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SBSEArm.cxx
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SBSEArm.cxx
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//////////////////////////////////////////////////////////////////////////
//
// Bare-bones SBB BigBite spectrometer class
// Used for testing.
//
//////////////////////////////////////////////////////////////////////////
#include "SBSEArm.h"
#include "TList.h"
#include "SBSHCal.h"
#include "SBSGEMSpectrometerTracker.h"
#include "SBSGEMPolarimeterTracker.h"
#include "THaTrack.h"
#include "SBSRasteredBeam.h"
#include "THaTrackingDetector.h"
#include "TClass.h"
using namespace std;
ClassImp(SBSEArm)
//_____________________________________________________________________________
SBSEArm::SBSEArm( const char* name, const char* description ) :
THaSpectrometer( name, description )
{
// Constructor. Defines standard detectors
fOpticsOrder = -1; //default to zero for optics order. Not sure if this causes a seg fault, but safer.
SetPID( false );
fFrontConstraintWidthX.clear();
fFrontConstraintWidthY.clear();
fFrontConstraintX0.clear();
fFrontConstraintY0.clear();
fBackConstraintWidthX.clear();
fBackConstraintWidthY.clear();
fBackConstraintX0.clear();
fBackConstraintY0.clear();
//Set default values for front and back constraint centers and widths:
// the 0,1 indices are for front,back trackers for the polarimeter mode:
double xwidth_front_default[2] = { 0.75, 1.0 }; //X dimension of front and back GEMs
double xwidth_back_default[2] = { 2.0, 2.0 }; //a bit larger than HCAL size
double ywidth_front_default[2] = {0.2, 0.3 }; //Y dimension of front and back GEMs
double ywidth_back_default[2] = {1.0, 1.0}; //a bit larger than HCAL size
for( int icp=0; icp<2; icp++ ){
fFrontConstraintX0.push_back( 0.0 );
fFrontConstraintY0.push_back( 0.0 );
fBackConstraintX0.push_back( 0.0 );
fBackConstraintY0.push_back( 0.0 );
fFrontConstraintWidthX.push_back( xwidth_front_default[icp] );
fFrontConstraintWidthY.push_back( ywidth_front_default[icp] );
fBackConstraintWidthX.push_back( xwidth_back_default[icp] );
fBackConstraintWidthY.push_back( ywidth_back_default[icp] );
}
// fFrontConstraintWidthX = 1.5;
// fFrontConstraintWidthY = 1.5;
// fBackConstraintWidthX = 1.5;
// fBackConstraintWidthY = 1.5;
// fFrontConstraintX0 = 0.0;
// fFrontConstraintY0 = 0.0;
// fBackConstraintX0 = 0.0;
// fBackConstraintY0 = 0.0;
fGEMorigin.SetXYZ(0,0,0);
fGEM_Rtotal = TRotation();
fMagDist = 2.25; //This is a required parameter from ReadRunDatabase
fHCALdist = 17.0; //default 17 m (GEN setting). But mandatory in readrundb
fBdL = 1.58; // T*m (optional: calculate avg. proton deflection for pcentral)
fOpticsAngle = 0.0;
//Default to GEN-RP settings; in GEN-RP the first GEM plane is 4.105 m from the target for SBS magnet distance of 2.25 m
// fOpticsOrigin.SetXYZ( 0.0, 0.0, fMagDist + 2.025 ); //In g4sbs, the front tracker first plane starts (by default) at 2.025 m downstream of the SBS magnet front face by default (actually I'm not sure that's still true).
fOpticsOrigin.SetXYZ( 0.0, 0.0, fMagDist + 1.855 );
InitOpticsAxes( fOpticsAngle );
fGEMtheta = fOpticsAngle;
fGEMphi = 0.0*TMath::DegToRad();
fGEMorigin = fOpticsOrigin;
// InitGEMAxes( fGEMtheta, fGEMphi, fGEMorigin );
fGEMax = 0.0;
fGEMay = 0.0;
fGEMaz = 0.0;
InitGEMAxes( fGEMax, fGEMay, fGEMaz );
fPrecon_flag = 0;
fFrontConstraintX.clear();
fFrontConstraintY.clear();
fFrontConstraintZ.clear();
fBackConstraintX.clear();
fBackConstraintY.clear();
fBackConstraintZ.clear();
fb_xptar.clear();
fb_yptar.clear();
fb_ytar.clear();
fb_pinv.clear();
f_oi.clear();
f_oj.clear();
f_ok.clear();
f_ol.clear();
f_om.clear();
fb_xfp.clear();
fb_yfp.clear();
fb_xpfp.clear();
fb_ypfp.clear();
f_foi.clear();
f_foj.clear();
f_fok.clear();
f_fol.clear();
f_fom.clear();
fPolarimeterMode = false; //if true, then we are using SBS with front and rear GEM trackers.
