G4PSPassageCellFluxForCylinder3D.cc

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// G4PSPassageCellFluxForCylinder3D
#include "G4PSPassageCellFluxForCylinder3D.hh"
#include "G4PhysicalConstants.hh"

// (Description)
//   This is a primitive scorer class for scoring cell flux.
//   The Cell Flux is defined by  a track length divided by a geometry
//   volume, where only tracks passing through the geometry are taken
//  into account. e.g. the unit of Cell Flux is mm/mm3.
//
//   If you want to score all tracks in the geometry volume,
//  please use G4PSCellFlux.
//
// Created: 2007-08-14  Tsukasa ASO
// 2011-03-24   Give Size and Segmentation for relicated volume in cylinder.

G4PSPassageCellFluxForCylinder3D::G4PSPassageCellFluxForCylinder3D(G4String name,
               G4int ni, G4int nj, G4int nk,
               G4int di, G4int dj, G4int dk)
  :G4PSPassageCellFlux3D(name,ni,nj,nk,di,dj,dk)
{
  nSegment[0] = nSegment[1] = nSegment[2] = 0;
}

G4PSPassageCellFluxForCylinder3D::G4PSPassageCellFluxForCylinder3D(G4String name,const G4String& unit,
               G4int ni, G4int nj, G4int nk,
               G4int di, G4int dj, G4int dk)
  :G4PSPassageCellFlux3D(name,unit,ni,nj,nk,di,dj,dk)
{
  nSegment[0] = nSegment[1] = nSegment[2] = 0;
}

G4PSPassageCellFluxForCylinder3D::~G4PSPassageCellFluxForCylinder3D()
{;}

void G4PSPassageCellFluxForCylinder3D::SetCylinderSize(G4double dr, G4double dz){
  cylinderSize.setX(dz);    //Z Phi R
  cylinderSize.setY(twopi); //Z Phi R
  cylinderSize.setZ(dr);    //Z Phi R
}
void G4PSPassageCellFluxForCylinder3D::SetNumberOfSegments(G4int nSeg[3]){
  nSegment[0] = nSeg[0];  // Z
  nSegment[1] = nSeg[1];  // Phi
  nSegment[2] = nSeg[2];  // R
}
G4double G4PSPassageCellFluxForCylinder3D::ComputeVolume(G4Step*, G4int idx){
  G4double r0 = (cylinderSize[2]/nSegment[2])*(idx);
  G4double r1 = (cylinderSize[2]/nSegment[2])*(idx+1);
  G4double dRArea = (r1*r1-r0*r0)*pi;

  // cylinderSize is given in Half Size
  G4double fullz      = cylinderSize[0]/nSegment[0]*2.;  
  G4double phiRatio  = 1./nSegment[1];
  G4double v = dRArea*fullz*phiRatio;

  return v;
}