evgen::SingleGen Class Reference

module to produce single or multiple specified particles in the detector More...

Inheritance diagram for evgen::SingleGen:

Classes
struct	Config

Public Types
using	Parameters = art::EDProducer::Table< Config >
Public Types inherited from art::EDProducer
using	ModuleType = EDProducer
using	WorkerType = WorkerT< EDProducer >
Public Types inherited from art::detail::Producer
template<typename UserConfig , typename KeysToIgnore = void>
using	Table = Modifier::Table< UserConfig, KeysToIgnore >
Public Types inherited from art::Modifier
template<typename UserConfig , typename UserKeysToIgnore = void>
using	Table = ProducerTable< UserConfig, detail::ModuleConfig, UserKeysToIgnore >

Public Member Functions
	SingleGen (Parameters const &config)
void	produce (art::Event &evt) override
Public Member Functions inherited from art::EDProducer
	EDProducer (fhicl::ParameterSet const &pset)
template<typename Config >
	EDProducer (Table< Config > const &config)
std::string	workerType () const
Public Member Functions inherited from art::detail::Producer
virtual	~Producer () noexcept
	Producer (fhicl::ParameterSet const &)
	Producer (Producer const &)=delete
	Producer (Producer &&)=delete
Producer &	operator= (Producer const &)=delete
Producer &	operator= (Producer &&)=delete
void	doBeginJob (SharedResources const &resources)
void	doEndJob ()
void	doRespondToOpenInputFile (FileBlock const &fb)
void	doRespondToCloseInputFile (FileBlock const &fb)
void	doRespondToOpenOutputFiles (FileBlock const &fb)
void	doRespondToCloseOutputFiles (FileBlock const &fb)
bool	doBeginRun (RunPrincipal &rp, ModuleContext const &mc)
bool	doEndRun (RunPrincipal &rp, ModuleContext const &mc)
bool	doBeginSubRun (SubRunPrincipal &srp, ModuleContext const &mc)
bool	doEndSubRun (SubRunPrincipal &srp, ModuleContext const &mc)
bool	doEvent (EventPrincipal &ep, ModuleContext const &mc, std::atomic< std::size_t > &counts_run, std::atomic< std::size_t > &counts_passed, std::atomic< std::size_t > &counts_failed)
Public Member Functions inherited from art::Modifier
	~Modifier () noexcept
	Modifier ()
	Modifier (Modifier const &)=delete
	Modifier (Modifier &&)=delete
Modifier &	operator= (Modifier const &)=delete
Modifier &	operator= (Modifier &&)=delete
Public Member Functions inherited from art::ModuleBase
virtual	~ModuleBase () noexcept
	ModuleBase ()
ModuleDescription const &	moduleDescription () const
void	setModuleDescription (ModuleDescription const &)
std::array< std::vector< ProductInfo >, NumBranchTypes > const &	getConsumables () const
void	sortConsumables (std::string const &current_process_name)
template<typename T , BranchType BT>
ViewToken< T >	consumesView (InputTag const &tag)
template<typename T , BranchType BT>
ViewToken< T >	mayConsumeView (InputTag const &tag)

Private Member Functions
void	SampleOne (unsigned int i, simb::MCTruth &mct)
void	SampleMany (simb::MCTruth &mct)
void	Sample (simb::MCTruth &mct)
void	printVecs (std::vector< std::string > const &list)
bool	PadVector (std::vector< double > &vec)
double	SelectFromHist (const TH1 &h)
void	SelectFromHist (const TH2 &h, double &x, double &y)
void	beginRun (art::Run &run) override
	Act on begin of run: write "RunData" information (sumdata::RunData). More...
void	setup ()
	Performs checks and initialization based on the current configuration. More...

Static Private Member Functions
static std::map< int, std::string >	makeParticleSelectionModeNames ()
	Returns a vector with the name of particle selection mode keywords. More...
static std::map< int, std::string >	makeDistributionNames ()
	Returns a vector with the name of distribution keywords. More...
template<typename OptionList >
static auto	selectOption (std::string Option, OptionList const &allowedOptions) -> decltype(auto)
	Parses an option string and returns the corresponding option number. More...
template<typename OptionList >
static std::string	presentOptions (OptionList const &allowedOptions, bool printKey, std::initializer_list< typename OptionList::value_type::first_type > exclude)
	Returns a string describing all options in the list. More...
template<typename OptionList >
static std::string	presentOptions (OptionList const &allowedOptions, bool printKey=true)
template<typename OptionList >
static std::string	optionName (typename OptionList::value_type::first_type optionKey, OptionList const &allowedOptions, std::string defName="<unknown>")
	Returns the name of the specified option key, or defName if not known. More...

