PHOS/AliPHOSEMCAGeometry.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 /* $Id$ */
  17
  18 //_________________________________________________________________________
  19 // Geometry class  for PHOS : EMCA (Electromagnetic Calorimeter)
  20 // Its data members provide geometry parametrization of EMCA
  21 // which can be changed in the constructor only.
  22 // Author   : Yves Schutz (SUBATECH)
  23 // Modified : Yuri Kharlov (IHEP, Protvino)
  24 // 13 September 2000
  25 // Modified : Dmitri Peressounko (RRC "Kurchatov Institute")
  26 // 6 August 2001
  27
  28 // --- AliRoot header files ---
  29
  30 #include "AliPHOSEMCAGeometry.h"
  31
  32 ClassImp(AliPHOSEMCAGeometry)
  33
  34 //____________________________________________________________________________
  35 AliPHOSEMCAGeometry::AliPHOSEMCAGeometry():
  36                      fAirGapLed(0.f),
  37                      fStripWallWidthOut(0.f),
  38                      fStripWallWidthIn(0.f),
  39                      fTyvecThickness(0.f),
  40                      fInnerThermoWidthX(0.f),
  41                      fInnerThermoWidthY(0.f),
  42                      fInnerThermoWidthZ(0.f),
  43                      fAirGapWidthX(0.f),
  44                      fAirGapWidthY(0.f),
  45                      fAirGapWidthZ(0.f),
  46                      fCoolerWidthX(0.f),
  47                      fCoolerWidthY(0.f),
  48                      fCoolerWidthZ(0.f),
  49                      fAlCoverThickness(0.f),
  50                      fOuterThermoWidthXUp(0.f),
  51                      fOuterThermoWidthXLow(0.f),
  52                      fOuterThermoWidthY(0.f),
  53                      fOuterThermoWidthZ(0.f),
  54                      fAlFrontCoverX(0.f),
  55                      fAlFrontCoverZ(0.f),
  56                      fFiberGlassSup2X(0.f),
  57                      fFiberGlassSup1X(0.f),
  58                      fFrameHeight(0.f),
  59                      fFrameThickness(0.f),
  60                      fAirSpaceFeeX(0.f),
  61                      fAirSpaceFeeZ(0.f),
  62                      fAirSpaceFeeY(0.f),
  63                      fWarmUpperThickness(0.f),
  64                      fWarmBottomThickness(0.f),
  65                      fWarmAlCoverWidthX(0.f),
  66                      fWarmAlCoverWidthY(0.f),
  67                      fWarmAlCoverWidthZ(0.f),
  68                      fFiberGlassSup1Y(0.f),
  69                      fFiberGlassSup2Y(0.f),
  70                      fTSupportDist(0.f),
  71                      fTSupport1Thickness(0.f),
  72                      fTSupport2Thickness(0.f),
  73                      fTSupport1Width(0.f),
  74                      fTSupport2Width(0.f),
  75                      fIPtoOuterCoverDistance(0.f),
  76                      fIPtoCrystalSurface(0.f),
  77                      fSupportPlateThickness(0.f),
  78                      fNCellsInStrip(0),
  79                      fNStripX(0),
  80                      fNStripZ(0),
  81                      fNTSupports(0),
  82                      fNPhi(0),
  83                      fNZ(0)
  84 {
  85
  86
  87   // Initializes the EMC parameters
  88   // Coordinate system chosen: x across beam, z along beam, y out of beam.
