[u/mrichter/AliRoot.git] / TRD / AliTRDgeometry.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  TRD geometry class                                                       //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////


#include <TError.h>

#include "AliRunLoader.h"
#include "AliTRDgeometry.h"
#include "AliTRDparameter.h"

ClassImp(AliTRDgeometry)

//_____________________________________________________________________________

  //
  // The geometry constants
  //
  const Int_t   AliTRDgeometry::fgkNsect   = kNsect;
  const Int_t   AliTRDgeometry::fgkNplan   = kNplan;
  const Int_t   AliTRDgeometry::fgkNcham   = kNcham;
  const Int_t   AliTRDgeometry::fgkNdet    = kNdet;

  //
  // Dimensions of the detector
  //

  // Inner and outer radius of the mother volumes 
  const Float_t AliTRDgeometry::fgkRmin    = 294.0;
  const Float_t AliTRDgeometry::fgkRmax    = 368.0;

  // Upper and lower length of the mother volumes 
  const Float_t AliTRDgeometry::fgkZmax1   = 378.35; 
  const Float_t AliTRDgeometry::fgkZmax2   = 302.0; 

  // Parameter of the BTR mother volumes 
  const Float_t AliTRDgeometry::fgkSheight =  74.0; 
  const Float_t AliTRDgeometry::fgkSwidth1 =  99.613;
  const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
  const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
  const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5; 
  const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;  

  // The super module side plates
  const Float_t AliTRDgeometry::fgkSMpltT  = 0.2;
  const Float_t AliTRDgeometry::fgkSMgapT  = 0.5;  

  // Height of different chamber parts
  // Radiator
  const Float_t AliTRDgeometry::fgkCraH    =   4.8; 
  // Drift region
  const Float_t AliTRDgeometry::fgkCdrH    =   3.0;
  // Amplification region
  const Float_t AliTRDgeometry::fgkCamH    =   0.7;
  // Readout
  const Float_t AliTRDgeometry::fgkCroH    =   2.316;
  // Total height
  const Float_t AliTRDgeometry::fgkCH      = AliTRDgeometry::fgkCraH
                                           + AliTRDgeometry::fgkCdrH
                                           + AliTRDgeometry::fgkCamH
                                           + AliTRDgeometry::fgkCroH;  

  // Vertical spacing of the chambers
  const Float_t AliTRDgeometry::fgkVspace  =   1.784;

  // Horizontal spacing of the chambers
  const Float_t AliTRDgeometry::fgkHspace  =   2.0;

  // Thicknesses of different parts of the chamber frame
  // Lower aluminum frame
  const Float_t AliTRDgeometry::fgkCalT    =   0.3;
  // Lower G10 frame sides
  const Float_t AliTRDgeometry::fgkCclsT   =   0.3;
  // Lower G10 frame front
  const Float_t AliTRDgeometry::fgkCclfT   =   1.0;
  // Upper G10 frame
  const Float_t AliTRDgeometry::fgkCcuT    =   0.9;
  // Upper Al frame
  const Float_t AliTRDgeometry::fgkCauT    =   1.5;

  // Additional width of the readout chamber frames
  const Float_t AliTRDgeometry::fgkCroW    =   0.9;

  // Difference of outer chamber width and pad plane width
  //const Float_t AliTRDgeometry::fgkCpadW   =   1.0;
  const Float_t AliTRDgeometry::fgkCpadW   =   0.0;
  const Float_t AliTRDgeometry::fgkRpadW   =   1.0;

  //
  // Thickness of the the material layers
  //
  const Float_t AliTRDgeometry::fgkRaThick = 0.3646;  
  const Float_t AliTRDgeometry::fgkMyThick = 0.005;
  const Float_t AliTRDgeometry::fgkDrThick = AliTRDgeometry::fgkCdrH;    
  const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkCamH;
  const Float_t AliTRDgeometry::fgkXeThick = AliTRDgeometry::fgkDrThick
                                           + AliTRDgeometry::fgkAmThick;
  const Float_t AliTRDgeometry::fgkCuThick = 0.001; 
  const Float_t AliTRDgeometry::fgkSuThick = 0.06; 
  const Float_t AliTRDgeometry::fgkFeThick = 0.0044; 
  const Float_t AliTRDgeometry::fgkCoThick = 0.02;
  const Float_t AliTRDgeometry::fgkWaThick = 0.02;

