Gabriele Cosmo
143 lines
4.3 KiB
C++
143 lines
4.3 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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///////////////////////////////////////////////////////////////////////////////
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// File: CCalMagneticField.cc
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// Description: User Field class implementation.
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///////////////////////////////////////////////////////////////////////////////
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#include "CCalMagneticField.hh"
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#include "CCalutils.hh"
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#include "G4FieldManager.hh"
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#include <fstream>
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//#define ddebug
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//#define debug
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//Constructor and destructor:
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CCalMagneticField::CCalMagneticField(const G4String &filename) :
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fval(0), pos(0), slope(0), intercept(0) {
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//Let's open the file
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G4cout << " ==> Opening file " << filename << " to read magnetic field..."
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<< G4endl;
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G4String pathName = getenv("CCAL_GLOBALPATH");
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std::ifstream is;
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bool ok = openGeomFile(is, pathName, filename);
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if (ok) {
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findDO(is, G4String("FLDM"));
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is >> fval >> npts >> xoff;
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#ifdef debug
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G4cout << "Field value " << fval << " # points " << npts << " offset in x "
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<< xoff*mm << G4endl;
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#endif
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if (npts > 0) {
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pos = new G4double[npts];
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slope = new G4double[npts];
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intercept = new G4double[npts];
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for (G4int i = 0; i < npts; i++) {
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is >> pos[i] >> slope[i] >> intercept[i];
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#ifdef debug
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G4cout << tab << "Position " << i << " " << pos[i] << " Slope "
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<< slope[i] << " Intercept " << intercept[i] << G4endl;
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#endif
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}
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}
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///////////////////////////////////////////////////////////////
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// Close the file
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G4cout << " ==> Closing file " << filename << G4endl;
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is.close();
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}
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}
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CCalMagneticField::~CCalMagneticField() {
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if (pos)
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delete[] pos;
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if (slope)
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delete[] slope;
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if (intercept)
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delete[] intercept;
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}
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// Member functions
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void CCalMagneticField::MagneticField(const double x[3], double B[3]) const {
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G4int i=0;
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for (i=0; i<2; i++) {
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B[i] = 0*kilogauss;
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}
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G4double m=0, c=0;
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G4double xnew = x[0]/mm + xoff;
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if (npts > 0) {
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for (i=0; i<npts; i++) {
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if (xnew > pos[i]*mm) {
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m = slope[i];
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c = intercept[i];
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}
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}
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}
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G4double scor = c + m*xnew;
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if (scor < 0.) scor = 0.;
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if (scor > 1.) scor = 1.0;
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B[2] = scor*fval*kilogauss;
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#ifdef ddebug
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G4cout << "Field at x: " << x[0]/mm << "mm (" << xnew << ") = " << B[2]/tesla
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<< "T (m = " << m << ", c = " << c << ", scale = " << scor << ")"
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<< G4endl;
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#endif
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}
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CLHEP::Hep3Vector CCalMagneticField::
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MagneticField(const CLHEP::Hep3Vector point) const {
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G4double x[3],B[3];
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CLHEP::Hep3Vector v;
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x[0] = point.x();
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x[1] = point.y();
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x[2] = point.z();
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CCalMagneticField::MagneticField(x, B);
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v.setX(B[0]);
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v.setY(B[1]);
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v.setZ(B[2]);
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return v;
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}
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void CCalMagneticField::GetFieldValue(const double x[3], double* B) const {
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CCalMagneticField::MagneticField(x, B);
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}
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