* provided "as is" without express or implied warranty. *
**************************************************************************/
+/* $Id$ */
+
+#include <Riostream.h>
#include <TMath.h>
-#include <TF1.h>
-#include <iostream.h>
+#include <TGeoManager.h>
+#include <TGeoVolume.h>
+#include <TGeoBBox.h>
#include "AliITSsegmentationSSD.h"
-#include "AliITSgeom.h"
+//////////////////////////////////////////////////////
+// Segmentation class for //
+// silicon strips //
+// //
+//////////////////////////////////////////////////////
+const Float_t AliITSsegmentationSSD::fgkDxDefault = 73000.;
+const Float_t AliITSsegmentationSSD::fgkDzDefault = 40000.;
+const Float_t AliITSsegmentationSSD::fgkDyDefault = 300.;
+const Float_t AliITSsegmentationSSD::fgkPitchDefault = 95.;
+const Int_t AliITSsegmentationSSD::fgkNstripsDefault = 768;
+const Int_t AliITSsegmentationSSD::fgkNchipsPerSide = 6;
+const Int_t AliITSsegmentationSSD::fgkNstripsPerChip = 128;
ClassImp(AliITSsegmentationSSD)
-AliITSsegmentationSSD::AliITSsegmentationSSD(){
- // default constructor
- fGeom=0;
- fCorr=0;
+
+AliITSsegmentationSSD::AliITSsegmentationSSD(Option_t *opt): AliITSsegmentation(),
+fNstrips(0),
+fStereoP(0),
+fStereoN(0),
+fPitch(0),
+fLayer(0){
+ // default constructor
+ SetDetSize(fgkDxDefault,fgkDzDefault,fgkDyDefault);
+ SetPadSize(fgkPitchDefault,0.);
+ SetNPads(fgkNstripsDefault,0);
+ SetAngles();
+ if(strstr(opt,"TGeo")){
+ if(!gGeoManager){
+ AliError("Geometry is not initialized\n");
+ return;
+ }
+ TGeoVolume *v=NULL;
+ v = gGeoManager->GetVolume("ITSssdSensitivL5");
+ if(!v){
+ AliWarning("TGeo volumeITSssdSensitivL5 not found (hint: use v11Hybrid geometry)\n Using hardwired default values");
+ }
+ else {
+ TGeoBBox *s=(TGeoBBox*)v->GetShape();
+ SetDetSize(s->GetDX()*20000.,s->GetDZ()*20000.,s->GetDY()*20000.);
+ }
+ }
}
-//------------------------------
-AliITSsegmentationSSD::AliITSsegmentationSSD(AliITSgeom *geom){
- // constuctor
- fGeom=geom;
- fCorr=0;
- SetDetSize();
- cout<<"Dx="<<fDx<<endl;
- SetPadSize();
- SetNPads();
- Init();
+//______________________________________________________________________
+void AliITSsegmentationSSD::Copy(TObject &obj) const {
+ // protected method. copy this to obj
+ AliITSsegmentation::Copy(obj);
+ ((AliITSsegmentationSSD& ) obj).Clear();
+ ((AliITSsegmentationSSD& ) obj).fNstrips = fNstrips;
+ ((AliITSsegmentationSSD& ) obj).fStereoP = fStereoP;
+ ((AliITSsegmentationSSD& ) obj).fStereoN = fStereoN;
+ ((AliITSsegmentationSSD& ) obj).fLayer = fLayer;
+ ((AliITSsegmentationSSD& ) obj).fPitch = fPitch;
+ ((AliITSsegmentationSSD& ) obj).fLayer = fLayer;
+
}
-//____________________________________________________________________________
-AliITSsegmentationSSD& AliITSsegmentationSSD::operator=(AliITSsegmentationSSD &source){
+
+//______________________________________________________________________
+AliITSsegmentationSSD& AliITSsegmentationSSD::operator=(
+ const AliITSsegmentationSSD &source){
// Operator =
- if(this==&source) return *this;
- this->fNstrips = source.fNstrips;
- this->fStereoP = source.fStereoP;
- this->fStereoN = source.fStereoN;
- this->fPitch = source.fPitch;
- this->fDz = source.fDz;
- this->fDx = source.fDx;
- this->fDy = source.fDy;
- this->fGeom = source.fGeom; // copy only the pointer
