Author: [log in to unmask]
Date: Thu Oct 1 11:25:51 2015
New Revision: 3665
Log:
[SLIC-251] Preliminary rewrite of MCParticle event generation to correctly handle displaced vertices.
Modified:
projects/slic/trunk/include/MCParticleManager.hh
projects/slic/trunk/src/MCParticleManager.cc
Modified: projects/slic/trunk/include/MCParticleManager.hh
=============================================================================
--- projects/slic/trunk/include/MCParticleManager.hh (original)
+++ projects/slic/trunk/include/MCParticleManager.hh Thu Oct 1 11:25:51 2015
@@ -32,6 +32,7 @@
typedef map<G4int, MCParticle*> TrackIDMap;
typedef map<MCParticle*, G4PrimaryParticle*> PrimaryParticleMap;
+typedef map<G4PrimaryParticle*, MCParticle*> MCParticleMap;
typedef PrimaryParticleMap::iterator PrimaryParticleMapIterator;
typedef set<MCParticle*> MCParticleSet;
@@ -102,7 +103,7 @@
void reset() {
_trackIDMap.clear();
_primaryMap.clear();
- _visitedParticles.clear();
+ _mcpMap.clear();
_mcpVec = 0;
}
@@ -116,7 +117,7 @@
}
/**
- * Generate a G4Event from a collection of MCParticles.
+ * Generate an event from a collection of MCParticles.
* @param[in] mcparticles The MCParticle collection.
* @param[in] event The output G4Event.
*/
@@ -136,14 +137,27 @@
*/
G4double smearZPosition(const G4double rms);
-private:
+ /**
+ * Create a primary particle from an MCParticle and recursively create primaries for all its daughters.
+ * @param[in] mcp the input MCParticle
+ * @return the primary particle converted from the MCParticle
+ */
+ std::set<G4PrimaryParticle*> createPrimary(G4PrimaryParticle* parent, MCParticle* mcp);
/**
- * Get the relevant G4ParticleParticle objects from an MCParticle.
- * @param[in] p The MCParticle.
- * @return The set of relevant G4PrimaryParticle objects.
+ * Create a primary vertex from an MCParticle.
+ * @param[in] mcp the input MCParticle
+ * @return the primary vertex converted from the MCParticle
*/
- std::set<G4PrimaryParticle*> getRelevantParticles(MCParticle* p);
+ G4PrimaryVertex* createVertex(MCParticle* mcp);
+
+ /**
+ * Return true if particle is a daughter of another primary.
+ * @return true if particle is a daughter
+ */
+ bool isDaughter(G4PrimaryParticle* particle, const std::set<G4PrimaryParticle*>& primaries);
+
+private:
/**
* Set the MCParticle collection.
@@ -161,9 +175,9 @@
PrimaryParticleMap _primaryMap;
/**
- * Set keeping track of which MCParticles have been processed in generator.
+ * Reverse map of G4PrimaryParticle to MCParticle.
*/
- MCParticleSet _visitedParticles;
+ MCParticleMap _mcpMap;
/**
* Map of MCParticle to track ID.
Modified: projects/slic/trunk/src/MCParticleManager.cc
=============================================================================
--- projects/slic/trunk/src/MCParticleManager.cc (original)
+++ projects/slic/trunk/src/MCParticleManager.cc Thu Oct 1 11:25:51 2015
@@ -5,181 +5,199 @@
// Geant4
#include "G4SystemOfUnits.hh"
+#include "globals.hh"
#include "Randomize.hh"
namespace slic {
void MCParticleManager::generateEvent(LCCollectionVec* particles, G4Event* event) {
- /* Apply Z smearing to input particles. */
+#if SLIC_LOG
+ log() << LOG::head << LOG::debug << "generating event " << event->GetEventID() << " from " << particles->size() << " MCParticles" << LOG::done;
+#endif
+
+ // Apply Z smearing to input particles.