fPolarimeterMode_DBoverride = false;
fAnalyzerZ0 = 0.0;
fUseDynamicConstraint = false;
}
//_____________________________________________________________________________
SBSEArm::~SBSEArm()
{
// Destructor
}
Int_t SBSEArm::ReadRunDatabase( const TDatime &date ){
Int_t err = THaSpectrometer::ReadRunDatabase( date );
if( err ) return err;
FILE* file = OpenRunDBFile( date );
if( !file ) return kFileError;
//Require magdist:
const DBRequest req[] = {
{ "magdist", &fMagDist, kDouble, 0, 0, 1 },
{ "hcaldist", &fHCALdist, kDouble, 0, 0, 1 },
{ nullptr }
};
err = LoadDB( file, date, req );
fclose(file);
if( err )
return kInitError;
fOpticsOrigin.SetXYZ( 0.0, 0.0, fMagDist + 2.025 );
return kOK;
}
void SBSEArm::Clear( Option_t *opt )
{
THaSpectrometer::Clear(opt);
fFrontConstraintX.clear();
fFrontConstraintY.clear();
fFrontConstraintZ.clear();
fBackConstraintX.clear();
fBackConstraintY.clear();
fBackConstraintZ.clear();
}
Int_t SBSEArm::ReadDatabase( const TDatime& date )
{
FILE* file = OpenFile( date );
if( !file ){
std::cerr << "SBSEArm::ReadDatabase(): database not found!"<< std::endl;
return kFileError;
}
std::vector<Double_t> firstgem_offset;
std::vector<Double_t> gem_angles;
std::vector<Double_t> optics_origin;
std::vector<Double_t> optics_param;
double gemthetadeg = fGEMtheta * TMath::RadToDeg();
double gemphideg = fGEMphi * TMath::RadToDeg();
double opticsthetadeg = fOpticsAngle * TMath::RadToDeg();
int polarimetermode = fPolarimeterMode ? 1 : 0;
int usedynamicconstraint = fUseDynamicConstraint ? 1 : 0;
const DBRequest request[] = {
{ "frontconstraintwidth_x", &fFrontConstraintWidthX, kDoubleV, 0, 1, 0},
{ "frontconstraintwidth_y", &fFrontConstraintWidthY, kDoubleV, 0, 1, 0},
{ "backconstraintwidth_x", &fBackConstraintWidthX, kDoubleV, 0, 1, 0},
{ "backconstraintwidth_y", &fBackConstraintWidthY, kDoubleV, 0, 1, 0},
{ "frontconstraint_x0", &fFrontConstraintX0, kDoubleV, 0, 1, 0},
{ "frontconstraint_y0", &fFrontConstraintY0, kDoubleV, 0, 1, 0},
{ "backconstraint_x0", &fBackConstraintX0, kDoubleV, 0, 1, 0},
{ "backconstraint_y0", &fBackConstraintY0, kDoubleV, 0, 1, 0},
{ "gemorigin_xyz", &firstgem_offset, kDoubleV, 0, 1, 1},
{ "gemangles_xyz", &gem_angles, kDoubleV, 0, 1, 1},
{ "gemtheta", &gemthetadeg, kDouble, 0, 1, 1},
{ "gemphi", &gemphideg, kDouble, 0, 1, 1},
{ "opticstheta", &opticsthetadeg, kDouble, 0, 1, 1},
{ "optics_origin", &optics_origin, kDoubleV, 0, 1, 1},
{ "optics_order", &fOpticsOrder, kInt, 0, 1, 1},
{ "optics_parameters", &optics_param, kDoubleV, 0, 1, 1},
{ "preconflag", &fPrecon_flag, kUInt, 0, 1, 1 },
{ "polarimetermode", &polarimetermode, kInt, 0, 1, 1 },
{ "z0analyzer", &fAnalyzerZ0, kDouble, 0, 1, 1 },
{ "BdL", &fBdL, kDouble, 0, 1, 1 },
{ "usedynamicconstraint", &usedynamicconstraint, kInt, 0, 1, 1},
{ "dynamicthslope", &fDynamicConstraintSlopeX, kDouble, 0, 1, 1},
{ "dynamicth0", &fDynamicConstraintOffsetX, kDouble, 0, 1, 1},
{ "dynamicphslope", &fDynamicConstraintSlopeY, kDouble, 0, 1, 1},
{ "dynamicph0", &fDynamicConstraintOffsetY, kDouble, 0, 1, 1},
{0}
};
Int_t status = LoadDB( file, date, request, fPrefix, 1 ); //The "1" after fPrefix means search up the tree
fclose(file);
if( status != 0 ){
return status;
}
if( !fPolarimeterMode_DBoverride ){
fPolarimeterMode = (polarimetermode != 0);
}
// std::cout << "SBSEArm::ReadDatabase: polarimeter mode = " << fPolarimeterMode
// << std::endl;
//Once we parse the database, we need to check whether the constraint centering and width parameters
//wered defined sensibly. This method checks, and if any are not sensibly initialized, ALL are
//initialized with sensible default values:
CheckConstraintOffsetsAndWidths();
fUseDynamicConstraint = ( usedynamicconstraint != 0 );
fOpticsAngle = opticsthetadeg * TMath::DegToRad();
if( optics_origin.size() == 3 ){ //database overrides default values:
fOpticsOrigin.SetXYZ( optics_origin[0],
optics_origin[1],
optics_origin[2] );
}
InitOpticsAxes( fOpticsAngle );
fGEMtheta = gemthetadeg * TMath::DegToRad();
fGEMphi = gemphideg * TMath::DegToRad();
if( firstgem_offset.size() == 3 ){
fGEMorigin.SetXYZ( firstgem_offset[0],
firstgem_offset[1],
firstgem_offset[2] );
}
InitGEMAxes( fGEMtheta, fGEMphi );
//If GEM x,y,z angles are given, override the version based on theta, phi:
if( gem_angles.size() == 3 ){
//for( int i=0; i<3; i++ ){
// gem_angles[i] *= TMath::DegToRad();
//}
fGEMax = gem_angles[0] * TMath::DegToRad();
fGEMay = gem_angles[1] * TMath::DegToRad();
fGEMaz = gem_angles[2] * TMath::DegToRad();
InitGEMAxes( fGEMax, fGEMay, fGEMaz );
}
//Optics model initialization (copy of BigBite for now):
if(fOpticsOrder>=0){
unsigned int nterms = 0;
for(int i = 0; i<=fOpticsOrder; i++){ //x
for( int j=0; j<=fOpticsOrder-i; j++){ //y
for( int k=0; k<=fOpticsOrder-i-j; k++){
for( int l=0; l<=fOpticsOrder-i-j-k; l++){
for( int m=0; m<=fOpticsOrder-i-j-k-l; m++ ){
nterms++;
}
}
}
}
}
cout << nterms << " lines of parameters expected for optics of order " << fOpticsOrder << endl;
//int n_elem = TMath::FloorNint(optics_param.size()/nparam);
//we expect 9 parameters per line: four coefficients plus five exponents:
unsigned int nparams = 9*nterms;
if(nparams!=optics_param.size()){
std::cerr << "Warning: mismatch between " << optics_param.size()
<< " optics parameters provided and " << nparams*9
<< " optics parameters expected!" << std::endl;
std::cerr << " Fix database! " << std::endl;
return kInitError;
}
//int o_i, o_j, o_k, o_l, o_m;// shall we use those???
