// that is the base for AliTPCtrack, AliITStrackV2 and AliTRDtrack
// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
//-------------------------------------------------------------------------
-
+#include "AliTracker.h"
#include "AliKalmanTrack.h"
+#include "TGeoManager.h"
ClassImp(AliKalmanTrack)
-const AliMagF *AliKalmanTrack::fgkFieldMap=0;
-Double_t AliKalmanTrack::fgConvConst=0.;
-
//_______________________________________________________________________
AliKalmanTrack::AliKalmanTrack():
fLab(-3141593),
//
// Default constructor
//
- if (fgkFieldMap==0) {
+ if (AliTracker::GetFieldMap()==0) {
AliFatal("The magnetic field has not been set!");
- }
+ }
-
for(Int_t i=0; i<AliPID::kSPECIES; i++) fIntegratedTime[i] = 0;
+ for(Int_t i=0; i<AliPID::kSPECIES; i++) fIntegratedTime[i] = 0;
}
//_______________________________________________________________________
//
// Copy constructor
//
- if (fgkFieldMap==0) {
+ if (AliTracker::GetFieldMap()==0) {
AliFatal("The magnetic field has not been set!");
}
for(Int_t i=0; i<AliPID::kSPECIES; i++) fIntegratedTime[i] = 0;
fIntegratedLength = 0;
}
+
//_______________________________________________________________________
void AliKalmanTrack:: AddTimeStep(Double_t length)
{
}
//_______________________________________________________________________
-
Double_t AliKalmanTrack::GetIntegratedTime(Int_t pdg) const
{
// Sylwester Radomski, GSI
for (Int_t i=0; i<AliPID::kSPECIES; i++) fIntegratedTime[i]=times[i];
}
-//_______________________________________________________________________
-
-void AliKalmanTrack::PrintTime() const
-{
- // Sylwester Radomski, GSI
- // S.Radomski@gsi.de
- //
- // For testing
- // Prints time for all hypothesis
- //
-
- for (Int_t i=0; i<AliPID::kSPECIES; i++)
- printf("%d: %.2f ", AliPID::ParticleCode(i), fIntegratedTime[i]);
- printf("\n");
-}
-
void AliKalmanTrack::External2Helix(Double_t helix[6]) const {
//--------------------------------------------------------------------
// External track parameters -> helix parameters
return TMath::Sqrt(dm*TMath::Sqrt(dy2*dz2));
}
-Double_t AliKalmanTrack::
-PropagateToDCA(AliKalmanTrack *p, Double_t d, Double_t x0) {
+Double_t
+AliKalmanTrack::PropagateToDCA(AliKalmanTrack *p, Double_t d, Double_t x0) {
//--------------------------------------------------------------
// Propagates this track and the argument track to the position of the
// distance of closest approach.
return dca;
}
+
+
+
+
+Double_t AliKalmanTrack::MeanMaterialBudget(Double_t *start, Double_t *end, Double_t *mparam)
+{
+ //
+ // calculate mean material budget and material properties beween point start and end
+ // mparam - returns parameters used for dEdx and multiple scatering
+ //
+ // mparam[0] - density mean
+ // mparam[1] - rad length
+ // mparam[2] - A mean
+ // mparam[3] - Z mean
+ // mparam[4] - length
+ // mparam[5] - Z/A mean
+ // mparam[6] - number of boundary crosses
+ //
+ mparam[0]=0; mparam[1]=1; mparam[2] =0; mparam[3] =0, mparam[4]=0, mparam[5]=0; mparam[6]=0;
+ //
+ Double_t bparam[6], lparam[6]; // bparam - total param - lparam - local parameters
+ for (Int_t i=0;i<6;i++) bparam[i]=0; //
+
+ if (!gGeoManager) {
+ printf("ERROR: no TGeo\n");
+ return 0.;
+ }
+ //
+ Double_t length;
+ Double_t dir[3];
+ length = TMath::Sqrt((end[0]-start[0])*(end[0]-start[0])+
+ (end[1]-start[1])*(end[1]-start[1])+
+ (end[2]-start[2])*(end[2]-start[2]));
+ mparam[4]=length;
+ if (length<TGeoShape::Tolerance()) return 0.0;
+ Double_t invlen = 1./length;
+ dir[0] = (end[0]-start[0])*invlen;
+ dir[1] = (end[1]-start[1])*invlen;
+ dir[2] = (end[2]-start[2])*invlen;
+ // Initialize start point and direction
+ TGeoNode *currentnode = 0;
+ TGeoNode *startnode = gGeoManager->InitTrack(start, dir);