  //
  // Position of the material layers
  //
  const Float_t AliTRDgeometry::fgkRaZpos  = -1.50;
  const Float_t AliTRDgeometry::fgkMyZpos  =  0.895;
  const Float_t AliTRDgeometry::fgkDrZpos  =  2.4;
  const Float_t AliTRDgeometry::fgkAmZpos  =  0.0;
  const Float_t AliTRDgeometry::fgkCuZpos  = -0.9995;
  const Float_t AliTRDgeometry::fgkSuZpos  =  0.0000;
  const Float_t AliTRDgeometry::fgkFeZpos  =  0.0322;
  const Float_t AliTRDgeometry::fgkCoZpos  =  0.97;
  const Float_t AliTRDgeometry::fgkWaZpos  =  0.99;

//_____________________________________________________________________________
AliTRDgeometry::AliTRDgeometry():AliGeometry()
{
  //
  // AliTRDgeometry default constructor
  //

  Init();

}

//_____________________________________________________________________________
AliTRDgeometry::~AliTRDgeometry()
{
  //
  // AliTRDgeometry destructor
  //

}

//_____________________________________________________________________________
void AliTRDgeometry::Init()
{
  //
  // Initializes the geometry parameter
  //
  // The maximum number of pads
  // and the position of pad 0,0,0 
  // 
  // chambers seen from the top:
  //     +----------------------------+
  //     |                            |
  //     |                            |      ^
  //     |                            |  rphi|
  //     |                            |      |
  //     |0                           |      | 
  //     +----------------------------+      +------>
  //                                             z 
  // chambers seen from the side:            ^
  //     +----------------------------+ drift|
  //     |0                           |      |
  //     |                            |      |
  //     +----------------------------+      +------>
  //                                             z
  //                                             
  // IMPORTANT: time bin 0 is now the first one in the drift region 
  // closest to the readout !!!
  //

  Int_t icham;
  Int_t iplan;
  Int_t isect;

  // The outer width of the chambers
  fCwidth[0] =  94.8;
  fCwidth[1] =  99.3;
  fCwidth[2] = 103.7;
  fCwidth[3] = 108.1;
  fCwidth[4] = 112.6;
  fCwidth[5] = 117.0;

  // The outer lengths of the chambers
  // Includes the spacings between the chambers!
  Float_t length[kNplan][kNcham]   = { { 124.0, 124.0, 110.0, 124.0, 124.0 }
                                     , { 131.0, 131.0, 110.0, 131.0, 131.0 }
                                     , { 138.0, 138.0, 110.0, 138.0, 138.0 }
                                     , { 145.0, 145.0, 110.0, 145.0, 145.0 }
                                     , { 147.0, 147.0, 110.0, 147.0, 147.0 }
                                     , { 147.0, 147.0, 110.0, 147.0, 147.0 } };

  for (icham = 0; icham < kNcham; icham++) {
    for (iplan = 0; iplan < kNplan; iplan++) {
      fClength[iplan][icham]   = length[iplan][icham];
      fClengthPH[iplan][icham] = 0.0;
      fClengthRH[iplan][icham] = 0.0;
    }
  }

  // The rotation matrix elements
  Float_t phi = 0;
  for (isect = 0; isect < fgkNsect; isect++) {
    phi = -2.0 * TMath::Pi() /  (Float_t) fgkNsect * ((Float_t) isect + 0.5);
    fRotA11[isect] = TMath::Cos(phi);
    fRotA12[isect] = TMath::Sin(phi);
    fRotA21[isect] = TMath::Sin(phi);
    fRotA22[isect] = TMath::Cos(phi);
    phi = -1.0 * phi;
    fRotB11[isect] = TMath::Cos(phi);
    fRotB12[isect] = TMath::Sin(phi);
    fRotB21[isect] = TMath::Sin(phi);
    fRotB22[isect] = TMath::Cos(phi);
  }
 
}

//_____________________________________________________________________________
void AliTRDgeometry::CreateGeometry(Int_t* )
{
  //
  // Create TRD geometry
  //

}

//_____________________________________________________________________________
Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local
                                   , Float_t *global
                                   , AliTRDparameter *par) const
{
  //
  // Converts local pad-coordinates (row,col,time) into 
  // global ALICE reference frame coordinates (x,y,z)
  //

  Int_t icham = GetChamber(idet);    // Chamber info (0-4)
  Int_t isect = GetSector(idet);     // Sector info  (0-17)
  Int_t iplan = GetPlane(idet);      // Plane info   (0-5)

  return Local2Global(iplan,icham,isect,local,global,par);

}
 
//_____________________________________________________________________________
Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
                                  , Float_t *local, Float_t *global
                                  , AliTRDparameter *par) const
{
  //
  // Converts local pad-coordinates (row,col,time) into 
  // global ALICE reference frame coordinates (x,y,z)
  //

  if (!par) {
    Error("Local2Global","No parameter defined\n");
    return kFALSE;
  }

