Geant4 Cross Reference

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Geant4/examples/extended/field/field04/src/F04FocusSolenoid.cc

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 26 //
 27 /// \file field/field04/src/F04FocusSolenoid.cc
 28 /// \brief Implementation of the F04FocusSolenoid class
 29 //
 30 
 31 #include "F04FocusSolenoid.hh"
 32 
 33 #include "F04GlobalField.hh"
 34 #include "F04SimpleSolenoid.hh"
 35 
 36 #include "G4GeometryManager.hh"
 37 #include "globals.hh"
 38 
 39 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 40 
 41 F04FocusSolenoid::F04FocusSolenoid(G4double Ba, G4double Bb, G4double fz, G4LogicalVolume* lv,
 42                                    G4ThreeVector c)
 43   : F04SimpleSolenoid(Ba, fz, lv, c), fB1(Ba), fB2(Bb)
 44 {}
 45 
 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 47 
 48 void F04FocusSolenoid::AddFieldValue(const G4double point[4], G4double field[6]) const
 49 {
 50   G4ThreeVector global(point[0], point[1], point[2]);
 51 
 52   G4ThreeVector local = fGlobal2local.TransformPoint(global);
 53 
 54   if (IsOutside(local)) return;
 55 
 56   G4double length = ((F04SimpleSolenoid*)this)->GetLength();
 57 
 58   G4double Bz = (fB2 - fB1) * std::abs(local.z()) / (length / 2.) + fB1;
 59 
 60   if (fHalf) {
 61     if (local.z() >= 0.) Bz = fB1;
 62   }
 63 
 64   G4ThreeVector B(0.0, 0.0, Bz);
 65 
 66   B = fGlobal2local.Inverse().TransformAxis(B);
 67 
 68   field[0] += B[0];
 69   field[1] += B[1];
 70   field[2] += B[2];
 71 }
 72