fb_xptar.resize(nterms);
fb_yptar.resize(nterms);
fb_ytar.resize(nterms);
fb_pinv.resize(nterms);
f_oi.resize(nterms);
f_oj.resize(nterms);
f_ok.resize(nterms);
f_ol.resize(nterms);
f_om.resize(nterms);
for(unsigned int i=0; i<nterms; i++){
fb_xptar[i] = optics_param[9*i];
fb_yptar[i] = optics_param[9*i+1];
fb_ytar[i] = optics_param[9*i+2];
fb_pinv[i] = optics_param[9*i+3];
f_om[i] = int(optics_param[9*i+4]);
f_ol[i] = int(optics_param[9*i+5]);
f_ok[i] = int(optics_param[9*i+6]);
f_oj[i] = int(optics_param[9*i+7]);
f_oi[i] = int(optics_param[9*i+8]);
}
}
fIsInit = true;
return kOK;
}
Int_t SBSEArm::DefineVariables( EMode mode ){
THaSpectrometer::DefineVariables(mode);
if( mode == kDefine and fIsSetup ) return kOK;
fIsSetup = ( mode == kDefine );
RVarDef constraintvars[] = {
{ "x_fcp", "front track constraint x", "fFrontConstraintX" },
{ "y_fcp", "front track constraint y", "fFrontConstraintY" },
{ "z_fcp", "front track constraint z", "fFrontConstraintZ" },
{ "x_bcp", "back track constraint x", "fBackConstraintX" },
{ "y_bcp", "back track constraint y", "fBackConstraintY" },
{ "z_bcp", "back track constraint z", "fBackConstraintZ" },
{ nullptr }
};
DefineVarsFromList( constraintvars, mode );
RVarDef hcalanglevars[] = {
{ "HCALth_n", "xHCAL/HCALdist", "fHCALtheta_n" },
{ "HCALph_n", "yHCAL/HCALdist", "fHCALphi_n" },
{ "HCALdir_x", "x component of HCAL unit vector", "fHCALdir_x" },
{ "HCALdir_y", "y component of HCAL unit vector", "fHCALdir_y" },
{ "HCALdir_z", "z component of HCAL unit vector", "fHCALdir_z" },
{ nullptr }
};
DefineVarsFromList( hcalanglevars, mode );
return 0;
}
//_____________________________________________________________________________
Int_t SBSEArm::FindVertices( TClonesArray &tracks )
{
// Reconstruct target coordinates for all tracks found.
// TODO
//std::cout << "SBSBigBite::FindVertices()...";
// Reconstruct target coordinates for all tracks found.
Int_t n_trk = tracks.GetLast()+1;
for( Int_t t = 0; t < n_trk; t++ ) {
auto* theTrack = static_cast<THaTrack*>( tracks.At(t) );
CalcOpticsCoords(theTrack);
if(fOpticsOrder>=0)CalcTargetCoords(theTrack);
}
if( GetNTracks() > 0 ) {
// Select first track in the array. If there is more than one track
// and track sorting is enabled, then this is the best fit track
// (smallest chi2/ndof). Otherwise, it is the track with the best
// geometrical match (smallest residuals) between the U/V clusters
// in the upper and lower VDCs (old behavior).