- this->fCorr = new TF1(*(source.fCorr)); // make a proper copy
- return *this;
-
+ if(this != &source){
+ source.Copy(*this);
+ }
+ return *this;
}
-//____________________________________________________________________________
-AliITSsegmentationSSD::AliITSsegmentationSSD(AliITSsegmentationSSD &source){
- // copy constructor
- *this = source;
+//______________________________________________________________________
+AliITSsegmentationSSD::AliITSsegmentationSSD(const AliITSsegmentationSSD &source):
+ AliITSsegmentation(source),
+fNstrips(0),
+fStereoP(0),
+fStereoN(0),
+fPitch(0),
+fLayer(0){
+ // copy constructor
+ source.Copy(*this);
}
-//------------------------------
+//----------------------------------------------------------------------
void AliITSsegmentationSSD::Init(){
- // standard initalizer
-
- //AliITSgeomSSD *gssd = (AliITSgeomSSD *) (fGeom->GetShape(5,1,1));
- //const Float_t kconv=10000.;
- /*
- fDx = 2.*kconv*gssd->GetDx();
- fDz = 2.*kconv*gssd->GetDz();
- fDy = 2.*kconv*gssd->GetDy();
- */
- SetPadSize();
- SetNPads();
- SetAngles();
+ // standard initalizer
+ SetPadSize(fgkPitchDefault,0.);
+ SetNPads(fgkNstripsDefault,0);
+ SetAngles();
}
-//-------------------------------------------------------
-void AliITSsegmentationSSD::GetPadTxz(Float_t &x,Float_t &z){
- // returns P and N sided strip numbers for a given location.
+//----------------------------------------------------------------------
+void AliITSsegmentationSSD::Angles(Float_t &aP,Float_t &aN) const{
+ // P and N side stereo angles
+ aP = fStereoP;
+ aN = fStereoN;
+}
+//----------------------------------------------------------------------
+void AliITSsegmentationSSD::SetLayer(Int_t l){
+ //set fLayer data member (only 5 or 6 are allowed)
+ if (l==5) fLayer =5;
+ else if (l==6) fLayer =6;
+ else AliError(Form("Layer can be 5 or 6, not %d",l));
+}
+//----------------------------------------------------------------------
+void AliITSsegmentationSSD::GetPadTxz(Float_t &x,Float_t &z) const{
+ // returns P and N sided strip numbers for a given location.
// Transformation from microns detector center local coordinates
// to detector P and N side strip numbers..
/* _- Z
|00/
|0/
// expects x, z in microns
+ */
- Float_t tanP=TMath::Tan(fStereoP);
- Float_t tanN=TMath::Tan(-fStereoN);
+ /*
+ Float_t stereoP, stereoN;
+ Angles(stereoP,stereoN);
+ Float_t tanP = TMath::Tan(stereoP);
+ Float_t tanN = TMath::Tan(-stereoN);
Float_t x1 = x;
Float_t z1 = z;
x1 += fDx/2;
z1 += fDz/2;
- x = (x1 - z1*tanP)/fPitch;
- z = (x1 - tanN*(z1 - fDz))/fPitch;
+ x = (x1 - z1*tanP)/fPitch;
+ z = (x1 - tanN*(z1 - fDz))/fPitch;
+ */
+
+ Float_t P=0;
+ Float_t N=0;
+ if(fLayer==5) {
+ P = 105.26*x - 0.79*z + 381.89;
+ N = P + 3.68*z - 4;
+ }
+ else if(fLayer==6) {
+ P = -105.26*x - 0.79*z + 384.66;
+ N = P + 3.68*z + 4;
+ }
+ else AliError("Layer can be 5 or 6");
+
+ x=P;
+ z=N;
+
}
-//-------------------------------------------------------
-void AliITSsegmentationSSD::GetPadIxz(Float_t x,Float_t z,Int_t &iP,Int_t &iN)
-{
+//----------------------------------------------------------------------
+void AliITSsegmentationSSD::GetPadIxz(Float_t x,Float_t z,Int_t &iP,Int_t &iN) const {
// returns P and N sided strip numbers for a given location.
