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
  18 class TClonesArray;        //Hit2Sdi()
  19
  20 class AliHMPIDDigit :public AliDigit //TObject-AliDigit-AliHMPIDDigit
  21 {
  22 public:
  23
  24 //ctor&dtor
  25   AliHMPIDDigit(                          ):AliDigit( ),fPad(AliHMPIDParam::Abs(-1,-1,-1,-1)),fQ(-1)  {}                         //default ctor
  26   AliHMPIDDigit(Int_t pad,Int_t q,Int_t *t):AliDigit(t),fPad(pad             ),fQ(q )  {}                         //digit ctor
  27   AliHMPIDDigit(Int_t pad,Int_t q         ):AliDigit( ),fPad(pad             ),fQ(q )  {}                         //digit ctor
  28   AliHMPIDDigit(const AliHMPIDDigit &d    ):AliDigit(d),fPad(d.fPad),fQ(d.fQ)          {}                         //copy ctor
  29   virtual ~AliHMPIDDigit()                                                             {}                         //dtor
  30 //framework part
  31          Bool_t  IsSortable  (                               )const{return kTRUE;}                                                     //provision to use TObject::Sort()
  32   inline Int_t   Compare     (const TObject *pObj            )const;                                                                   //provision to use TObject::Sort()
  33          void    Draw        (Option_t *opt=""               );                                                                        //TObject::Draw() overloaded
  34          void    Print       (Option_t *opt=""               )const;                                                                   //TObject::Print() overloaded
  35 //private part
  36
  37          void    AddTidOffset(Int_t offset                   )     {for (Int_t i=0; i<3; i++) if (fTracks[i]>0) fTracks[i]+=offset;  } //needed for merging
  38          Int_t   Ch          (                               )const{return AliHMPIDParam::A2C(fPad);                                                } //chamber number
  39
  40          Float_t LorsX       (                               )const{return AliHMPIDParam::LorsX(AliHMPIDParam::A2P(fPad),AliHMPIDParam::A2X(fPad));                               } //center of the pad x, [cm]
  41
  42          Float_t LorsY       (                               )const{return AliHMPIDParam::LorsY(AliHMPIDParam::A2P(fPad),AliHMPIDParam::A2Y(fPad));                               } //center of the pad y, [cm]
  43 //
  44   inline Float_t Mathieson   (Float_t x                      )const;                                                                   //Mathieson distribution
  45   inline Float_t IntPartMathi(Float_t z, Int_t axis          )const;                                                                   //integral in 1-dim of Mathieson
  46   inline Float_t IntMathieson(Float_t x,Float_t y            )const;                                                                   //integral in 2-dim of Mathieson
  47          Int_t   PadPcX      (                               )const{return AliHMPIDParam::A2X(fPad);}                                                 //pad pc x # 0..79
  48          Int_t   PadPcY      (                               )const{return AliHMPIDParam::A2Y(fPad);}                                                 //pad pc y # 0..47
  49          Int_t   PadChX      (                               )const{return (Pc()%2)*AliHMPIDParam::kPadPcX+PadPcX();}                                 //pad ch x # 0..159
  50          Int_t   PadChY      (                               )const{return (Pc()/2)*AliHMPIDParam::kPadPcY+PadPcY();}                                 //pad ch y # 0..143
  51          Int_t   Pad         (                               )const{return fPad;}                                                      //absolute id of this pad
  52          Int_t   Pc          (                               )const{return AliHMPIDParam::A2P(fPad);}                                                 //PC position number
  53          Float_t Q           (                               )const{return fQ;}                                                        //charge, [QDC]
  54   inline void    Raw(UInt_t &w32,Int_t &ddl,Int_t &r,Int_t &d,Int_t &a)const;
  55   inline Bool_t  Set         (Int_t c,Int_t p,Int_t x,Int_t y,Int_t tid=0);                                                            //manual creation
  56          void    SetQ        (Float_t q                      )     {fQ=q;}                                                             //manual creation
  57          void    SetNsig     (Int_t sigmas                   )     {AliHMPIDParam::fgSigmas=sigmas;}                                                  //set n sigmas
  58
  59
  60 protected:                                                                   //AliDigit has fTracks[3]
  61
  62
  63   Int_t    fPad;                                                                                                                       //absolute pad number
  64   Float_t  fQ;                                                               //QDC value, fractions are permitted for summable procedure
  65   ClassDef(AliHMPIDDigit,4)                                                  //HMPID digit class
  66 };//class AliHMPIDDigit
  67
  68 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  69
  70 Int_t AliHMPIDDigit::Compare(const TObject *pObj) const
  71 {
  72 // 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.
  73 // This feature is used in digitizer to facilitate finding of sdigits for the same pad since they all will come together after sorting.
  74 // Arguments: pObj - pointer to object to compare with
  75 //   Retunrs: -1 if AbsPad less then in pObj, 1 if more and 0 if they are the same
  76   if     (fPad==((AliHMPIDDigit*)pObj)->Pad()) return  0;
  77   else if(fPad >((AliHMPIDDigit*)pObj)->Pad()) return  1;
  78   else                                         return -1;
  79 }
  80 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  81
  82 Float_t AliHMPIDDigit::Mathieson(Float_t x)const
  83 {
  84 // Mathieson function.