//
// Chi2/dof is a well-defined quantity, and the track selected in this
// way is immediately physically meaningful. The geometrical match
// criterion is mathematically less well defined and not usually used
// in track reconstruction. Hence, chi2 sorting is preferable, albeit
// obviously slower.
fGoldenTrack = static_cast<THaTrack*>( fTracks->At(0) );
fTrkIfo = *fGoldenTrack;
fTrk = fGoldenTrack;
} else {
fGoldenTrack = nullptr;
}
return 0;
}
void SBSEArm::CalcOpticsCoords( THaTrack* track )
{
Double_t x_fp, y_fp, xp_fp, yp_fp;
//Double_t px, py, pz;// NB: not the actual momentum!
x_fp = track->GetX();
y_fp = track->GetY();
xp_fp = track->GetTheta();
yp_fp = track->GetPhi();
TVector3 TrackPosLocal_GEM( x_fp, y_fp, 0.0 );
//std::cout << "calculating optics coordinates: (xfp,yfp,xpfp,ypfp)=(" << x_fp << ", " << y_fp << ", " << xp_fp << ", " << yp_fp << ")" << std::endl;
TVector3 TrackPosGlobal_GEM = fGEMorigin + TrackPosLocal_GEM.X() * fGEMxaxis_global + TrackPosLocal_GEM.Y() * fGEMyaxis_global + TrackPosLocal_GEM.Z() * fGEMzaxis_global;
//std::cout << "Track pos global = " << endl;
//TrackPosGlobal_GEM.Print();
TVector3 TrackDirLocal_GEM( xp_fp, yp_fp, 1.0 );
TrackDirLocal_GEM = TrackDirLocal_GEM.Unit();
// std::cout << "Track direction local = " << endl;
// TrackDirLocal_GEM.Print();
//TVector3 TrackDirGlobal_GEM = TrackDirLocal_GEM.X() * fGEMxaxis_global + TrackDirLocal_GEM.Y() * fGEMyaxis_global + TrackDirLocal_GEM.Z() * fGEMzaxis_global;
//TrackDirGlobal_GEM = TrackDirGlobal_GEM.Unit(); //Likely unnecessary, but safer (I guess)
TVector3 TrackDirGlobal_GEM = fGEM_Rinverse * TrackDirLocal_GEM;
// std::cout << "Track direction global = " << endl;
//TrackDirGlobal_GEM.Print();
//Now project track to the z = 0 plane of the ideal optics system:
// recall the formula to intersect a ray with a plane:
// (x + s * trackdir - x0) dot planedir = 0.0
double sintersect = (fOpticsOrigin - TrackPosGlobal_GEM).Dot(fOpticsZaxis_global)/ (TrackDirGlobal_GEM.Dot( fOpticsZaxis_global ) );
TVector3 TrackIntersect_global = TrackPosGlobal_GEM + sintersect * TrackDirGlobal_GEM;
// std::cout << "Track intersection point, global = " << endl;
//TrackIntersect_global.Print();
//rather than modifying the x, y, theta, phi directly, let's use the RX, RY, RTheta, and RPhi coordinates:
//TVector3 TrackIntersect_ = TrackIntersect_global - fOpticsOrigin;
double xoptics = (TrackIntersect_global - fOpticsOrigin).Dot( fOpticsXaxis_global );
double yoptics = (TrackIntersect_global - fOpticsOrigin).Dot( fOpticsYaxis_global );
double xpoptics = TrackDirGlobal_GEM.Dot( fOpticsXaxis_global )/TrackDirGlobal_GEM.Dot( fOpticsZaxis_global );
double ypoptics = TrackDirGlobal_GEM.Dot( fOpticsYaxis_global )/TrackDirGlobal_GEM.Dot( fOpticsZaxis_global );
//std::cout << "GEM origin = " << std::endl;
//fGEMorigin.Print();
//std::cout << "Optics origin = " << std::endl;
//fOpticsOrigin.Print();
//std::cout << "GEM z axis global = " << std::endl;
//fGEMzaxis_global.Print();
//std::cout << "Optics z axis global = " << std::endl;
//fOpticsZaxis_global.Print();
//std::cout << "GEM (x,y,xp,yp) = " << x_fp << ", " << y_fp << ", " << xp_fp << ", " << yp_fp << std::endl;
// std::cout << "Optics (x,y,xp,yp) = " << xoptics << ", " << yoptics << ", " << xpoptics << ", " << ypoptics << endl;
track->SetR( xoptics, yoptics, xpoptics, ypoptics );
//The following line is no longer necessary as we are using the "Rotated TRANSPORT coordinates" to store the track parameters in ideal optics system
//track->Set(x_fp, y_fp, xp_fp, yp_fp);
}
void SBSEArm::CalcTargetCoords( THaTrack* track )
{
//std::cout << "SBSBigBite::CalcTargetCoords()...";
//const double //make it configurable
const double th_sbs = GetThetaGeo();//retrieve the actual angle
//th_sbs < 0 for beam right... this makes SBS_zaxis along -x
TVector3 SBS_zaxis( sin(th_sbs), 0, cos(th_sbs) );
TVector3 SBS_xaxis(0,-1,0);
TVector3 SBS_yaxis = (SBS_zaxis.Cross(SBS_xaxis)).Unit();
TVector3 spec_xaxis_fp,spec_yaxis_fp, spec_zaxis_fp;