Private Attributes
int	fMode
bool	fPadOutVectors
std::vector< int >	fPDG
	PDG code of particles to generate. More...
std::vector< double >	fP0
	Central momentum (GeV/c) to generate. More...
std::vector< double >	fSigmaP
	Variation in momenta (GeV/c) More...
int	fPDist
	How to distribute momenta (gaus or uniform) More...
std::vector< double >	fX0
	Central x position (cm) in world coordinates. More...
std::vector< double >	fY0
	Central y position (cm) in world coordinates. More...
std::vector< double >	fZ0
	Central z position (cm) in world coordinates. More...
std::vector< double >	fT0
	Central t position (s) in world coordinates. More...
std::vector< double >	fSigmaX
	Variation in x position (cm) More...
std::vector< double >	fSigmaY
	Variation in y position (cm) More...
std::vector< double >	fSigmaZ
	Variation in z position (cm) More...
std::vector< double >	fSigmaT
	Variation in t position (s) More...
int	fPosDist
	How to distribute xyz (gaus, or uniform) More...
int	fTDist
	How to distribute t (gaus, or uniform) More...
bool	fSingleVertex
	if true - all particles produced at the same location More...
std::vector< double >	fTheta0XZ
	Angle in XZ plane (degrees) More...
std::vector< double >	fTheta0YZ
	Angle in YZ plane (degrees) More...
std::vector< double >	fSigmaThetaXZ
	Variation in angle in XZ plane. More...
std::vector< double >	fSigmaThetaYZ
	Variation in angle in YZ plane. More...
int	fAngleDist
	How to distribute angles (gaus, uniform) More...
std::string	fHistFileName
	Filename containing histogram of momenta. More...
std::vector< std::string >	fPHist
	name of histogram of momenta More...
std::vector< std::string >	fThetaXzYzHist
	name of histogram for thetaxz/thetayz distribution More...
std::vector< std::unique_ptr< TH1 > >	hPHist
std::vector< std::unique_ptr< TH2 > >	hThetaXzYzHist
	actual TH1 for momentum distributions More...
CLHEP::HepRandomEngine &	fEngine
	actual TH2 for angle distributions - Xz on x axis . More...

Static Private Attributes
static const std::map< int, std::string >	ParticleSelectionModeNames = SingleGen::makeParticleSelectionModeNames()
	Names of all particle selection modes. More...
static const std::map< int, std::string >	DistributionNames = SingleGen::makeDistributionNames()
	Names of all distribution modes. More...
Constants for particle type extraction mode (`ParticleSelectionMode` parameter).
static constexpr int	kSelectAllParts = 0
	One particle per entry is generated. More...
static constexpr int	kSelectOneRandPart = 1
Constants for kinematic distribution options.
static constexpr int	kUNIF = 0
	Uniform distribution. More...
static constexpr int	kGAUS = 1
	Gaussian distribution. More...
static constexpr int	kHIST = 2

Additional Inherited Members
Static Public Member Functions inherited from art::EDProducer
static void	commitEvent (EventPrincipal &ep, Event &e)
Protected Member Functions inherited from art::ModuleBase
ConsumesCollector &	consumesCollector ()
template<typename T , BranchType = InEvent>
ProductToken< T >	consumes (InputTag const &)
template<typename Element , BranchType = InEvent>
ViewToken< Element >	consumesView (InputTag const &)
template<typename T , BranchType = InEvent>
void	consumesMany ()
template<typename T , BranchType = InEvent>
ProductToken< T >	mayConsume (InputTag const &)
template<typename Element , BranchType = InEvent>
ViewToken< Element >	mayConsumeView (InputTag const &)
template<typename T , BranchType = InEvent>
void	mayConsumeMany ()

Detailed Description

module to produce single or multiple specified particles in the detector

Definition at line 61 of file SingleGen_module.cc.

Member Typedef Documentation

using evgen::SingleGen::Parameters = art::EDProducer::Table<Config>

Definition at line 223 of file SingleGen_module.cc.

Constructor & Destructor Documentation

evgen::SingleGen::SingleGen ( Parameters const &  config )

explicit

Definition at line 467 of file SingleGen_module.cc.

    : EDProducer{config}
    , fMode         (selectOption(config().ParticleSelectionMode(), ParticleSelectionModeNames))
    , fPadOutVectors(config().PadOutVectors())
    , fPDG          (config().PDG())
    , fP0           (config().P0())
    , fSigmaP       (config().SigmaP())
    , fPDist        (selectOption(config().PDist(), DistributionNames))
    , fX0           (config().X0())
    , fY0           (config().Y0())
    , fZ0           (config().Z0())
    , fT0           (config().T0())
    , fSigmaX       (config().SigmaX())
    , fSigmaY       (config().SigmaY())
    , fSigmaZ       (config().SigmaZ())
    , fSigmaT       (config().SigmaT())
    , fPosDist      (selectOption(config().PosDist(), DistributionNames))
    , fTDist        (selectOption(config().TDist(), DistributionNames))
    , fSingleVertex (config().SingleVertex())
    , fTheta0XZ     (config().Theta0XZ())
    , fTheta0YZ     (config().Theta0YZ())
    , fSigmaThetaXZ (config().SigmaThetaXZ())
    , fSigmaThetaYZ (config().SigmaThetaYZ())
    , fAngleDist    (selectOption(config().AngleDist(), DistributionNames))
    , fHistFileName (config().HistogramFile())
    , fPHist        (config().PHist())
    , fThetaXzYzHist(config().ThetaXzYzHist())
    , fEngine(art::ServiceHandle<rndm::NuRandomService>()->createEngine(*this))
  {
    setup();
    rndm::NuRandomService::seed_t seed;
    if (config().Seed(seed)) {
      fEngine.setSeed(seed, 0 /* dummy? */);
    }

    produces< std::vector<simb::MCTruth> >();
    produces< sumdata::RunData, art::InRun >();

  }

Member Function Documentation

void evgen::SingleGen::beginRun ( art::Run &  run )

overrideprivatevirtual

Act on begin of run: write "RunData" information (sumdata::RunData).

Reimplemented from art::EDProducer.

Definition at line 509 of file SingleGen_module.cc.

  {
    geo::GeometryCore const& geom = *(lar::providerFrom<geo::Geometry>());
    run.put
      (std::make_unique<sumdata::RunData>(geom.DetectorName()), art::fullRun());
  }

std::map< int, std::string > evgen::SingleGen::makeDistributionNames ( )

staticprivate

Returns a vector with the name of distribution keywords.