  Int_t    idet      = GetDetector(iplan,icham,isect); // Detector number

  Float_t  padRow    = local[0]+0.5;                   // Pad Row position
  Float_t  padCol    = local[1]+0.5;                   // Pad Column position
  Float_t  timeSlice = local[2]+0.5;                   // Time "position"

  Float_t  row0      = par->GetRow0(iplan,icham,isect);
  Float_t  col0      = par->GetCol0(iplan);
  Float_t  time0     = par->GetTime0(iplan);

  Float_t  rot[3];

  // calculate (x,y,z) position in rotated chamber
  rot[0] = time0 - (timeSlice - par->GetTimeBefore()) 
         * par->GetTimeBinSize();
  rot[1] = col0  + padCol                    
         * par->GetColPadSize(iplan);
  rot[2] = row0  + padRow                    
         * par->GetRowPadSize(iplan,icham,isect);

  // Rotate back to original position
  return RotateBack(idet,rot,global);

}


//_____________________________________________________________________________
Bool_t AliTRDgeometry::Global2Local(Int_t mode, Float_t *local, Float_t *global, Int_t* index,  AliTRDparameter *par) const
{
  //
  // Converts local pad-coordinates (row,col,time) into 
  // global ALICE reference frame coordinates (x,y,z)
  //
  //index[0]=plane number
  //index[1]=chamber number
  //index[2]=sector number
  //
  // mode=0  - local coordinate in y, z,             x - rotated global   
  // mode=2  - local coordinate in pad, and pad row, x - rotated global
  //
  if (!par) {
    Error("Local2Global","No parameter defined\n");
    return kFALSE;
  }
  
  //Int_t    idet    = GetDetector(iplan,icham,isect); // Detector number
  Int_t    idet      = GetDetector(index[0],index[1],index[2]); // Detector number
  Rotate(idet,global,local);
  if (mode==0) return kTRUE;
  //
  //  Float_t  row0      = par->GetRow0(iplan,icham,isect);
  //Float_t  col0      = par->GetCol0(iplan);
  //Float_t  time0     = par->GetTime0(iplan);
  //
  // mode 1 to be implemented later
  // calculate (x,y,z) position in time bin pad row pad
  //
  //rot[0] = time0 - (timeSlice - par->GetTimeBefore()) 
  //       * par->GetTimeBinSize();
  //rot[1] = col0  + padCol                    
  //       * par->GetColPadSize(iplan);
  //rot[2] = row0  + padRow                    
  //       * par->GetRowPadSize(iplan,icham,isect);

  return kTRUE;

}

//___________________________________________________________________
Bool_t   AliTRDgeometry::Global2Detector(Float_t global[3], Int_t index[3], AliTRDparameter *par)
{
  //  
  //
  //input = global position
  //output =index
  //index[0]=plane number
  //index[1]=chamber number
  //index[2]=sector number
  Float_t fi;
  //
  fi = TMath::ATan2(global[1],global[0]);
  if (fi<0) fi += 2*TMath::Pi();
  index[2] = Int_t(TMath::Nint((fi - GetAlpha()/2.)/GetAlpha()));
  //
  //
  Float_t locx = global[0] * fRotA11[index[2]] + global[1] * fRotA12[index[2]];  
  index[0] = 0;
  Float_t max = locx-par->GetTime0(0);
  for (Int_t iplane=1; iplane<fgkNplan;iplane++){
    Float_t dist = TMath::Abs(locx-par->GetTime0(iplane));
    if (dist < max){
      index[0] = iplane;
      max = dist;
    }
  }
  Float_t theta = TMath::ATan2(global[2],locx);
  index[1] = TMath::Nint(float(fgkNcham)*theta/(0.25*TMath::Pi()));
  return kTRUE;

}


//_____________________________________________________________________________
Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
{
  //
  // Rotates all chambers in the position of sector 0 and transforms
  // the coordinates in the ALICE restframe <pos> into the 
  // corresponding local frame <rot>.
  //

  Int_t sector = GetSector(d);

  rot[0] =  pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
  rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
  rot[2] =  pos[2];

  return kTRUE;

}

//_____________________________________________________________________________
Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
{
  //
  // Rotates a chambers from the position of sector 0 into its
  // original position and transforms the corresponding local frame 
  // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
  //

  Int_t sector = GetSector(d);

  pos[0] =  rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
  pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
  pos[2] =  rot[2];

  return kTRUE;

}

//_____________________________________________________________________________
Int_t AliTRDgeometry::GetDetectorSec(Int_t p, Int_t c) const
{
  //
  // Convert plane / chamber into detector number for one single sector
  //

  return (p + c * fgkNplan);