TVector3 spec_xaxis_tgt,spec_yaxis_tgt, spec_zaxis_tgt;
spec_xaxis_tgt = SBS_xaxis;
spec_yaxis_tgt = SBS_yaxis;
spec_zaxis_tgt = SBS_zaxis;
spec_zaxis_fp = SBS_zaxis;
spec_yaxis_fp = SBS_yaxis;
spec_zaxis_fp.Rotate(-fOpticsAngle, spec_yaxis_fp);
spec_xaxis_fp = spec_yaxis_fp.Cross(spec_zaxis_fp).Unit();
Double_t x_fp, y_fp, xp_fp, yp_fp;
//if( fCoordType == kTransport ) {
if( track->HasRot() ){
// std::cout << "using rotated track coordinates for optics: " << endl;
x_fp = track->GetRX();
y_fp = track->GetRY();
xp_fp = track->GetRTheta();
yp_fp = track->GetRPhi();
} else {
//std::cout << "using non-rotated track coordinates for optics: " << endl;
x_fp = track->GetX();
y_fp = track->GetY();
xp_fp = track->GetTheta();
yp_fp = track->GetPhi();
}
//}
//cout << x_fp << " " << y_fp << " " << xp_fp << " " << yp_fp << endl;
double /*vx, vy, vz, */px, py, pz;
double p_fit, xptar_fit, yptar_fit, ytar_fit, xtar;
xtar = 0.0;
double thetabend_fit;
double pthetabend_fit;
double vz_fit;
xptar_fit = 0.0;
yptar_fit = 0.0;
ytar_fit = 0.0;
pthetabend_fit = 0.0;
int ipar = 0;
for(int i=0; i<=fOpticsOrder; i++){
for(int j=0; j<=fOpticsOrder-i; j++){
for(int k=0; k<=fOpticsOrder-i-j; k++){
for(int l=0; l<=fOpticsOrder-i-j-k; l++){
for(int m=0; m<=fOpticsOrder-i-j-k-l; m++){
double term = pow(x_fp,m)*pow(y_fp,l)*pow(xp_fp,k)*pow(yp_fp,j)*pow(xtar,i);
xptar_fit += fb_xptar[ipar]*term;
yptar_fit += fb_yptar[ipar]*term;
ytar_fit += fb_ytar[ipar]*term;
pthetabend_fit += fb_pinv[ipar]*term;
//pinv_fit += b_pinv(ipar)*term;
// cout << ipar << " " << term << " "
// << b_xptar(ipar) << " " << b_yptar(ipar) << " "
// << b_ytar(ipar) << " " << b_pinv(ipar) << endl;
ipar++;
}
}
}
}
}
TVector3 phat_tgt_fit(xptar_fit, yptar_fit, 1.0 );
phat_tgt_fit = phat_tgt_fit.Unit();
TVector3 phat_fp(xp_fp, yp_fp, 1.0 );
phat_fp = phat_fp.Unit();
TVector3 phat_fp_rot = phat_fp.X() * fOpticsXaxis_global +
phat_fp.Y() * fOpticsYaxis_global +
phat_fp.Z() * fOpticsZaxis_global;
thetabend_fit = acos( phat_fp_rot.Dot( phat_tgt_fit ) );
// TVector3 phat_tgt_fit_global = phat_tgt_fit.X() * spec_xaxis_tgt +
// phat_tgt_fit.Y() * spec_yaxis_tgt +
// phat_tgt_fit.Z() * spec_zaxis_tgt;
// TVector3 phat_fp_fit(xp_fp, yp_fp, 1.0 );
// phat_fp_fit = phat_fp_fit.Unit();
// TVector3 phat_fp_fit_global = phat_fp_fit.X() * spec_xaxis_fp +
// phat_fp_fit.Y() * spec_yaxis_fp +
// phat_fp_fit.Z() * spec_zaxis_fp;
//thetabend_fit = acos( phat_fp_fit_global.Dot( phat_tgt_fit_global ) );
//if( fPrecon_flag != 1 ){
p_fit = pthetabend_fit/thetabend_fit;
//} else {
//double delta = pthetabend_fit;
//double p_firstorder = fA_pth1 * ( 1.0 + (fB_pth1 + fC_pth1*fMagDist)*xptar_fit ) / thetabend_fit;
//p_fit = p_firstorder * (1.0 + delta);
//}
//For SBS, which is on beam right, we have ytar = vz * sin(|theta|) - yptar * vz * cos(theta)
// i.e., ytar = vz * ( sin(|theta|) - yptar * cos(theta) )
// --> vz = ytar/(sin(|theta|) - yptar * cos(theta) )
// But this is the same thing as -ytar/(sin(-|theta|) + yptar * cos(theta))
// So ASSUMING th_sbs < 0 for beam right, the formula below can be used unchanged:
vz_fit = -ytar_fit / (sin(th_sbs) + cos(th_sbs)*yptar_fit);
pz = p_fit*sqrt( 1.0/(xptar_fit*xptar_fit+yptar_fit*yptar_fit+1.) );
px = xptar_fit * pz;
py = yptar_fit * pz;
TVector3 pvect_SBS = TVector3(px, py, pz);
//In SBS transport coordinates, py is toward small angles, px is vertically down (toward the floor), pz is along spectrometer central axis. To translate to HALL coordinates, we have:
// x to beam left, y vertically up, and z along the beam direction:
//since th_sbs < 0 for beam right, the formula below can be used unchanged (I think):
px = +pvect_SBS.Z()*sin(th_sbs)+pvect_SBS.Y()*cos(th_sbs);
py = -pvect_SBS.X();
pz = pvect_SBS.Z()*cos(th_sbs)-pvect_SBS.Y()*sin(th_sbs);
//We should move this to before the optics calculations in case we want to actually correct the optics for the beam position:
double ybeam=0.0,xbeam=0.0;
//retrieve beam position, if available, to calculate xtar.