  89   // Reference point for all volumes incide module is
  90   // center of module in x,z on the upper surface of support beam
  91
  92   //Distance from IP to surface of the crystals
  93   fIPtoCrystalSurface     = 460.0 ;
  94
  95
  96   //CRYSTAL
  97
  98   fCrystalHalfSize[0] =  2.2 /2 ;  //Half-Sizes of crystall
  99   fCrystalHalfSize[1] = 18.0 /2 ;
 100   fCrystalHalfSize[2] =  2.2 /2 ;
 101
 102   //APD + preamplifier
 103
 104   //fPinDiodeSize[0] = 1.71 ;   //Values of ame PIN diode
 105   //fPinDiodeSize[1] = 0.0280 ; // OHO 0.0280 is the depth of active layer
 106   //fPinDiodeSize[2] = 1.61 ;
 107
 108   fPinDiodeHalfSize[0] = 0.5000 /2 ;    // APD 5 mm side
 109   fPinDiodeHalfSize[1] = 0.0100 /2 ;    // APD bulk thickness
 110   fPinDiodeHalfSize[2] = 0.5000 /2 ;    // APD 5 mm side
 111
 112   fPreampHalfSize[0] = 1.5 / 2 ;       // Preamplifier
 113   fPreampHalfSize[1] = 0.5 / 2 ;
 114   fPreampHalfSize[2] = 1.5 / 2 ;
 115
 116   //STRIP
 117
 118   fNCellsInStrip = 8 ;     //Number of crystals in strip
 119   fNStripX = 8 ;           //Number of strips acros beam
 120   fNStripZ = 56 ;          //Number of strips along beam
 121
 122   fStripWallWidthOut = 0.01 ;     // Side to another strip
 123   fStripWallWidthIn  = 0.02 ;     // Side betveen crystals in one strip
 124
 125   fTyvecThickness = 0.01 ;        //Thickness of the tyvec
 126
 127   fAirGapLed = 1.5 - 2 * fPreampHalfSize[1] - 2 * fPinDiodeHalfSize[1] ; // Air gap before crystalls for LED system
 128                                            // Note, that Cell in Strip 1.5 longer then crystall
 129
 130   //---Now calculate thechnical sizes for GEANT implementation
 131
 132   fWrappedHalfSize[0] = (2*fTyvecThickness + 2*fCrystalHalfSize[0])/2 ;   //This will be size of crystall
 133   fWrappedHalfSize[1] = fCrystalHalfSize[1] ;                             //wrapped into tyvec
 134   fWrappedHalfSize[2] = (2*fTyvecThickness + 2*fCrystalHalfSize[2])/2 ;   //
 135
 136   fAirCellHalfSize[0] = fWrappedHalfSize[0] ;                     //This is HALF-size of one cell
 137   fAirCellHalfSize[1] = (fAirGapLed + 2*fPreampHalfSize[1] +
 138                          2*fPinDiodeHalfSize[1] + 2*fWrappedHalfSize[1])/2 ;  //in strip
 139   fAirCellHalfSize[2] = fWrappedHalfSize[2]  ;                    //
 140
 141   fSupportPlateHalfSize[0] = ( (fNCellsInStrip-1)*fStripWallWidthIn + 2* fStripWallWidthOut +
 142                   fNCellsInStrip * (2 * fTyvecThickness + 2*fCrystalHalfSize[0]) )/2 ;
 143   fSupportPlateHalfSize[1] =  6.0  /2 ;
 144   fSupportPlateHalfSize[2] =  ( 2 * fTyvecThickness + 2*fCrystalHalfSize[0] + 2*fStripWallWidthOut )/2 ;
 145
 146   fSupportPlateThickness = 0.3 ;
 147   fSupportPlateInHalfSize[0] = fSupportPlateHalfSize[0] ;                         //Half-sizes of the air
 148   fSupportPlateInHalfSize[1] = fSupportPlateHalfSize[1]-fSupportPlateThickness ;  //box in the support plate
 149   fSupportPlateInHalfSize[2] = fSupportPlateHalfSize[2]-fSupportPlateThickness/2 ;
 150
 151   fStripHalfSize[0]= fSupportPlateHalfSize[0] ;
 152   fStripHalfSize[1]= ( 2*fSupportPlateHalfSize[1] + 2*fAirCellHalfSize[1] )/2;
 153   fStripHalfSize[2]= fSupportPlateHalfSize[2] ;
 154
 155   // ------- Inner hermoinsulation ---------------
 156   fInnerThermoWidthX = 2.0 ;         // Width of the innerthermoinsulation across the beam
