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PHG4MicromegasSteppingAction.cc
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PHG4MicromegasSteppingAction.cc
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/*!
* \file PHG4MicromegasSteppingAction.cc
* \author Hugo Pereira Da Costa <hugo.pereira-da-costa@cea.fr>
*/
#include "PHG4MicromegasSteppingAction.h"
#include "PHG4MicromegasDetector.h"
#include <phparameter/PHParameters.h>
#include <g4detectors/PHG4StepStatusDecode.h>
#include <g4main/PHG4Hit.h>
#include <g4main/PHG4HitContainer.h>
#include <g4main/PHG4Hitv1.h>
#include <g4main/PHG4Shower.h>
#include <g4main/PHG4SteppingAction.h>
#include <g4main/PHG4TrackUserInfoV1.h>
#include <phool/getClass.h>
#include <TSystem.h>
#include <Geant4/G4ParticleDefinition.hh>
#include <Geant4/G4ReferenceCountedHandle.hh>
#include <Geant4/G4Step.hh>
#include <Geant4/G4StepPoint.hh>
#include <Geant4/G4StepStatus.hh>
#include <Geant4/G4String.hh>
#include <Geant4/G4SystemOfUnits.hh>
#include <Geant4/G4ThreeVector.hh>
#include <Geant4/G4TouchableHandle.hh>
#include <Geant4/G4Track.hh>
#include <Geant4/G4TrackStatus.hh>
#include <Geant4/G4Types.hh>
#include <Geant4/G4VPhysicalVolume.hh>
#include <Geant4/G4VTouchable.hh>
#include <Geant4/G4VUserTrackInformation.hh>
#include <cmath>
#include <iostream>
#include <string>
class PHCompositeNode;
//____________________________________________________________________________..
PHG4MicromegasSteppingAction::PHG4MicromegasSteppingAction(PHG4MicromegasDetector *detector, const PHParameters *parameters)
: PHG4SteppingAction(detector->GetName())
, m_Detector(detector)
, m_Params(parameters)
, m_ActiveFlag(m_Params->get_int_param("active"))
, m_BlackHoleFlag(m_Params->get_int_param("blackhole"))
{}
//____________________________________________________________________________..
// This is the implementation of the G4 UserSteppingAction
bool PHG4MicromegasSteppingAction::UserSteppingAction(const G4Step *aStep,bool /*was_used*/)
{
G4TouchableHandle touch = aStep->GetPreStepPoint()->GetTouchableHandle();
G4TouchableHandle touchpost = aStep->GetPostStepPoint()->GetTouchableHandle();
// get volume of the current step
G4VPhysicalVolume *volume = touch->GetVolume();
if (!m_Detector->IsInDetector(volume)) return false;
// collect energy and track length step by step
G4double edep = aStep->GetTotalEnergyDeposit() / GeV;
G4double eion = (aStep->GetTotalEnergyDeposit() - aStep->GetNonIonizingEnergyDeposit()) / GeV;
const G4Track *aTrack = aStep->GetTrack();
// if this detector stops everything, just put all kinetic energy into edep
if (m_BlackHoleFlag)
{
edep = aTrack->GetKineticEnergy() / GeV;
auto killtrack = const_cast<G4Track *>(aTrack);
killtrack->SetTrackStatus(fStopAndKill);
}
bool geantino =
aTrack->GetParticleDefinition()->GetPDGEncoding() == 0 &&
aTrack->GetParticleDefinition()->GetParticleName().find("geantino") != std::string::npos;
G4StepPoint *prePoint = aStep->GetPreStepPoint();
G4StepPoint *postPoint = aStep->GetPostStepPoint();
// Here we have to decide if we need to create a new hit. Normally this should
// only be neccessary if a G4 Track enters a new volume or is freshly created
// For this we look at the step status of the prePoint (beginning of the G4 Step).