}

//_____________________________________________________________________________
Int_t AliTRDgeometry::GetDetector(Int_t p, Int_t c, Int_t s) const
{
  //
  // Convert plane / chamber / sector into detector number
  //

  return (p + c * fgkNplan + s * fgkNplan * fgkNcham);

}

//_____________________________________________________________________________
Int_t AliTRDgeometry::GetPlane(Int_t d) const
{
  //
  // Reconstruct the plane number from the detector number
  //

  return ((Int_t) (d % fgkNplan));

}

//_____________________________________________________________________________
Int_t AliTRDgeometry::GetChamber(Int_t d) const
{
  //
  // Reconstruct the chamber number from the detector number
  //

  return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);

}

//_____________________________________________________________________________
Int_t AliTRDgeometry::GetSector(Int_t d) const
{
  //
  // Reconstruct the sector number from the detector number
  //

  return ((Int_t) (d / (fgkNplan * fgkNcham)));

}

//_____________________________________________________________________________
void AliTRDgeometry::SetOldGeometry()
{
  //
  // Use the old chamber lengths
  //

  Int_t icham;
  Int_t iplan;

  Float_t length[kNplan][kNcham]   = { { 123.5, 123.5, 110.0, 123.5, 123.5 }
				     , { 131.0, 131.0, 110.0, 131.0, 131.0 }
				     , { 134.5, 138.5, 110.0, 138.5, 134.5 }
				     , { 142.0, 146.0, 110.0, 146.0, 142.0 }
				     , { 142.0, 153.0, 110.0, 153.0, 142.0 }
                                     , { 134.0, 160.5, 110.0, 160.5, 134.0 } };

  for (icham = 0; icham < kNcham; icham++) {
    for (iplan = 0; iplan < kNplan; iplan++) {
      fClength[iplan][icham]   = length[iplan][icham];
    }
  }

}

//_____________________________________________________________________________
AliTRDgeometry* AliTRDgeometry::GetGeometry(AliRunLoader* runLoader)
{
  //
  // load the geometry from the galice file
  //

  if (!runLoader) runLoader = AliRunLoader::GetRunLoader();
  if (!runLoader) {
    ::Error("AliTRDgeometry::GetGeometry", "No run loader");
    return NULL;
  }

  TDirectory* saveDir = gDirectory;
  runLoader->CdGAFile();

  AliTRDgeometry* geom = (AliTRDgeometry*) gDirectory->Get("TRDgeometry");
  if (!geom) ::Error("AliTRDgeometry::GetGeometry", "Geometry not found");