/* _- Z
+ angle / ^
|0/
// expects x, z in microns
-/*
- Float_t tanP=TMath::Tan(fStereoP);
- Float_t tanN=TMath::Tan(fStereoN);
- //cout<<"1 segment::GetPad: xL,zL,fDx,fDz ="<<x<<","<<z<<","<<fDx<<","<<fDz<<endl;
- //cout<<"2 segment: ? tanP,tanN ="<<tanP<<","<<tanN<<endl;
- tanP = 0.0075;
- tanN = 0.0275;
+ */
+
+ Float_t stereoP, stereoN;
+ Angles(stereoP,stereoN);
+ Float_t tanP=TMath::Tan(stereoP);
+ Float_t tanN=TMath::Tan(stereoN);
Float_t x1=x,z1=z;
-// cout << "GetPadIxz::Tan(" << fStereoP << ")=" << tanP << endl;
-// cout << "GetPadIxz::Tan(" << fStereoN << ")=" << tanN << endl;
x1 += fDx/2;
z1 += fDz/2;
Float_t ldX = x1 - z1*tanP; // distance from left-down edge
-*/
- this->GetPadTxz(x,z); // use existing routine.
- iP = (Int_t) x; //(Int_t)(ldX/fPitch);
+ iP = (Int_t)(ldX/fPitch);
iP = (iP<0)? -1: iP;
iP = (iP>fNstrips)? -1: iP;
-/*
- //cout<<"3 segment::GetPad: x1,tanP,ix1 ="<<ldX<<","<<tanP<<","<<iP<<endl;
ldX = x1 - tanN*(fDz - z1);
-*/
- iN = (Int_t) z; //(Int_t)(ldX/fPitch);
+ iN = (Int_t)(ldX/fPitch);
iN = (iN<0)? -1: iN;
iN = (iN>fNstrips)? -1: iN;
- //cout<<"4 segment::GetPad: x2,tanN,ix2 ="<<ldX<<","<<tanN<<","<<iN<<endl;
-
}
//-------------------------------------------------------
-void AliITSsegmentationSSD::GetPadCxz(Int_t iP,Int_t iN,Float_t &x,Float_t &z)
-{
- // actually this is the GetCrossing(Float_t &,Float_t &)
-
- // returns x, z in microns !
-
- Float_t flag=2*fDx;
-
- Float_t tanP=TMath::Tan(fStereoP);
- Float_t tanN=TMath::Tan(fStereoN);
-
- Float_t dx = 0.1;
-// cout << "GetPadCxz::Tan(" << fStereoP << ")=" << tanP << endl;
-// cout << "GetPadCxz::Tan(" << fStereoN << ")=" << tanN << endl;
-// cout << "GetPadCxz::dx=" << dx << endl;
- x = iP*fPitch;
- z = iN*fPitch;
-
- if(tanP + tanN == 0) {x=z=flag; return ;}
+void AliITSsegmentationSSD::GetPadCxz(Int_t iP,Int_t iN,Float_t &x,Float_t &z) const {
+ // actually this is the GetCrossing(Float_t &,Float_t &)
+ // returns local x, z in microns !
