F04GlobalField.cc

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/// \file field/field04/src/F04GlobalField.cc
/// \brief Implementation of the F04GlobalField class
//
 
#include <ctime>
 
#include "Randomize.hh"
#include "G4TransportationManager.hh"
 
#include "G4ExplicitEuler.hh"
#include "G4ImplicitEuler.hh"
#include "G4SimpleRunge.hh"
#include "G4SimpleHeum.hh"
#include "G4ClassicalRK4.hh"
#include "G4CashKarpRKF45.hh"
#include "G4SystemOfUnits.hh"
 
#include "F04GlobalField.hh"
#include "F04SimpleSolenoid.hh"
#include "F04FocusSolenoid.hh"
 
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G4ThreadLocal F04GlobalField* F04GlobalField::fObject = nullptr;
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
F04GlobalField::F04GlobalField(F04DetectorConstruction* det)
  : fDetectorConstruction(det)
{
  fFieldMessenger = new F04FieldMessenger(this,det);
 
  fFields = new FieldList();
 
  //  set object
  fObject = this;
 
  ConstructField();
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
F04GlobalField::~F04GlobalField()
{
  Clear();
 
  delete fFields;
 
  delete fFieldMessenger;
 
  delete fEquation;
  delete fStepper;
  delete fChordFinder;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void F04GlobalField::ConstructField()
{
  Clear();
 
  //  Construct equ. of motion of particles through B fields
//  fEquation = new G4Mag_EqRhs(this);
  //  Construct equ. of motion of particles through e.m. fields
//  fEquation = new G4EqMagElectricField(this);
  //  Construct equ. of motion of particles including spin through B fields
//  fEquation = new G4Mag_SpinEqRhs(this);
  //  Construct equ. of motion of particles including spin through e.m. fields
  fEquation = new G4EqEMFieldWithSpin(this);
 
  //  Get transportation, field, and propagator managers
  G4TransportationManager* transportManager =
         G4TransportationManager::GetTransportationManager();
 
  fFieldManager = GetGlobalFieldManager();
 
  fFieldPropagator = transportManager->GetPropagatorInField();
 
  //  Need to SetFieldChangesEnergy to account for a time varying electric
  //  field (r.f. fields)
  fFieldManager->SetFieldChangesEnergy(true);
 
  //  Set the field
  fFieldManager->SetDetectorField(this);
 
  //  Choose a stepper for integration of the equation of motion
  SetStepper();
 
  //  Create a cord finder providing the (global field, min step length,
  //  a pointer to the stepper)
  fChordFinder = new G4ChordFinder((G4MagneticField*)this,fMinStep,fStepper);
 
  // Set accuracy parameters
  fChordFinder->SetDeltaChord( fDeltaChord );
 
  fFieldManager->SetAccuraciesWithDeltaOneStep(fDeltaOneStep);
 
  fFieldManager->SetDeltaIntersection(fDeltaIntersection);
 
  fFieldPropagator->SetMinimumEpsilonStep(fEpsMin);
  fFieldPropagator->SetMaximumEpsilonStep(fEpsMax);
 
  G4cout << "Accuracy Parameters:" <<
            " MinStep=" << fMinStep <<
            " DeltaChord=" << fDeltaChord <<
            " DeltaOneStep=" << fDeltaOneStep << G4endl;
  G4cout << "                    " <<
            " DeltaIntersection=" << fDeltaIntersection <<
            " EpsMin=" << fEpsMin <<
            " EpsMax=" << fEpsMax <<  G4endl;
 
  fFieldManager->SetChordFinder(fChordFinder);
 
  G4double l = 0.0;
  G4double B1 = fDetectorConstruction->GetCaptureMgntB1();
  G4double B2 = fDetectorConstruction->GetCaptureMgntB2();
 
  G4LogicalVolume* logicCaptureMgnt = fDetectorConstruction->GetCaptureMgnt();
  G4ThreeVector captureMgntCenter =
                                 fDetectorConstruction->GetCaptureMgntCenter();
 
  auto  focusSolenoid =
           new F04FocusSolenoid(B1, B2, l, logicCaptureMgnt,captureMgntCenter);
  focusSolenoid -> SetHalf(true);
 
  G4double B = fDetectorConstruction->GetTransferMgntB();
 
