JTRIGGER::JK40RunByRunSimulator Class Reference

K40 simulation based on run-by-run information. More...

#include <JK40RunByRunSimulator.hh>

Inheritance diagram for JTRIGGER::JK40RunByRunSimulator:

Public Member Functions
	JK40RunByRunSimulator (const JSummaryRouter &router, const JK40Rates &rates)
	Constructor. More...
virtual double	getSinglesRate (const JPMTIdentifier &pmt) const override
	Get singles rate as a function of PMT. More...
double	getSinglesRate () const
	Get singles rate. More...
virtual double	getMultiplesRate (const JModuleIdentifier &module, const int M) const override
	Get multiples rate as a function of optical module. More...
double	getMultiplesRate (const multiplicity_type M) const
	Get multiples rate. More...
virtual double	getProbability (const double ct) const override
	Get probability of coincidence. More...
virtual void	generateHits (const JModule &module, const JTimeRange &period, JModuleData &output) const
	Generate hits. More...
multiplicity_type	getLowerL1Multiplicity () const
	Get lower multiplicty. More...
multiplicity_type	getUpperL1Multiplicity () const
	Get upper multiplicty. More...
void	correct (const double QE)
	Correct rates for global efficiency,. More...

Static Public Member Functions
static JK40DefaultSimulator &	getInstance ()
	Get reference to unique instance of this class object. More...
static unsigned int	getRandomIndex (const JBuffer1D_t &buffer, const double random)
	Get index based on random value. More...
static double	getSigma ()
	Get intrinsic time smearing of K40 coincidences. More...

Static Public Attributes
static const multiplicity_type	LOWER_L1_MULTIPLICITY = 2
	Lower L1 multiplicity. More...

Static Protected Member Functions
static double	p1 ()
	Parameters for probability of coincidence as a function of the cosine of space angle between PMT axes. More...
static double	p2 ()
static double	p3 ()
static double	p4 ()

Protected Attributes
const JSummaryRouter &	summary_router
JRateL0_t	rateL0
	singles rate [Hz] More...
JRateL1_t	rateL1
	multiples rates [Hz] More...

Detailed Description

K40 simulation based on run-by-run information.

This class overwrites the method JK40DefaultSimulator::getSinglesRate. The actual singles rate is obtained from summary data.

Definition at line 33 of file JK40RunByRunSimulator.hh.

Constructor & Destructor Documentation

JTRIGGER::JK40RunByRunSimulator::JK40RunByRunSimulator ( const JSummaryRouter &  router, const JK40Rates &  rates  )

inline

Constructor.

Parameters

router	summary router
rates	K40 rates [Hz]

Definition at line 43 of file JK40RunByRunSimulator.hh.

                                                       :
      JK40DefaultSimulator(rates),
      summary_router(router)
    {}

Member Function Documentation

virtual double JTRIGGER::JK40RunByRunSimulator::getSinglesRate ( const JPMTIdentifier &  pmt ) const

inlineoverridevirtual

Get singles rate as a function of PMT.

Parameters

pmt	PMT identifier

Returns

rate [Hz]

Reimplemented from JDETECTOR::JK40DefaultSimulator.

Definition at line 56 of file JK40RunByRunSimulator.hh.

    {
      if (summary_router.hasSummaryFrame(pmt.getModuleID())) {

        const JDAQSummaryFrame& frame = summary_router.getSummaryFrame(pmt.getModuleID());

        return getRate(frame, pmt.getPMTAddress());
      }

      return 0.0;
    }

static JK40DefaultSimulator& JDETECTOR::JK40DefaultSimulator::getInstance ( )

inlinestaticinherited

Get reference to unique instance of this class object.

This method returns an object with default values. The singles and multiples rates are taken from KM3NeT internal note "Detector simulations for KM3NeT".

Returns

reference to this class object

Definition at line 62 of file JK40DefaultSimulator.hh.

    {
      static JK40DefaultSimulator k40Simulator(KM3NET::getK40Rates());

      return k40Simulator;
    }

double JPHYSICS::JK40Rates::getSinglesRate ( ) const

inlineinherited

Get singles rate.

Returns

rate [Hz]

Definition at line 71 of file JK40Rates.hh.

    {
      return rateL0;
    }

virtual double JDETECTOR::JK40DefaultSimulator::getMultiplesRate ( const JModuleIdentifier &  module, const int  M  ) const

inlineoverridevirtualinherited

Get multiples rate as a function of optical module.

Parameters

module	optical module identifier
M	multiplicity (M >= 2)

Returns

rate [Hz]

Implements JDETECTOR::JK40DefaultSimulatorInterface.

Definition at line 89 of file JK40DefaultSimulator.hh.

    {
      return JK40Rates::getMultiplesRate(M);
    }

double JPHYSICS::JK40Rates::getMultiplesRate ( const multiplicity_type  M ) const

inlineinherited

Get multiples rate.

Parameters

M	multiplicity (M >= JK40Rates::LOWER_L1_MULTIPLICITY)

Returns

rate [Hz]

Definition at line 83 of file JK40Rates.hh.

    {
      if (M >= LOWER_L1_MULTIPLICITY && M - LOWER_L1_MULTIPLICITY < (multiplicity_type) rateL1.size())
        return rateL1[M - LOWER_L1_MULTIPLICITY];
      else
        return 0.0;
    }

virtual double JDETECTOR::JK40DefaultSimulator::getProbability ( const double  ct ) const

inlineoverridevirtualinherited

Get probability of coincidence.

Parameters

ct	cosine space angle between PMT axes

Returns

probability

Implements JDETECTOR::JK40DefaultSimulatorInterface.

Definition at line 101 of file JK40DefaultSimulator.hh.

    {
      return exp(ct * (p1() + ct * (p2() + ct * (p3() + ct*p4()))));
    }

static double JDETECTOR::JK40DefaultSimulator::p1 ( )

inlinestaticprotectedinherited

Parameters for probability of coincidence as a function of the cosine of space angle between PMT axes.

Values are provided by V.Kulikovski.

Definition at line 160 of file JK40DefaultSimulator.hh.

{ return  3.0767; }

static double JDETECTOR::JK40DefaultSimulator::p2 ( )

inlinestaticprotectedinherited

Definition at line 161 of file JK40DefaultSimulator.hh.

{ return -1.2078; }

static double JDETECTOR::JK40DefaultSimulator::p3 ( )

inlinestaticprotectedinherited

Definition at line 162 of file JK40DefaultSimulator.hh.

{ return  0.9905; }

static double JDETECTOR::JK40DefaultSimulator::p4 ( )

inlinestaticprotectedinherited

Definition at line 163 of file JK40DefaultSimulator.hh.

{ return  0.9379; }

virtual void JDETECTOR::JK40DefaultSimulatorInterface::generateHits ( const JModule &  module, const JTimeRange &  period, JModuleData &  output  ) const

inlinevirtualinherited

Generate hits.

Parameters

module	module
period	time window [ns]
output	background data

Implements JDETECTOR::JK40Simulator.

Definition at line 112 of file JK40DefaultSimulatorInterface.hh.

    {

      // resize internal buffers
      
      const int N = module.size();

      probability2D.resize(N);
      probability1D.resize(N);
      probabilityND.resize(N);

      rateL1_Hz.resize(N);


      // generate singles

      for (int pmt = 0; pmt != N; ++pmt) {

        const double rateL0_Hz = getSinglesRate(JPMTIdentifier(module.getID(), pmt));

        if (rateL0_Hz > 0.0) {
              
          const double t_ns = 1.0e9 / rateL0_Hz;          // [ns]
              
          for (double t1 = period.getLowerLimit() + gRandom->Exp(t_ns); t1 < period.getUpperLimit(); t1 += gRandom->Exp(t_ns)) {
            output[pmt].push_back(JPMTSignal(t1, 1));
          }
        }
      }


      // generate coincidences

      double totalRateL1_Hz = 0.0;

      for (int i = 0; i != N; ++i) {
        totalRateL1_Hz += rateL1_Hz[i] = getMultiplesRate(module.getID(), i + 2);
      }

      if (totalRateL1_Hz > 0.0) {

        const double t_ns = 1.0e9 / totalRateL1_Hz;       // [ns]

        double t1 = period.getLowerLimit() + gRandom->Exp(t_ns);

        if (t1 < period.getUpperLimit()) {


          // configure correlation matrix

          for (int i = 0; i != N; ++i) {
            
            probability2D[i][i] = 0.0;

            for (int j = i + 1; j != N; ++j) {
              
              const double ct = JMATH::getDot(module[i], module[j]);
              const double p  = getProbability(ct);
              
              probability2D[i][j] = p;
              probability2D[j][i] = p;
            }
          }


          // determine probability of a coincidence as a function of the PMT number
          
          for (int i = 0; i != N; ++i) {

            probability1D[i] = 0.0;

            for (int j = 0; j != N; ++j) {
              probability1D[i] += probability2D[i][j];
            }
          }


          for ( ; t1 < period.getUpperLimit(); t1 += gRandom->Exp(t_ns)) {


            // generate two-fold coincidence

            const unsigned int pmt1 = getRandomIndex(probability1D,       gRandom->Rndm());
            const unsigned int pmt2 = getRandomIndex(probability2D[pmt1], gRandom->Rndm());

            output[pmt1].insert(JPMTSignal(gRandom->Gaus(t1, getSigma()), 1));
            output[pmt2].insert(JPMTSignal(gRandom->Gaus(t1, getSigma()), 1));


            try {

              // generate larger than two-fold coincidences, if any

              unsigned int M = getRandomIndex(rateL1_Hz, gRandom->Rndm());

              if (M != 0) {

                probabilityND = probability2D[pmt1];

                for (unsigned int pmtN = pmt2; M != 0; --M) {

                  for (int i = 0; i != N; ++i) {
                    probabilityND[i] *= probability2D[pmtN][i];
                  }

                  probabilityND[pmtN] = 0.0;
                  
                  pmtN = getRandomIndex(probabilityND, gRandom->Rndm());
                  
                  output[pmtN].insert(JPMTSignal(gRandom->Gaus(t1, getSigma()), 1));
                }
              }
            }
            catch (const JNumericalPrecision&) {}
          }
        }
      }
    }

static unsigned int JDETECTOR::JK40DefaultSimulatorInterface::getRandomIndex ( const JBuffer1D_t &  buffer, const double  random  )

inlinestaticinherited

Get index based on random value.

It is assumed that the values of the input buffer monotonously decrease or increase. This method throws an exception when the summed values in the input buffer is zero.

Parameters

buffer	input values
random	random value <0,1]

Returns

index

Definition at line 244 of file JK40DefaultSimulatorInterface.hh.

    {
      double x = 0.0;

      for (JBuffer1D_t::const_iterator i = buffer.begin(); i != buffer.end(); ++i) {
        x += *i;
      }

      if (x > 0.0) {

        x *= random;

        unsigned int index = 0;

        for (JBuffer1D_t::const_iterator i = buffer.begin(); i != buffer.end() && (x -= *i) > 0.0; ++i, ++index) {}

        if (index == buffer.size()) {
          --index;
        }

        return index;

      } else {

        THROW(JNumericalPrecision, "getRandomIndex(): zero or negative probability.");
      }
    }

static double JDETECTOR::JK40DefaultSimulatorInterface::getSigma ( )

inlinestaticinherited

Get intrinsic time smearing of K40 coincidences.

Returns

sigma [ns]

Definition at line 278 of file JK40DefaultSimulatorInterface.hh.

    {
      return 0.5;
    }

multiplicity_type JPHYSICS::JK40Rates::getLowerL1Multiplicity ( ) const

inlineinherited

Get lower multiplicty.

Returns

lower multiplicity

Definition at line 97 of file JK40Rates.hh.

    {
      return LOWER_L1_MULTIPLICITY;
    }

multiplicity_type JPHYSICS::JK40Rates::getUpperL1Multiplicity ( ) const

inlineinherited

Get upper multiplicty.

Returns

upper multiplicity

Definition at line 108 of file JK40Rates.hh.

    {
      return rateL1.size() + 1;
    }

void JPHYSICS::JK40Rates::correct ( const double  QE )

inlineinherited

Correct rates for global efficiency,.

Parameters

QE	global efficiency

Definition at line 119 of file JK40Rates.hh.

    {
      if (QE > 0.0) {
      
        rateL0 /= QE;

        JRateL1_t buffer = rateL1;
        
        for (multiplicity_type M = getUpperL1Multiplicity(); M >= getLowerL1Multiplicity(); --M) {

          // determine contribution from higher multiplicities
          
          double R = 0.0;
          
          for (multiplicity_type i = M + 1; i <= getUpperL1Multiplicity(); ++i) {
            R += buffer[i - LOWER_L1_MULTIPLICITY] * JMATH::binomial(i, M) * pow(QE, M) * pow(1.0 - QE, i - M);
          }

          if (getMultiplesRate(M) > R)
            buffer[M - LOWER_L1_MULTIPLICITY] = (getMultiplesRate(M) - R) / pow(QE, M);
          else
            buffer[M - LOWER_L1_MULTIPLICITY] =  0.0;
        }

        rateL1 = buffer;
        
      } else {

        rateL0 = 0.0;

        for (JRateL1_t::iterator i = rateL1.begin(); i != rateL1.end(); ++i) {
          *i = 0.0;
        }
      }
    }

Member Data Documentation

const JSummaryRouter& JTRIGGER::JK40RunByRunSimulator::summary_router

protected

Definition at line 70 of file JK40RunByRunSimulator.hh.

const multiplicity_type JPHYSICS::JK40Rates::LOWER_L1_MULTIPLICITY = 2

staticinherited

Lower L1 multiplicity.

Definition at line 206 of file JK40Rates.hh.

JRateL0_t JPHYSICS::JK40Rates::rateL0

protectedinherited

singles rate [Hz]

Definition at line 210 of file JK40Rates.hh.

JRateL1_t JPHYSICS::JK40Rates::rateL1

protectedinherited

multiples rates [Hz]

Definition at line 211 of file JK40Rates.hh.

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

• JK40RunByRunSimulator.hh