- z = (z - x + tanN * fDz) / (tanP + tanN);
- x = x + tanP * z;
+ Float_t lDx = fDx; // detector size in x direction, microns
+ Float_t lDz = fDz; // detector size in z direction, microns
+ Float_t xP; // x coordinate in the P side from the first P strip
+ Float_t xN; // x coordinate in the N side from the first N strip
+ Float_t stereoP, stereoN;
+ Angles(stereoP,stereoN);
+ Float_t kP=TMath::Tan(stereoP);
+ Float_t kN=TMath::Tan(stereoN);
- x -= fDx/2;
- z -= fDz/2;
-
- if ( ( z < -(fDz/2+dx) ) || ( z > (fDz/2+dx) ) ) {x=z=flag; return ;}
- if ( ( x < -(fDx/2+dx) ) || ( x > (fDx/2+dx) ) ) {x=z=flag; return ;}
+ xP=iP*fPitch;
+ xN=iN*fPitch;
+ x = xP + kP*(lDz*kN-xP+xN)/(kP+kN);
+ z = (lDz*kN-xP+xN)/(kP+kN);
+ x -= lDx/2;
+ z -= lDz/2;
+ //if(TMath::Abs(z) > Dz/2) cout<<"Warning, wrong z local ="<<z<<endl;
+ // Check that zL is inside the detector for the
+ // correspondent xP and xN coordinates
return;
}
//______________________________________________________________________
-void AliITSsegmentationSSD::LocalToDet(Float_t x,Float_t z,
- Int_t &iP,Int_t &iN){
+Bool_t AliITSsegmentationSSD::LocalToDet(Float_t x,Float_t z,
+ Int_t &iP,Int_t &iN) const {
// Transformation from Geant cm detector center local coordinates
// to detector P and N side strip numbers..
/* _- Z
|00/
|0/
*/
- const Double_t kconst = 1.0E-04; // convert microns to cm.
-
- x /= kconst; // convert to microns
- z /= kconst; // convert to microns
- this->GetPadTxz(x,z);
-
- // first for P side
- iP = (Int_t) x;
- if(iP<0 || iP>=fNstrips) iP=-1; // strip number must be in range.
- // Now for N side)
- iN = (Int_t) z;
- if(iN<0 || iN>=fNstrips) iN=-1; // strip number must be in range.
- return;
+ Float_t dx,dz;
+ const Double_t kconst = 1.0E-04; // convert microns to cm.
+ dx = 0.5*kconst*Dx();
+ dz = 0.5*kconst*Dz();
+ if( (x<-dx) || (x>dx) ) {
+ iP=-1;
+ AliWarning(Form("Input argument %f out of range (%f, %f)",x,dx,-dx));
+ return kFALSE; // outside of defined volume.
+ } // outside x range.
+ if( (z<-dz) || (z>dz) ) {
+ iN=-1;
+ AliWarning(Form("Input argument %f out of range (%f, %f)",z,dz,-dz));
+ return kFALSE; // outside of defined volume.
+ }
+
+ //x /= kconst; // convert to microns
+ //z /= kconst; // convert to microns
+ this->GetPadTxz(x,z);
+
+ // first for P side
+ iP = (Int_t) x;
+ if(iP<0 || iP>=fNstrips) iP=-1; // strip number must be in range.
+ // Now for N side)
+ iN = (Int_t) z;
+ if(iN<0 || iN>=fNstrips) iN=-1; // strip number must be in range.
+ return kTRUE;
}
//----------------------------------------------------------------------
void AliITSsegmentationSSD::DetToLocal(Int_t ix,Int_t iPN,
- Float_t &x,Float_t &z){
+ Float_t &x,Float_t &z) const{
// Transformation from detector segmentation/cell coordiantes starting
// from 0. iPN=0 for P side and 1 for N side strip. Returned is z=0.0
// and the corresponding x value..
const Double_t kconst = 1.0E-04; // convert microns to cm.
Float_t flag=kconst*Dx(); // error value
Double_t th=0.0,dx,dz,i,a,b=0.0,xb[4],zb[4];
+ Float_t stereoP, stereoN;
+ Angles(stereoP,stereoN);
z = 0.0; // Strip center in z.
if(iPN<0 || iPN>1){// if error return full detector size in x.
- x = z = flag; return;
+ x = z = flag;
+ return;
+ } // end if
+ if(ix<0 || ix>=fNstrips) { // if error return full detector size in x.
