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BeamLineMagnetSteppingAction.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file BeamLineMagnetSteppingAction.cc
3 
5 
6 #include <phparameter/PHParameters.h>
7 
8 #include <g4main/PHG4Hit.h>
10 #include <g4main/PHG4Hitv1.h>
11 #include <g4main/PHG4Shower.h>
12 #include <g4main/PHG4SteppingAction.h> // for PHG4SteppingAction
14 
15 #include <phool/getClass.h>
16 
17 #include <TSystem.h>
18 
19 #include <Geant4/G4ParticleDefinition.hh> // for G4ParticleDefinition
20 #include <Geant4/G4ReferenceCountedHandle.hh> // for G4ReferenceCountedHandle
21 #include <Geant4/G4Step.hh>
22 #include <Geant4/G4StepPoint.hh> // for G4StepPoint
23 #include <Geant4/G4StepStatus.hh> // for fGeomBoundary, fAtRest...
24 #include <Geant4/G4String.hh> // for G4String
25 #include <Geant4/G4SystemOfUnits.hh>
26 #include <Geant4/G4ThreeVector.hh> // for G4ThreeVector
27 #include <Geant4/G4TouchableHandle.hh> // for G4TouchableHandle
28 #include <Geant4/G4Track.hh> // for G4Track
29 #include <Geant4/G4TrackStatus.hh> // for fStopAndKill
30 #include <Geant4/G4Types.hh> // for G4double
31 #include <Geant4/G4VPhysicalVolume.hh> // for G4VPhysicalVolume
32 #include <Geant4/G4VTouchable.hh> // for G4VTouchable
33 #include <Geant4/G4VUserTrackInformation.hh> // for G4VUserTrackInformation
34 
35 #include <cmath> // for isfinite
36 #include <iostream>
37 #include <string> // for operator<<, string
38 
39 class PHCompositeNode;
40 
41 //____________________________________________________________________________..
43  : PHG4SteppingAction(detector->GetName())
44  , m_Detector(detector)
45  , m_Params(parameters)
46  , m_ActiveFlag(m_Params->get_int_param("active"))
47  , m_AbsorberActiveFlag(m_Params->get_int_param("absorberactive"))
48  , m_BlackHoleFlag(m_Params->get_int_param("blackhole"))
49 {
50 }
51 
53 {
54  // if the last hit was a zero energie deposit hit, it is just reset
55  // and the memory is still allocated, so we need to delete it here
56  // if the last hit was saved, hit is a nullptr pointer which are
57  // legal to delete (it results in a no operation)
58  delete m_Hit;
59 }
60 
61 //____________________________________________________________________________..
62 bool BeamLineMagnetSteppingAction::UserSteppingAction(const G4Step* aStep, bool /*was_used*/)
63 {
66  // get volume of the current step
68  // IsInVTX(volume) returns
69  // == 0 outside of pstof
70  // > 0 for hits in active volume
71  // < 0 for hits in passive material
72  int whichactive = m_Detector->IsInBeamLineMagnet(volume);
73  if (!whichactive)
74  {
75  return false;
76  }
77 
78  // collect energy and track length step by step
80  const G4Track* aTrack = aStep->GetTrack();
81 
82  // if this block stops everything ONLY if in the magnet iron, just put all kinetic energy into edep
83  if (whichactive == -1)
84  {
85  if (m_BlackHoleFlag)
86  {
87  edep = aTrack->GetKineticEnergy() / GeV;
88  G4Track* killtrack = const_cast<G4Track*>(aTrack);
89  killtrack->SetTrackStatus(fStopAndKill);
90  }
92  {
93  return false;
94  }
95  }
96  if (whichactive == -2)
97  {
98  edep = aTrack->GetKineticEnergy() / GeV;
99  G4Track* killtrack = const_cast<G4Track*>(aTrack);
100  killtrack->SetTrackStatus(fStopAndKill);
101  }
102  if (!m_ActiveFlag)
103  {
104  return false;
105  }
106 
107  int magnet_id = volume->GetCopyNo(); // magnet id is stored in copy number
108  bool geantino = false;
109  // the check for the pdg code speeds things up, I do not want to make
110  // an expensive string compare for every track when we know
111  // geantino or chargedgeantino has pid=0
112  if (aTrack->GetParticleDefinition()->GetPDGEncoding() == 0 &&
113  aTrack->GetParticleDefinition()->GetParticleName().find("geantino") != std::string::npos)
114  {
115  geantino = true;
116  }
117  G4StepPoint* prePoint = aStep->GetPreStepPoint();
118  G4StepPoint* postPoint = aStep->GetPostStepPoint();
119  // std::cout << "track id " << aTrack->GetTrackID() << std::endl;
120  // std::cout << "time prepoint: " << prePoint->GetGlobalTime() << std::endl;
121  // std::cout << "time postpoint: " << postPoint->GetGlobalTime() << std::endl;
122 
123  switch (prePoint->GetStepStatus())
124  {
125  case fPostStepDoItProc:
127  {
128  break;
129  }
130  else
131  {
132  std::cout << GetName() << ": New Hit for " << std::endl;
133  std::cout << "prestep status: " << PHG4StepStatusDecode::GetStepStatus(prePoint->GetStepStatus())
134  << ", poststep status: " << PHG4StepStatusDecode::GetStepStatus(postPoint->GetStepStatus())
135  << ", last pre step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePreStepStatus)
136  << ", last post step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePostStepStatus) << std::endl;
137  std::cout << "last track: " << m_SaveTrackId
138  << ", current trackid: " << aTrack->GetTrackID() << std::endl;
139  std::cout << "phys pre vol: " << volume->GetName()
140  << " post vol : " << touchpost->GetVolume()->GetName() << std::endl;
141  std::cout << " previous phys pre vol: " << m_SaveVolPre->GetName()
142  << " previous phys post vol: " << m_SaveVolPost->GetName() << std::endl;
143  }
144  [[fallthrough]];
145  case fGeomBoundary:
146  case fUndefined:
147  if (!m_Hit)
148  {
149  m_Hit = new PHG4Hitv1();
150  }
151  m_Hit->set_layer(magnet_id);
152  //here we set the entrance values in cm
153  m_Hit->set_x(0, prePoint->GetPosition().x() / cm);
154  m_Hit->set_y(0, prePoint->GetPosition().y() / cm);
155  m_Hit->set_z(0, prePoint->GetPosition().z() / cm);
156  // time in ns
157  m_Hit->set_t(0, prePoint->GetGlobalTime() / nanosecond);
158  //set the track ID
159  m_Hit->set_trkid(aTrack->GetTrackID());
160  m_SaveTrackId = aTrack->GetTrackID();
162  {
163  if (PHG4TrackUserInfoV1* pp = dynamic_cast<PHG4TrackUserInfoV1*>(p))
164  {
165  m_Hit->set_trkid(pp->GetUserTrackId());
166  }
167  }
168  //set the initial energy deposit
169  m_EdepSum = 0;
170  if (whichactive > 0)
171  {
173  }
174  else
175  {
177  }
179  {
180  if (PHG4TrackUserInfoV1* pp = dynamic_cast<PHG4TrackUserInfoV1*>(p))
181  {
182  m_Hit->set_trkid(pp->GetUserTrackId());
183  pp->GetShower()->add_g4hit_id(m_SaveHitContainer->GetID(), m_Hit->get_hit_id());
184  }
185  }
186 
187  break;
188  default:
189  break;
190  }
191 
192  // some sanity checks for inconsistencies
193  // check if this hit was created, if not print out last post step status
194  if (!m_Hit || !std::isfinite(m_Hit->get_x(0)))
195  {
196  std::cout << GetName() << ": hit was not created" << std::endl;
197  std::cout << "prestep status: " << PHG4StepStatusDecode::GetStepStatus(prePoint->GetStepStatus())
198  << ", poststep status: " << PHG4StepStatusDecode::GetStepStatus(postPoint->GetStepStatus())
199  << ", last pre step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePreStepStatus)
200  << ", last post step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePostStepStatus) << std::endl;
201  std::cout << "last track: " << m_SaveTrackId
202  << ", current trackid: " << aTrack->GetTrackID() << std::endl;
203  std::cout << "phys pre vol: " << volume->GetName()
204  << " post vol : " << touchpost->GetVolume()->GetName() << std::endl;
205  std::cout << " previous phys pre vol: " << m_SaveVolPre->GetName()
206  << " previous phys post vol: " << m_SaveVolPost->GetName() << std::endl;
207  gSystem->Exit(1);
208  }
209  // check if track id matches the initial one when the hit was created
210  if (aTrack->GetTrackID() != m_SaveTrackId)
211  {
212  std::cout << GetName() << ": hits do not belong to the same track" << std::endl;
213  std::cout << "saved track: " << m_SaveTrackId
