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Chad Lantz authoredChad Lantz authored
TestBeam2021PrimaryGenerator.cc 5.22 KiB
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/// \file TestBeam2021PrimaryGenerator.cc
/// \brief Implementation of the TestBeam2021PrimaryGenerator1 class
//
//
//
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#include "TestBeam2021PrimaryGenerator.hh"
#include "G4Event.hh"
#include "G4RunManager.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4PrimaryParticle.hh"
#include "G4PrimaryVertex.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4String.hh"
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TestBeam2021PrimaryGenerator::TestBeam2021PrimaryGenerator()
: G4VPrimaryGenerator(),
m_WireChamberSize(101)
{ }
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TestBeam2021PrimaryGenerator::~TestBeam2021PrimaryGenerator()
{ }
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void TestBeam2021PrimaryGenerator::GeneratePrimaryVertex(G4Event* event)
{
//Get the alignment from DetectorConstruction
if(event->GetEventID() == 0){
GetWireChamberDist();
}
G4double x = m_RandX->shoot()*(m_WireChamberSize-1)-(m_WireChamberSize-1)/2; //Map (0, 1) to (-50, 50), RandNum * 100 - 50
G4double y = m_RandY->shoot()*(m_WireChamberSize-1)-(m_WireChamberSize-1)/2;
G4ThreeVector position(x, y, 0);
G4double time = 0*s;
G4PrimaryVertex* vertex = new G4PrimaryVertex(position, time);
G4cout << "Beam scan & type & energy ==> (" << m_alignment.scanNumber << m_alignment.beam_type << ", " << m_alignment.beam_energy << ")" << G4endl;
G4cout << "Particle Position ==> (" << position.x() << ", " << position.y() << ", " << position.z() << ")" << G4endl;
G4ParticleDefinition* particleDefinition
= G4ParticleTable::GetParticleTable()->FindParticle(m_alignment.beam_type.c_str()); // about the definition of the ParticleTable, I changed the Alignment_2021.xml file, "e" to "e-", "p" to "proton"
G4PrimaryParticle* particle = new G4PrimaryParticle(particleDefinition);
particle->SetMomentumDirection(G4ThreeVector(0,0,1));
particle->SetKineticEnergy(m_alignment.beam_energy*GeV); //I'm not sure if I need units here
vertex->SetPrimary(particle);
event->AddPrimaryVertex(vertex);
}
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void TestBeam2021PrimaryGenerator::GetWireChamberDist(){
DetectorConstruction* dC
= (DetectorConstruction*)G4RunManager::GetRunManager()->GetUserDetectorConstruction();
m_alignment = dC->GetAlignment2021();
// Define the position of the particle
G4String _profile = (std::string)std::getenv("JZCaPA") + "/Utils/2021testbeam_scan/scan" + std::to_string(m_alignment.scanNumber) + ".txt"; //Select the corresponding scan file according to run number
// Attempt to open the file and check if it succeeded
std::ifstream _scanfile(_profile);
if ( !_scanfile.is_open() ){
G4cout << " ==== This Run does not belong to any processed Scan ==== " << G4endl; // You can check ("JZCaPA")/Utils/2021testbeam_scan/README.md
return;
}
G4double probListX[m_WireChamberSize],
probListY[m_WireChamberSize];
// Put the X and Y beam profile into two arrays
for(int j = 0; j < 2; ++j){
for(int i = 0; i <m_WireChamberSize; ++i){
if (!j){
_scanfile >> probListX[i];
}
_scanfile >> probListY[i];
}
}
_scanfile.close();
m_RandX = new G4RandGeneral(probListX,m_WireChamberSize); //Generate the random number, range (0, 1)
m_RandY = new G4RandGeneral(probListY,m_WireChamberSize);
}