+ // printf("%s length=%f\n",gGeoManager->GetPath(),length);
+ if (!startnode) {
+ printf("ERROR: start point out of geometry\n");
+ return 0.0;
+ }
+ TGeoMaterial *material = startnode->GetVolume()->GetMedium()->GetMaterial();
+ lparam[0] = material->GetDensity();
+ lparam[1] = material->GetRadLen();
+ lparam[2] = material->GetA();
+ lparam[3] = material->GetZ();
+ lparam[4] = length;
+ lparam[5] = lparam[3]/lparam[2];
+ if (material->IsMixture()) {
+ lparam[1]*=lparam[0]; // different normalization in the modeler for mixture
+ TGeoMixture * mixture = (TGeoMixture*)material;
+ lparam[5] =0;
+ Double_t sum =0;
+ for (Int_t iel=0;iel<mixture->GetNelements();iel++){
+ sum += mixture->GetWmixt()[iel];
+ lparam[5]+= mixture->GetZmixt()[iel]*mixture->GetWmixt()[iel]/mixture->GetAmixt()[iel];
+ }
+ lparam[5]/=sum;
+ }
+ gGeoManager->FindNextBoundary(length);
+ Double_t snext = gGeoManager->GetStep();
+ Double_t step = 0.0;
+ // If no boundary within proposed length, return current density
+ if (snext>=length) {
+ for (Int_t ip=0;ip<5;ip++) mparam[ip] = lparam[ip];
+ return lparam[0];
+ }
+ // Try to cross the boundary and see what is next
+ while (length>TGeoShape::Tolerance()) {
+ mparam[6]+=1.;
+ currentnode = gGeoManager->Step();
+ step += snext+1.E-6;
+ bparam[1] += snext*lparam[1];
+ bparam[2] += snext*lparam[2];
+ bparam[3] += snext*lparam[3];
+ bparam[5] += snext*lparam[5];
+ bparam[0] += snext*lparam[0];
+
+ if (snext>=length) break;
+ if (!currentnode) break;
+ // printf("%s snext=%f density=%f bparam[0]=%f\n", gGeoManager->GetPath(),snext,density,bparam[0]);
+ if (!gGeoManager->IsEntering()) {
+ gGeoManager->SetStep(1.E-3);
+ currentnode = gGeoManager->Step();
+ if (!gGeoManager->IsEntering() || !currentnode) {
+ // printf("ERROR: cannot cross boundary\n");
+ mparam[0] = bparam[0]/step;
+ mparam[1] = bparam[1]/step;
+ mparam[2] = bparam[2]/step;
+ mparam[3] = bparam[3]/step;
+ mparam[5] = bparam[5]/step;
+ mparam[4] = step;
+ mparam[0] = 0.; // if crash of navigation take mean density 0
+ mparam[1] = 1000000; // and infinite rad length
+ return bparam[0]/step;
+ }
+ step += 1.E-3;
+ snext += 1.E-3;
+ bparam[0] += lparam[0]*1.E-3;
+ bparam[1] += lparam[1]*1.E-3;
+ bparam[2] += lparam[2]*1.E-3;
+ bparam[3] += lparam[3]*1.E-3;
+ bparam[5] += lparam[5]*1.E-3;
+ }
+ length -= snext;
+ material = currentnode->GetVolume()->GetMedium()->GetMaterial();
+ lparam[0] = material->GetDensity();
+ lparam[1] = material->GetRadLen();
+ lparam[2] = material->GetA();
+ lparam[3] = material->GetZ();
+ lparam[5] = lparam[3]/lparam[2];
+ if (material->IsMixture()) {
+ lparam[1]*=lparam[0];
+ TGeoMixture * mixture = (TGeoMixture*)material;
+ lparam[5]=0;
+ Double_t sum =0;
+ for (Int_t iel=0;iel<mixture->GetNelements();iel++){
+ sum+= mixture->GetWmixt()[iel];
+ lparam[5]+= mixture->GetZmixt()[iel]*mixture->GetWmixt()[iel]/mixture->GetAmixt()[iel];
+ }
+ lparam[5]/=sum;
+ }
+ gGeoManager->FindNextBoundary(length);
+ snext = gGeoManager->GetStep();
+ }
+ mparam[0] = bparam[0]/step;
+ mparam[1] = bparam[1]/step;
+ mparam[2] = bparam[2]/step;
+ mparam[3] = bparam[3]/step;
+ mparam[5] = bparam[5]/step;
+ return bparam[0]/step;
+
+}
+
+Double_t AliKalmanTrack::GetConvConst() {
+ return 1000/0.299792458/AliTracker::GetBz();
+}
+
+void AliKalmanTrack::SaveLocalConvConst() {
+ //---------------------------------------------------------------------
+ // Saves local conversion constant "curvature (1/cm) -> pt (GeV/c)"
+ //---------------------------------------------------------------------
+ if (AliTracker::UniformField()) {
+ fLocalConvConst=1000/0.299792458/AliTracker::GetBz();
+ } else {
+ Float_t r[3]; GetXYZ(r);
+ fLocalConvConst=1000/0.299792458/AliTracker::GetBz(r);
+ }
+}
+
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff