| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | ///////////////////////////////////////////////////////////////////////////////
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| 27 | // File: CCalMagneticField.cc
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| 28 | // Description: User Field class implementation.
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| 29 | ///////////////////////////////////////////////////////////////////////////////
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| 30 | #include "CCalMagneticField.hh"
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| 31 | #include "CCalutils.hh"
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| 32 | #include "G4FieldManager.hh"
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| 33 | #include <fstream>
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| 34 |
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| 35 | //#define ddebug
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| 36 | //#define debug
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| 37 |
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| 38 | //Constructor and destructor:
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| 39 |
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| 40 | CCalMagneticField::CCalMagneticField(const G4String &filename) :
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| 41 | fval(0), pos(0), slope(0), intercept(0) {
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| 42 |
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| 43 | //Let's open the file
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| 44 | G4cout << " ==> Opening file " << filename << " to read magnetic field..."
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| 45 | << G4endl;
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| 46 | G4String pathName = getenv("CCAL_GLOBALPATH");
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| 47 | std::ifstream is;
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| 48 | bool ok = openGeomFile(is, pathName, filename);
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| 49 |
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| 50 | if (ok) {
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| 51 | findDO(is, G4String("FLDM"));
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| 52 | is >> fval >> npts >> xoff;
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| 53 | #ifdef debug
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| 54 | G4cout << "Field value " << fval << " # points " << npts << " offset in x "
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| 55 | << xoff*mm << G4endl;
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| 56 | #endif
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| 57 |
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| 58 | if (npts > 0) {
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| 59 | pos = new G4double[npts];
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| 60 | slope = new G4double[npts];
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| 61 | intercept = new G4double[npts];
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| 62 |
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| 63 | for (G4int i = 0; i < npts; i++) {
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| 64 | is >> pos[i] >> slope[i] >> intercept[i];
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| 65 | #ifdef debug
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| 66 | G4cout << tab << "Position " << i << " " << pos[i] << " Slope "
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| 67 | << slope[i] << " Intercept " << intercept[i] << G4endl;
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| 68 | #endif
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| 69 | }
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| 70 | }
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| 71 |
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| 72 | ///////////////////////////////////////////////////////////////
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| 73 | // Close the file
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| 74 | G4cout << " ==> Closing file " << filename << G4endl;
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| 75 | is.close();
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| 76 | }
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| 77 | }
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| 78 |
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| 79 |
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| 80 | CCalMagneticField::~CCalMagneticField() {
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| 81 | if (pos)
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| 82 | delete[] pos;
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| 83 | if (slope)
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| 84 | delete[] slope;
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| 85 | if (intercept)
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| 86 | delete[] intercept;
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| 87 | }
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| 88 |
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| 89 |
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| 90 | // Member functions
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| 91 |
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| 92 | void CCalMagneticField::MagneticField(const double x[3], double B[3]) const {
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| 93 |
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| 94 | G4int i=0;
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| 95 | for (i=0; i<2; i++) {
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| 96 | B[i] = 0*kilogauss;
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| 97 | }
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| 98 |
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| 99 | G4double m=0, c=0;
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| 100 | G4double xnew = x[0]/mm + xoff;
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| 101 | if (npts > 0) {
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| 102 | for (i=0; i<npts; i++) {
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| 103 | if (xnew > pos[i]*mm) {
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| 104 | m = slope[i];
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| 105 | c = intercept[i];
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| 106 | }
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| 107 | }
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| 108 | }
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| 109 | G4double scor = c + m*xnew;
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| 110 | if (scor < 0.) scor = 0.;
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| 111 | if (scor > 1.) scor = 1.0;
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| 112 |
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| 113 | B[2] = scor*fval*kilogauss;
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| 114 | #ifdef ddebug
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| 115 | G4cout << "Field at x: " << x[0]/mm << "mm (" << xnew << ") = " << B[2]/tesla
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| 116 | << "T (m = " << m << ", c = " << c << ", scale = " << scor << ")"
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| 117 | << G4endl;
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| 118 | #endif
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| 119 | }
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| 120 |
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| 121 |
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| 122 | CLHEP::Hep3Vector CCalMagneticField::
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| 123 | MagneticField(const CLHEP::Hep3Vector point) const {
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| 124 |
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| 125 | G4double x[3],B[3];
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| 126 | CLHEP::Hep3Vector v;
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| 127 |
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| 128 | x[0] = point.x();
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| 129 | x[1] = point.y();
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| 130 | x[2] = point.z();
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| 131 | CCalMagneticField::MagneticField(x, B);
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| 132 | v.setX(B[0]);
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| 133 | v.setY(B[1]);
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| 134 | v.setZ(B[2]);
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| 135 | return v;
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| 136 | }
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| 137 |
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| 138 |
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| 139 | void CCalMagneticField::GetFieldValue(const double x[3], double* B) const {
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| 140 | CCalMagneticField::MagneticField(x, B);
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| 141 | }
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| 142 |
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