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PrimaryGeneratorAction4.cc
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30 // $Id: PrimaryGeneratorAction4.cc 83897 2014-09-22 14:46:00Z gcosmo $
31 //
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34 
36 #include "PrimaryGeneratorAction.hh"
37 
38 #include "G4Event.hh"
39 #include "G4ParticleGun.hh"
40 #include "G4ParticleTable.hh"
41 #include "G4ParticleDefinition.hh"
42 #include "G4PhysicalConstants.hh"
43 #include "G4SystemOfUnits.hh"
44 #include "Randomize.hh"
45 
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47 
49 : fParticleGun(gun)
50 {
51  // vertex volume
52  //
53  G4double Rmin = 2.*mm;
54  G4double Rmax = 8.*mm;
55  fRmin3 = Rmin*Rmin*Rmin;
56  fRmax3 = Rmax*Rmax*Rmax;
57 
58  //opening angle
59  //
60  G4double alphaMin = 0.*deg;
61  G4double alphaMax = 60.*deg;
62  fCosAlphaMin = std::cos(alphaMin);
63  fCosAlphaMax = std::cos(alphaMax);
64 }
65 
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67 
69 { }
70 
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72 
74 {
75  //vertex position uniform in spherical shell
76  //
77  G4double cosTheta = 2*G4UniformRand() - 1; //cosTheta uniform in [0, pi]
78  G4double sinTheta = std::sqrt(1. - cosTheta*cosTheta);
79  G4double phi = twopi*G4UniformRand(); //phi uniform in [0, 2*pi]
80  G4ThreeVector ur(sinTheta*std::cos(phi),sinTheta*std::sin(phi),cosTheta);
81 
83  G4double R = std::pow(R3, 1./3);
84 
86 
87  //particle direction uniform around ur
88  //
89  //1- in World frame
90  //cosAlpha uniform in [cos(alphaMin), cos(alphaMax)]
92  G4double sinAlpha = std::sqrt(1. - cosAlpha*cosAlpha);
93  G4double psi = twopi*G4UniformRand(); //psi uniform in (0,2*pi)
94  G4ThreeVector dir(sinAlpha*std::cos(psi),sinAlpha*std::sin(psi),cosAlpha);
95 
96  //2- rotate dir (rotateUz transforms uz to ur)
97  dir.rotateUz(ur);
98 
100 
101  //energy
102  //
104 
105  //create vertex
106  //
108 }
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static constexpr double MeV
Definition: G4SIunits.hh:214
Definition of the PrimaryGeneratorAction4 class.
static constexpr double mm
Definition: G4SIunits.hh:115
Hep3Vector & rotateUz(const Hep3Vector &)
Definition: ThreeVector.cc:38
void SetParticlePosition(G4ThreeVector aPosition)
double G4double
Definition: G4Types.hh:76
static constexpr double deg
Definition: G4SIunits.hh:152
#define G4UniformRand()
Definition: Randomize.hh:53
static constexpr double twopi
Definition: G4SIunits.hh:76
Double_t R
PrimaryGeneratorAction4(G4ParticleGun *)
TDirectory * dir
virtual void GeneratePrimaryVertex(G4Event *evt)
void SetParticleEnergy(G4double aKineticEnergy)
void SetParticleMomentumDirection(G4ParticleMomentum aMomentumDirection)