Definition at line 387 of file SingleGen_module.cc.

                                                          {
    std::map<int, std::string> names;
    names[int(kUNIF)] = "uniform";
    names[int(kGAUS)] = "Gaussian";
    names[int(kHIST)] = "histograms";
    return names;
  } // SingleGen::makeDistributionNames()

std::map< int, std::string > evgen::SingleGen::makeParticleSelectionModeNames ( )

staticprivate

Returns a vector with the name of particle selection mode keywords.

Definition at line 380 of file SingleGen_module.cc.

                                                                   {
    std::map<int, std::string> names;
    names[int(kSelectAllParts   )] = "all";
    names[int(kSelectOneRandPart)] = "singleRandom";
    return names;
  } // SingleGen::makeParticleSelectionModeNames()

template<typename OptionList >

std::string evgen::SingleGen::optionName ( typename OptionList::value_type::first_type  optionKey, OptionList const &  allowedOptions, std::string  defName = "<unknown>"  )

staticprivate

Returns the name of the specified option key, or defName if not known.

Definition at line 451 of file SingleGen_module.cc.

    {
    auto iOption = allowedOptions.find(optionKey);
    return (iOption != allowedOptions.end())? iOption->second: defName;
  } // SingleGen::optionName()

bool evgen::SingleGen::PadVector ( std::vector< double > &  vec )

private

Definition at line 693 of file SingleGen_module.cc.

  {
    // check if the vec has the same size as fPDG
    if( vec.size() != fPDG.size() ){
      // if not padding out the vectors always cause an
      // exception to be thrown if the vector in question
      // is not the same size as the fPDG vector
      // the exception is thrown in the reconfigure method
      // that calls this one
      if     (!fPadOutVectors) return false;
      else if( fPadOutVectors){
        // if padding of vectors is desired but the vector in
        // question has more than one entry it isn't clear
        // what the padded values should be so cause
        // an exception
        if(vec.size() != 1) return false;

        // pad it out
        vec.resize(fPDG.size(), vec[0]);

      }// end if padding out vectors
    }// end if the vector size is not the same as fPDG

    return true;
  }

template<typename OptionList >

std::string evgen::SingleGen::presentOptions ( OptionList const &  allowedOptions, bool  printKey, std::initializer_list< typename OptionList::value_type::first_type >  exclude  )

staticprivate

Returns a string describing all options in the list.

Template Parameters

OptionList

type of list of options (e.g. std::map<int, std::string>)

Parameters

allowedOptions	the list of allowed options
printKey	whether to print the key of the option beside its name
excludeKeys	list of keys to be ignored (none by default)

Returns

a string with all options in a line

The result string is a list of option names, separated by commas, like in `"'apple', 'orange', 'banana'". IfprintKeyistrue`, the key of each option is also written in parentheses, like in `"'apple' (1), 'orange' (7), 'banana' (2)"`.

Definition at line 430 of file SingleGen_module.cc.

    {
    std::string msg;

    unsigned int n = 0;
    for (auto const& option: allowedOptions) {
      auto const& key = option.first;
      if (std::find(exclude.begin(), exclude.end(), key) != exclude.end())
        continue;
      if (n++ > 0) msg += ", ";
      msg += '\"' + std::string(option.second) + '\"';
      if (printKey)
        msg += " (" + std::to_string(key) + ")";
    } // for
    return msg;
  } // SingleGen::presentOptions()

template<typename OptionList >

static std::string evgen::SingleGen::presentOptions ( OptionList const &  allowedOptions, bool  printKey = true  )

inlinestaticprivate

Definition at line 363 of file SingleGen_module.cc.

      { return presentOptions(allowedOptions, printKey, {}); }

void evgen::SingleGen::printVecs ( std::vector< std::string > const &  list )

private

Definition at line 998 of file SingleGen_module.cc.

  {

    mf::LogInfo("SingleGen") << " You are using vector values for SingleGen configuration.\n   "
                             << " Some of the configuration vectors may have been padded out ,"
                             << " because they (weren't) as long as the pdg vector"
                             << " in your configuration. \n"
                             << " The new input particle configuration is:\n" ;

    std::string values;
    for(size_t i = 0; i <=1; ++i){// list.size(); ++i){

      values.append(list[i]);
      values.append(": [ ");

      for(size_t e = 0; e < fPDG.size(); ++e){
        std::stringstream buf;
        buf.width(10);
        if(i == 0 ) buf << fPDG[e]          << ", ";
        buf.precision(5);
        if(i == 1 ) buf << fP0[e]           << ", ";
        if(i == 2 ) buf << fSigmaP[e]       << ", ";
        if(i == 3 ) buf << fX0[e]           << ", ";
        if(i == 4 ) buf << fY0[e]           << ", ";
        if(i == 5 ) buf << fZ0[e]           << ", ";
        if(i == 6 ) buf << fSigmaX[e]       << ", ";
        if(i == 7 ) buf << fSigmaY[e]       << ", ";
        if(i == 8 ) buf << fSigmaZ[e]       << ", ";
        if(i == 9 ) buf << fTheta0XZ[e]     << ", ";
        if(i == 10) buf << fTheta0YZ[e]     << ", ";
        if(i == 11) buf << fSigmaThetaXZ[e] << ", ";
        if(i == 12) buf << fSigmaThetaYZ[e] << ", ";
        if(i == 13) buf << fT0[e]           << ", ";
        if(i == 14) buf << fSigmaT[e]       << ", ";
        values.append(buf.str());
      }

      values.erase(values.find_last_of(","));
      values.append(" ] \n");

    }// end loop over vector names in list

    mf::LogInfo("SingleGen") << values;

    return;
  }

void evgen::SingleGen::produce ( art::Event &  evt )

overridevirtual

unique_ptr allows ownership to be transferred to the art::Event after the put statement

Implements art::EDProducer.