  saveDir->cd();
  return geom;
}
Commit	Line	Data
f7336fa3	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
afc51ac2	16	/* $Id$ */
f7336fa3	17
	18	///////////////////////////////////////////////////////////////////////////////
	19	// //
	20	// TRD geometry class //
	21	// //
	22	///////////////////////////////////////////////////////////////////////////////
	23
793ff80c	24
bdbb05bb	25	#include <TError.h>
	26
	27	#include "AliRunLoader.h"
f7336fa3	28	#include "AliTRDgeometry.h"
5443e65e	29	#include "AliTRDparameter.h"
f7336fa3	30
	31	ClassImp(AliTRDgeometry)
	32
793ff80c	33	//_____________________________________________________________________________
	34
	35	//
	36	// The geometry constants
	37	//
	38	const Int_t AliTRDgeometry::fgkNsect = kNsect;
	39	const Int_t AliTRDgeometry::fgkNplan = kNplan;
	40	const Int_t AliTRDgeometry::fgkNcham = kNcham;
	41	const Int_t AliTRDgeometry::fgkNdet = kNdet;
	42
	43	//
	44	// Dimensions of the detector
	45	//
0a770ac9	46
0a770ac9	47	// Inner and outer radius of the mother volumes
793ff80c	48	const Float_t AliTRDgeometry::fgkRmin = 294.0;
	49	const Float_t AliTRDgeometry::fgkRmax = 368.0;
	50
0a770ac9	51	// Upper and lower length of the mother volumes
793ff80c	52	const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
	53	const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
	54
0a770ac9	55	// Parameter of the BTR mother volumes
793ff80c	56	const Float_t AliTRDgeometry::fgkSheight = 74.0;
	57	const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
	58	const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
	59	const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
	60	const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
	61	const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
	62
73ae7b59	63	// The super module side plates
	64	const Float_t AliTRDgeometry::fgkSMpltT = 0.2;
	65	const Float_t AliTRDgeometry::fgkSMgapT = 0.5;
	66
0a770ac9	67	// Height of different chamber parts
	68	// Radiator
	69	const Float_t AliTRDgeometry::fgkCraH = 4.8;
	70	// Drift region
	71	const Float_t AliTRDgeometry::fgkCdrH = 3.0;
	72	// Amplification region
	73	const Float_t AliTRDgeometry::fgkCamH = 0.7;
	74	// Readout
73ae7b59	75	const Float_t AliTRDgeometry::fgkCroH = 2.316;
0a770ac9	76	// Total height
	77	const Float_t AliTRDgeometry::fgkCH = AliTRDgeometry::fgkCraH
	78	+ AliTRDgeometry::fgkCdrH
	79	+ AliTRDgeometry::fgkCamH
	80	+ AliTRDgeometry::fgkCroH;
	81
	82	// Vertical spacing of the chambers
73ae7b59	83	const Float_t AliTRDgeometry::fgkVspace = 1.784;
0a770ac9	84
	85	// Horizontal spacing of the chambers
	86	const Float_t AliTRDgeometry::fgkHspace = 2.0;
	87
	88	// Thicknesses of different parts of the chamber frame
	89	// Lower aluminum frame
	90	const Float_t AliTRDgeometry::fgkCalT = 0.3;
	91	// Lower G10 frame sides
	92	const Float_t AliTRDgeometry::fgkCclsT = 0.3;
	93	// Lower G10 frame front
	94	const Float_t AliTRDgeometry::fgkCclfT = 1.0;
	95	// Upper G10 frame
	96	const Float_t AliTRDgeometry::fgkCcuT = 0.9;
	97	// Upper Al frame
	98	const Float_t AliTRDgeometry::fgkCauT = 1.5;
	99
	100	// Additional width of the readout chamber frames
	101	const Float_t AliTRDgeometry::fgkCroW = 0.9;
	102
	103	// Difference of outer chamber width and pad plane width
73ae7b59	104	//const Float_t AliTRDgeometry::fgkCpadW = 1.0;
73ae7b59	105	const Float_t AliTRDgeometry::fgkCpadW = 0.0;
de6df1b1	106	const Float_t AliTRDgeometry::fgkRpadW = 1.0;
793ff80c	107
	108	//
	109	// Thickness of the the material layers
	110	//
db30bf0f	111	const Float_t AliTRDgeometry::fgkRaThick = 0.3646;
793ff80c	112	const Float_t AliTRDgeometry::fgkMyThick = 0.005;
0a770ac9	113	const Float_t AliTRDgeometry::fgkDrThick = AliTRDgeometry::fgkCdrH;
	114	const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkCamH;
	115	const Float_t AliTRDgeometry::fgkXeThick = AliTRDgeometry::fgkDrThick
	116	+ AliTRDgeometry::fgkAmThick;
793ff80c	117	const Float_t AliTRDgeometry::fgkCuThick = 0.001;
	118	const Float_t AliTRDgeometry::fgkSuThick = 0.06;
	119	const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
	120	const Float_t AliTRDgeometry::fgkCoThick = 0.02;
db30bf0f	121	const Float_t AliTRDgeometry::fgkWaThick = 0.02;
793ff80c	122
