00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // $Id: G4QuadrupoleMagField.hh 69786 2013-05-15 09:38:51Z gcosmo $ 00028 // 00029 // 00030 // class G4QuadrupoleMagField 00031 // 00032 // Class description: 00033 // 00034 // Class for creation of quadrupole magnetic field 00035 // fGradient - is the gradient value for quadrupole magnetic lense. 00036 // Then the magnetic field components are: 00037 // Bx = B[0] = fGradient*X , 00038 // By = B[1] = fGradient*Y , 00039 // Bz = B[2] = 0 . 00040 // Here X,Y,Z are the coordinates of a space point of interest. 00041 00042 // History: 00043 // 3.2.97 - V.Grichine, created. 00044 // 11.5.12 - B. Riese allow displaced origin and rotation (Björn Riese) 00045 // ------------------------------------------------------------------- 00046 00047 #ifndef G4QUADRUPOLEMAGFIELD_HH 00048 #define G4QUADRUPOLEMAGFIELD_HH 00049 00050 #include "G4MagneticField.hh" 00051 #include "G4ThreeVector.hh" 00052 #include "G4RotationMatrix.hh" 00053 00054 class G4QuadrupoleMagField : public G4MagneticField 00055 { 00056 public: // with description 00057 00058 G4QuadrupoleMagField(G4double pGradient); 00059 G4QuadrupoleMagField(G4double pGradient, 00060 G4ThreeVector pOrigin, 00061 G4RotationMatrix* pMatrix); 00062 ~G4QuadrupoleMagField(); 00063 00064 void GetFieldValue(const G4double yTrack[], 00065 G4double B[] ) const; 00066 private: 00067 00068 G4double fGradient; 00069 G4ThreeVector fOrigin; 00070 G4RotationMatrix* fpMatrix; 00071 }; 00072 #endif 00073