  G4LogicalVolume* logicTransferMgnt =
                                      fDetectorConstruction->GetTransferMgnt();
  G4ThreeVector transferMgntCenter =
                                fDetectorConstruction->GetTransferMgntCenter();
 
  auto  simpleSolenoid =
             new F04SimpleSolenoid(B, l, logicTransferMgnt,transferMgntCenter);
 
  simpleSolenoid->SetColor("1,0,1");
  simpleSolenoid->SetColor("0,1,1");
  simpleSolenoid->SetMaxStep(1.5*mm);
  simpleSolenoid->SetMaxStep(2.5*mm);
 
  if (fFields) {
     if (fFields->size()>0) {
        FieldList::iterator i;
        for (i=fFields->begin(); i!=fFields->end(); ++i){
            (*i)->Construct();
        }
     }
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
F04GlobalField* F04GlobalField::GetObject(F04DetectorConstruction* det)
{
  if (!fObject) new F04GlobalField(det);
  return fObject;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
F04GlobalField* F04GlobalField::GetObject()
{
  if (fObject) return fObject;
  return nullptr;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void F04GlobalField::SetStepper()
{
  delete fStepper;
 
  switch ( fStepperType )
  {
    case 0:
//      fStepper = new G4ExplicitEuler( fEquation, 8 ); // no spin tracking
      fStepper = new G4ExplicitEuler( fEquation, 12 ); // with spin tracking
      G4cout << "G4ExplicitEuler is called" << G4endl;
      break;
    case 1:
//      fStepper = new G4ImplicitEuler( fEquation, 8 ); // no spin tracking
      fStepper = new G4ImplicitEuler( fEquation, 12 ); // with spin tracking
      G4cout << "G4ImplicitEuler is called" << G4endl;
      break;
    case 2:
//      fStepper = new G4SimpleRunge( fEquation, 8 ); // no spin tracking
      fStepper = new G4SimpleRunge( fEquation, 12 ); // with spin tracking
      G4cout << "G4SimpleRunge is called" << G4endl;
      break;
    case 3:
//      fStepper = new G4SimpleHeum( fEquation, 8 ); // no spin tracking
      fStepper = new G4SimpleHeum( fEquation, 12 ); // with spin tracking
      G4cout << "G4SimpleHeum is called" << G4endl;
      break;
    case 4:
//      fStepper = new G4ClassicalRK4( fEquation, 8 ); // no spin tracking
      fStepper = new G4ClassicalRK4( fEquation, 12 ); // with spin tracking
      G4cout << "G4ClassicalRK4 (default) is called" << G4endl;
      break;
    case 5:
//      fStepper = new G4CashKarpRKF45( fEquation, 8 ); // no spin tracking
      fStepper = new G4CashKarpRKF45( fEquation, 12 ); // with spin tracking
      G4cout << "G4CashKarpRKF45 is called" << G4endl;
      break;
    default: fStepper = nullptr;
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4FieldManager* F04GlobalField::GetGlobalFieldManager()
{
  return G4TransportationManager::GetTransportationManager()
                                ->GetFieldManager();
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void F04GlobalField::GetFieldValue(const G4double* point, G4double* field) const
{
  // NOTE: this routine dominates the CPU time for tracking.
  // Using the simple array fFp[] instead of fields[]
  // directly sped it up
 
  field[0] = field[1] = field[2] = field[3] = field[4] = field[5] = 0.0;
 
  // protect against Geant4 bug that calls us with point[] NaN.
  if(point[0] != point[0]) return;
 
  // (can't use fNfp or fFp, as they may change)
  if (fFirst) ((F04GlobalField*)this)->SetupArray();   // (cast away const)
 
  for (int i=0; i<fNfp; ++i) {
      const F04ElementField* p = fFp[i];
      if (p->IsInBoundingBox(point)) {
         p->AddFieldValue(point,field);
      }
  }
 
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void F04GlobalField::Clear()
{
  if (fFields) {
     if (fFields->size()>0) {
        FieldList::iterator i;
        for (i=fFields->begin(); i!=fFields->end(); ++i) delete *i;
        fFields->clear();
     }
  }
 
  delete [] fFp;
  fFirst = true;
  fNfp = 0;
  fFp = nullptr;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void F04GlobalField::SetupArray()
{
  fFirst = false;
  fNfp = fFields->size();
  fFp = new const F04ElementField* [fNfp+1]; // add 1 so it's never 0
  for (int i=0; i<fNfp; ++i) fFp[i] = (*fFields)[i];
}