	123	//
	124	// Position of the material layers
	125	//
0a770ac9	126	const Float_t AliTRDgeometry::fgkRaZpos = -1.50;
	127	const Float_t AliTRDgeometry::fgkMyZpos = 0.895;
	128	const Float_t AliTRDgeometry::fgkDrZpos = 2.4;
	129	const Float_t AliTRDgeometry::fgkAmZpos = 0.0;
	130	const Float_t AliTRDgeometry::fgkCuZpos = -0.9995;
793ff80c	131	const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
0a770ac9	132	const Float_t AliTRDgeometry::fgkFeZpos = 0.0322;
	133	const Float_t AliTRDgeometry::fgkCoZpos = 0.97;
	134	const Float_t AliTRDgeometry::fgkWaZpos = 0.99;
793ff80c	135
f7336fa3	136	//_____________________________________________________________________________
	137	AliTRDgeometry::AliTRDgeometry():AliGeometry()
	138	{
	139	//
	140	// AliTRDgeometry default constructor
	141	//
	142
	143	Init();
	144
	145	}
	146
	147	//_____________________________________________________________________________
	148	AliTRDgeometry::~AliTRDgeometry()
	149	{
8230f242	150	//
	151	// AliTRDgeometry destructor
	152	//
f7336fa3	153
	154	}
	155
	156	//_____________________________________________________________________________
	157	void AliTRDgeometry::Init()
	158	{
	159	//
	160	// Initializes the geometry parameter
	161	//
f7336fa3	162	// The maximum number of pads
	163	// and the position of pad 0,0,0
	164	//
	165	// chambers seen from the top:
	166	// +----------------------------+
	167	// \| \|
793ff80c	168	// \| \| ^
	169	// \| \| rphi\|
	170	// \| \| \|
	171	// \|0 \| \|
	172	// +----------------------------+ +------>
f7336fa3	173	// z
793ff80c	174	// chambers seen from the side: ^
	175	// +----------------------------+ drift\|
	176	// \|0 \| \|
	177	// \| \| \|
	178	// +----------------------------+ +------>
f7336fa3	179	// z
f7336fa3	180	//
a2b90f83	181	// IMPORTANT: time bin 0 is now the first one in the drift region
a2b90f83	182	// closest to the readout !!!
793ff80c	183	//
f7336fa3	184
0a770ac9	185	Int_t icham;
	186	Int_t iplan;
	187	Int_t isect;
	188
	189	// The outer width of the chambers
73ae7b59	190	fCwidth[0] = 94.8;
	191	fCwidth[1] = 99.3;
	192	fCwidth[2] = 103.7;
	193	fCwidth[3] = 108.1;
	194	fCwidth[4] = 112.6;
	195	fCwidth[5] = 117.0;
0a770ac9	196
0a770ac9	197	// The outer lengths of the chambers
73ae7b59	198	// Includes the spacings between the chambers!
8737e16f	199	Float_t length[kNplan][kNcham] = { { 124.0, 124.0, 110.0, 124.0, 124.0 }
	200	, { 131.0, 131.0, 110.0, 131.0, 131.0 }
	201	, { 138.0, 138.0, 110.0, 138.0, 138.0 }
	202	, { 145.0, 145.0, 110.0, 145.0, 145.0 }
	203	, { 147.0, 147.0, 110.0, 147.0, 147.0 }
	204	, { 147.0, 147.0, 110.0, 147.0, 147.0 } };
0a770ac9	205
	206	for (icham = 0; icham < kNcham; icham++) {
	207	for (iplan = 0; iplan < kNplan; iplan++) {
	208	fClength[iplan][icham] = length[iplan][icham];
	209	fClengthPH[iplan][icham] = 0.0;
	210	fClengthRH[iplan][icham] = 0.0;
	211	}
	212	}
	213
793ff80c	214	// The rotation matrix elements
	215	Float_t phi = 0;
	216	for (isect = 0; isect < fgkNsect; isect++) {
5443e65e	217	phi = -2.0 * TMath::Pi() / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
793ff80c	218	fRotA11[isect] = TMath::Cos(phi);
	219	fRotA12[isect] = TMath::Sin(phi);
	220	fRotA21[isect] = TMath::Sin(phi);
	221	fRotA22[isect] = TMath::Cos(phi);
	222	phi = -1.0 * phi;
	223	fRotB11[isect] = TMath::Cos(phi);
	224	fRotB12[isect] = TMath::Sin(phi);
	225	fRotB21[isect] = TMath::Sin(phi);
	226	fRotB22[isect] = TMath::Cos(phi);
	227	}
	228
	229	}
	230
f7336fa3	231	//_____________________________________________________________________________
73ae7b59	232	void AliTRDgeometry::CreateGeometry(Int_t* )
f7336fa3	233	{
f7336fa3	234	//
0a770ac9	235	// Create TRD geometry
0a770ac9	236	//
f7336fa3	237
	238	}
	239
	240	//_____________________________________________________________________________
5443e65e	241	Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local
	242	, Float_t *global
	243	, AliTRDparameter *par) const
f7336fa3	244	{
	245	//
	246	// Converts local pad-coordinates (row,col,time) into
	247	// global ALICE reference frame coordinates (x,y,z)
	248	//
	249
793ff80c	250	Int_t icham = GetChamber(idet); // Chamber info (0-4)
	251	Int_t isect = GetSector(idet); // Sector info (0-17)
