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Field.cc
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Field.cc
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/*
Authors: Haiwang Yu
*/
#include "Field.h"
#include <phfield/PHField.h>
#include <TVector3.h> // for TVector3
#include <CLHEP/Units/SystemOfUnits.h>
#include <cassert>
#include <limits>
namespace genfit
{
Field::Field(const PHField* field)
: field_(field)
{
assert(field_);
}
//
//bool Field::initialize(std::string inname)
//{
// field_map_r_ = new TH2D("field_map_r_", "B_{r} [kGauss]; z [cm]; r [cm]", 401, -401, 401, 151, -1, 301);
// field_map_r_->SetDirectory(0);
// field_map_z_ = new TH2D("field_map_z_", "B_{z} [kGauss]; z [cm]; r [cm]", 401, -401, 401, 151, -1, 301);
// field_map_z_->SetDirectory(0);
// TFile* fin = TFile::Open(inname.data(), "READ");
// if (!fin)
// {
// LogERROR("Input TFile is invalid!");
// return false;
// }
// TNtuple* T = (TNtuple*) fin->Get("fieldmap");
// if (!T)
// {
// LogERROR("Input filed map NTuple not found!");
// ;
// return false;
// }
//
// Float_t r;
// Float_t z;
// Float_t br;
// Float_t bz;
// T->SetBranchAddress("r", &r);
// T->SetBranchAddress("z", &z);
// T->SetBranchAddress("br", &br);
// T->SetBranchAddress("bz", &bz);
//
// for (long ientry = 0; ientry < T->GetEntries(); ientry++)
// {
// //if (T->GetEntry(ientry) < 0) continue;
// T->GetEntry(ientry);
// //std::cout<<r <<" ,"<<z <<" ,"<<br<<" ,"<<bz<<"\n";
// field_map_r_->SetBinContent(
// field_map_r_->GetXaxis()->FindBin(z),
// field_map_r_->GetYaxis()->FindBin(r),
// br * 10);
// field_map_z_->SetBinContent(
// field_map_z_->GetXaxis()->FindBin(z),
// field_map_z_->GetYaxis()->FindBin(r),
// bz * 10);
// }
// fin->Close();
//
// //field_map_z_->Print("all");
//
// return true;
//}
//void Field::plot(std::string option){
//
//// TH2D *hbr = new TH2D("hbr","|B_{r}| [kGauss]; z [cm]; r [cm]",401, -401, 401, 151, -1, 301);
//// TH2D *hbz = new TH2D("hbz","|B_{z}| [kGauss]; z [cm]; r [cm]",401, -401, 401, 151, -1, 301);
// TH2D *hbr = new TH2D("hbr","|B_{r}| [kGauss]; z [cm]; r [cm]",300, -350, 350, 200, 0, 290);
// TH2D *hbz = new TH2D("hbz","|B_{z}| [kGauss]; z [cm]; r [cm]",300, -350, 350, 200, 0, 290);
// for (double r = 0; r < 300; r+=1)
// for (double z = 400; z > -400; z-=1) {
// double bx;
// double by;
// double bz;
// get(r, 0, z, bx, by, bz);
//
//// double br = sqrt(bx * bx + by * by);
//
// //std::cout <<"DEBUG: "<<__LINE__<<":"<< r << " ," << z << " ," << br << " ," << bz << "\n";
//
// hbr->SetBinContent(
// hbr->GetXaxis()->FindBin(z),
// hbr->GetYaxis()->FindBin(r),
// bz*10);
// hbz->SetBinContent(
// hbz->GetXaxis()->FindBin(z),
// hbz->GetYaxis()->FindBin(r),
// bz*10);
// }
//
// TCanvas *c0 = new TCanvas("c0","c0");
// c0->Divide(1,2);
// c0->cd(1);
// hbr->SetStats(0);
// hbr->Draw("colz");
// c0->cd(2);
// hbz->SetStats(0);
// hbz->Draw("colz");
// c0->Update();
//
// c0->SaveAs("Field_plot.root");
// c0->SaveAs("Field_plot.pdf");
//
// delete c0;
// delete hbr;
// delete hbz;
//
// return;
//}
TVector3 Field::get(const TVector3& v) const
{
double x = v.x();
double y = v.y();
double z = v.z();
double Bx;
double By;
double Bz;
get(x, y, z, Bx, By, Bz);
return TVector3(Bx, By, Bz);
}
void Field::get(const double& x, const double& y, const double& z, double& Bx, double& By, double& Bz) const
{
assert(field_);
const double Point[] = {x * CLHEP::cm, y * CLHEP::cm, z * CLHEP::cm, 0};
double Bfield[] = {std::numeric_limits<double>::signaling_NaN(),
std::numeric_limits<double>::signaling_NaN(),
std::numeric_limits<double>::signaling_NaN(),
std::numeric_limits<double>::signaling_NaN(),
std::numeric_limits<double>::signaling_NaN(),
std::numeric_limits<double>::signaling_NaN()};
field_->GetFieldValue(Point, Bfield);
Bx = Bfield[0] / CLHEP::kilogauss;
By = Bfield[1] / CLHEP::kilogauss;
Bz = Bfield[2] / CLHEP::kilogauss;
// double r = sqrt(x * x + y * y);
//
// if (fabs(r) > 300 || fabs(z) > 400)
// {
// Bx = 0;
// By = 0;
// Bz = 0;
// return;
// }
//
// int bin_z = field_map_r_->GetXaxis()->FindBin(z);
// int bin_r = field_map_r_->GetYaxis()->FindBin(r);
//
// Bz = field_map_z_->GetBinContent(bin_z, bin_r);
// double Br = field_map_r_->GetBinContent(bin_z, bin_r);
//
// Bx = x / r * Br;
// By = y / r * Br;
//
// if (r == 0)
// {
// Bx = 0;
// By = 0;
// }
//std::cout<<"DEBUG: "<<__LINE__<<": "<<z<<","<<r<<","<<bin_z<<","<<bin_r<<": "<<Br<<","<<Bz<<"\n";
}
} /* End of namespace genfit */