Import Geant4 9.1.0 source tree

2016-06-09 15:37:50 +02:00
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+//
+// $Id: G4EqEMFieldWithSpin.cc,v 1.1 2007/08/30 23:34:19 gum Exp $
+// GEANT4 tag $Name: geant4-09-01 $
+//
+//
+//  This is the standard right-hand side for equation of motion.
+//
+//  The only case another is required is when using a moving reference
+//  frame ... or extending the class to include additional Forces,
+//  eg an electric field
+//
+//  30.08.2007 Chris Gong, Peter Gumplinger
+//
+// -------------------------------------------------------------------
+
+#include "G4EqEMFieldWithSpin.hh"
+#include "G4ThreeVector.hh"
+#include "globals.hh"
+
+G4EqEMFieldWithSpin::G4EqEMFieldWithSpin(G4ElectroMagneticField *emField )
+      : G4EquationOfMotion( emField ) { anomaly = 1.165923e-3; }
+
+void  
+G4EqEMFieldWithSpin::SetChargeMomentumMass(G4double particleCharge, // e+ units
+		                            G4double MomentumXc,
+                                            G4double particleMass)
+{
+   fElectroMagCof =  eplus*particleCharge*c_light ;
+   fMassCof = particleMass*particleMass ;
+
+   omegac = 0.105658387*GeV/particleMass * 2.837374841e-3*(rad/cm/kilogauss);
+
+   ParticleCharge = particleCharge;
+
+   E = std::sqrt(sqr(MomentumXc)+sqr(particleMass));
+   beta  = MomentumXc/E;
+   gamma = E/particleMass;
+}
+
+
+
+void
+G4EqEMFieldWithSpin::EvaluateRhsGivenB(const G4double y[],
+			                const G4double Field[],
+				              G4double dydx[] ) const
+{
+
+   // Components of y:
+   //    0-2 dr/ds, 
+   //    3-5 dp/ds - momentum derivatives 
+
+   G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
+
+   G4double Energy   = std::sqrt( pSquared + fMassCof );
+   G4double cof2     = Energy/c_light ;
+
+   G4double pModuleInverse  = 1.0/std::sqrt(pSquared) ;
+
+   //  G4double inverse_velocity = Energy * c_light * pModuleInverse;
+   G4double inverse_velocity = Energy * pModuleInverse / c_light;
+
+   G4double cof1     = fElectroMagCof*pModuleInverse ;
+
+   //  G4double vDotE = y[3]*Field[3] + y[4]*Field[4] + y[5]*Field[5] ;
+
+
+   dydx[0] = y[3]*pModuleInverse ;                         
+   dydx[1] = y[4]*pModuleInverse ;                         
+   dydx[2] = y[5]*pModuleInverse ;                        
+
+   dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field[2] - y[5]*Field[1])) ;
+   
+   dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field[0] - y[3]*Field[2])) ; 
+ 
+   dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field[1] - y[4]*Field[0])) ;  
+
+   // Lab Time of flight
+   dydx[7] = inverse_velocity;
+
+   G4ThreeVector BField(Field[0],Field[1],Field[2]);
+
+   G4ThreeVector u(y[3], y[4], y[5]);
+   u *= pModuleInverse;
+
+   G4double udb = anomaly*beta*gamma/(1.+gamma) * (BField * u);
+   G4double ucb = (anomaly+1./gamma)/beta;
+
+   G4ThreeVector Spin(y[9],y[10],y[11]);
+   G4ThreeVector dSpin;
+
+   dSpin = ParticleCharge*omegac*(ucb*(Spin.cross(BField))-udb*(Spin.cross(u)));
+
+   dydx[ 9] = dSpin.x();
+   dydx[10] = dSpin.y();
+   dydx[11] = dSpin.z();
+
+   return ;
+}