FMD/AliFMD3.cxx

   1 /**************************************************************************
   2  * Copyright(c) 2004, 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 //
  20 // Concrete implementation of AliFMDSubDetector
  21 //
  22 // This implements the geometry for FMD3
  23 //
  24 #include "TVirtualMC.h"         // ROOT_TVirtualMC
  25 #include "TCONS.h"              // ROOT_TCONS
  26 #include "TNode.h"              // ROOT_TNode
  27 #include "TList.h"              // ROOT_TList
  28 #include "AliFMD3.h"            // ALIFMD3_H
  29 #include "AliLog.h"             // ALILOG_H
  30 #include "AliFMDRing.h"         // ALIFMDRING_H
  31 #include <Riostream.h>          // ROOT_Riostream
  32
  33 //____________________________________________________________________
  34 ClassImp(AliFMD3);
  35
  36 //____________________________________________________________________
  37 AliFMD3::AliFMD3()
  38   : AliFMDSubDetector(3),
  39     fVolumeId(0)
  40 {
  41   // Default constructor for the FMD3 sub-detector
  42 }
  43
  44
  45 //____________________________________________________________________
  46 AliFMD3::~AliFMD3()
  47 {
  48   // Destructor - does nothing
  49 }
  50
  51
  52 //____________________________________________________________________
  53 void
  54 AliFMD3::SetupGeometry(Int_t airId, Int_t alId, Int_t carbonId)
  55 {
  56   // Setup the FMD3 sub-detector geometry
  57   //
  58   // Parameters:
  59   //
  60   //     airId         Id # of the Air medium
  61   //     kaptionId     Id # of the Aluminium medium
  62   //
  63   Double_t innerZl = fInnerZ;
  64   Double_t innerZh = (fInnerZ
  65                       - fInner->GetModuleSpacing()
  66                       - fInner->GetLegLength()
  67                       - fInner->GetSiThickness()
  68                       - fInner->GetPrintboardThickness()
  69                       - fHoneycombThickness);
  70   Double_t innerRl = fInner->GetLowR();
  71   Double_t outerZl = fOuterZ;
  72   Double_t outerZh = (fOuterZ
  73                       - fOuter->GetModuleSpacing()
  74                       - fOuter->GetLegLength()
  75                       - fOuter->GetSiThickness()
  76                       - fOuter->GetPrintboardThickness()
  77                       - fHoneycombThickness);
  78   Double_t outerRl = fOuter->GetLowR();
  79
  80   fSupport.SetupGeometry(airId, carbonId,
  81                          innerZl, innerZh, innerRl,
  82                          outerZl, outerZh, outerRl);
  83
  84   fInnerHoneyLowR  = fInner->GetLowR() + 1;
  85   fInnerHoneyHighR = fSupport.ConeR(innerZh + fHoneycombThickness, "I");
  86   fOuterHoneyLowR  = fOuter->GetLowR() + 1;
  87   fOuterHoneyHighR = fSupport.GetBackLowR();
  88
  89   // Identity matrix
  90   gMC->Matrix(fRotationId, 90, 0, 90, 90, 0, 0);
  91   //0, 180, 90, 90, 180, 0);
  92
  93   AliFMDSubDetector::SetupGeometry(airId, alId, carbonId);
  94 }
  95
  96 //____________________________________________________________________
  97 void
  98 AliFMD3::Geometry(const char* mother, Int_t pbRotId,
  99                   Int_t idRotId, Double_t z)
 100 {
 101   // Position the FMD3 sub-detector volume
 102   //
 103   // Parameters
 104   //
 105   //     mother     name of the mother volume
 106   //     pbRotId    Printboard roation matrix ID
 107   //     idRotId    Identity rotation matrix ID
 108   //     z          Z position (not really used here, but passed down)
 109   //
 110   z = fSupport.GetZ();
 111   AliDebug(10, Form("Passing z=%lf to ring volumes", z));
 112   AliFMDSubDetector::Geometry("FMD3", pbRotId, idRotId, z);
 113   fSupport.Geometry(mother, fRotationId, z);
 114 }
 115
 116
 117 //____________________________________________________________________
 118 void
 119 AliFMD3::SimpleGeometry(TList* nodes,
 120                         TNode* mother,
 121                         Int_t colour,
 122                         Double_t zMother)
 123 {
 124   // We need to get the equation for the line that connects the
 125   // outer circumfrences of the two rings, as  well as for the line
 126   // that connects the inner curcumfrences, so that we can project to
 127   // where the honey-comb actually ends.
 128   //
 129   // we have
 130   //
 131   //   y = a * x + b
 132   //   b = y - a * x;
 133   //
 134   // For the outer line, we have the two equations
 135   //
 136   //    fOuterHoneyHighR = a * x1 + b;
 137   //    fInnerHoneyHighR = a * x2 + b;
 138   //
 139   // where
 140   //
 141   //    x1 = (fOuterZ + fOuter->fSiThickness + fOuter->fPrintboardThickness
 142   //          + fOuter->fLegLength + fModuleSpacing)
 143   //       = fInner - fDz + fHoneycombThickness
 144   //    x2 = (fInnerZ + fInner->fSiThickness + fInner->fPrintboardThickness
 145   //          + fInner->fLegLength + fModuleSpacing)
 146   //
 147   // and
 148   //
 149   //    a  = (fOuterHoneyHighR - fInnerHoneyHighR) / (x1 - x2)
 150   //
 151   //
 152   Double_t dz = (TMath::Abs(fInnerZ - fOuterZ)
 153                  + fOuter->GetSiThickness()
 154                  + fOuter->GetPrintboardThickness()
 155                  + fOuter->GetLegLength()
 156                  + fOuter->GetModuleSpacing()
 157                  + fHoneycombThickness) / 2;
 158 #if 1
 159   Double_t x1  = (fOuterZ - (fOuter->GetSiThickness()
 160                              + fOuter->GetPrintboardThickness()
 161                              + fOuter->GetLegLength()
 162                              + fOuter->GetModuleSpacing()));
 163   Double_t x2  = (fInnerZ - (fInner->GetSiThickness()
 164                              + fInner->GetPrintboardThickness()
 165                              + fInner->GetLegLength()
 166                              + fInner->GetModuleSpacing()));
 167   Double_t ao   = 0;
 168   Double_t ao1  = (fOuterHoneyHighR - fInnerHoneyHighR) / (x1 - x2);
 169   Double_t ao2  = ((fOuter->GetHighR() - fInner->GetHighR())
 170                    / (fOuterZ - fInnerZ));
 171   Double_t bo   = 0;
 172   if (ao2 > ao1) {
 173     // std::cout << "Wafer determinds the size" << std::endl;
 174     ao  = ao2;
 175     bo  = fInner->GetHighR() - ao * fInnerZ;
 176   }
 177   else {
 178     ao = ao1;
 179     bo = fOuterHoneyHighR - ao * x1;
 180   }
 181
 182   Double_t y1o = ao * (fInnerZ - 2 * dz) + bo;
 183   Double_t y2o = ao * fInnerZ + bo;
 184 #endif
 185   // We probably need to make a PCON here.
 186   TShape* shape = new TCONS("FMD3", "FMD3", "", dz,
 187                             fOuter->GetLowR(),  y1o, /* fOuterHoneyHighR, */
 188                             fInner->GetLowR(),  y2o, /* fInnerHoneyHighR, */
 189                             0, 360);
 190   mother->cd();
 191   zMother = fInnerZ - dz;
 192   TNode* node = new TNode("FMD3", "FMD3", shape, 0, 0, zMother, 0);
 193   node->SetVisibility(0);
 194   nodes->Add(node);
 195   AliFMDSubDetector::SimpleGeometry(nodes, node, colour, zMother);
 196 }
 197
 198 //____________________________________________________________________
 199 void
 200 AliFMD3::Gsatt()
 201 {
 202   AliFMDSubDetector::Gsatt();
 203   fSupport.Gsatt();
 204 }
 205
 206 //____________________________________________________________________
 207 //
 208 // EOF
 209 //