TIter aiter(gHaApps);
THaApparatus* app = 0;
while( (app=(THaApparatus*)aiter()) ){
if(app->InheritsFrom("SBSRasteredBeam")){
SBSRasteredBeam* RasterBeam = reinterpret_cast<SBSRasteredBeam*>(app);
//double xbeam = RasterBeam->GetPosition().X();
ybeam = RasterBeam->GetPosition().Y()/1000.0; //if this is given in mm, we need to convert to meters (also for BB)
xbeam = RasterBeam->GetPosition().X()/1000.0;
xtar = - ybeam - cos(GetThetaGeo()) * vz_fit * xptar_fit;
}
//cout << var->GetName() << endl;
}
// f_xtg_exp.push_back(xtar);
track->SetTarget(xtar, ytar_fit, xptar_fit, yptar_fit);
track->SetMomentum(p_fit);
track->SetPvect(TVector3(px, py, pz));
track->SetVertex(TVector3(xbeam, ybeam, vz_fit));
//cout << px << " " << py << " " << pz << " " << vz_fit << endl;
//cout << track->GetLabPx() << " " << track->GetLabPy() << " " << track->GetLabPz()
// << " " << track->GetVertexZ() << endl;
//std::cout << "Done." << std::endl;
}
//_____________________________________________________________________________
Int_t SBSEArm::TrackCalc()
{
// Additioal track calculations
// TODO
return 0;
}
//_____________________________________________________________________________
Int_t SBSEArm::CoarseTrack()
{
// Coarse track Reconstruction
// std::cout << " SBSEArm::CoarseTrack()..." << std::endl;
// if( !fTrackingDetectors ) {
// cerr << "fTrackingDetectors == NULL?" << endl;
// exit(1);
// }
// cout << fTrackingDetectors->IsA()->GetName() << endl;
// fTrackingDetectors->Print();
// std::cout << " fTrackingDetectors->Print() invoked..." << std::endl;
THaSpectrometer::CoarseTrack();
// TODO
//std::cout << " call SBSBigBite::CoarseTrack" << std::endl;
//std::cout << "done" << std::endl;
return 0;
}
Int_t SBSEArm::CoarseReconstruct()
{
// std::cout << "SBSArm::CoarseReconstruct(): polarimeter mode = "
// << fPolarimeterMode << std::endl;
fHCALtheta_n = kBig;
fHCALphi_n = kBig;
fHCALdir_x = kBig;
fHCALdir_y = kBig;
fHCALdir_z = kBig;
THaSpectrometer::CoarseReconstruct();
Double_t x_fcp = 0, y_fcp = 0, z_fcp = 0;
Double_t x_bcp = 0, y_bcp = 0, z_bcp = 0;
TIter next( fNonTrackingDetectors );
//Loop on non-tracking detectors and grab pointers to HCAL and PolarimeterTracker (if it exists):
SBSHCal *HCal = nullptr;
SBSGEMPolarimeterTracker *BackTracker = nullptr;
//Loop on tracking detectors and grab pointer to SBSGEMSpectrometerTracker (if it exists):
SBSGEMSpectrometerTracker *FrontTracker = nullptr;
while( auto* theNonTrackDetector =
static_cast<THaNonTrackingDetector*>( next() )) {
if(theNonTrackDetector->InheritsFrom("SBSHCal")){
HCal = reinterpret_cast<SBSHCal*>(theNonTrackDetector);
}
if(theNonTrackDetector->InheritsFrom("SBSGEMPolarimeterTracker")){
BackTracker = reinterpret_cast<SBSGEMPolarimeterTracker*>(theNonTrackDetector);
}
}
TIter next2( fTrackingDetectors );
while( auto* theTrackDetector =
static_cast<THaTrackingDetector*>( next2() )) {
if(theTrackDetector->InheritsFrom("SBSGEMSpectrometerTracker")){
FrontTracker = reinterpret_cast<SBSGEMSpectrometerTracker*>(theTrackDetector);
// std::cout << "Got front tracker, name = " << FrontTracker->GetName()
// << std::endl;
}
}
if(HCal->GetNclust() == 0 || HCal == nullptr) return 0; //If no HCAL clusters, we don't attempt tracking
std::vector<SBSCalorimeterCluster*> HCalClusters = HCal->GetClusters();
int i_max = 0;
double E_max = 0;
for(unsigned int i = 0; i<HCalClusters.size(); i++){
if(HCalClusters[i]->GetE() > E_max){
i_max = i;
E_max = HCalClusters[i]->GetE();
}
}
x_bcp = HCalClusters[i_max]->GetX() + HCal->GetOrigin().X();
y_bcp = HCalClusters[i_max]->GetY() + HCal->GetOrigin().Y();
z_bcp = HCal->GetOrigin().Z();
fHCALtheta_n = HCalClusters[i_max]->GetX()/fHCALdist;
fHCALphi_n = HCalClusters[i_max]->GetY()/fHCALdist;
TVector3 HCALdir_global;
TransportToLab( 1.0, fHCALtheta_n, fHCALphi_n, HCALdir_global );
fHCALdir_x = HCALdir_global.X();
fHCALdir_y = HCALdir_global.Y();
fHCALdir_z = HCALdir_global.Z();
//x_fcp = fGEMorigin.X();
//y_fcp = fGEMorigin.Y();
//z_fcp = fGEMorigin.Z();
x_fcp = 0.0;
y_fcp = 0.0;
z_fcp = 0.0;
//Set constraint points for FT and BT, regardless
//whether those detectors are actually using the constraints:
if( !fPolarimeterMode && FrontTracker != nullptr ){
//std::cout << "setting constraints for tracks" << std::endl;
FrontTracker->SetBackConstraintPoint(x_bcp + fBackConstraintX0[0], y_bcp + fBackConstraintY0[0], z_bcp);
if ( fUseDynamicConstraint ){
double thcp = fDynamicConstraintSlopeX * (x_bcp + fBackConstraintX0[0]) + fDynamicConstraintOffsetX;
double phcp = fDynamicConstraintSlopeY * (y_bcp + fBackConstraintY0[0]) + fDynamicConstraintOffsetY;
x_fcp = x_bcp + thcp * (z_fcp - z_bcp);
y_fcp = y_bcp + phcp * (z_fcp - z_bcp);
}
FrontTracker->SetFrontConstraintPoint(x_fcp + fFrontConstraintX0[0], y_fcp + fFrontConstraintY0[0], z_fcp);
FrontTracker->SetFrontConstraintWidth(fFrontConstraintWidthX[0],
fFrontConstraintWidthY[0]);
