HMPID/AliHMPIDDigit.h

   1 #ifndef AliHMPIDDigit_h
   2 #define AliHMPIDDigit_h
   3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   4  * See cxx source for full Copyright notice                               */
   5
   6 // Class of HMPID to manage digits ---> pads
   7 //.
   8 //.
   9 //.
  10
  11 #include <AliDigit.h>      //base class
  12 #include <AliRawReader.h>
  13 #include <AliLog.h>
  14 #include "TMath.h"         //Mathieson()
  15 #include <AliBitPacking.h> //Raw()
  16 #include "AliHMPIDParam.h"
  17 //#include "AliHMPIDRawStream.h"
  18
  19 class TClonesArray;        //Hit2Sdi()
  20
  21 class AliHMPIDDigit :public AliDigit //TObject-AliDigit-AliHMPIDDigit
  22 {
  23 public:
  24
  25 //ctor&dtor
  26   AliHMPIDDigit(                          ):AliDigit( ),fPad(AliHMPIDParam::Abs(-1,-1,-1,-1)),fQ(-1)  {}                         //default ctor
  27   AliHMPIDDigit(Int_t pad,Int_t q,Int_t *t):AliDigit(t),fPad(pad             ),fQ(q )  {if(fQ>4095)fQ=4095;}                     //digit ctor
  28   AliHMPIDDigit(Int_t pad,Int_t q         ):AliDigit( ),fPad(pad             ),fQ(q )  {if(fQ>4095)fQ=4095;}                     //digit ctor
  29   AliHMPIDDigit(const AliHMPIDDigit &d    ):AliDigit(d),fPad(d.fPad),fQ(d.fQ)          {}                                        //copy ctor
  30   virtual ~AliHMPIDDigit()                                                             {}                         //dtor
  31 //framework part
  32          Bool_t  IsSortable  (                               )const{return kTRUE;}                                                     //provision to use TObject::Sort()
  33   inline Int_t   Compare     (const TObject *pObj            )const;                                                                   //provision to use TObject::Sort()
  34          void    Draw        (Option_t *opt=""               );                                                                        //TObject::Draw() overloaded
  35          void    Print       (Option_t *opt=""               )const;                                                                   //TObject::Print() overloaded
  36 //private part
  37
  38          void    AddTidOffset(Int_t offset                   )     {for (Int_t i=0; i<3; i++) if (fTracks[i]>0) fTracks[i]+=offset;  } //needed for merging
  39          Int_t   Ch          (                               )const{return AliHMPIDParam::A2C(fPad);                                                } //chamber number
  40
  41          Float_t LorsX       (                               )const{return AliHMPIDParam::LorsX(AliHMPIDParam::A2P(fPad),AliHMPIDParam::A2X(fPad));                               } //center of the pad x, [cm]
  42
  43          Float_t LorsY       (                               )const{return AliHMPIDParam::LorsY(AliHMPIDParam::A2P(fPad),AliHMPIDParam::A2Y(fPad));                               } //center of the pad y, [cm]
  44 //
  45   inline Double_t MathiesonX   (Double_t x                   )const;                                                                   //Mathieson distribution along wires X
  46   inline Double_t MathiesonY   (Double_t x                   )const;                                                                   //Mathieson distribution perp to wires Y
  47   inline Double_t IntPartMathiX(Double_t z                   )const;                                                                   //integral in 1-dim of Mathieson X
  48   inline Double_t IntPartMathiY(Double_t z                   )const;                                                                   //integral in 1-dim of Mathieson Y
  49   inline Double_t IntMathieson (Double_t x,Double_t y        )const;                                                                   //integral in 2-dim of Mathieson
  50          Int_t   PadPcX      (                               )const{return AliHMPIDParam::A2X(fPad);}                                                 //pad pc x # 0..79
  51          Int_t   PadPcY      (                               )const{return AliHMPIDParam::A2Y(fPad);}                                                 //pad pc y # 0..47
  52          Int_t   PadChX      (                               )const{return (Pc()%2)*AliHMPIDParam::kPadPcX+PadPcX();}                                 //pad ch x # 0..159
  53          Int_t   PadChY      (                               )const{return (Pc()/2)*AliHMPIDParam::kPadPcY+PadPcY();}                                 //pad ch y # 0..143
  54          Int_t   Pad         (                               )const{return fPad;}                                                      //absolute id of this pad
  55          Int_t   Pc          (                               )const{return AliHMPIDParam::A2P(fPad);}                                                 //PC position number
  56          Float_t Q           (                               )const{return fQ;}                                                        //charge, [QDC]
  57   inline void    Raw(UInt_t &w32,Int_t &ddl,Int_t &r,Int_t &d,Int_t &a)const;
  58   inline Bool_t  Set         (Int_t c,Int_t p,Int_t x,Int_t y,Int_t tid=0);                                                            //manual creation
  59          void    SetQ        (Float_t q                      )     {fQ=q;if(fQ>4095)fQ=4095;}                                          //setter for charge
  60          void    SetPad      (Int_t pad                      )     {fPad=pad;}                                                         //setter for pad
  61
  62 protected:                                                                   //AliDigit has fTracks[3]
  63
  64
  65   Int_t    fPad;                                                                                                                       //absolute pad number
  66   Float_t  fQ;                                                               //QDC value, fractions are permitted for summable procedure
  67   ClassDef(AliHMPIDDigit,4)                                                  //HMPID digit class
  68 };//class AliHMPIDDigit
  69
  70 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  71
  72 Int_t AliHMPIDDigit::Compare(const TObject *pObj) const
  73 {
  74 // Used in Sort() method to compare to objects. Note that abs pad structure is first x then y, hence will be sorted on column basis.