 157   fInnerThermoWidthY = 2.0 ;         // Width of the upper cover of innerthermoinsulation
 158   fInnerThermoWidthZ = 2.0 ;         // Width of the innerthermoinsulation along the beam
 159
 160   fInnerThermoHalfSize[0] = (2 * fStripHalfSize[0] * fNStripX + 2 * fInnerThermoWidthX ) /2 ;
 161   fInnerThermoHalfSize[1] = (2 * fStripHalfSize[1] + fInnerThermoWidthY ) /2 ;
 162   fInnerThermoHalfSize[2] = (2 * fStripHalfSize[2] * fNStripZ + 2 * fInnerThermoWidthZ ) /2 ;
 163
 164   // ------- Air gap between inner thermoinsulation and passive coller ---------
 165
 166   fAirGapWidthX = 0.2 ;         // Width of the air gap across the beam
 167   fAirGapWidthY = 0.2 ;         // Width of the upper air gap
 168   fAirGapWidthZ = 0.2 ;         // Width of the air gap along the beam
 169
 170   fAirGapHalfSize[0] = (2 * fInnerThermoHalfSize[0] + 2 * fAirGapWidthX ) /2 ;
 171   fAirGapHalfSize[1] = (2 * fInnerThermoHalfSize[1] +     fAirGapWidthY ) /2 ;
 172   fAirGapHalfSize[2] = (2 * fInnerThermoHalfSize[2] + 2 * fAirGapWidthZ ) /2 ;
 173
 174   // ------- Passive Cooler ------------------------
 175
 176   fCoolerWidthX = 2.0 ;         // Width of the passive coller across the beam
 177   fCoolerWidthY = 0.3 ;         // Width of the upper cover of cooler
 178   fCoolerWidthZ = 2.0 ;         // Width of the passive cooler along the beam
 179
 180   fCoolerHalfSize[0] = (2 * fAirGapHalfSize[0] + 2 * fCoolerWidthX ) /2 ;
 181   fCoolerHalfSize[1] = (2 * fAirGapHalfSize[1] +     fCoolerWidthY ) /2 ;
 182   fCoolerHalfSize[2] = (2 * fAirGapHalfSize[2] + 2 * fCoolerWidthZ ) /2 ;
 183
 184   // ------- Outer thermoinsulation and Al cover -------------------------------
 185
 186   fAlCoverThickness = 0.1 ;   //Thickness of the Al cover of the module
 187
 188   fOuterThermoWidthXUp  = 156.0 - fAlCoverThickness ;
 189                                   //width of the upper surface of the PHOS module accross the beam
 190   fOuterThermoWidthY    = 6.0 ;   // with of the upper cover of outer thermoinsulation
 191   fOuterThermoWidthZ    = 6.0 ;   //width of the thermoinsulation along the beam
 192
 193   fAlFrontCoverX = 6.0 ;   //Width of Al strip around fiberglass window: across
 194   fAlFrontCoverZ = 6.0 ;   //and along the beam
 195
 196
 197   // Calculate distance from IP to upper cover
 198   fIPtoOuterCoverDistance = fIPtoCrystalSurface - fAirGapLed - fInnerThermoWidthY - fAirGapWidthY -
 199                             fCoolerWidthY - fOuterThermoWidthY - fAlCoverThickness ;
 200
 201   Float_t tanA = fOuterThermoWidthXUp / (2.*fIPtoOuterCoverDistance) ;
 202                   // tan(a) where A = angle between IP to center and IP to side across beam
 203
 204   fOuterThermoWidthXLow = fOuterThermoWidthXUp +
 205                           2 * (2* fCoolerHalfSize[1] + fOuterThermoWidthY) * tanA
 206                           - fAlCoverThickness ;
 207                           //width of the lower surface of the COOL section accross the beam
 208
 209
 210   fOuterThermoParams[0] = fOuterThermoWidthXUp / 2 ;   // half-length along x at the z surface positioned at -DZ;
 211   fOuterThermoParams[1] = fOuterThermoWidthXLow/ 2 ;   // half-length along x at the z surface positioned at +DZ;
 212   fOuterThermoParams[2] = ( 2 * fCoolerHalfSize[2] + 2 * fOuterThermoWidthZ ) / 2 ;
 213                                                        // `half-length along the y-axis' in out case this is z axis
