Import Geant4 9.1.0 source tree

2016-06-09 15:37:50 +02:00
parent a8e9364cea
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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: MedicalBeam.cc,v 1.1 2007/11/16 14:29:33 kmura Exp $
+// $Name: geant4-09-01 $
+// ====================================================================
+//   MedicalBeam.cc
+//
+//                                         2005 Q
+// ====================================================================
+#include "MedicalBeam.hh"
+#include "Randomize.hh"
+#include "G4Event.hh"
+#include "G4ParticleTable.hh"
+#include "G4PrimaryVertex.hh"
+
+using namespace CLHEP;
+
+#include <cmath>
+
+// ====================================================================
+//
+// class description
+//
+// ====================================================================
+
+///////////////////////////////////
+MedicalBeam::MedicalBeam()
+  : particle(0), 
+    kineticE(1.*MeV),
+    sourcePosition(G4ThreeVector()),
+    SSD(1.*m), 
+    fieldShape(MedicalBeam::SQUARE),
+    fieldR(10.*cm)
+///////////////////////////////////
+{
+
+  G4ParticleTable* particleTable= G4ParticleTable::GetParticleTable();
+  particle= particleTable-> FindParticle("proton");
+
+  kineticE= 200.*MeV;
+  sourcePosition= G4ThreeVector(0.,0.,-125.*cm);
+  SSD= 100.*cm;
+  fieldXY[0]= fieldXY[1]= 5.*cm;
+}
+
+
+///////////////////////////
+MedicalBeam::~MedicalBeam()
+///////////////////////////
+{
+}
+
+
+////////////////////////////////////////////////////////
+G4ThreeVector MedicalBeam::GenerateBeamDirection() const
+////////////////////////////////////////////////////////
+{
+  // uniform distribution in a limitted solid angle
+  G4double dr;
+  if(fieldShape == MedicalBeam::SQUARE) {
+    dr= std::sqrt(sqr(fieldXY[0]/2.)+sqr(fieldXY[1]/2.));
+  } else {
+    dr= fieldR;
+  }
+
+  G4double sin0= dr/SSD;
+  G4double cos0= std::sqrt(1.-sqr(sin0));
+
+  G4double dcos=0.;
+  G4double dsin, dphi, z;
+
+  G4double x= DBL_MAX;
+  G4double y= DBL_MAX;
+
+  G4double xmax, ymax;
+  if(fieldShape == MedicalBeam::SQUARE) {
+    xmax= fieldXY[0]/2./SSD;
+    ymax= fieldXY[1]/2./SSD;
+  } else {
+    xmax= ymax= DBL_MAX-1.;
+  }
+
+  while(! (std::abs(x)< xmax && std::abs(y)< ymax) ) {
+    dcos= RandFlat::shoot(cos0, 1.);
+    dsin= std::sqrt(1.-sqr(dcos));
+    dphi= RandFlat::shoot(0., twopi);
+
+    x= std::cos(dphi)*dsin*dcos;
+    y= std::sin(dphi)*dsin*dcos;
+  }
+  z= dcos;
+
+  return G4ThreeVector(x,y,z);
+}
+
+
+/////////////////////////////////////////////////////
+void MedicalBeam::GeneratePrimaries(G4Event* anEvent)
+/////////////////////////////////////////////////////
+{
+  if(particle==0) return;
+
+  // create a new vertex
+  G4PrimaryVertex* vertex= new G4PrimaryVertex(sourcePosition, 0.*ns);
+
+  // momentum
+  G4double mass= particle-> GetPDGMass();
+  G4double p= std::sqrt(sqr(mass+kineticE)-sqr(mass));
+  G4ThreeVector pmon= p*GenerateBeamDirection();
+  G4PrimaryParticle* primary= new G4PrimaryParticle(particle, 
+						    pmon.x(), 
+						    pmon.y(), 
+						    pmon.z());
+  // set primary to vertex
+  vertex-> SetPrimary(primary);
+
+  // set vertex to event
+  anEvent-> AddPrimaryVertex(vertex);
+}
+