Definition at line 720 of file SingleGen_module.cc.

  {

    ///unique_ptr allows ownership to be transferred to the art::Event after the put statement
    std::unique_ptr< std::vector<simb::MCTruth> > truthcol(new std::vector<simb::MCTruth>);

    simb::MCTruth truth;
    truth.SetOrigin(simb::kSingleParticle);
    Sample(truth);

    MF_LOG_DEBUG("SingleGen") << truth;

    truthcol->push_back(truth);

    evt.put(std::move(truthcol));

    return;
  }

void evgen::SingleGen::Sample ( simb::MCTruth &  mct )

private

Definition at line 964 of file SingleGen_module.cc.

  {

    switch (fMode) {
    case 0: // List generation mode: every event will have one of each
            // particle species in the fPDG array
        if (fSingleVertex){
          SampleMany(mct);
        }
        else{
          for (unsigned int i=0; i<fPDG.size(); ++i) {
            SampleOne(i,mct);
          }//end loop over particles
        }
        break;
    case 1: // Random selection mode: every event will exactly one particle
            // selected randomly from the fPDG array
      {
        CLHEP::RandFlat flat(fEngine);

        unsigned int i=flat.fireInt(fPDG.size());
        SampleOne(i,mct);
      }
      break;
    default:
      mf::LogWarning("UnrecognizeOption") << "SingleGen does not recognize ParticleSelectionMode "
                                          << fMode;
      break;
    } // switch on fMode

    return;
  }

void evgen::SingleGen::SampleMany ( simb::MCTruth &  mct )

private

Definition at line 853 of file SingleGen_module.cc.

                                            {

    CLHEP::RandFlat   flat(fEngine);
    CLHEP::RandGaussQ gauss(fEngine);

    // Choose position
    TVector3 x;
    if (fPosDist == kGAUS) {
      x[0] = gauss.fire(fX0[0], fSigmaX[0]);;
      x[1] = gauss.fire(fY0[0], fSigmaY[0]);
      x[2] = gauss.fire(fZ0[0], fSigmaZ[0]);
    }
    else {
      x[0] = fX0[0] + fSigmaX[0]*(2.0*flat.fire()-1.0);
      x[1] = fY0[0] + fSigmaY[0]*(2.0*flat.fire()-1.0);
      x[2] = fZ0[0] + fSigmaZ[0]*(2.0*flat.fire()-1.0);
    }

    double t = 0.;
    if(fTDist==kGAUS){
      t = gauss.fire(fT0[0], fSigmaT[0]);
    }
    else{
      t = fT0[0] + fSigmaT[0]*(2.0*flat.fire()-1.0);
    }

    TLorentzVector pos(x[0], x[1], x[2], t);

    // loop through particles and select momenta and angles
    for (unsigned int i(0); i<fPDG.size(); ++i){
      // Choose momentum
      double p = 0.0;
      double m = 0.0;
      if (fPDist == kGAUS) {
        p = gauss.fire(fP0[i], fSigmaP[i]);
      }
      else if (fPDist == kHIST){
        p = SelectFromHist(*(hPHist[i]));
      }
      else {
        p = fP0[i] + fSigmaP[i]*(2.0*flat.fire()-1.0);
      }

      static TDatabasePDG  pdgt;
      TParticlePDG* pdgp = pdgt.GetParticle(fPDG[i]);
      if (pdgp) m = pdgp->Mass();


      // Choose angles
      double thxz = 0;
      double thyz = 0;

      double thyzrads = 0;
      double thyzradsplussigma = 0;
      double thyzradsminussigma = 0;

      if (fAngleDist == kGAUS) {
        thxz = gauss.fire(fTheta0XZ[i], fSigmaThetaXZ[i]);
        thyz = gauss.fire(fTheta0YZ[i], fSigmaThetaYZ[i]);
      }
      else if (fAngleDist == kHIST){
        double thetaxz = 0;
        double thetayz = 0;
        SelectFromHist(*(hThetaXzYzHist[i]), thetaxz, thetayz);
        thxz = (180./M_PI)*thetaxz;
        thyz = (180./M_PI)*thetayz;
      }
      else {

        // Choose angles flat in phase space, which is flat in theta_xz
        // and flat in sin(theta_yz).

        thxz = fTheta0XZ[i] + fSigmaThetaXZ[i]*(2.0*flat.fire()-1.0);

        thyzrads = std::asin(std::sin((M_PI/180.)*(fTheta0YZ[i]))); //Taking asin of sin gives value between -Pi/2 and Pi/2 regardless of user input
        thyzradsplussigma = TMath::Min((thyzrads + ((M_PI/180.)*fabs(fSigmaThetaYZ[i]))), M_PI/2.);
        thyzradsminussigma = TMath::Max((thyzrads - ((M_PI/180.)*fabs(fSigmaThetaYZ[i]))), -M_PI/2.);

        //uncomment line to print angular variation info
        //std::cout << "Central angle: " << (180./M_PI)*thyzrads << " Max angle: " << (180./M_PI)*thyzradsplussigma << " Min angle: " << (180./M_PI)*thyzradsminussigma << std::endl;

        double sinthyzmin = std::sin(thyzradsminussigma);
        double sinthyzmax = std::sin(thyzradsplussigma);
        double sinthyz = sinthyzmin + flat.fire() * (sinthyzmax - sinthyzmin);
        thyz = (180. / M_PI) * std::asin(sinthyz);
      }

      double thxzrad=thxz*M_PI/180.0;
      double thyzrad=thyz*M_PI/180.0;

      TLorentzVector pvec(p*std::cos(thyzrad)*std::sin(thxzrad),
                        p*std::sin(thyzrad),
                        p*std::cos(thxzrad)*std::cos(thyzrad),
                        std::sqrt(p*p+m*m));

      // set track id to -i as these are all primary particles and have id <= 0
      int trackid = -1*(i+1);
      std::string primary("primary");

      simb::MCParticle part(trackid, fPDG[i], primary);
      part.AddTrajectoryPoint(pos, pvec);

      //std::cout << "Px: " <<  pvec.Px() << " Py: " << pvec.Py() << " Pz: " << pvec.Pz() << std::endl;
      //std::cout << "x: " <<  pos.X() << " y: " << pos.Y() << " z: " << pos.Z() << " time: " << pos.T() << std::endl;
      //std::cout << "YZ Angle: " << (thyzrad * (180./M_PI)) << " XZ Angle: " << (thxzrad * (180./M_PI)) << std::endl;
      mct.Add(part);
    }
  }

void evgen::SingleGen::SampleOne ( unsigned int  i, simb::MCTruth &  mct  )

private

Definition at line 742 of file SingleGen_module.cc.

                                                           {

    CLHEP::RandFlat   flat(fEngine);
    CLHEP::RandGaussQ gauss(fEngine);

    // Choose momentum
    double p = 0.0;
    double m = 0.0;
    if (fPDist == kGAUS) {
      p = gauss.fire(fP0[i], fSigmaP[i]);
    }
    else if (fPDist == kHIST){
      p = SelectFromHist(*(hPHist[i]));
    }
    else{// if (fPDist == kUNIF) {
      p = fP0[i] + fSigmaP[i]*(2.0*flat.fire()-1.0);
    }
//    else {std::cout << "do not understand the value of PDist!";}

    static TDatabasePDG  pdgt;
    TParticlePDG* pdgp = pdgt.GetParticle(fPDG[i]);
    if (pdgp) m = pdgp->Mass();

    // Choose position
    TVector3 x;
    if (fPosDist == kGAUS) {
      x[0] = gauss.fire(fX0[i], fSigmaX[i]);;
      x[1] = gauss.fire(fY0[i], fSigmaY[i]);
      x[2] = gauss.fire(fZ0[i], fSigmaZ[i]);
    }
    else {
      x[0] = fX0[i] + fSigmaX[i]*(2.0*flat.fire()-1.0);
      x[1] = fY0[i] + fSigmaY[i]*(2.0*flat.fire()-1.0);
      x[2] = fZ0[i] + fSigmaZ[i]*(2.0*flat.fire()-1.0);
    }

    double t = 0.;
    if(fTDist==kGAUS){
      t = gauss.fire(fT0[i], fSigmaT[i]);
    }
    else{
      t = fT0[i] + fSigmaT[i]*(2.0*flat.fire()-1.0);
    }

    TLorentzVector pos(x[0], x[1], x[2], t);

    // Choose angles
    double thxz = 0;
    double thyz = 0;

    double thyzrads = 0;
    double thyzradsplussigma = 0;
    double thyzradsminussigma = 0;

    if (fAngleDist == kGAUS) {
      thxz = gauss.fire(fTheta0XZ[i], fSigmaThetaXZ[i]);
      thyz = gauss.fire(fTheta0YZ[i], fSigmaThetaYZ[i]);
    }
    else if (fAngleDist == kHIST){ // Select thetaxz and thetayz from histogram
      double thetaxz = 0;
      double thetayz = 0;
      SelectFromHist(*(hThetaXzYzHist[i]), thetaxz, thetayz);
      thxz = (180./M_PI)*thetaxz;
      thyz = (180./M_PI)*thetayz;
    }
    else {

      // Choose angles flat in phase space, which is flat in theta_xz
      // and flat in sin(theta_yz).

      thxz = fTheta0XZ[i] + fSigmaThetaXZ[i]*(2.0*flat.fire()-1.0);

      thyzrads = std::asin(std::sin((M_PI/180.)*(fTheta0YZ[i]))); //Taking asin of sin gives value between -Pi/2 and Pi/2 regardless of user input
      thyzradsplussigma = TMath::Min((thyzrads + ((M_PI/180.)*fabs(fSigmaThetaYZ[i]))), M_PI/2.);
      thyzradsminussigma = TMath::Max((thyzrads - ((M_PI/180.)*fabs(fSigmaThetaYZ[i]))), -M_PI/2.);

      //uncomment line to print angular variation info
      //std::cout << "Central angle: " << (180./M_PI)*thyzrads << " Max angle: " << (180./M_PI)*thyzradsplussigma << " Min angle: " << (180./M_PI)*thyzradsminussigma << std::endl;

      double sinthyzmin = std::sin(thyzradsminussigma);
      double sinthyzmax = std::sin(thyzradsplussigma);
      double sinthyz = sinthyzmin + flat.fire() * (sinthyzmax - sinthyzmin);
      thyz = (180. / M_PI) * std::asin(sinthyz);
    }

    double thxzrad=thxz*M_PI/180.0;
    double thyzrad=thyz*M_PI/180.0;

    TLorentzVector pvec(p*std::cos(thyzrad)*std::sin(thxzrad),
                        p*std::sin(thyzrad),
                        p*std::cos(thxzrad)*std::cos(thyzrad),
                        std::sqrt(p*p+m*m));