+ x = z = flag;
+ return;
} // end if
- if(ix<0 || ix>=fNstrips) {x = z = flag; return;} // if error return full
- // detector size in x.
i = (Double_t) ix; // convert to double
dx = 0.5*kconst*Dx(); // half distance in x in cm
dz = 0.5*kconst*Dz(); // half distance in z in cm
a = kconst*Dpx(ix)*(i+0.5)-dx; // Min x value.
if(iPN==0){ //P-side angle defined backwards.
- th = TMath::Tan(fStereoP);
+ th = TMath::Tan(stereoP);
b = dz*th;
}else if(iPN==1){ // N-side
- th = TMath::Tan(-fStereoN);
+ th = TMath::Tan(-stereoN);
b = -dz*th;
} // end if
// compute average/center position of the strip.
xb[3] = a+b-dz*th; zb[3] = -dz;
x = 0.0; z = 0.0;
for(Int_t j=0;j<4;j++){
-// cout << "xb["<<j<<"]="<<xb[j]<<" zb["<<j<<"[="<<zb[j]<<endl;
if(xb[j]>=-dx && xb[j]<=dx && zb[j]>=-dz && zb[j]<=dz){
x += xb[j];
z += zb[j];
*/
const Double_t kconst = 1.0E-04; // convert microns to cm.
Double_t thp,thn,th,dx,dz,p,ip,in;
-
+ Float_t stereoP, stereoN;
+ Angles(stereoP,stereoN);
- thp = TMath::Tan(fStereoP);
- thn = TMath::Tan(-fStereoN);
+ thp = TMath::Tan(stereoP);
+ thn = TMath::Tan(-stereoN);
th = thp-thn;
if(th==0.0) { // parall strips then never cross.
x = 0.0;
in = (Double_t) iN; // convert to double now for speed
dx = 0.5*kconst*Dx(); // half distance in x in cm
dz = 0.5*kconst*Dz(); // half distance in z in cm
- p = kconst*Dpx(iP); // Get strip spacing/pitch now
+ p = kconst*Dpx(iP); // Get strip spacing/pitch now
x = 0.5*p+dx + (p*(in*thp-ip*thn)-2.0*dz*thp*thn)/th;
z =(p*(in-ip)-dz*(thp+thn))/th;
// compute correlations.
c[0][0] = -thn*p/th; // dx/diP
- c[1][1] = p/th; // dz/diN
- c[0][1] = p*thp/th; // dx/diN
- c[1][0] = -p/th; // dz/diP
+ c[1][1] = p/th; // dz/diN
+ c[0][1] = p*thp/th; // dx/diN
+ c[1][0] = -p/th; // dz/diP
if(x<-dx || x>dx || z<-dz || z>dz) return kFALSE; // crossing is outside
// of the detector so
// these strips don't
// cross.
return kTRUE;
}
+
+//----------------------------------------------------------------------
+Int_t AliITSsegmentationSSD::GetChipFromChannel(Int_t ix, Int_t iz) const {
+ // returns chip number (in range 0-11) starting from channel number
+
+ if( (iz>=fgkNstripsDefault) || (iz<0) || (ix<0) || (ix>1) ) {
+ AliError("Bad cell number");
+ return -1;
+ }
+
+ if(ix==1) iz = 1535-iz;
+ Int_t theChip =iz/fgkNstripsPerChip;
+ return theChip;
+
+}
+//----------------------------------------------------------------------
+Int_t AliITSsegmentationSSD::GetChipFromLocal(Float_t xloc, Float_t zloc) const
+{
+ // returns chip numbers starting from local coordinates
+ // The two Nside chip number and Pside chip number are
+ // coded as chip=Nchip*10+Pchip
+
+ Int_t iP=0;
+ Int_t iN=0;
+ if (!LocalToDet(xloc,zloc,iP,iN) ||
+ (iP<0) || (iP>=fNstrips) || (iN<0) || (iN>=fNstrips) ) {
+ //AliWarning("Bad local coordinate");
+ return -1;
+ }
+
+ Int_t iChip = GetChipFromChannel(0,iP);
+ iChip += 10*GetChipFromChannel(1,iN); // add Nside
+
+ return iChip;
+
+}
+//
+
+Int_t AliITSsegmentationSSD::GetChipsInLocalWindow(Int_t* array, Float_t zmin, Float_t zmax,
+ Float_t xmin, Float_t xmax) const {
+
+ Int_t nChipInW = 0;
+
+ Float_t zminDet=-fDz*1.0E-04/2.;
+ Float_t zmaxDet=fDz*1.0E-04/2.;
+ if(zmin<zminDet) zmin=zminDet;
+ if(zmax>zmaxDet) zmax=zmaxDet;
+
+ Float_t xminDet=-fDx*1.0E-04/2;
+ Float_t xmaxDet=fDx*1.0E-04/2;
+ if(xmin<xminDet) xmin=xminDet;
+ if(xmax>xmaxDet) xmax=xmaxDet;
+
+ Int_t n1N=-1;
+ Int_t n1P=-1;
+ Int_t n1=GetChipFromLocal(xmin,zmin);
+ if(n1!=-1) { // Note! Recpoint can be on the sensor but in the dead area not covered by strips!
