass)
 167     gMC->Gsvolu("0TOP","TUBE",idtmed[6],ptop,3); //glass
 168      //   gMC->Gsvolu("0TOP","TUBE",idtmed[12],ptop,3); //lucite
 169      z=-ppmt[2]+ptop[2];
 170     gMC->Gspos("0TOP",1,"0PMT",0,0,z,0,"ONLY");
 171     //     printf("Z PTOP %f -ppmt[2] %f ptop[2] %f\n",z,-ppmt[2],ptop[2]);
 172
 173     // Bottom glass
 174     gMC->Gsvolu("0BOT","TUBE",idtmed[6],pbot,3);
 175     z=ppmt[2]-pbot[2];
 176     if(fDebug) printf("%s: Z bottom %f\n",ClassName(),z);
 177     gMC->Gspos("0BOT",1,"0PMT",0,0,z,0,"ONLY");
 178     // Side cylinder glass
 179     gMC->Gsvolu("0OUT","TUBE",idtmed[6],pglass,3);
 180     z=ppmt[2]-pglass[2];
 181     //      printf("Z glass %f\n",z);
 182     gMC->Gspos("0OUT",1,"0PMT",0,0,z,0,"ONLY");
 183     //PMT electrodes support structure
 184     gMC->Gsvolu("0CER","TUBE",idtmed[4],pcer,3);
 185     gMC->Gsvolu("0STE","TUBE",idtmed[8],psteel,3);
 186     z=-ppmt[2]+2*ptop[2]+0.3;;
 187     //      printf("Z Cer 1 %f\n",z);
 188     for (is=1; is<=15; is++)
 189       {
 190         z=z+psteel[2]+pcer[2];
 191         gMC->Gspos("0CER",is,"0PMT",0,0,z,0,"ONLY");
 192         z=z+psteel[2]+pcer[2];
 193         gMC->Gspos("0STE",is,"0PMT",0,0,z,0,"ONLY");
 194       }
 195
 196     // Divider
 197     // Knob at the bottom of PMT baloon
 198
 199     gMC->Gsvolu("0NB","TUBE",idtmed[6],pknob,3);
 200     z=-pdivider[2]+pknob[2];
 201     //      printf("zknob %f\n",z);
 202     gMC->Gspos("0NB",1,"0DIV",0,0,z,0,"ONLY");
 203     gMC->Gsvolu("0KB","TUBE",idtmed[6],pknob_bot,3);
 204     z=-pdivider[2]+2*pknob[2]+pknob_bot[2];
 205     //      printf(knobbot %f\n",z);
 206     gMC->Gspos("0KB",1,"0DIV ",0,0,z,0,"ONLY");
 207     gMC->Gsvolu("0VAC","TUBE",idtmed[3],pknob_vac,3);
 208     z=-pdivider[2]+pknob_vac[2];
 209     //      printf("knobvac %f\n",z);
 210     gMC->Gspos("0VAC",1,"0DIV",0,0,z,0,"ONLY");
 211     //Steel pins + pin holes
 212     gMC->Gsvolu("0PIN","TUBE",idtmed[8],ppins,3);
 213     z=-pdivider[2]+ppins[2];
 214     gMC->Gspos("0PIN",1,"0DIV",0,0,z,0,"ONLY");
 215     gMC->Gsvolu("0HOL","TUBE",idtmed[11],phole,3);
 216     z=-pdivider[2]+2*ppins[2]+phole[2];
 217     gMC->Gspos("0HOL",1,"0DIV",0,0,z,0,"ONLY");
 218
 219     //Socket
 220     gMC->Gsvolu("0V1","TUBE",idtmed[4],pdiv1,3);
 221     z=-pdivider[2]+pdiv1[2];
 222     gMC->Gspos("0V1",1,"0DIV",0,0,z,0,"ONLY");
 223     //Resistors
 224     gMC->Gsvolu("0V2","TUBE",idtmed[1],pdiv2,3);
 225     z=pdivider[2]-pdiv2[2];
 226     gMC->Gspos("0V2",1,"0DIV",0,0,z,0,"ONLY");
 227     gMC->Gsvolu("0RS","TUBE",idtmed[4],presist,3);
 228     z=-pdiv2[2]+presist[2];
 229     gMC->Gspos("0RS",1,"0V2",0,0,z,0,"ONLY");
 230     gMC->Gsvolu("0RB","TUBE",idtmed[9],pribber,3);
 231     z=pdiv2[2]-pribber[2];
 232     gMC->Gspos("0RB",1,"0V2",0,0,z,0,"ONLY");
 233     //      printf("z DRIB %f\n",z);
 234
 235
 236 }
 237 //------------------------------------------------------------------------
 238 void AliSTARTv1::CreateMaterials()
 239 {
 240    Int_t isxfld   = gAlice->Field()->Integ();
 241    Float_t sxmgmx = gAlice->Field()->Max();
 242    Float_t a,z,d,radl,absl,buf[1];
 243    Int_t nbuf;
 244
 245 // Scintillator CH
 246    Float_t ascin[2]={1.01,12.01};
 247    Float_t zscin[2]={1,6};
 248    Float_t wscin[2]={1,1};
 249    Float_t denscin=1.03;
 250 //Lucite C(CH3)CO2CH3
 251    Float_t alucite[3]={1.01,12.01,15.999};
 252    Float_t zlucite[3]={1,6,8};
 253    Float_t wlucite[3]={8,5,2};
 254    Float_t denlucite=1.16;
 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
 290 //*** Definition Of avaible START materials ***
 291    AliMaterial(0, "START Steel$", 55.850,26.,7.87,1.76,999);
 292    AliMaterial(1, "START Vacuum$", 1.e-16,1.e-16,1.e-16,1.e16,999);
 293    AliMaterial(2, "START Air$", 14.61, 7.3, .001205, 30423.,999);
 294
 295    AliMixture( 3, "Al2O3   $", aal2o3, zal2o3, denscer, -2, wal2o3);
 296    AliMixture( 4, "PMT glass   $",aglass,zglass,dglass,-2,wglass);
 297    char namate[21];
 298    gMC->Gfmate((*fIdmate)[3], namate, a, z, d, radl, absl, buf, nbuf);
 299    acer[0]=a;
 300    zcer[0]=z;
 301    gMC->Gfmate((*fIdmate)[4], namate, a, z, d, radl, absl, buf, nbuf);
 302    acer[1]=a;