  85 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
  86 // Arguments: x- position of the center of Mathieson distribution
  87 //  Returns: value of the Mathieson function
  88   Float_t  kK1=0.28278795,kK2=0.96242952, kSqrtK3 =0.77459667, kD=0.445;
  89   Float_t lambda = x/kD;
  90   Float_t a=1-TMath::TanH(kK2*lambda)*TMath::TanH(kK2*lambda);
  91   Float_t b=1+kSqrtK3*kSqrtK3*TMath::TanH(kK2*lambda)*TMath::TanH(kK2*lambda);
  92   Float_t mathi = kK1*a/b;
  93   return mathi;
  94 }
  95 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  96
  97 Float_t AliHMPIDDigit::IntPartMathi(Float_t z, Int_t axis)const
  98 {
  99 // Integration of Mathieson.
 100 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
 101 // Arguments: x,y- position of the center of Mathieson distribution
 102 //  Returns: a charge fraction [0-1] imposed into the pad
 103   Float_t shift1,shift2;
 104   if(axis==1) {
 105     shift1 = -LorsX()+0.5*AliHMPIDParam::SizePadX();
 106     shift2 = -LorsX()-0.5*AliHMPIDParam::SizePadX();
 107   } else {
 108     shift1 = -LorsY()+0.5*AliHMPIDParam::SizePadY();
 109     shift2 = -LorsY()-0.5*AliHMPIDParam::SizePadY();
 110   }
 111
 112   Float_t  kK2=0.96242952, kSqrtK3 =0.77459667,  kK4=0.37932926, kD=0.445;
 113
 114   Float_t ux1=kSqrtK3*TMath::TanH(kK2*(z+shift1)/kD);
 115   Float_t ux2=kSqrtK3*TMath::TanH(kK2*(z+shift2)/kD);
 116
 117   return kK4*(TMath::ATan(ux2)-TMath::ATan(ux1));
 118 }
 119 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 120
 121 Float_t AliHMPIDDigit::IntMathieson(Float_t x,Float_t y)const
 122 {
 123 // Integration of Mathieson.
 124 // This is the answer to electrostatic problem of charge distrubution in MWPC described elsewhere. (NIM A370(1988)602-603)
 125 // Arguments: x,y- position of the center of Mathieson distribution
 126 //  Returns: a charge fraction [0-1] imposed into the pad
 127
 128   Float_t xm = IntPartMathi(x,1);
 129   Float_t ym = IntPartMathi(y,2);
 130   return 4*xm*ym;
 131 }
 132 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 133 void AliHMPIDDigit::Raw(UInt_t &w32,Int_t &ddl,Int_t &r,Int_t &d,Int_t &a)const
 134 {
 135 // Convert digit structure to raw word format
 136 // Arguments: w32,ddl,r,d,a where to write the results
 137 //   Returns: none
 138   Int_t y2a[6]={5,3,1,0,2,4};
 139
 140                                     ddl=2*Ch()+Pc()%2;                     //DDL# 0..13
 141   Int_t tmp=1+Pc()/2*8+PadPcY()/6;  r=(Pc()%2)? 25-tmp:tmp;              //row r=1..24
 142                                     d=1+PadPcX()/8;                      //DILOGIC# 1..10
 143                                     a=y2a[PadPcY()%6]+6*(PadPcX()%8);    //ADDRESS 0..47
 144
 145   w32=0;
 146   //Printf("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
 147   //
 148   //Printf("AliHMPIDDigit::Raw ddl: %d r: %d d: %d a: %d",ddl,r,d,a);
 149   //Printf("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
 150 //  Bool_t isOK=kTRUE; isOK=
 151   AliBitPacking::PackWord((fQ>4095)?(UInt_t)4095:(UInt_t)fQ,w32, 0,11);       // 0000 0rrr rrdd ddaa aaaa qqqq qqqq qqqq        Qdc               bits (00..11) counts (0..4095)
 152   //Printf("isOK: %d",isOK);
 153   //molnarl: Since in simulation the the charge can be > than 4095 but not in real life we need to protect. If fQ>4095 after packing we will get 0 for the charge!
 154   assert(0<=a&&a<=47);AliBitPacking::PackWord(        a ,w32,12,17);  // 3322 2222 2222 1111 1111 1000 0000 0000        DILOGIC address   bits (12..17) counts (0..47)
 155   assert(1<=d&&d<=10);AliBitPacking::PackWord(        d ,w32,18,21);  // 1098 7654 3210 9876 5432 1098 7654 3210        DILOGIC number    bits (18..21) counts (1..10)
 156   assert(1<=r&&r<=24);AliBitPacking::PackWord(        r ,w32,22,26);  //                                                Row number        bits (22..26) counts (1..24)
 157                       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
 158 }
 159 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 160 Bool_t AliHMPIDDigit::Set(Int_t ch,Int_t pc,Int_t px,Int_t py,Int_t tid)
 161 {
 162 // Manual creation of digit
 163 // Arguments: ch,pc,px,py,qdc,tid
 164 //   Returns: kTRUE if wrong digit
 165   if(px<AliHMPIDParam::kMinPx || px>AliHMPIDParam::kMaxPx) return kTRUE;
 166   if(py<AliHMPIDParam::kMinPy || py>AliHMPIDParam::kMaxPy) return kTRUE;
 167
 168   fPad=AliHMPIDParam::Abs(ch,pc,px,py);fTracks[0]=tid;
 169   fQ=0;
 170   return kFALSE;
 171 }
 172 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 173
 174 #endif