FrontTracker->SetBackConstraintWidth(fBackConstraintWidthX[0],
fBackConstraintWidthY[0]);
if( BackTracker != nullptr ){
// IF there is a back tracker, and we're not using polarimeter mode,
// initialize it with identical constraints as the front:
BackTracker->SetBackConstraintPoint(x_bcp + fBackConstraintX0[0], y_bcp + fBackConstraintY0[0], z_bcp);
BackTracker->SetFrontConstraintPoint(x_fcp + fFrontConstraintX0[0], y_fcp + fFrontConstraintY0[0], z_fcp);
BackTracker->SetFrontConstraintWidth(fFrontConstraintWidthX[0],
fFrontConstraintWidthY[0]);
BackTracker->SetBackConstraintWidth(fBackConstraintWidthX[0],
fBackConstraintWidthY[0]);
}
} else if( fPolarimeterMode && BackTracker != nullptr ){ //Polarimeter mode: look for NonTrackingDetectors inheriting SBSGEMPolarimeterTracker
z_fcp = fAnalyzerZ0;
BackTracker->SetBackConstraintPoint( x_bcp + fBackConstraintX0[1], y_bcp + fBackConstraintY0[1], z_bcp);
if ( fUseDynamicConstraint ){
double thcp = fDynamicConstraintSlopeX * (x_bcp + fBackConstraintX0[1]) + fDynamicConstraintOffsetX;
double phcp = fDynamicConstraintSlopeY * (y_bcp + fBackConstraintY0[1]) + fDynamicConstraintOffsetY;
x_fcp = x_bcp + thcp * (z_fcp - z_bcp);
y_fcp = y_bcp + phcp * (z_fcp - z_bcp);
}
BackTracker->SetFrontConstraintPoint( x_fcp + fFrontConstraintX0[1], y_fcp + fFrontConstraintY0[1], z_fcp);
BackTracker->SetFrontConstraintWidth( fFrontConstraintWidthX[1],
fFrontConstraintWidthY[1] );
BackTracker->SetBackConstraintWidth( fBackConstraintWidthX[1],
fBackConstraintWidthY[1] );
//We can envision a scenario in which we get to this point and the
//front tracking is already done, for example, if the front tracking is
// done without constraints and was already done in SBSEArm::CoarseTrack, but the
// back tracking is to be done WITH constraints
// In that case, we actually want to set the back tracking constraints based on
// the FRONT tracking results:
if( FrontTracker != nullptr ){
//std::cout << "N front tracks = " << FrontTracker->GetNtracks() << std::endl;
if( FrontTracker->GetNtracks() > 0 ){
BackTracker->SetFrontTrack( FrontTracker->GetXTrack( 0 ),
FrontTracker->GetYTrack( 0 ),
FrontTracker->GetXpTrack( 0 ),
FrontTracker->GetYpTrack( 0 ) );
//Additionally set front constraint point for back tracker based on projection to analyzer (in this context z_fcp = fAnalyzerZ0):
// If this context is relevant; e.g., front tracking done without constraints
// and back tracking done with constraints, then
// the front constraint width should have also been sensibly defined via the DB:
x_fcp = FrontTracker->GetXTrack(0) + z_fcp * FrontTracker->GetXpTrack(0);
y_fcp = FrontTracker->GetYTrack(0) + z_fcp * FrontTracker->GetYpTrack(0);
BackTracker->SetFrontConstraintPoint( x_fcp + fFrontConstraintX0[1], y_fcp + fFrontConstraintY0[1], z_fcp );
}
}
} //End if (!Polarimeter mode )
fFrontConstraintX.push_back( x_fcp );
fFrontConstraintY.push_back( y_fcp );
fFrontConstraintZ.push_back( z_fcp );
fBackConstraintX.push_back( x_bcp );
fBackConstraintY.push_back( y_bcp );
fBackConstraintZ.push_back( z_bcp );
return 0;
}
//_____________________________________________________________________________
Int_t SBSEArm::Track()
{
//std::cout << "SBSEArm::Track(): polarimeter mode = " << fPolarimeterMode << std::endl;
// Fine track Reconstruction
if( !fPolarimeterMode ){ //Call regular spectrometer Track() method
THaSpectrometer::Track();
} else { //Polarimeter mode: Do back tracker tracking first:
//Grab pointer to back tracker, do tracking there, then initialize front tracker constraints, and do tracking there too:
if( !IsDone(kCoarseRecon) )
CoarseReconstruct();
// std::cout << "Number of tracking detectors assigned to this EArm = "
// << fTrackingDetectors->GetSize() << std::endl;
SBSGEMSpectrometerTracker *FrontTracker = nullptr;
TIter next2( fTrackingDetectors );
while( auto* theTrackDetector =
static_cast<THaTrackingDetector*>( next2() )) {
assert(dynamic_cast<THaTrackingDetector*>(theTrackDetector));
// std::cout << "Got tracking detector, name = "
// << theTrackDetector->GetName() << std::endl;
if(theTrackDetector->InheritsFrom("SBSGEMSpectrometerTracker")){
FrontTracker = reinterpret_cast<SBSGEMSpectrometerTracker*>(theTrackDetector);
//std::cout << "Got Front tracker, name = " << FrontTracker->GetName() << std::endl;
}
}
SBSGEMPolarimeterTracker *BackTracker = nullptr;
TIter next(fNonTrackingDetectors);
while( auto* theNonTrackDetector =
static_cast<THaNonTrackingDetector*>( next() )) {
assert(dynamic_cast<THaNonTrackingDetector*>(theNonTrackDetector));
#ifdef WITH_DEBUG
if( fDebug>1 ) cout << "Call FineProcess() for "
<< theNonTrackDetector->GetName() << "... ";
#endif
//only call fine process if this non-tracking detector is the back tracker:
if( theNonTrackDetector->InheritsFrom("SBSGEMPolarimeterTracker")){
//If the back tracker is set to use the constraints, then this
//will initiate tracking.