214  << ", current trackid: " << aTrack->GetTrackID()
215  << ", prestep status: " << prePoint->GetStepStatus()
216  << ", previous post step status: " << m_SavePostStepStatus
217  << std::endl;
218 
219  gSystem->Exit(1);
220  }
221  m_SavePreStepStatus = prePoint->GetStepStatus();
222  m_SavePostStepStatus = postPoint->GetStepStatus();
224  m_SaveVolPost = touchpost->GetVolume();
225 
226  // here we just update the exit values, it will be overwritten
227  // for every step until we leave the volume or the particle
228  // ceases to exist
229  //sum up the energy to get total deposited
230  m_EdepSum += edep;
231  // if any of these conditions is true this is the last step in
232  // this volume and we need to save the hit
233  // postPoint->GetStepStatus() == fGeomBoundary: track leaves this volume
234  // postPoint->GetStepStatus() == fWorldBoundary: track leaves this world
235  // (happens when your detector goes outside world volume)
236  // postPoint->GetStepStatus() == fAtRestDoItProc: track stops (typically
237  // aTrack->GetTrackStatus() == fStopAndKill is also set)
238  // aTrack->GetTrackStatus() == fStopAndKill: track ends
239  if (postPoint->GetStepStatus() == fGeomBoundary ||
240  postPoint->GetStepStatus() == fWorldBoundary ||
241  postPoint->GetStepStatus() == fAtRestDoItProc ||
242  aTrack->GetTrackStatus() == fStopAndKill)
243  {
244  // save only hits with energy deposit (or geantino)
245  if (m_EdepSum > 0 || geantino)
246  {
247  // update values at exit coordinates and set keep flag
248  // of track to keep
249  m_Hit->set_x(1, postPoint->GetPosition().x() / cm);
250  m_Hit->set_y(1, postPoint->GetPosition().y() / cm);
251  m_Hit->set_z(1, postPoint->GetPosition().z() / cm);
252 
253  m_Hit->set_t(1, postPoint->GetGlobalTime() / nanosecond);
255  {
256  if (PHG4TrackUserInfoV1* pp = dynamic_cast<PHG4TrackUserInfoV1*>(p))
257  {
258  pp->SetKeep(1); // we want to keep the track
259  }
260  }
261  if (geantino)
262  {
263  m_Hit->set_edep(-1); // only energy=0 g4hits get dropped, this way geantinos survive the g4hit compression
264  }
265  else
266  {
268  }
269  m_SaveHitContainer->AddHit(magnet_id, m_Hit);
270  // ownership has been transferred to container, set to null
271  // so we will create a new hit for the next track
272  m_Hit = nullptr;
273  }
274  else
275  {
276  // if this hit has no energy deposit, just reset it for reuse
277  // this means we have to delete it in the dtor. If this was
278  // the last hit we processed the memory is still allocated
279  m_Hit->Reset();
280  }
281  }
282  // return true to indicate the hit was used
283  return true;
284 }
285 
286 //____________________________________________________________________________..
288 {
289  m_HitContainer = findNode::getClass<PHG4HitContainer>(topNode, m_HitNodeName);
290  m_AbsorberHitContainer = findNode::getClass<PHG4HitContainer>(topNode, m_AbsorberNodeName);
291 
292  // If this is a black hole but otherwise not an active detector there is
293  // no hitnode, otherwise this will crash in the user stepping action
294  if (!m_HitContainer)
295  {
296  if (!m_BlackHoleFlag)
297  {
298  std::cout << "BeamLineMagnetSteppingAction::SetTopNode - unable to find " << m_HitNodeName << std::endl;
299  }
300  }
301  if (!m_AbsorberHitContainer)
302  {
303  if (Verbosity() > 1)
304  {
305  std::cout << "BeamLineMagnetSteppingAction::SetTopNode - unable to find " << m_AbsorberNodeName << std::endl;
306  }
307  }
308 }
309 
310 void BeamLineMagnetSteppingAction::SetHitNodeName(const std::string &type, const std::string &name)
311 {
312  if (type == "G4HIT")
313  {
315  return;
316  }
317  else if (type == "G4HIT_ABSORBER")
318  {
320  return;
321  }
322  std::cout << "Invalid output hit node type " << type << std::endl;
323  gSystem->Exit(1);
324  return;
325 }