+#if SLIC_LOG
+ log() << LOG::debug << "applying Z smearing: " << EventSourceManager::instance()->getZSmearing() << LOG::done;
+#endif
G4double z = smearZPosition(EventSourceManager::instance()->getZSmearing());
- /* Apply the Lorentz Transformation to input particles. */
+ /// Apply the Lorentz Transformation to input particles.
+#if SLIC_LOG
+ log() << LOG::debug << "applying Lorentz transform: " << EventSourceManager::instance()->getLorentzTransformationAngle() << LOG::done;
+#endif
applyLorentzTransformation(particles, EventSourceManager::instance()->getLorentzTransformationAngle());
- /*
- * Process particles and add them to the primary vertex of the event.
- */
- G4ThreeVector particlePosition(0, 0, z);
- G4double particleTime;
- G4PrimaryVertex* vertex = new G4PrimaryVertex(particlePosition, particleTime);
- for(size_t i=0; i < particles->size(); i++) {
- MCParticle* mcp = (MCParticle*)(*particles)[i];
- if (mcp->getParents().size()==0) {
- //std::cout << "construct tree of relevant G4PrimaryParticles for initial MCParticle " << i << " " << std::flush;
- std::set<G4PrimaryParticle*> primaries = getRelevantParticles(mcp);
- //std::cout << "... finished" << std::endl;
- std::set<G4PrimaryParticle*>::iterator primaryIt;
- for (primaryIt = primaries.begin(); primaryIt != primaries.end(); primaryIt++) {
- vertex->SetPrimary(*primaryIt);
- //std::cout << "G4PrimaryParticle ("<< (*primaryIt)->GetPDGcode() << ") added to G4PrimaryVertex." << std::endl;
+ log() << LOG::endl;
+
+ // Loop over MCParticle input list.
+ for (size_t i = 0; i < particles->size(); i++) {
+
+ // Get the next MCParticle.
+ MCParticle* mcp = (MCParticle*) (*particles)[i];
+
+ // Debug print information about the particle.
+#ifdef SLIC_LOG
+ log() << LOG::debug << "processing MCParticle " << i << LOG::done;
+ log() << LOG::debug
+ << "PDG: " << mcp->getPDG() << LOG::endl
+ << "gen status: " << mcp->getGeneratorStatus() << LOG::endl
+ << "sim status: " << mcp->getSimulatorStatus() << LOG::endl
+ << "energy: " << mcp->getEnergy() << LOG::endl
+ << "time: " << mcp->getTime() << LOG::endl
+ << "daughters: " << mcp->getDaughters().size() << LOG::endl
+ << "vertex: ( " << mcp->getVertex()[0] << " " << mcp->getVertex()[1] << " " << mcp->getVertex()[2] << " )" << LOG::endl
+ << "p: ( " << mcp->getMomentum()[0] << ", " << mcp->getMomentum()[1] << ", " << mcp->getMomentum()[2] << " )" << LOG::endl
+ << "charge: " << mcp->getCharge() << LOG::endl
+ << "mass: " << mcp->getMass() << LOG::endl
+ << "daughters: " << mcp->getDaughters().size() << LOG::endl
+ << "parents: " << mcp->getParents().size()
+ << LOG::done;
+ log() << LOG::endl;
+#endif
+
+ // Only make vertices for particles without parents.
+ if (mcp->getParents().size() == 0) {
+
+#ifdef SLIC_LOG
+ log() << LOG::debug << "creating new vertex for MCParticle " << i << LOG::done;
+#endif
+
+ // Create a new primary vertex.