// This should be either fGeomBoundary (G4 Track crosses into volume) or
// fUndefined (G4 Track newly created)
// Sadly over the years with different G4 versions we have observed cases where
// G4 produces "impossible hits" which we try to catch here
// These errors were always rare and it is not clear if they still exist but we
// still check for them for safety. We can reproduce G4 runs identically (if given
// the sequence of random number seeds you find in the log), the printouts help
// us giving the G4 support information about those failures
switch (prePoint->GetStepStatus())
{
case fPostStepDoItProc:
if (m_SavePostStepStatus == fGeomBoundary)
{
// this is an impossible G4 Step print out diagnostic to help debug, not sure if
// this is still with us
std::cout << "PHG4MicromegasSteppingAction::UserSteppingAction - " << GetName() << ": New Hit for " << std::endl;
std::cout << "prestep status: " << PHG4StepStatusDecode::GetStepStatus(prePoint->GetStepStatus())
<< ", poststep status: " << PHG4StepStatusDecode::GetStepStatus(postPoint->GetStepStatus())
<< ", last pre step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePreStepStatus)
<< ", last post step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePostStepStatus)
<< std::endl;
std::cout << "last track: " << m_SaveTrackId << ", current trackid: " << aTrack->GetTrackID() << std::endl;
std::cout << "phys pre vol: " << volume->GetName() << " post vol : " << touchpost->GetVolume()->GetName() << std::endl;
std::cout << " previous phys pre vol: " << m_SaveVolPre->GetName() << " previous phys post vol: " << m_SaveVolPost->GetName() << std::endl;
}
break;
// These are the normal cases
case fGeomBoundary:
case fUndefined:
{
if (!m_hit) m_hit.reset( new PHG4Hitv1() );
// assign layer
m_hit->set_layer(m_Detector->get_layer(volume));
// here we set the entrance values in cm
m_hit->set_x(0, prePoint->GetPosition().x() / cm);
m_hit->set_y(0, prePoint->GetPosition().y() / cm);
m_hit->set_z(0, prePoint->GetPosition().z() / cm);
// momentum
m_hit->set_px(0, prePoint->GetMomentum().x() / GeV);
m_hit->set_py(0, prePoint->GetMomentum().y() / GeV);
m_hit->set_pz(0, prePoint->GetMomentum().z() / GeV);
// time in ns
m_hit->set_t(0, prePoint->GetGlobalTime() / nanosecond);
// set the track ID
m_hit->set_trkid(aTrack->GetTrackID());
m_SaveTrackId = aTrack->GetTrackID();
// reset the initial energy deposit
m_EdepSum = 0;
m_EionSum = 0;
m_hit->set_edep(0);
m_hit->set_eion(0);
m_SaveHitContainer = m_hitContainer;
// this is for the tracking of the truth info
if (G4VUserTrackInformation *p = aTrack->GetUserInformation())
{
if (PHG4TrackUserInfoV1 *pp = dynamic_cast<PHG4TrackUserInfoV1 *>(p))
{
m_hit->set_trkid(pp->GetUserTrackId());
pp->GetShower()->add_g4hit_id(m_SaveHitContainer->GetID(), m_hit->get_hit_id());
}
}
break;
}
default: break;
}
if (!m_hit || !std::isfinite(m_hit->get_x(0)))
{
std::cout << GetName() << ": hit was not created" << std::endl;
std::cout << "prestep status: " << PHG4StepStatusDecode::GetStepStatus(prePoint->GetStepStatus())
<< ", poststep status: " << PHG4StepStatusDecode::GetStepStatus(postPoint->GetStepStatus())
<< ", last pre step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePreStepStatus)
<< ", last post step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePostStepStatus)
<< std::endl;
std::cout << "last track: " << m_SaveTrackId << ", current trackid: " << aTrack->GetTrackID() << std::endl;
std::cout << "phys pre vol: " << volume->GetName() << " post vol : " << touchpost->GetVolume()->GetName() << std::endl;
