HepMCEx01/src/ExN04Field.cc

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
0005 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
0006 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
0007 // * conditions of the Geant4 Software License,  included in the file *
0008 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
0009 // * include a list of copyright holders.                             *
0010 // *                                                                  *
0011 // * Neither the authors of this software system, nor their employing *
0012 // * institutes,nor the agencies providing financial support for this *
0013 // * work  make  any representation or  warranty, express or implied, *
0014 // * regarding  this  software system or assume any liability for its *
0015 // * use.  Please see the license in the file  LICENSE  and URL above *
0016 // * for the full disclaimer and the limitation of liability.         *
0017 // *                                                                  *
0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
0020 // * By using,  copying,  modifying or  distributing the software (or *
0021 // * any work based  on the software)  you  agree  to acknowledge its *
0022 // * use  in  resulting  scientific  publications,  and indicate your *
0023 // * acceptance of all terms of the Geant4 Software license.          *
0024 // ********************************************************************
0025 //
0026 /// \file eventgenerator/HepMC/HepMCEx01/src/ExN04Field.cc
0027 /// \brief Implementation of the ExN04Field class
0028 //
0029 //
0030
0031 #include "ExN04Field.hh"
0032
0033 #include "G4SystemOfUnits.hh"
0034
0035 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0036 ExN04Field::ExN04Field() : G4MagneticField()
0037 {
0038   fBz = 3.0 * tesla;
0039   frmax_sq = sqr(50. * cm);
0040   fzmax = 100. * cm;
0041 }
0042
0043 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0044 ExN04Field::~ExN04Field() {}
0045
0046 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0047 void ExN04Field::GetFieldValue(const double Point[3], double* Bfield) const
0048 {
0049   Bfield[0] = 0.;
0050   Bfield[1] = 0.;
0051   if (std::abs(Point[2]) < fzmax && (sqr(Point[0]) + sqr(Point[1])) < frmax_sq) {
0052     Bfield[2] = fBz;
0053   }
0054   else {
0055     Bfield[2] = 0.;
0056   }
0057 }