  75 // This feature is used in digitizer to facilitate finding of sdigits for the same pad since they all will come together after sorting.
  76 // Arguments: pObj - pointer to object to compare with
  77 //   Retunrs: -1 if AbsPad less then in pObj, 1 if more and 0 if they are the same
  78   if     (fPad==((AliHMPIDDigit*)pObj)->Pad()) return  0;
  79   else if(fPad >((AliHMPIDDigit*)pObj)->Pad()) return  1;
  80   else                                         return -1;
  81 }
  82 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  83
  84 Double_t AliHMPIDDigit::MathiesonX(Double_t x)const
  85 {
  86 // Mathieson function.
  87 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
  88 // Arguments: x- position of the center of Mathieson distribution
  89 //  Returns: value of the Mathieson function
  90
  91   Double_t lambda = x/AliHMPIDParam::PitchAnodeCathode();
  92   Double_t tanh = TMath::TanH(AliHMPIDParam::K2x()*lambda);
  93   Double_t a=1-tanh*tanh;
  94   Double_t b=1+AliHMPIDParam::SqrtK3x()*AliHMPIDParam::SqrtK3x()*tanh*tanh;
  95   Double_t mathi = AliHMPIDParam::K1x()*a/b;
  96   return mathi;
  97 }
  98 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  99
 100 Double_t AliHMPIDDigit::MathiesonY(Double_t y)const
 101 {
 102 // Mathieson function.
 103 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
 104 // Arguments: x- position of the center of Mathieson distribution
 105 //  Returns: value of the Mathieson function
 106
 107   Double_t lambda = y/AliHMPIDParam::PitchAnodeCathode();
 108   Double_t tanh = TMath::TanH(AliHMPIDParam::K2y()*lambda);
 109   Double_t a=1-tanh*tanh;
 110   Double_t b=1+AliHMPIDParam::SqrtK3y()*AliHMPIDParam::SqrtK3y()*tanh*tanh;
 111   Double_t mathi = AliHMPIDParam::K1y()*a/b;
 112   return mathi;
 113 }
 114 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 115
 116 Double_t AliHMPIDDigit::IntPartMathiX(Double_t x)const
 117 {
 118 // Integration of Mathieson.
 119 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
 120 // Arguments: x,y- position of the center of Mathieson distribution
 121 //  Returns: a charge fraction [0-1] imposed into the pad
 122   Double_t shift1 = -LorsX()+0.5*AliHMPIDParam::SizePadX();
 123   Double_t shift2 = -LorsX()-0.5*AliHMPIDParam::SizePadX();
 124
 125   Double_t ux1=AliHMPIDParam::SqrtK3x()*TMath::TanH(AliHMPIDParam::K2x()*(x+shift1)/AliHMPIDParam::PitchAnodeCathode());
 126   Double_t ux2=AliHMPIDParam::SqrtK3x()*TMath::TanH(AliHMPIDParam::K2x()*(x+shift2)/AliHMPIDParam::PitchAnodeCathode());
 127
 128   return AliHMPIDParam::K4x()*(TMath::ATan(ux2)-TMath::ATan(ux1));
 129 }
 130 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 131
 132 Double_t AliHMPIDDigit::IntPartMathiY(Double_t y)const
 133 {
 134 // Integration of Mathieson.