+ G4PrimaryVertex* vertex = 0;
+
+ if (mcp->getGeneratorStatus() == 1 || mcp->getGeneratorStatus() == 2) {
+ vertex = createVertex(mcp);
}
- }
- }
-
- /* Add the primary vertex to Geant4. */
- event->AddPrimaryVertex(vertex);
-
- /* Register the collection of MCParticles that was created. */
- setMCParticleCollection(particles);
-}
-
-
-std::set<G4PrimaryParticle*> MCParticleManager::getRelevantParticles(MCParticle* p) {
-
- //log each particle which has been called, to avoid double counting and increase efficiency
- _visitedParticles.insert(p);
- PrimaryParticleMap::iterator mcpIT;
- std::set<G4PrimaryParticle*> relevantParticlesSet; //holds all relevant decay particles of p
-
- /*
- * Case #1:
- *
- * If p is a stable particle: search for it in LCIO2Geant4Map
- *
- * If exists in map: get the G4PrimaryParticle version of p from LCIO2Geant4Map
- * Else: create G4PrimaryParticle version write it to LCIO2Geant4Map
- *
- * Finally: insert the G4PrimaryParticle verion of p into the relevant particle list
- * and return the list.
- */
- if (p->getGeneratorStatus() == 1) {
- G4PrimaryParticle* g4p;
- mcpIT = _primaryMap.find(p);
- if (mcpIT != _primaryMap.end()) {
- g4p = mcpIT->second;
- } else {
- G4int IDHEP = p->getPDG();
- G4double PHEP1 = p->getMomentum()[0];
- G4double PHEP2 = p->getMomentum()[1];
- G4double PHEP3 = p->getMomentum()[2];
- G4double PHEP5 = p->getMass();
- // create G4PrimaryParticle object
- g4p = new G4PrimaryParticle(IDHEP, PHEP1 * GeV, PHEP2 * GeV, PHEP3 * GeV);
- g4p->SetMass(PHEP5 * GeV);
- _primaryMap[p] = g4p;
- //std::cout << "*" << std::flush;
- }
- //std::cout << g4p->GetPDGcode() << std::flush;
- relevantParticlesSet.insert(g4p);
- return relevantParticlesSet;
- }
-
- /*
- * CASE #2:
- *
- * If p is not stable: get first decay daughter and calculate the proper time of p.
- *
- * If proper time is not zero: particle is "relevant", since it carries vertex information.
- *
- * If p is already in LCIO2Geant4Map: take it.
- * Else: create G4PrimaryParticle version of p and write it to LCIO2Geant4Map
- *
- * Collect all relevant particles of all daughters and setup "relevant mother-
- * daughter-relations" between relevant decay particles and G4PrimaryParticle version of p
- *
- * Finally: insert only the G4PrimaryParticle version of p to the relevant particle list and return this "list".
- * The added particle has now the correct pre-assigned decay products and (hopefully) the right lifetime.
- */
- else if (p->getDaughters().size() > 0) { //fg: require that there is at least one daughter - otherwise forget the particle
- // calculate proper time
- MCParticle* dp = p->getDaughters()[0];
-
- double proper_time = fabs((dp->getTime() - p->getTime()) * p->getMass()) / p->getEnergy();
- // fix by S.Morozov for real != 0
- double aPrecision = dp->getTime() * p->getMass() / p->getEnergy();
- double bPrecision = p->getTime() * p->getMass() / p->getEnergy();
-
- double proper_time_Precision = pow(10, -DBL_DIG)*fmax(fabs(aPrecision),fabs(bPrecision));
-
- bool isProperTimeZero = (proper_time <= proper_time_Precision);
-
- // -- remove original --- if (proper_time != 0) {
- if (isProperTimeZero == false) {
-
- G4PrimaryParticle* g4p;
- mcpIT = _primaryMap.find(p);
- if (mcpIT != _primaryMap.end()) {
- g4p = mcpIT->second;
- } else {
- G4int IDHEP = p->getPDG();
- G4double PHEP1 = p->getMomentum()[0];
- G4double PHEP2 = p->getMomentum()[1];
- G4double PHEP3 = p->getMomentum()[2];
- G4double PHEP5 = p->getMass();
- // create G4PrimaryParticle object
- g4p = new G4PrimaryParticle(IDHEP, PHEP1 * GeV, PHEP2 * GeV, PHEP3 * GeV);
- g4p->SetMass(PHEP5 * GeV);
- g4p->SetProperTime(proper_time * ns);
- _primaryMap[p] = g4p;
- std::set<G4PrimaryParticle*> vec3;
- for (size_t i = 0; i < p->getDaughters().size(); i++) {
- if (_visitedParticles.count(p->getDaughters()[i]) == 0) {
- std::set<G4PrimaryParticle*> vec2 = getRelevantParticles(p->getDaughters()[i]);
- std::set<G4PrimaryParticle*>::iterator setit;
- for (setit = vec2.begin(); setit != vec2.end(); setit++) {
- vec3.insert(*setit);
- }
+
+#ifdef SLIC_LOG
+ log() << LOG::debug << "creating primary for MCParticle " << i << LOG::done;
+#endif
+
+ // Create a primary particle and recursively create its daughters.
+ const std::set<G4PrimaryParticle*> primaries = createPrimary(0, mcp);
+
+ // Loop over returned set of primary particles.
+ for (std::set<G4PrimaryParticle*>::const_iterator it = primaries.begin(); it != primaries.end(); it++) {
+
+ // Is this a top-level particle with no daughters?
+ if (!MCParticleManager::isDaughter((*it), primaries)) {
+
+ // Create a new vertex if necessary.
+ if (vertex == 0) {
+ // Create vertex by looking up MCParticle from the primary.
+ vertex = createVertex(_mcpMap[(*it)]);
}
- }
- std::set<G4PrimaryParticle*>::iterator setit;
- for (setit = vec3.begin(); setit != vec3.end(); setit++) {
- g4p->SetDaughter(*setit);
- }
- //std::cout << "*" << std::flush;
- }
- //std::cout << g4p->GetPDGcode() << std::flush;
- relevantParticlesSet.insert(g4p);
- return relevantParticlesSet;
- }
- /* CASE #3:
- *
- * If p is not stable AND has zero lifetime: forget about p and retrieve all relevant
- * decay particles of all daughters of p.
- *
- * In this case this step of recursion is just there for collecting all relevant decay
- * products of daughters and returning them.
- */
- else {
- for (size_t i = 0; i < p->getDaughters().size(); i++) {
- if (_visitedParticles.count(p->getDaughters()[i]) == 0) {
- std::set<G4PrimaryParticle*> vec2 = getRelevantParticles(p->getDaughters()[i]);
- std::set<G4PrimaryParticle*>::iterator setit;
- for (setit = vec2.begin(); setit != vec2.end(); setit++) {
- relevantParticlesSet.insert(*setit);
- }
+
+ // Add the primary particle to the vertex.
+ vertex->SetPrimary(*it);
}
}
- return relevantParticlesSet;
- }
- }
- return relevantParticlesSet;
+
+ // Add the vertex to the event.
+ event->AddPrimaryVertex(vertex);
+ }
+#ifdef SLIC_LOG
+ log() << "-------------------------------------------------" << LOG::endl;
+#endif
+ }
+
+ // Register the collection of MCParticles that was created.
+ setMCParticleCollection(particles);
+}
+
+std::set<G4PrimaryParticle*> MCParticleManager::createPrimary(G4PrimaryParticle* parent, MCParticle* mcp) {
+
+ // The MCParticle argument should not be null.
+ if (mcp == 0) {
+ G4Exception("", "", FatalException, "MCParticle is null.");
+ }
+
+ // Set of primaries that will be returned.
+ std::set<G4PrimaryParticle*> primaries;
+
+ G4PrimaryParticle* primary = 0;
+
+ // Is this primary not created yet and does it have a valid generator status?
+ if (_primaryMap.count(mcp) == 0 && (mcp->getGeneratorStatus() == 1 || mcp->getGeneratorStatus() == 2)) {
+
+ // Create the primary particle from the MCParticle's information.
+ primary = new G4PrimaryParticle();
+ primary->SetPDGcode(mcp->getPDG());
+ primary->SetCharge(mcp->getCharge());
+ primary->SetMass(mcp->getMass() * GeV);
+ const double* p = mcp->getMomentum();
+ primary->SetMomentum(p[0] * GeV, p[1] * GeV, p[2] * GeV);
+
+ // Set the proper time by subtracting from daughter's time.