    // set track id to -i as these are all primary particles and have id <= 0
    int trackid = -1*(i+1);
    std::string primary("primary");

    simb::MCParticle part(trackid, fPDG[i], primary);
    part.AddTrajectoryPoint(pos, pvec);

    //std::cout << "Px: " <<  pvec.Px() << " Py: " << pvec.Py() << " Pz: " << pvec.Pz() << std::endl;
    //std::cout << "x: " <<  pos.X() << " y: " << pos.Y() << " z: " << pos.Z() << " time: " << pos.T() << std::endl;
    //std::cout << "YZ Angle: " << (thyzrad * (180./M_PI)) << " XZ Angle: " << (thxzrad * (180./M_PI)) << std::endl;

    mct.Add(part);
  }

double evgen::SingleGen::SelectFromHist ( const TH1 &  h )

private

Definition at line 1047 of file SingleGen_module.cc.

  {
    CLHEP::RandFlat   flat(fEngine);

    double throw_value = h.Integral() * flat.fire();
    double cum_value(0);
    for (int i(0); i < h.GetNbinsX()+1; ++i){
      cum_value += h.GetBinContent(i);
      if (throw_value < cum_value){
        return flat.fire()*h.GetBinWidth(i) + h.GetBinLowEdge(i);
      }
    }
    return throw_value; // for some reason we've gone through all bins and failed?
  }

void evgen::SingleGen::SelectFromHist ( const TH2 &  h, double &  x, double &  y  )

private

Definition at line 1062 of file SingleGen_module.cc.

  {
    CLHEP::RandFlat   flat(fEngine);

    double throw_value = h.Integral() * flat.fire();
    double cum_value(0);
    for (int i(0); i < h.GetNbinsX()+1; ++i){
      for (int j(0); j < h.GetNbinsY()+1; ++j){
        cum_value += h.GetBinContent(i, j);
        if (throw_value < cum_value){
          x = flat.fire()*h.GetXaxis()->GetBinWidth(i) + h.GetXaxis()->GetBinLowEdge(i);
          y = flat.fire()*h.GetYaxis()->GetBinWidth(j) + h.GetYaxis()->GetBinLowEdge(j);
          return;
        }
      }
    }
    return; // for some reason we've gone through all bins and failed?
  }

template<typename OptionList >

auto evgen::SingleGen::selectOption ( std::string  Option, OptionList const &  allowedOptions  ) -> decltype(auto)

staticprivate

Parses an option string and returns the corresponding option number.

Template Parameters

OptionList

type of list of options (e.g. std::map<int, std::string>)

Parameters

Option	the string of the option to be parsed
allowedOptions	list of valid options, as key/name pairs

Returns

the key of the Option string from allowedOptions

Exceptions

std::runtime_error

if Option is not in the option list

The option string Option represent a single one among the supported options as defined in allowedOptions. The option string can be either one of the option names (the matching is not case-sensitive) or the number of the option itself.

OptionList requirements

OptionList must behave like a sequence with forward iterators. Each element must behave as a pair, whose first element is the option key and the second element is the option name, equivalent to a string in that it must be forward-iterable and its elements can be converted by std::tolower(). The key type has no requirements beside being copiable.

Definition at line 403 of file SingleGen_module.cc.

  {
    using key_type = typename OptionList::value_type::first_type;
    using tolower_type = int(*)(int);
    auto toLower = [](auto const& S)
      {
        std::string s;
        s.reserve(S.size());
        std::transform(S.cbegin(), S.cend(), std::back_inserter(s),
          (tolower_type) &std::tolower);
        return s;
      };
    auto option = toLower(Option);
    for (auto const& candidate: allowedOptions) {
      if (toLower(candidate.second) == option) return candidate.first;
    }
    try {
      std::size_t end;
      key_type num = std::stoi(Option, &end);
      if (allowedOptions.count(num) && (end == Option.length())) return num;
    }
    catch (std::invalid_argument const&) {}
    throw std::runtime_error("Option '" + Option + "' not supported.");
  } // SingleGen::selectOption()

void evgen::SingleGen::setup ( )

private

Performs checks and initialization based on the current configuration.

Definition at line 518 of file SingleGen_module.cc.

  {
    // do not put seed in reconfigure because we don't want to reset
    // the seed midstream
    std::vector<std::string> vlist(15);
    vlist[0]  = "PDG";
    vlist[1]  = "P0";
    vlist[2]  = "SigmaP";
    vlist[3]  = "X0";
    vlist[4]  = "Y0";
    vlist[5]  = "Z0";
    vlist[6]  = "SigmaX";
    vlist[7]  = "SigmaY";
    vlist[8]  = "SigmaZ";
    vlist[9]  = "Theta0XZ";
    vlist[10] = "Theta0YZ";
    vlist[11] = "SigmaThetaXZ";
    vlist[12] = "SigmaThetaYZ";
    vlist[13] = "T0";
    vlist[14] = "SigmaT";

//    vlist[15] = "PHist";
//    vlist[16] = "ThetaHist";
//    vlist[17] = "PhiHist";

