const Double_t AliTPCExBExact::fgkEM=1.602176487e-19/9.10938215e-31;
const Double_t AliTPCExBExact::fgkDriftField=40.e3;
+AliTPCExBExact::AliTPCExBExact()
+ : fDriftVelocity(0),
+ fkMap(0),fkField(0),fkN(0),
+ fkNX(0),fkNY(0),fkNZ(0),
+ fkXMin(-250.),fkXMax(250.),fkYMin(-250.),fkYMax(250.),
+ fkZMin(-250.),fkZMax(250.),
+ fkNLook(0),fkLook(0) {
+ //
+ // purely for I/O
+ //
+}
+
AliTPCExBExact::AliTPCExBExact(const AliMagF *bField,
Double_t driftVelocity,
Int_t nx,Int_t ny,Int_t nz,Int_t n)
- : fkMap(0),fkField(bField),fkN(n),
+ : fDriftVelocity(driftVelocity),
+ fkMap(0),fkField(bField),fkN(n),
fkNX(nx),fkNY(ny),fkNZ(nz),
fkXMin(-250.),fkXMax(250.),fkYMin(-250.),fkYMax(250.),
- fkZMax(250.) {
+ fkZMin(-250.),fkZMax(250.),
+ fkNLook(0),fkLook(0) {
//
// The constructor. One has to supply a magnetic field and an (initial)
// drift velocity. Since some kind of lookuptable is created the
// n sets the number of integration steps to be used when integrating
// over the full drift length.
//
- fDriftVelocity=driftVelocity;
CreateLookupTable();
}
AliTPCExBExact::AliTPCExBExact(const AliFieldMap *bFieldMap,
Double_t driftVelocity,Int_t n)
- : fkMap(bFieldMap),fkField(0),fkN(n) {
+ : fDriftVelocity(driftVelocity),
+ fkMap(bFieldMap),fkField(0),fkN(n),
+ fkNX(0),fkNY(0),fkNZ(0),
+ fkXMin(-250.),fkXMax(250.),fkYMin(-250.),fkYMax(250.),
+ fkZMin(-250.),fkZMax(250.),
+ fkNLook(0),fkLook(0) {
//
// The constructor. One has to supply a field map and an (initial)
// drift velocity.
// n sets the number of integration steps to be used when integrating
// over the full drift length.
//
- fDriftVelocity=driftVelocity;
fkXMin=bFieldMap->Xmin()
-TMath::Ceil( (bFieldMap->Xmin()+250.0)/bFieldMap->DelX())
//
// destruct the poor object.
//
- delete[] fLook;
+ delete[] fkLook;
}
-void AliTPCExBExact::Correct(const Double_t *position,Double_t *corrected) {
- Double_t r=TMath::Sqrt(position[0]*position[0]+position[1]*position[1]);
- if (TMath::Abs(position[2])>250.||r<90.||250.<r) {
- for (Int_t i=0;i<3;++i) corrected[i]=position[i];
+void AliTPCExBExact::Correct(const Double_t *position, Double_t *corrected) {
+ //
+ // correct for the distortion
+ //
+ Double_t x=(position[0]-fkXMin)/(fkXMax-fkXMin)*(fkNX-1);
+ Int_t xi1=static_cast<Int_t>(x);
+ xi1=TMath::Max(TMath::Min(xi1,fkNX-2),0);
+ Int_t xi2=xi1+1;
+ Double_t dx=(x-xi1);
+ Double_t dx1=(xi2-x);
+
+ Double_t y=(position[1]-fkYMin)/(fkYMax-fkYMin)*(fkNY-1);
+ Int_t yi1=static_cast<Int_t>(y);
+ yi1=TMath::Max(TMath::Min(yi1,fkNY-2),0);
+ Int_t yi2=yi1+1;
+ Double_t dy=(y-yi1);
+ Double_t dy1=(yi2-y);
+
+ Double_t z=position[2]/fkZMax*(fkNZ-1);
+ Int_t side;
+ if (z>0) {
+ side=1;
}
else {
- Double_t x=(position[0]-fkXMin)/(fkXMax-fkXMin)*(fkNX-1);
- Int_t xi1=static_cast<Int_t>(x);
- xi1=TMath::Max(TMath::Min(xi1,fkNX-2),0);
- Int_t xi2=xi1+1;
- Double_t dx=(x-xi1);
- Double_t dx1=(xi2-x);
-
- Double_t y=(position[1]-fkYMin)/(fkYMax-fkYMin)*(fkNY-1);