 214   fOuterThermoParams[3] = ( 2* fCoolerHalfSize[1] + fOuterThermoWidthY) /2 ;
 215                                                        // `half-length along the z-axis' in our case this is y axis
 216
 217   fAlCoverParams[0] = fOuterThermoParams[0] + fAlCoverThickness ;
 218   fAlCoverParams[1] = fOuterThermoParams[1] + fAlCoverThickness ;
 219   fAlCoverParams[2] = fOuterThermoParams[2] + fAlCoverThickness ;
 220   fAlCoverParams[3] = fOuterThermoParams[3] + fAlCoverThickness /2 ;
 221
 222
 223   fFiberGlassHalfSize[0] = fAlCoverParams[0] - fAlFrontCoverX  ;
 224   fFiberGlassHalfSize[1] = fAlCoverParams[2] - fAlFrontCoverZ  ; //Note, here other ref. system
 225   fFiberGlassHalfSize[2] = fAlCoverThickness / 2 ;
 226
 227
 228   //============Now warm section======================
 229   //Al Cover
 230   fWarmAlCoverWidthX = 2 * fAlCoverParams[1] ;  //Across beam
 231   fWarmAlCoverWidthY = 159.0 ;                  //along beam
 232
 233   //T-support
 234   fTSupport1Thickness = 3.5 ;
 235   fTSupport2Thickness = 5.0 ;
 236   fTSupport1Width =  10.6 ;
 237   fTSupport2Width = 3.1 ;
 238   fNTSupports = fNStripX + 1 ;
 239   fTSupportDist = 7.48 ;
 240
 241   //Air space for FEE
 242   fAirSpaceFeeX = 148.6 ;   //Across beam
 243   fAirSpaceFeeY = 135.0 ;   //along beam
 244   fAirSpaceFeeZ =  19.0 ;   //out of beam
 245
 246   //thermoinsulation
 247   fWarmBottomThickness = 4.0 ;
 248   fWarmUpperThickness  = 4.0 ;
 249
 250   //Frame
 251   fFrameThickness = 5.0 ;
 252   fFrameHeight    = 15.0 ;
 253
 254   //Fiberglass support
 255   fFiberGlassSup1X = 6.0 ;
 256   fFiberGlassSup1Y = 4.0 + fWarmUpperThickness ;
 257
 258   fFiberGlassSup2X = 3.0 ;
 259   fFiberGlassSup2Y = fFrameHeight ;
 260
 261   //Now calculate Half-sizes
 262
 263   fWarmAlCoverWidthZ = fAirSpaceFeeZ + fWarmBottomThickness + fWarmUpperThickness +
 264                        fTSupport1Thickness + fTSupport2Thickness ;
 265
 266
 267   fWarmAlCoverHalfSize[0] = fWarmAlCoverWidthX / 2 ;
 268   fWarmAlCoverHalfSize[1] = fWarmAlCoverWidthY / 2 ;
 269   fWarmAlCoverHalfSize[2] = fWarmAlCoverWidthZ / 2 ;
 270
 271
 272   fWarmThermoHalfSize[0] = fWarmAlCoverHalfSize[0] - fAlCoverThickness ;
 273   fWarmThermoHalfSize[1] = fWarmAlCoverHalfSize[1] - fAlCoverThickness ;
 274   fWarmThermoHalfSize[2] = fWarmAlCoverHalfSize[2] - fAlCoverThickness /2 ;
 275
 276
 277   //T-support
 278   fTSupport1HalfSize[0] =  fTSupport1Width /2 ;   //Across beam
 279   fTSupport1HalfSize[1] =  (fAirSpaceFeeY + 2*fFiberGlassSup1X) /2 ;    //along beam
 280   fTSupport1HalfSize[2] =  fTSupport1Thickness  /2;    //out of beam
 281
 282   fTSupport2HalfSize[0] = fTSupport2Width /2;               //Across beam
 283   fTSupport2HalfSize[1] = fTSupport1HalfSize[1] ; //along beam
 284   fTSupport2HalfSize[2] = fTSupport2Thickness /2; //out of beam
 285
 286   //cables
 287   fTCables1HalfSize[0] = (2*fTSupport1HalfSize[0]*fNTSupports + (fNTSupports-1)* fTSupportDist) / 2 ; //Across beam
 288   fTCables1HalfSize[1] = fTSupport1HalfSize[1] ;    //along beam
 289   fTCables1HalfSize[2] = fTSupport1HalfSize[2] ;    //out of beam
 290
 291   fTCables2HalfSize[0] = fTCables1HalfSize[0]  ; //Across beam
 292   fTCables2HalfSize[1] = fTSupport2HalfSize[1] ; //along beam
 293   fTCables2HalfSize[2] = fTSupport2HalfSize[2] ; //out of beam
 294