	252	Int_t iplan = GetPlane(idet); // Plane info (0-5)
f7336fa3	253
5443e65e	254	return Local2Global(iplan,icham,isect,local,global,par);
f7336fa3	255
	256	}
	257
	258	//_____________________________________________________________________________
	259	Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
5443e65e	260	, Float_t local, Float_t global
5443e65e	261	, AliTRDparameter *par) const
f7336fa3	262	{
	263	//
	264	// Converts local pad-coordinates (row,col,time) into
	265	// global ALICE reference frame coordinates (x,y,z)
	266	//
	267
5443e65e	268	if (!par) {
	269	Error("Local2Global","No parameter defined\n");
	270	return kFALSE;
	271	}
	272
793ff80c	273	Int_t idet = GetDetector(iplan,icham,isect); // Detector number
f7336fa3	274
16bf9884	275	Float_t padRow = local[0]+0.5; // Pad Row position
	276	Float_t padCol = local[1]+0.5; // Pad Column position
	277	Float_t timeSlice = local[2]+0.5; // Time "position"
f7336fa3	278
5443e65e	279	Float_t row0 = par->GetRow0(iplan,icham,isect);
	280	Float_t col0 = par->GetCol0(iplan);
	281	Float_t time0 = par->GetTime0(iplan);
f7336fa3	282
793ff80c	283	Float_t rot[3];
f7336fa3	284
f7336fa3	285	// calculate (x,y,z) position in rotated chamber
5443e65e	286	rot[0] = time0 - (timeSlice - par->GetTimeBefore())
	287	* par->GetTimeBinSize();
	288	rot[1] = col0 + padCol
	289	* par->GetColPadSize(iplan);
	290	rot[2] = row0 + padRow
	291	* par->GetRowPadSize(iplan,icham,isect);
f7336fa3	292
	293	// Rotate back to original position
	294	return RotateBack(idet,rot,global);
	295
	296	}
	297
3d7b6a24	298
	299
	300	//_____________________________________________________________________________
	301	Bool_t AliTRDgeometry::Global2Local(Int_t mode, Float_t local, Float_t global, Int_t* index, AliTRDparameter *par) const
	302	{
	303	//
	304	// Converts local pad-coordinates (row,col,time) into
	305	// global ALICE reference frame coordinates (x,y,z)
	306	//
	307	//index[0]=plane number
	308	//index[1]=chamber number
	309	//index[2]=sector number
	310	//
	311	// mode=0 - local coordinate in y, z, x - rotated global
	312	// mode=2 - local coordinate in pad, and pad row, x - rotated global
	313	//
	314	if (!par) {
	315	Error("Local2Global","No parameter defined\n");
	316	return kFALSE;
	317	}
	318
	319	//Int_t idet = GetDetector(iplan,icham,isect); // Detector number
	320	Int_t idet = GetDetector(index[0],index[1],index[2]); // Detector number
	321	Rotate(idet,global,local);
	322	if (mode==0) return kTRUE;
	323	//
	324	// Float_t row0 = par->GetRow0(iplan,icham,isect);
	325	//Float_t col0 = par->GetCol0(iplan);
	326	//Float_t time0 = par->GetTime0(iplan);
	327	//
	328	// mode 1 to be implemented later
	329	// calculate (x,y,z) position in time bin pad row pad
	330	//
	331	//rot[0] = time0 - (timeSlice - par->GetTimeBefore())
	332	// * par->GetTimeBinSize();
	333	//rot[1] = col0 + padCol
	334	// * par->GetColPadSize(iplan);
	335	//rot[2] = row0 + padRow
	336	// * par->GetRowPadSize(iplan,icham,isect);
	337
	338	return kTRUE;
	339
	340	}
	341
	342	//___________________________________________________________________
	343	Bool_t AliTRDgeometry::Global2Detector(Float_t global[3], Int_t index[3], AliTRDparameter *par)
	344	{
	345	//
	346	//
	347	//input = global position
	348	//output =index
	349	//index[0]=plane number
	350	//index[1]=chamber number
	351	//index[2]=sector number
	352	Float_t fi;
	353	//
	354	fi = TMath::ATan2(global[1],global[0]);
	355	if (fi<0) fi += 2*TMath::Pi();
	356	index[2] = Int_t(TMath::Nint((fi - GetAlpha()/2.)/GetAlpha()));
	357	//
	358	//
	359	Float_t locx = global[0] * fRotA11[index[2]] + global[1] * fRotA12[index[2]];
	360	index[0] = 0;
	361	Float_t max = locx-par->GetTime0(0);
362	for (Int_t iplane=1; iplane<fgkNplan;iplane++){
363	Float_t dist = TMath::Abs(locx-par->GetTime0(iplane));
364	if (dist < max){
365	index[0] = iplane;
366	max = dist;
367	}
368	}
369	Float_t theta = TMath::ATan2(global[2],locx);
370	index[1] = TMath::Nint(float(fgkNcham)theta/(0.25TMath::Pi()));
371	return kTRUE;
372
373	}
374
375
f7336fa3	376	//_____________________________________________________________________________
793ff80c	377	Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t pos, Float_t rot) const
f7336fa3	378	{
	379	//