    // begin tests for multiple particle error possibilities
    std::string list;
    if (fPDist != kHIST) {
      if( !this->PadVector(fP0          ) ){ list.append(vlist[1].append(", \n")); }
      if( !this->PadVector(fSigmaP      ) ){ list.append(vlist[2].append(", \n")); }
    }
    if( !this->PadVector(fX0          ) ){ list.append(vlist[3].append(", \n")); }
    if( !this->PadVector(fY0          ) ){ list.append(vlist[4].append(", \n")); }
    if( !this->PadVector(fZ0          ) ){ list.append(vlist[5].append(", \n")); }
    if( !this->PadVector(fSigmaX      ) ){ list.append(vlist[6].append(", \n")); }
    if( !this->PadVector(fSigmaY      ) ){ list.append(vlist[7].append(", \n")); }
    if( !this->PadVector(fSigmaZ      ) ){ list.append(vlist[8].append(", \n")); }
    if( !this->PadVector(fTheta0XZ    ) ){ list.append(vlist[9].append(", \n")); }
    if( !this->PadVector(fTheta0YZ    ) ){ list.append(vlist[10].append(", \n")); }
    if( !this->PadVector(fSigmaThetaXZ) ){ list.append(vlist[11].append(", \n")); }
    if( !this->PadVector(fSigmaThetaYZ) ){ list.append(vlist[12].append("  \n")); }
    if( !this->PadVector(fT0          ) ){ list.append(vlist[13].append(", \n")); }
    if( !this->PadVector(fSigmaT      ) ){ list.append(vlist[14].append(", \n")); }



    if(list.size() > 0)
      throw cet::exception("SingleGen") << "The "<< list
                                        << "\n vector(s) defined in the fhicl files has/have "
                                        << "a different size than the PDG vector "
                                        << "\n and it has (they have) more than one value, "
                                        << "\n disallowing sensible padding "
                                        << " and/or you have set fPadOutVectors to false. \n";

    if(fPDG.size() > 1 && fPadOutVectors) this->printVecs(vlist);

    // If needed, get histograms for momentum and angle distributions
    TFile* histFile = nullptr;
    if (!fHistFileName.empty()) {
      if (fHistFileName[0] == '/') {
        // We have an absolute path, use given name exactly.
        if (cet::file_exists(fHistFileName)) {
          histFile = new TFile(fHistFileName.c_str());
          if (!histFile || histFile->IsZombie() || !histFile->IsOpen()) {
            delete histFile;
            histFile = nullptr;
            throw art::Exception(art::errors::NotFound) << "Cannot open ROOT file specified in parameter HistogramFile: \"" << fHistFileName << "\"";
          }
        }
        else {
          throw art::Exception(art::errors::NotFound) << "ROOT file specified in parameter HistogramFile: \"" << fHistFileName << "\" does not exist!";
        }
      }
      else {
        // We have a relative path, search starting from current directory.
        std::string relative_filename{"./"};
        relative_filename += fHistFileName;
        if (cet::file_exists(relative_filename)) {
          histFile = new TFile(relative_filename.c_str());
          if (!histFile || histFile->IsZombie() || !histFile->IsOpen()) {
            delete histFile;
            histFile = nullptr;
            throw art::Exception(art::errors::NotFound) << "Cannot open ROOT file found using relative path and originally specified in parameter HistogramFile: \"" << relative_filename << '"';
          }
        }
        else {
          cet::search_path sp{"FW_SEARCH_PATH"};
          std::string found_filename;
          auto found = sp.find_file(fHistFileName, found_filename);
          if (!found) {
            throw art::Exception(art::errors::NotFound) << "Cannot find ROOT file in current directory nor on FW_SEARCH_PATH specified in parameter HistogramFile: \"" << fHistFileName << '"';
          }
          histFile = new TFile(found_filename.c_str());
          if (!histFile || histFile->IsZombie() || !histFile->IsOpen()) {
            delete histFile;
            histFile = nullptr;
            throw art::Exception(art::errors::NotFound) << "Cannot open ROOT file found on FW_SEARCH_PATH and originally specified in parameter HistogramFile: \"" << found_filename << '"';
          }
        }
      }
    }

    //
    // deal with position distribution
    //
    switch (fPosDist) {
      case kGAUS: case kUNIF: break; // supported, no further action needed
      default:
        throw art::Exception(art::errors::Configuration)
          << "Position distribution of type '"
          << optionName(fPosDist, DistributionNames)
          << "' (" << std::to_string(fPosDist) << ") is not supported.";
    } // switch(fPosDist)

    //
    // deal with time distribution
    //
    switch (fTDist) {
      case kGAUS: case kUNIF: break; // supported, no further action needed
      default:
        throw art::Exception(art::errors::Configuration)
          << "Time distribution of type '"
          << optionName(fTDist, DistributionNames)
          << "' (" << std::to_string(fTDist) << ") is not supported.";
    } // switch(fTDist)

    //
    // deal with momentum distribution
    //
    switch (fPDist) {
      case kHIST:
        if (fPHist.size() != fPDG.size()) {
          throw art::Exception(art::errors::Configuration)
            << fPHist.size() << " momentum histograms to describe " << fPDG.size() << " particle types...";
        }
        hPHist.reserve(fPHist.size());
        for (auto const& histName: fPHist) {
          TH1* pHist = dynamic_cast<TH1*>(histFile->Get(histName.c_str()));
          if (!pHist) {
            throw art::Exception(art::errors::NotFound)
             << "Failed to read momentum histogram '" << histName << "' from '" << histFile->GetPath() << "\'";
          }
          pHist->SetDirectory(nullptr); // make it independent of the input file
          hPHist.emplace_back(pHist);
        } // for
        break;
      default: // supported, no further action needed
        break;
    } // switch(fPDist)

    switch (fAngleDist) {
      case kHIST:
        if (fThetaXzYzHist.size() != fPDG.size()) {
          throw art::Exception(art::errors::Configuration)
            << fThetaXzYzHist.size() << " direction histograms to describe " << fPDG.size() << " particle types...";
        }
        hThetaXzYzHist.reserve(fThetaXzYzHist.size());
        for (auto const& histName: fThetaXzYzHist) {
          TH2* pHist = dynamic_cast<TH2*>(histFile->Get(histName.c_str()));
          if (!pHist) {
            throw art::Exception(art::errors::NotFound)
             << "Failed to read direction histogram '" << histName << "' from '" << histFile->GetPath() << "\'";
          }
          pHist->SetDirectory(nullptr); // make it independent of the input file
          hThetaXzYzHist.emplace_back(pHist);
        } // for
      default: // supported, no further action needed
        break;
    } // switch(fAngleDist)

    delete histFile;

  }

Member Data Documentation

const std::map< int, std::string > evgen::SingleGen::DistributionNames = SingleGen::makeDistributionNames()

staticprivate

Names of all distribution modes.

Definition at line 236 of file SingleGen_module.cc.

int evgen::SingleGen::fAngleDist

private

How to distribute angles (gaus, uniform)

Definition at line 288 of file SingleGen_module.cc.

CLHEP::HepRandomEngine& evgen::SingleGen::fEngine

private

actual TH2 for angle distributions - Xz on x axis .

art-managed random-number engine

Definition at line 299 of file SingleGen_module.cc.

std::string evgen::SingleGen::fHistFileName

private

Filename containing histogram of momenta.

Definition at line 289 of file SingleGen_module.cc.

int evgen::SingleGen::fMode

private

Particle Selection Mode 0–generate a list of all particles, 1–generate a single particle selected randomly from the list

Definition at line 262 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fP0

private

Central momentum (GeV/c) to generate.

Definition at line 270 of file SingleGen_module.cc.

bool evgen::SingleGen::fPadOutVectors

private

Select to pad out configuration vectors if they are not of of the same length as PDG false: don't pad out - all values need to specified true: pad out - default values assumed and printed out

Definition at line 265 of file SingleGen_module.cc.

std::vector<int> evgen::SingleGen::fPDG

private

PDG code of particles to generate.

Definition at line 269 of file SingleGen_module.cc.

int evgen::SingleGen::fPDist

private

How to distribute momenta (gaus or uniform)

Definition at line 272 of file SingleGen_module.cc.

std::vector<std::string> evgen::SingleGen::fPHist

private

name of histogram of momenta

Definition at line 290 of file SingleGen_module.cc.

int evgen::SingleGen::fPosDist

private

How to distribute xyz (gaus, or uniform)

Definition at line 281 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fSigmaP

private

Variation in momenta (GeV/c)

Definition at line 271 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fSigmaT

private

Variation in t position (s)

Definition at line 280 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fSigmaThetaXZ

private

Variation in angle in XZ plane.

Definition at line 286 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fSigmaThetaYZ

private

Variation in angle in YZ plane.

Definition at line 287 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fSigmaX

private

Variation in x position (cm)

Definition at line 277 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fSigmaY

private

Variation in y position (cm)

Definition at line 278 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fSigmaZ

private

Variation in z position (cm)

Definition at line 279 of file SingleGen_module.cc.

bool evgen::SingleGen::fSingleVertex

private

if true - all particles produced at the same location

Definition at line 283 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fT0

private

Central t position (s) in world coordinates.

Definition at line 276 of file SingleGen_module.cc.

int evgen::SingleGen::fTDist

private

How to distribute t (gaus, or uniform)

Definition at line 282 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fTheta0XZ

private

Angle in XZ plane (degrees)

Definition at line 284 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fTheta0YZ

private

Angle in YZ plane (degrees)

Definition at line 285 of file SingleGen_module.cc.

std::vector<std::string> evgen::SingleGen::fThetaXzYzHist

private

name of histogram for thetaxz/thetayz distribution

Definition at line 291 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fX0

private

Central x position (cm) in world coordinates.

Definition at line 273 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fY0

private

Central y position (cm) in world coordinates.

Definition at line 274 of file SingleGen_module.cc.

std::vector<double> evgen::SingleGen::fZ0

private

Central z position (cm) in world coordinates.

Definition at line 275 of file SingleGen_module.cc.

std::vector<std::unique_ptr<TH1> > evgen::SingleGen::hPHist

private

Definition at line 293 of file SingleGen_module.cc.

std::vector<std::unique_ptr<TH2> > evgen::SingleGen::hThetaXzYzHist

private

actual TH1 for momentum distributions

Definition at line 294 of file SingleGen_module.cc.

constexpr int evgen::SingleGen::kGAUS = 1

staticprivate

Gaussian distribution.

Definition at line 258 of file SingleGen_module.cc.

constexpr int evgen::SingleGen::kHIST = 2

staticprivate

Distribution from histograms.

Definition at line 259 of file SingleGen_module.cc.

constexpr int evgen::SingleGen::kSelectAllParts = 0

staticprivate

One particle per entry is generated.

Definition at line 250 of file SingleGen_module.cc.

constexpr int evgen::SingleGen::kSelectOneRandPart = 1

staticprivate

One particle is generated, extracted from the provided options.

Definition at line 251 of file SingleGen_module.cc.

constexpr int evgen::SingleGen::kUNIF = 0

staticprivate

Uniform distribution.

Definition at line 257 of file SingleGen_module.cc.

const std::map< int, std::string > evgen::SingleGen::ParticleSelectionModeNames = SingleGen::makeParticleSelectionModeNames()

staticprivate

Names of all particle selection modes.

Definition at line 234 of file SingleGen_module.cc.

---

The documentation for this class was generated from the following file:

• larsim/larsim/EventGenerator/SingleGen_module.cc