 303    zcer[1]=z;
 304
 305    AliMixture( 9, "Ceramic    $", acer, zcer, denscer, 2, wcer);
 306    AliMixture( 5, "Scintillator$",ascin,zscin,denscin,-2,wscin);
 307    AliMixture( 6, "Brass    $", abrass, zbrass, denbrass, 2, wbrass);
 308
 309    AliMixture( 7, "Ribber $",aribber,zribber,denribber,-3,wribber);
 310    AliMixture( 8, "Lucite$",alucite,zlucite,denlucite,-3,wlucite);
 311
 312
 313    AliMedium(1, "START Air$", 2, 0, isxfld, sxmgmx, 10., .1, 1., .003, .003);
 314    AliMedium(2, "Scintillator$", 5, 1, isxfld, sxmgmx, 10., .01, 1., .003, .003);
 315    AliMedium(3, "Vacuum$", 1, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 316    AliMedium(4, "Ceramic$", 9, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 317    AliMedium(6, "Glass$", 4, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 318    AliMedium(8, "Steel$", 0, 0, isxfld, sxmgmx, 1., .001, 1., .001, .001);
 319    AliMedium(9, "Ribber  $", 7, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 320    AliMedium(11, "Brass  $", 6, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
 321    AliMedium(12, "Lucite$", 8, 1, isxfld, sxmgmx, 10., .01, 1., .003, .003);
 322
 323    if(fDebug) cout<<ClassName()<<": ++++++++++++++Medium set++++++++++"<<endl;
 324
 325 //  geant3->Gsckov(idtmed[2105], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 326
 327 }
 328 //---------------------------------------------------------------------
 329 void AliSTARTv1::DrawDetector()
 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("0ST","SEEN",0);
 340   gMC->Gsatt("0INS","SEEN",0);
 341   gMC->Gsatt("0PMT","SEEN",1);
 342   gMC->Gsatt("0DIV","SEEN",1);
 343   //
 344   gMC->Gdopt("hide","on");
 345   gMC->Gdopt("shad","on");
 346   gMC->SetClipBox(".");
 347   gMC->SetClipBox("*",0,1000,-1000,1000,-1000,1000);
 348   gMC->DefaultRange();
 349   gMC->Gdraw("alic",40,30,0,12,9.5,.7,0.7);
 350   gMC->Gdhead(1111,"T-Zero detector");
 351   gMC->Gdopt("hide","off");
 352 }
 353
 354 //-------------------------------------------------------------------
 355 void AliSTARTv1::Init()
 356 {
 357 // Initialises version 0 of the Forward Multiplicity Detector
 358 //
 359 //Int_t *idtmed  = gAlice->Idtmed();
 360   AliSTART::Init();
 361   fIdSens1=gMC->VolId("0TOP");
 362   if(fDebug) printf("%s: *** START version 0 initialized ***\n",ClassName());
 363
 364 }
 365
 366 //-------------------------------------------------------------------
 367
 368 void AliSTARTv1::StepManager()
 369 {
 370   //
 371   // Called for every step in the START Detector
 372   //
 373   Int_t id,copy,copy1;
 374   static Float_t hits[7];
 375   static Float_t edep;
 376   static Int_t vol[2];
 377   TLorentzVector pos;
 378
 379   TClonesArray &lhits = *fHits;
 380
 381   if(!gMC->IsTrackAlive()) return; // particle has disappeared
 382   //  Float_t charge = gMC->TrackCharge();
 383   //  if(TMath::Abs(charge)<=0.) return; //take only charged particles
 384   id=gMC->CurrentVolID(copy);
 385
 386
 387    // Check the sensetive volume
 388   if(id==fIdSens1 ) {
 389     if(gMC->IsTrackEntering()) {
 390       gMC->CurrentVolOffID(2,copy);
 391       vol[1]=copy;
 392       gMC->CurrentVolOffID(3,copy1);
 393       vol[0]=copy1;
 394
 395       gMC->TrackPosition(pos);
 396       hits[0] = pos[0];
 397       hits[1] = pos[1];
 398       hits[2] = pos[2];
 399       if(pos[2]<0) vol[0]=2;
 400       if(pos[2]>=0) vol[0]=1;
 401
 402       Float_t etot=gMC->Etot();
 403       hits[4]=etot;
 404       Int_t iPart= gMC->TrackPid();
 405       Int_t partID=gMC->IdFromPDG(iPart);
 406       hits[5]=partID;
 407       Float_t ttime=gMC->TrackTime();
 408       hits[6]=ttime*1e9;
 409       edep=0;
 410     }
 411     if(gMC->IsTrackInside())    {
 412       Float_t de=gMC->Edep();
 413       edep=edep+de;
 414     }
 415
 416     if(gMC->IsTrackExiting())   {
 417       Float_t de=gMC->Edep();
 418       edep=edep+de;
 419       hits[3]=edep*1e3;
 420       new(lhits[fNhits++]) AliSTARThit(fIshunt,gAlice->CurrentTrack(),vol,hits);
 421     }
 422   }
 423 //---------------------------------------------------------------------
 424 }
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