 135 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
 136 // Arguments: x,y- position of the center of Mathieson distribution
 137 //  Returns: a charge fraction [0-1] imposed into the pad
 138   Double_t shift1 = -LorsY()+0.5*AliHMPIDParam::SizePadY();
 139   Double_t shift2 = -LorsY()-0.5*AliHMPIDParam::SizePadY();
 140
 141   Double_t uy1=AliHMPIDParam::SqrtK3y()*TMath::TanH(AliHMPIDParam::K2y()*(y+shift1)/AliHMPIDParam::PitchAnodeCathode());
 142   Double_t uy2=AliHMPIDParam::SqrtK3y()*TMath::TanH(AliHMPIDParam::K2y()*(y+shift2)/AliHMPIDParam::PitchAnodeCathode());
 143
 144   return AliHMPIDParam::K4y()*(TMath::ATan(uy2)-TMath::ATan(uy1));
 145
 146 }
 147 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 148
 149 Double_t AliHMPIDDigit::IntMathieson(Double_t x,Double_t y)const
 150 {
 151 // Integration of Mathieson.
 152 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
 153 // Arguments: x,y- position of the center of Mathieson distribution
 154 //  Returns: a charge fraction [0-1] imposed into the pad
 155
 156   Double_t xm = IntPartMathiX(x);
 157   Double_t ym = IntPartMathiY(y);
 158   return 4*xm*ym;
 159 }
 160 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 161 void AliHMPIDDigit::Raw(UInt_t &w32,Int_t &ddl,Int_t &r,Int_t &d,Int_t &a)const
 162 {
 163 // Convert digit structure to raw word format
 164 // Arguments: w32,ddl,r,d,a where to write the results
 165 //   Returns: none
 166   Int_t y2a[6]={5,3,1,0,2,4};
 167
 168   ddl=2*Ch()+Pc()%2;                    //DDL# 0..13
 169   Int_t tmp=1+Pc()/2*8+PadPcY()/6;  r=(Pc()%2)? tmp:25-tmp;               //row r=1..24
 170   d=1+PadPcX()/8;                       //DILOGIC# 1..10
 171 //  d=AliHMPIDRawStream::kNDILOGICAdd+1-d;                   ////flip according to Paolo (2-9-2008)
 172   d=10+1-d;                                                  ////flip according to Paolo (2-9-2008)
 173   a=y2a[PadPcY()%6]+6*(7-PadPcX()%8);   //ADDRESS 0..47
 174
 175   w32=0;
 176   if(r<1 || r>24 || d<1 || d>10 || a<0 || a>47) {w32=0;ddl=-1;r=-1;d=-1;a=-1; return;}    //clm: the assert is removed not to break the reconstruction code
 177   AliBitPacking::PackWord((UInt_t)fQ,w32, 0,11);                      // 0000 0rrr rrdd ddaa aaaa qqqq qqqq qqqq        Qdc               bits (00..11) counts (0..4095)
 178   AliBitPacking::PackWord(        a ,w32,12,17);                      // 3322 2222 2222 1111 1111 1000 0000 0000        DILOGIC address   bits (12..17) counts (0..47)
 179   AliBitPacking::PackWord(        d ,w32,18,21);                      // 1098 7654 3210 9876 5432 1098 7654 3210        DILOGIC number    bits (18..21) counts (1..10)
 180   AliBitPacking::PackWord(        r ,w32,22,26);                      //                                                Row number        bits (22..26) counts (1..24)
 181   AliBitPacking::PackWord((UInt_t)0, w32,27,27);                      //To make sure set the 27th bit to Zero so we can distinguis it from the EoE
 182 }
 183 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 184 Bool_t AliHMPIDDigit::Set(Int_t ch,Int_t pc,Int_t px,Int_t py,Int_t tid)
 185 {
 186 // Manual creation of digit
 187 // Arguments: ch,pc,px,py,qdc,tid
 188 //   Returns: kTRUE if wrong digit
 189   if(ch<AliHMPIDParam::kMinCh || ch>AliHMPIDParam::kMaxCh) return kTRUE;
 190   if(pc<AliHMPIDParam::kMinPc || pc>AliHMPIDParam::kMaxPc) return kTRUE;
 191   if(px<AliHMPIDParam::kMinPx || px>AliHMPIDParam::kMaxPx) return kTRUE;
 192   if(py<AliHMPIDParam::kMinPy || py>AliHMPIDParam::kMaxPy) return kTRUE;
 193
 194
 195   fPad=AliHMPIDParam::Abs(ch,pc,px,py);fTracks[0]=tid;
 196   fQ=0;
 197   return kFALSE;
 198 }
 199 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 200
 201 #endif