+ if (mcp->getDaughters().size() > 0) {
+ MCParticle* dp = mcp->getDaughters()[0];
+ double properTime = fabs((dp->getTime() - mcp->getTime()) * mcp->getMass()) / mcp->getEnergy();
+#ifdef SLIC_LOG
+ log() << LOG::debug << "proper time set to " << properTime << LOG::done;
+#endif
+ primary->SetProperTime(mcp->getTime() * ns);
+ }
+
+ // Map primary to MCParticle.
+#ifdef SLIC_LOG
+ log() << LOG::debug << "mapping MCParticle " << mcp << " to primary " << primary << LOG::done;
+#endif
+ _primaryMap[mcp] = primary;
+
+ // Map MCParticle to primary.
+ _mcpMap[primary] = mcp;
+
+ if (parent != 0) {
+#ifdef SLIC_LOG
+ log() << LOG::debug << "setting parent primary on daughter" << LOG::done;
+#endif
+ parent->SetDaughter(primary);
+ }
+
+ primaries.insert(primary);
+ }
+
+ for (int i = 0; i < mcp->getDaughters().size(); i++) {
+#ifdef SLIC_LOG
+ log() << LOG::debug << "creating primary for dau particle " << i << LOG::done;
+#endif
+ std::set<G4PrimaryParticle*> daughters = createPrimary(primary, mcp->getDaughters()[i]);
+#ifdef SLIC_LOG
+ log() << LOG::debug << "created " << daughters.size() << " daughter primaries" << LOG::done;
+#endif
+
+ primaries.insert(daughters.begin(), daughters.end());
+ }
+#ifdef SLIC_LOG
+ log().getOutputStream().flush();
+#endif
+ return primaries;
+}
+
+G4PrimaryVertex* MCParticleManager::createVertex(MCParticle* mcp) {
+
+ // Get the particle's origin.
+ const double* particleVertex = mcp->getVertex();
+ G4ThreeVector particlePosition(particleVertex[0], particleVertex[1], particleVertex[2]);
+
+ // Get the particle's time.
+ G4double particleTime = mcp->getTime();
+
+ // Create a new vertex for this particle.
+#ifdef SLIC_LOG
+ log() << LOG::debug << "creating vertex at position " << particlePosition << " with time " << particleTime << LOG::done;
+#endif
+ G4PrimaryVertex* vertex = new G4PrimaryVertex(particlePosition, particleTime);
+
+ return vertex;
}
void MCParticleManager::applyLorentzTransformation(LCCollection* particles, const G4double alpha) {
- if (alpha == 0)
+ if (alpha == 0) {
return; // nothing to do
+ }
//G4cout << "Applying Lorentz Transformation angle: " << alpha << G4endl;
@@ -206,7 +224,6 @@
// after the transformation (boost in x-direction)
pPrime[0] = betagamma * sqrt(sqr(p[0]) + sqr(p[1]) + sqr(p[2]) + sqr(m)) + gamma * p[0];
-
pPrime[1] = p[1];
pPrime[2] = p[2];
@@ -223,9 +240,23 @@
if (rms != 0) {
// Generate smeared Z position.
z = G4RandGauss::shoot(0, rms/mm);
- G4cout << "Smeared Z position: " << z << G4endl;
+ //G4cout << "Smeared Z position: " << z << G4endl;
}
return z;
}
-};
+bool MCParticleManager::isDaughter(G4PrimaryParticle* particle, const std::set<G4PrimaryParticle*>& primaries) {
+ for (std::set<G4PrimaryParticle*>::iterator it = primaries.begin(); it != primaries.end(); it++) {
+ G4PrimaryParticle* dau = (*it)->GetDaughter();
+ while (dau != 0) {
+ if (dau == particle) {
+ return true;
+ }
+ dau = dau->GetNext();
+ }
+ }
+ return false;
+}
+
+}
+;
########################################################################
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