+ n1N = (Int_t) (n1/10); // N-side chip coded as 10*chip_index
+ n1P = n1 - 10 * n1N; // P-side chip coded 0-5
+ array[nChipInW]=n1P;
+ nChipInW++;
+ array[nChipInW]=n1N;
+ nChipInW++;
+ }
+
+ Int_t n2N=-1;
+ Int_t n2P=-1;
+ Int_t n2=GetChipFromLocal(xmin,zmax);
+ if(n2!=-1) { // Note! Recpoint can be on the sensor but in the dead area not covered by strips!
+ n2N = (Int_t) (n2/10); // N-side chip coded as 10*chip_index
+ n2P = n2 - 10 * n2N; // P-side chip coded 0-5
+ if(n2P!=n1P) { array[nChipInW]=n2P; nChipInW++;}
+ if(n2N!=n1N) { array[nChipInW]=n2N; nChipInW++;}
+ }
+
+ Int_t n3N=-1;
+ Int_t n3P=-1;
+ Int_t n3=GetChipFromLocal(xmax,zmin);
+ if(n3!=-1) {
+ n3N=(Int_t) (n3/10); // N-side chip coded as 10*chip_index
+ n3P=n3 - 10 * n3N; // P-side chip coded 0-5
+ if((n3P!=n1P)&&(n3P!=n2P)) { array[nChipInW]=n3P; nChipInW++;}
+ if((n3N!=n1N)&&(n3N!=n2N)) { array[nChipInW]=n3N; nChipInW++;}
+ }
+
+ Int_t n4N=-1;
+ Int_t n4P=-1;
+ Int_t n4=GetChipFromLocal(xmax,zmax);
+ if(n4!=-1) {
+ n4N=(Int_t) (n4/10); // N-side chip coded as 10*chip_index
+ n4P=n4 - 10 * n4N; // P-side chip coded 0-5
+ if((n4P!=n1P)&&(n4P!=n2P)&&(n4P!=n3P)) { array[nChipInW]=n4P; nChipInW++;}
+ if((n4N!=n1N)&&(n4N!=n2N)&&(n4N!=n3N)) { array[nChipInW]=n4N; nChipInW++;}
+ }
+
+ return nChipInW;
+
+}
+
+//----------------------------------------------------------------------
+void AliITSsegmentationSSD::PrintDefaultParameters() const {
+// Print default values for parameters.
+// Values specified as static const data members are shown
+
+ cout<<"fgkDxDefault = "<<fgkDxDefault<<endl;
+ cout<<"fgkDzDefault = "<<fgkDzDefault<<endl;
+ cout<<"fgkDyDefault = "<<fgkDyDefault<<endl;
+ cout<<"fgkPitchDefault = "<<fgkPitchDefault<<endl;
+ cout<<"fgkNstripsDefault = "<<fgkNstripsDefault<<endl;
+}
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