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These * 9 // * include a list of copyright holders. 9 // * include a list of copyright holders. * 10 // * 10 // * * 11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing * 12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this * 13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, * 14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its * 15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. * 17 // * 17 // * * 18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************* 24 // ******************************************************************** 25 // 25 // 26 // G4SextupoleMagField implementation 26 // G4SextupoleMagField implementation 27 // by H. Burkhardt 23/10/2019 27 // by H. Burkhardt 23/10/2019 28 // ------------------------------------------- 28 // ------------------------------------------------------------------- 29 29 30 #include "G4SextupoleMagField.hh" 30 #include "G4SextupoleMagField.hh" 31 #include "G4RotationMatrix.hh" 31 #include "G4RotationMatrix.hh" 32 32 33 // ------------------------------------------- 33 // ------------------------------------------------------------------- 34 34 35 namespace 35 namespace 36 { 36 { 37 G4RotationMatrix IdentityMatrix; 37 G4RotationMatrix IdentityMatrix; 38 } 38 } 39 39 40 G4SextupoleMagField::G4SextupoleMagField(G4dou 40 G4SextupoleMagField::G4SextupoleMagField(G4double pGradient) 41 { 41 { 42 fGradient = pGradient; 42 fGradient = pGradient; 43 fpMatrix = &IdentityMatrix; 43 fpMatrix = &IdentityMatrix; 44 } 44 } 45 45 46 G4SextupoleMagField::G4SextupoleMagField(G4dou 46 G4SextupoleMagField::G4SextupoleMagField(G4double pGradient, 47 const << 47 G4ThreeVector pOrigin, 48 G4Rot 48 G4RotationMatrix* pMatrix) 49 { 49 { 50 fGradient = pGradient ; 50 fGradient = pGradient ; 51 fOrigin = pOrigin ; 51 fOrigin = pOrigin ; 52 fpMatrix = pMatrix ; 52 fpMatrix = pMatrix ; 53 } 53 } 54 54 55 G4Field* G4SextupoleMagField::Clone() const 55 G4Field* G4SextupoleMagField::Clone() const 56 { 56 { 57 return new G4SextupoleMagField(fGradient, fO 57 return new G4SextupoleMagField(fGradient, fOrigin, fpMatrix); 58 } 58 } 59 59 60 // ------------------------------------------- 60 // ------------------------------------------------------------------- 61 61 62 G4SextupoleMagField::~G4SextupoleMagField() = << 62 G4SextupoleMagField::~G4SextupoleMagField() >> 63 { >> 64 } 63 65 64 void G4SextupoleMagField::GetFieldValue( const << 66 void G4SextupoleMagField::GetFieldValue( const G4double y[4], 65 << 67 G4double B[3] ) const 66 // with displaced origin and rotation 68 // with displaced origin and rotation 67 { 69 { 68 G4ThreeVector r_global = G4ThreeVector( 70 G4ThreeVector r_global = G4ThreeVector( 69 y[0] 71 y[0] - fOrigin.x(), 70 y[1] 72 y[1] - fOrigin.y(), 71 y[2] 73 y[2] - fOrigin.z()); 72 74 73 const G4ThreeVector r_local = (*fpMatrix) * 75 const G4ThreeVector r_local = (*fpMatrix) * r_global; 74 const G4ThreeVector B_local( fGradient * r_l 76 const G4ThreeVector B_local( fGradient * r_local.x() * r_local.y(),fGradient * ( std::pow(r_local.x(),2) - std::pow(r_local.y(),2) )/2 ,0); 75 const G4ThreeVector B_global = fpMatrix->inv 77 const G4ThreeVector B_global = fpMatrix->inverse() * B_local; 76 78 77 B[0] = B_global.x() ; 79 B[0] = B_global.x() ; 78 B[1] = B_global.y() ; 80 B[1] = B_global.y() ; 79 B[2] = B_global.z() ; 81 B[2] = B_global.z() ; 80 } 82 } 81 83