F04FocusSolenoid.cc

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/// \file field/field04/src/F04FocusSolenoid.cc
/// \brief Implementation of the F04FocusSolenoid class
//
 
#include "globals.hh"
 
#include "G4GeometryManager.hh"
 
#include "F04GlobalField.hh"
 
#include "F04FocusSolenoid.hh"
#include "F04SimpleSolenoid.hh"
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
F04FocusSolenoid::F04FocusSolenoid(G4double Ba, G4double Bb, G4double fz,
                           G4LogicalVolume* lv,
                           G4ThreeVector c)
 : F04SimpleSolenoid(Ba, fz, lv, c),
   fB1(Ba),
   fB2(Bb)
{}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void F04FocusSolenoid::AddFieldValue(const G4double point[4],
                                           G4double field[6]) const
{
   G4ThreeVector global(point[0],point[1],point[2]);
 
   G4ThreeVector local = fGlobal2local.TransformPoint(global);
 
   if (IsOutside(local)) return;
 
   G4double length = ((F04SimpleSolenoid*)this)->GetLength();
 
   G4double Bz = (fB2-fB1) * std::abs(local.z())/(length/2.) + fB1;
 
   if (fHalf) { if (local.z() >= 0.) Bz = fB1; }
 
   G4ThreeVector B(0.0,0.0,Bz);
 
   B = fGlobal2local.Inverse().TransformAxis(B);
 
   field[0] += B[0];
   field[1] += B[1];
   field[2] += B[2];
}