 295   //frame: we define two frames along beam ...Z and across beam ...X
 296   fFrameXHalfSize[0] = (fAirSpaceFeeX + 2 * fFiberGlassSup2X + 2* fFrameThickness) /2 ;
 297   fFrameXHalfSize[1] = fFrameThickness /2 ;
 298   fFrameXHalfSize[2] = fFrameHeight    /2 ;
 299
 300   fFrameXPosition[0] = 0 ;
 301   fFrameXPosition[1] = fAirSpaceFeeY /2 + fFiberGlassSup2X + fFrameXHalfSize[1] ;
 302   fFrameXPosition[2] = fWarmThermoHalfSize[2] - fFrameHeight/ 2 - fWarmBottomThickness ;
 303
 304   fFrameZHalfSize[0] = fFrameThickness /2 ;
 305   fFrameZHalfSize[1] = (fAirSpaceFeeY + 2 * fFiberGlassSup2X) /2 ;
 306   fFrameZHalfSize[2] = fFrameHeight    /2 ;
 307
 308   fFrameZPosition[0] = fAirSpaceFeeX /2 + fFiberGlassSup2X + fFrameZHalfSize[0] ;
 309   fFrameZPosition[1] = 0 ;
 310   fFrameZPosition[2] = fWarmThermoHalfSize[2] - fFrameHeight/ 2 - fWarmBottomThickness ;
 311
 312   //Fiberglass support define 4 fiber glass supports 2 along Z  and 2 along X
 313
 314   fFGupXHalfSize[0] = fFrameXHalfSize[0] ;
 315   fFGupXHalfSize[1] = fFiberGlassSup1X /2 ;
 316   fFGupXHalfSize[2] = fFiberGlassSup1Y /2;
 317
 318   fFGupXPosition[0] = 0 ;
 319   fFGupXPosition[1] = fAirSpaceFeeY /2 + fFGupXHalfSize[1] ;
 320   fFGupXPosition[2] = fWarmThermoHalfSize[2] - fFrameHeight - fWarmBottomThickness - fFGupXHalfSize[2] ;
 321
 322   fFGupZHalfSize[0] = fFiberGlassSup1X /2 ;
 323   fFGupZHalfSize[1] = fAirSpaceFeeY /2 ;
 324   fFGupZHalfSize[2] = fFiberGlassSup1Y /2;
 325
 326   fFGupZPosition[0] = fAirSpaceFeeX /2 + fFGupZHalfSize[0] ;
 327   fFGupZPosition[1] = 0 ;
 328   fFGupZPosition[2] = fWarmThermoHalfSize[2] - fFrameHeight - fWarmBottomThickness - fFGupXHalfSize[2] ;
 329
 330   fFGlowXHalfSize[0] = fFrameXHalfSize[0] - 2*fFrameZHalfSize[0] ;
 331   fFGlowXHalfSize[1] = fFiberGlassSup2X /2 ;
 332   fFGlowXHalfSize[2] = fFrameXHalfSize[2] ;
 333
 334   fFGlowXPosition[0] = 0 ;
 335   fFGlowXPosition[1] = fAirSpaceFeeY /2 + fFGlowXHalfSize[1] ;
 336   fFGlowXPosition[2] = fWarmThermoHalfSize[2] - fWarmBottomThickness - fFGlowXHalfSize[2] ;
 337
 338   fFGlowZHalfSize[0] = fFiberGlassSup2X /2 ;
 339   fFGlowZHalfSize[1] = fAirSpaceFeeY /2 ;
 340   fFGlowZHalfSize[2] = fFrameZHalfSize[2] ;
 341
 342   fFGlowZPosition[0] = fAirSpaceFeeX /2 + fFGlowZHalfSize[0] ;
 343   fFGlowZPosition[1] = 0 ;
 344   fFGlowZPosition[2] = fWarmThermoHalfSize[2] - fWarmBottomThickness - fFGlowXHalfSize[2] ;
 345
 346
 347   // --- Air Gap for FEE ----
 348
 349   fFEEAirHalfSize[0] =  fAirSpaceFeeX /2 ;
 350   fFEEAirHalfSize[1] =  fAirSpaceFeeY /2;
 351   fFEEAirHalfSize[2] =  fAirSpaceFeeZ /2;
 352
 353   fFEEAirPosition[0] = 0 ;
 354   fFEEAirPosition[1] = 0 ;
 355   fFEEAirPosition[2] = fWarmThermoHalfSize[2] - fWarmBottomThickness - fFEEAirHalfSize[2] ;
 356
 357   // --- Calculate the oveol dimentions of the EMC module
 358
 359   fEMCParams[3] = fAlCoverParams[3] + fWarmAlCoverHalfSize[2] ; //Size out of beam
 360   fEMCParams[0] = fAlCoverParams[0] ; //Upper size across the beam
 361   fEMCParams[1] = (fAlCoverParams[1] - fAlCoverParams[0])*fEMCParams[3]/fAlCoverParams[3]
 362                  + fAlCoverParams[0]  ; //Lower size across the beam
 363   fEMCParams[2] = fWarmAlCoverHalfSize[1] ;                     // Size along the beam
 364
 365   fNPhi = fNStripX * fNCellsInStrip ;    //Number of crystalls across beam
 366   fNZ   = fNStripZ ;                     //number of crystals along beam
 367 }
 368