std::cout << " previous phys pre vol: " << m_SaveVolPre->GetName() << " previous phys post vol: " << m_SaveVolPost->GetName() << std::endl;
// This is fatal - a hit from nowhere. This needs to be looked at and fixed
gSystem->Exit(1);
}
// check if track id matches the initial one when the hit was created
if (aTrack->GetTrackID() != m_SaveTrackId)
{
std::cout << GetName() << ": hits do not belong to the same track" << std::endl;
std::cout << "saved track: " << m_SaveTrackId
<< ", current trackid: " << aTrack->GetTrackID()
<< ", prestep status: " << prePoint->GetStepStatus()
<< ", previous post step status: " << m_SavePostStepStatus << std::endl;
// This is fatal - a hit from nowhere. This needs to be looked at and fixed
gSystem->Exit(1);
}
// We need to cache a few things from one step to the next
// to identify impossible hits and subsequent debugging printout
m_SavePreStepStatus = prePoint->GetStepStatus();
m_SavePostStepStatus = postPoint->GetStepStatus();
m_SaveVolPre = volume;
m_SaveVolPost = touchpost->GetVolume();
// here we just update the exit values, it will be overwritten
// for every step until we leave the volume or the particle
// ceases to exist
// sum up the energy to get total deposited
m_EdepSum += edep;
m_EionSum += eion;
// if any of these conditions is true this is the last step in
// this volume and we need to save the hit
// postPoint->GetStepStatus() == fGeomBoundary: track leaves this volume
// postPoint->GetStepStatus() == fWorldBoundary: track leaves this world
// (happens when your detector goes outside world volume)
// postPoint->GetStepStatus() == fAtRestDoItProc: track stops (typically
// aTrack->GetTrackStatus() == fStopAndKill is also set)
// aTrack->GetTrackStatus() == fStopAndKill: track ends
if (postPoint->GetStepStatus() == fGeomBoundary ||
postPoint->GetStepStatus() == fWorldBoundary ||
postPoint->GetStepStatus() == fAtRestDoItProc ||
aTrack->GetTrackStatus() == fStopAndKill)
{
// save only hits with energy deposit (or geantino)
if (m_EdepSum > 0 || geantino)
{
// update values at exit coordinates and set keep flag
// of track to keep
m_hit->set_x(1, postPoint->GetPosition().x() / cm);
m_hit->set_y(1, postPoint->GetPosition().y() / cm);
m_hit->set_z(1, postPoint->GetPosition().z() / cm);
m_hit->set_px(1, postPoint->GetMomentum().x() / GeV);
m_hit->set_py(1, postPoint->GetMomentum().y() / GeV);
m_hit->set_pz(1, postPoint->GetMomentum().z() / GeV);
m_hit->set_t(1, postPoint->GetGlobalTime() / nanosecond);
if (G4VUserTrackInformation *p = aTrack->GetUserInformation())
{
if (PHG4TrackUserInfoV1 *pp = dynamic_cast<PHG4TrackUserInfoV1 *>(p))
{
pp->SetKeep(1); // we want to keep the track
}
}
if (geantino)
{
m_hit->set_edep(-1);
m_hit->set_eion(-1);
}
else
{
m_hit->set_edep(m_EdepSum);
m_hit->set_eion(m_EionSum);
}
// add in container
m_SaveHitContainer->AddHit(m_hit->get_layer(), m_hit.get());
// ownership is transferred to container
// so we release the hit
m_hit.release();
} else {
m_hit->Reset();
}
}
// return true to indicate the hit was used
return true;
}
//____________________________________________________________________________..
void PHG4MicromegasSteppingAction::SetInterfacePointers(PHCompositeNode *topNode)
{
std::string hitnodename = "G4HIT_" + m_Detector->SuperDetector();
m_hitContainer = findNode::getClass<PHG4HitContainer>(topNode, hitnodename);
if (!m_hitContainer) std::cout << "PHG4MicromegasSteppingAction::SetTopNode - unable to find " << hitnodename << std::endl;
}