	380	// Rotates all chambers in the position of sector 0 and transforms
	381	// the coordinates in the ALICE restframe <pos> into the
	382	// corresponding local frame <rot>.
	383	//
	384
793ff80c	385	Int_t sector = GetSector(d);
f7336fa3	386
793ff80c	387	rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
793ff80c	388	rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
f7336fa3	389	rot[2] = pos[2];
	390
	391	return kTRUE;
	392
	393	}
	394
	395	//_____________________________________________________________________________
94de3818	396	Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t rot, Float_t pos) const
f7336fa3	397	{
	398	//
	399	// Rotates a chambers from the position of sector 0 into its
	400	// original position and transforms the corresponding local frame
	401	// coordinates <rot> into the coordinates of the ALICE restframe <pos>.
	402	//
	403
793ff80c	404	Int_t sector = GetSector(d);
f7336fa3	405
793ff80c	406	pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
793ff80c	407	pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
6f1e466d	408	pos[2] = rot[2];
f7336fa3	409
	410	return kTRUE;
	411
	412	}
	413
	414	//_____________________________________________________________________________
afc51ac2	415	Int_t AliTRDgeometry::GetDetectorSec(Int_t p, Int_t c) const
0a770ac9	416	{
	417	//
	418	// Convert plane / chamber into detector number for one single sector
	419	//
	420
	421	return (p + c * fgkNplan);
	422
	423	}
	424
	425	//_____________________________________________________________________________
afc51ac2	426	Int_t AliTRDgeometry::GetDetector(Int_t p, Int_t c, Int_t s) const
f7336fa3	427	{
	428	//
	429	// Convert plane / chamber / sector into detector number
	430	//
	431
793ff80c	432	return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
f7336fa3	433
	434	}
	435
	436	//_____________________________________________________________________________
afc51ac2	437	Int_t AliTRDgeometry::GetPlane(Int_t d) const
f7336fa3	438	{
	439	//
	440	// Reconstruct the plane number from the detector number
	441	//
	442
793ff80c	443	return ((Int_t) (d % fgkNplan));
f7336fa3	444
	445	}
	446
	447	//_____________________________________________________________________________
afc51ac2	448	Int_t AliTRDgeometry::GetChamber(Int_t d) const
f7336fa3	449	{
	450	//
	451	// Reconstruct the chamber number from the detector number
	452	//
	453
793ff80c	454	return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
f7336fa3	455
	456	}
	457
	458	//_____________________________________________________________________________
afc51ac2	459	Int_t AliTRDgeometry::GetSector(Int_t d) const
f7336fa3	460	{
	461	//
	462	// Reconstruct the sector number from the detector number
	463	//
	464
793ff80c	465	return ((Int_t) (d / (fgkNplan * fgkNcham)));
f7336fa3	466
	467	}
	468
8737e16f	469	//_____________________________________________________________________________
	470	void AliTRDgeometry::SetOldGeometry()
	471	{
	472	//
	473	// Use the old chamber lengths
	474	//
	475
	476	Int_t icham;
	477	Int_t iplan;
	478
	479	Float_t length[kNplan][kNcham] = { { 123.5, 123.5, 110.0, 123.5, 123.5 }
	480	, { 131.0, 131.0, 110.0, 131.0, 131.0 }
	481	, { 134.5, 138.5, 110.0, 138.5, 134.5 }
	482	, { 142.0, 146.0, 110.0, 146.0, 142.0 }
	483	, { 142.0, 153.0, 110.0, 153.0, 142.0 }
	484	, { 134.0, 160.5, 110.0, 160.5, 134.0 } };
	485
	486	for (icham = 0; icham < kNcham; icham++) {
	487	for (iplan = 0; iplan < kNplan; iplan++) {
	488	fClength[iplan][icham] = length[iplan][icham];
	489	}
	490	}
	491
	492	}
bdbb05bb	493
	494	//_____________________________________________________________________________
	495	AliTRDgeometry* AliTRDgeometry::GetGeometry(AliRunLoader* runLoader)
	496	{
	497	//
	498	// load the geometry from the galice file
	499	//
	500
	501	if (!runLoader) runLoader = AliRunLoader::GetRunLoader();
	502	if (!runLoader) {
	503	::Error("AliTRDgeometry::GetGeometry", "No run loader");
	504	return NULL;
	505	}
	506
	507	TDirectory* saveDir = gDirectory;
	508	runLoader->CdGAFile();
	509
	510	AliTRDgeometry* geom = (AliTRDgeometry*) gDirectory->Get("TRDgeometry");
	511	if (!geom) ::Error("AliTRDgeometry::GetGeometry", "Geometry not found");
	512
	513	saveDir->cd();
	514	return geom;
	515	}