- Int_t yi1=static_cast<Int_t>(y);
- yi1=TMath::Max(TMath::Min(yi1,fkNY-2),0);
- Int_t yi2=yi1+1;
- Double_t dy=(y-yi1);
- Double_t dy1=(yi2-y);
+ z=-z;
+ side=0;
+ }
+ Int_t zi1=static_cast<Int_t>(z);
+ zi1=TMath::Max(TMath::Min(zi1,fkNZ-2),0);
+ Int_t zi2=zi1+1;
+ Double_t dz=(z-zi1);
+ Double_t dz1=(zi2-z);
- Double_t z=position[2]/fkZMax*(fkNZ-1);
- Int_t side;
- if (z>0) {
- side=1;
- }
- else {
- z=-z;
- side=0;
- }
- Int_t zi1=static_cast<Int_t>(z);
- zi1=TMath::Max(TMath::Min(zi1,fkNZ-2),0);
- Int_t zi2=zi1+1;
- Double_t dz=(z-zi1);
- Double_t dz1=(zi2-z);
+ for (int i=0;i<3;++i)
+ corrected[i]
+ =fkLook[(((xi1*fkNY+yi1)*fkNZ+zi1)*2+side)*3+i]*dx1*dy1*dz1
+ +fkLook[(((xi1*fkNY+yi1)*fkNZ+zi2)*2+side)*3+i]*dx1*dy1*dz
+ +fkLook[(((xi1*fkNY+yi2)*fkNZ+zi1)*2+side)*3+i]*dx1*dy *dz1
+ +fkLook[(((xi1*fkNY+yi2)*fkNZ+zi2)*2+side)*3+i]*dx1*dy *dz
+ +fkLook[(((xi2*fkNY+yi2)*fkNZ+zi1)*2+side)*3+i]*dx *dy *dz1
+ +fkLook[(((xi2*fkNY+yi2)*fkNZ+zi2)*2+side)*3+i]*dx *dy *dz
+ +fkLook[(((xi2*fkNY+yi1)*fkNZ+zi1)*2+side)*3+i]*dx *dy1*dz1
+ +fkLook[(((xi2*fkNY+yi1)*fkNZ+zi2)*2+side)*3+i]*dx *dy1*dz ;
+ // corrected[2]=position[2];
+}
- for (int i=0;i<3;++i)
- corrected[i]
- =fLook[(((xi1*fkNY+yi1)*fkNZ+zi1)*2+side)*3+i]*dx1*dy1*dz1
- +fLook[(((xi1*fkNY+yi1)*fkNZ+zi2)*2+side)*3+i]*dx1*dy1*dz
- +fLook[(((xi1*fkNY+yi2)*fkNZ+zi1)*2+side)*3+i]*dx1*dy *dz1
- +fLook[(((xi1*fkNY+yi2)*fkNZ+zi2)*2+side)*3+i]*dx1*dy *dz
- +fLook[(((xi2*fkNY+yi2)*fkNZ+zi1)*2+side)*3+i]*dx *dy *dz1
- +fLook[(((xi2*fkNY+yi2)*fkNZ+zi2)*2+side)*3+i]*dx *dy *dz
- +fLook[(((xi2*fkNY+yi1)*fkNZ+zi1)*2+side)*3+i]*dx *dy1*dz1
- +fLook[(((xi2*fkNY+yi1)*fkNZ+zi2)*2+side)*3+i]*dx *dy1*dz ;
- // corrected[2]=position[2];
- }
+void AliTPCExBExact::TestThisBeautifulObject(const AliFieldMap *bFieldMap,
+ const char* fileName) {
+ fkMap=bFieldMap;
+ fkField=0;
+ TestThisBeautifulObjectGeneric(fileName);
+}
+
+void AliTPCExBExact::TestThisBeautifulObject(const AliMagF *bField,
+ const char* fileName) {
+ fkField=bField;
+ fkMap=0;
+ TestThisBeautifulObjectGeneric(fileName);
}
-void AliTPCExBExact::TestThisBeautifulObject(const char* fileName) {
+void AliTPCExBExact::TestThisBeautifulObjectGeneric(const char* fileName) {
//
// well, as the name sais...
//
//
// Helper function to fill the lookup table.
//
- fLook=new Double_t[fkNX*fkNY*fkNZ*2*3];
+ fkNLook=fkNX*fkNY*fkNZ*2*3;
+ fkLook=new Double_t[fkNLook];
Double_t x[3];
for (int i=0;i<fkNX;++i) {
x[0]=fkXMin+(fkXMax-fkXMin)/(fkNX-1)*i;
for (int k=0;k<fkNZ;++k) {
x[2]=1.*fkZMax/(fkNZ-1)*k;
x[2]=TMath::Max((Double_t)0.0001,x[2]); //ugly
- CalculateDistortion(x,&fLook[(((i*fkNY+j)*fkNZ+k)*2+1)*3]);
+ CalculateDistortion(x,&fkLook[(((i*fkNY+j)*fkNZ+k)*2+1)*3]);
x[2]=-x[2];
- CalculateDistortion(x,&fLook[(((i*fkNY+j)*fkNZ+k)*2+0)*3]);
+ CalculateDistortion(x,&fkLook[(((i*fkNY+j)*fkNZ+k)*2+0)*3]);
}
}
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff