#include <BetafuncEvtVtxGenerator.h>

Inheritance diagram for BetafuncEvtVtxGenerator:

Public Member Functions
void	Alpha (double m=0)
	angle between crossing plane and horizontal plane
	BetafuncEvtVtxGenerator (const edm::ParameterSet &p)
double	BetaFunction (double z, double z0)
	beta function
void	betastar (double m=0)
	set beta_star
void	emittance (double m=0)
	emittance (no the normalized)
virtual TMatrixD *	GetInvLorentzBoost ()
virtual HepMC::FourVector *	newVertex ()
	return a new event vertex
void	Phi (double m=0)
	set half crossing angle
void	sigmaZ (double s=1.0)
	set resolution in Z in cm
void	X0 (double m=0)
	set mean in X in cm
void	Y0 (double m=0)
	set mean in Y in cm
void	Z0 (double m=0)
	set mean in Z in cm
virtual	~BetafuncEvtVtxGenerator ()
Private Member Functions
	BetafuncEvtVtxGenerator (const BetafuncEvtVtxGenerator &p)
BetafuncEvtVtxGenerator &	operator= (const BetafuncEvtVtxGenerator &rhs)
Private Attributes
double	alpha_
double	falpha
double	fbetastar
double	femittance
CLHEP::RandGaussQ *	fRandom
double	fSigmaZ
double	fTimeOffset
double	fX0
double	fY0
double	fZ0
double	phi_

Detailed Description

Definition at line 29 of file BetafuncEvtVtxGenerator.h.

Constructor & Destructor Documentation

BetafuncEvtVtxGenerator::BetafuncEvtVtxGenerator ( const edm::ParameterSet & p )

Definition at line 36 of file BetafuncEvtVtxGenerator.cc.

References alpha_, Exception, fbetastar, femittance, fRandom, fSigmaZ, fTimeOffset, fX0, fY0, fZ0, BaseEvtVtxGenerator::getEngine(), edm::ParameterSet::getParameter(), and phi_.

: BaseEvtVtxGenerator(p)
{ 
  
  fRandom = new CLHEP::RandGaussQ(getEngine());

  fX0 =        p.getParameter<double>("X0")*cm;
  fY0 =        p.getParameter<double>("Y0")*cm;
  fZ0 =        p.getParameter<double>("Z0")*cm;
  fSigmaZ =    p.getParameter<double>("SigmaZ")*cm;
  alpha_ =     p.getParameter<double>("Alpha")*radian;
  phi_ =       p.getParameter<double>("Phi")*radian;
  fbetastar =  p.getParameter<double>("BetaStar")*cm;
  femittance = p.getParameter<double>("Emittance")*cm; // this is not the normalized emittance
  fTimeOffset = p.getParameter<double>("TimeOffset")*ns*c_light; // HepMC time units are mm
 
  if (fSigmaZ <= 0) {
          throw cms::Exception("Configuration")
                  << "Error in BetafuncEvtVtxGenerator: "
                  << "Illegal resolution in Z (SigmaZ is negative)";
  }

  
}

BetafuncEvtVtxGenerator::~BetafuncEvtVtxGenerator ( ) [virtual]

Definition at line 61 of file BetafuncEvtVtxGenerator.cc.

References fRandom.

{
    delete fRandom; 
}

BetafuncEvtVtxGenerator::BetafuncEvtVtxGenerator ( const BetafuncEvtVtxGenerator & p ) [private]

Copy constructor

Member Function Documentation

void BetafuncEvtVtxGenerator::Alpha ( double m = 0 ) [inline]

angle between crossing plane and horizontal plane

Definition at line 55 of file BetafuncEvtVtxGenerator.h.

References alpha_, and m.

{ alpha_=m; }

double BetafuncEvtVtxGenerator::BetaFunction	(	double	z,
		double	z0
	)

beta function

Definition at line 95 of file BetafuncEvtVtxGenerator.cc.

References fbetastar, femittance, and mathSSE::sqrt().

Referenced by newVertex().

{
        return sqrt(femittance*(fbetastar+(((z-z0)*(z-z0))/fbetastar)));

}

void BetafuncEvtVtxGenerator::betastar ( double m = 0 ) [inline]

set beta_star

Definition at line 58 of file BetafuncEvtVtxGenerator.h.

References fbetastar, and m.

{ fbetastar=m; }

void BetafuncEvtVtxGenerator::emittance ( double m = 0 ) [inline]

emittance (no the normalized)

Definition at line 60 of file BetafuncEvtVtxGenerator.h.

References femittance, and m.

{ femittance=m; }

TMatrixD * BetafuncEvtVtxGenerator::GetInvLorentzBoost ( ) [virtual]

Implements BaseEvtVtxGenerator.

Definition at line 114 of file BetafuncEvtVtxGenerator.cc.

References alpha_, BaseEvtVtxGenerator::boost_, funct::cos(), phi_, funct::sin(), and funct::tan().

                                                      {

        //alpha_ = 0;
        //phi_ = 142.e-6;
        
        if (boost_ != 0 ) return boost_;
        
        //boost_.ResizeTo(4,4);
        //boost_ = new TMatrixD(4,4);
        TMatrixD tmpboost(4,4);
        
        //if ( (alpha_ == 0) && (phi_==0) ) { boost_->Zero(); return boost_; }
        
        // Lorentz boost to frame where the collision is head-on
        // phi is the half crossing angle in the plane ZS
        // alpha is the angle to the S axis from the X axis in the XY plane
        
        tmpboost(0,0) = 1./cos(phi_);
        tmpboost(0,1) = - cos(alpha_)*sin(phi_);
        tmpboost(0,2) = - tan(phi_)*sin(phi_);
        tmpboost(0,3) = - sin(alpha_)*sin(phi_);
        tmpboost(1,0) = - cos(alpha_)*tan(phi_);
        tmpboost(1,1) = 1.;
        tmpboost(1,2) = cos(alpha_)*tan(phi_);
        tmpboost(1,3) = 0.;
        tmpboost(2,0) = 0.;
        tmpboost(2,1) = - cos(alpha_)*sin(phi_);
        tmpboost(2,2) = cos(phi_);
        tmpboost(2,3) = - sin(alpha_)*sin(phi_);
        tmpboost(3,0) = - sin(alpha_)*tan(phi_);
        tmpboost(3,1) = 0.;
        tmpboost(3,2) = sin(alpha_)*tan(phi_);
        tmpboost(3,3) = 1.;

        tmpboost.Invert();
        boost_ = new TMatrixD(tmpboost);
        //boost_->Print();
        
        return boost_;
}

HepMC::FourVector * BetafuncEvtVtxGenerator::newVertex ( ) [virtual]

return a new event vertex

Implements BaseEvtVtxGenerator.

Definition at line 68 of file BetafuncEvtVtxGenerator.cc.

References BetaFunction(), fRandom, fSigmaZ, fTimeOffset, BaseEvtVtxGenerator::fVertex, fX0, fY0, fZ0, mathSSE::sqrt(), X, and Gflash::Z.

                                                    {

        
        double X,Y,Z;
        
        double tmp_sigz = fRandom->fire(0., fSigmaZ);
        Z = tmp_sigz + fZ0;

        double tmp_sigx = BetaFunction(Z,fZ0); 
        // need sqrt(2) for beamspot width relative to single beam width
        tmp_sigx /= sqrt(2.0);
        X = fRandom->fire(0.,tmp_sigx) + fX0; // + Z*fdxdz ;

        double tmp_sigy = BetaFunction(Z,fZ0);
        // need sqrt(2) for beamspot width relative to single beam width
        tmp_sigy /= sqrt(2.0);
        Y = fRandom->fire(0.,tmp_sigy) + fY0; // + Z*fdydz;

        double tmp_sigt = fRandom->fire(0., fSigmaZ);
        double T = tmp_sigt + fTimeOffset; 

        if ( fVertex == 0 ) fVertex = new HepMC::FourVector();
        fVertex->set(X,Y,Z,T);
                
        return fVertex;
}

BetafuncEvtVtxGenerator& BetafuncEvtVtxGenerator::operator= ( const BetafuncEvtVtxGenerator & rhs ) [private]

Copy assignment operator

void BetafuncEvtVtxGenerator::Phi ( double m = 0 ) [inline]

set half crossing angle

Definition at line 53 of file BetafuncEvtVtxGenerator.h.

References m, and phi_.

{ phi_=m; }

void BetafuncEvtVtxGenerator::sigmaZ ( double s = 1.0 )

set resolution in Z in cm

Definition at line 102 of file BetafuncEvtVtxGenerator.cc.

References Exception, fSigmaZ, and asciidump::s.

{ 
        if (s>=0 ) {
                fSigmaZ=s; 
        }
        else {
                throw cms::Exception("LogicError")
                        << "Error in BetafuncEvtVtxGenerator::sigmaZ: "
                        << "Illegal resolution in Z (negative)";
        }
}