//Otherwise, it does nothing:
theNonTrackDetector->FineProcess( *fTracks );
//grab pointer to Back Tracker for initialization of front tracking:
BackTracker = reinterpret_cast<SBSGEMPolarimeterTracker*>(theNonTrackDetector);
}
}
//Only attempt tracking in FT if we got a track in back tracker:
if( BackTracker != nullptr && FrontTracker != nullptr ){ //Use the back tracker to initialize constraints for front tracker:
// std::cout << "Back tracker n tracks found = " << BackTracker->GetNtracks()
// << std::endl;
if( BackTracker->GetNtracks() > 0 ){
//Initially, let's set up a front constraint using only the "best" (first) track found in the back tracker
//Later, we may consider multiple tracks pointing to multiple clusters in HCAL:
// std::cout << "Back tracker has tracks, initializing front tracker: "
// << std::endl;
double xback = BackTracker->GetXTrack( 0 );
double yback = BackTracker->GetYTrack( 0 );
double xpback = BackTracker->GetXpTrack( 0 );
double ypback = BackTracker->GetYpTrack( 0 );
double x_bcp = xback + xpback * fAnalyzerZ0;
double y_bcp = yback + ypback * fAnalyzerZ0;
// std::cout << "(xbcp,ybcp,zbcp)=(" << x_bcp << ", " << y_bcp
// << ", " << fAnalyzerZ0 << ")" << std::endl;
FrontTracker->SetBackConstraintPoint( x_bcp + fBackConstraintX0[0], y_bcp + fBackConstraintY0[0], fAnalyzerZ0 );
//Set front constraint point to position of back track at front layer:
double x_fcp = xback;
double y_fcp = yback;
FrontTracker->SetFrontConstraintPoint( x_fcp + fFrontConstraintX0[0], y_fcp + fFrontConstraintY0[0], 0.0 );
// std::cout << "(xfcp,yfcp,zfcp)=(" << x_fcp << ", " << y_fcp << ",0)"
// << std::endl;
FrontTracker->SetBackConstraintWidth( fBackConstraintWidthX[0], fBackConstraintWidthY[0] );
FrontTracker->SetFrontConstraintWidth( fFrontConstraintWidthX[0], fFrontConstraintWidthY[0] );
//NOTE: if constraints aren't being used by the front tracker,
//then the following line has no effect (as intended!)
FrontTracker->FineTrack( *fTracks );
if( FrontTracker->GetNtracks() > 0 ){
//If we found a front track, then set the "front track" for the back tracker
//for the purpose of scattering angle/closest-approach reconstruction:
BackTracker->SetFrontTrack( FrontTracker->GetXTrack( 0 ),
FrontTracker->GetYTrack( 0 ),
FrontTracker->GetXpTrack( 0 ),
FrontTracker->GetYpTrack( 0 ) );
// Technically, we could also call BackTracker->CalcScatteringParameters here,
// But given the current structure of the SBSEArm code, it is unnecessary
// since BackTracker->FineProcess will get called again in SBSEArm::Reconstruct();
}
}
}
// Don't forget to call FindVertices regardless! This is NOT done automatically
// in the polarimeter mode, for which we override the standard
// THaSpectrometer::Track();
// Reconstruct tracks to target/vertex
// This usually also determines the track momentum
FindVertices( *fTracks );
} //end check for "polarimeter mode"
fStagesDone |= kTracking;
return 0;
}
//_____________________________________________________________________________
Int_t SBSEArm::Reconstruct()
{
// Fine Reconstruction of particles in spectrometer
//std::cout << "SBSBigBite::Reconstruct()..." << std::endl;
THaSpectrometer::Reconstruct();
//Note that the call to THaSpectrometer::Reconstruct() above can lead
//to a SECOND call to SBSGEMPolarimeter::FineProcess for the back tracker
// If we are in the polarimeter mode, we know at this stage that