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// $Id: PamVMCPrimaryGenerator.cxx,v 1.0 2006/06/03 |
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#include <TVirtualMC.h> |
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#include <TVirtualMCStack.h> |
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#include <TPDGCode.h> |
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#include <TDatabasePDG.h> |
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#include <TParticlePDG.h> |
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#include <TVector3.h> |
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#include <TMath.h> |
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#include <Riostream.h> |
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#include "PamVMCPrimaryGenerator.h" |
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using namespace TMath; |
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ClassImp(PamVMCPrimary) |
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PamVMCPrimary & operator+=(PamVMCPrimary &a, const PamVMCPrimary &b) |
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{ |
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a.fPDG=b.fPDG; |
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a.fX0=b.fX0; |
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a.fY0=b.fY0; |
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a.fZ0=b.fZ0; |
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a.fTHETA=b.fTHETA; |
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a.fPHI=b.fPHI; |
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a.fP0=b.fP0; |
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a.fGOOD=b.fGOOD; |
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return a; |
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} |
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ClassImp(PamVMCPrimaryGenerator) |
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PamVMCPrimaryGenerator::PamVMCPrimaryGenerator(TVirtualMCStack* stack) |
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: TObject(), |
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fStack(stack), |
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fevno(0), |
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fmass(0.), |
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fcharge(0.), |
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frandom(0) |
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{ |
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// Standard constructor |
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ftheta = new TF1("ftheta","sin(x)*cos(x)",0.,acos(-1.)/4.); |
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ftheta->SetNpx(1000); |
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fprimColl = new TClonesArray("PamVMCPrimary"); |
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fprim.fPDG=kProton; |
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fprim.fX0=1.; |
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fprim.fY0=1.; |
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fprim.fZ0=130.; |
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fprim.fTHETA=0.; |
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fprim.fPHI=0.; |
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fprim.fP0=1.; //1GV |
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} |
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PamVMCPrimaryGenerator::PamVMCPrimaryGenerator() |
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: TObject(), |
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fStack(0), |
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fevno(0), |
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fmass(0.), |
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fcharge(0.), |
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fprimColl(0), |
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frandom(0) |
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{ |
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// Default constructor |
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//Default primary proton |
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ftheta = new TF1("ftheta","sin(x)*cos(x)",0.,acos(-1.)/4.); |
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ftheta->SetNpx(1000); |
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fprim.fPDG=kProton; |
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fprim.fX0=1.; |
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fprim.fY0=1.; |
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fprim.fZ0=130.; |
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fprim.fTHETA=0.; |
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fprim.fPHI=0.; |
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fprim.fP0=1.; //1GV |
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} |
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PamVMCPrimaryGenerator::~PamVMCPrimaryGenerator() |
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{ |
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// Destructor |
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delete ftheta; |
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delete fprimColl; |
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} |
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// private methods |
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void PamVMCPrimaryGenerator::GeneratePrimary() |
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{ |
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// Add one primary particle to the user stack (derived from TVirtualMCStack). |
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// Track ID (filled by stack) |
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Int_t ntr; |
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// Option: to be tracked |
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Int_t toBeDone = 1; |
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// Particle type |
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Int_t pdg = fprim.fPDG; |
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Double_t fvx, fvy, fvz; |
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fvx=fprim.fX0; |
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fvy=fprim.fY0; |
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fvz=fprim.fZ0; |
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// Position |
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Double_t tof = 0.; |
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// Energy (in GeV) |
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//printf("generateprimary check fprimP0 = %f\n",fprim.fP0); |
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Double_t kinEnergy = MomentumToKinE(fprim.fP0); |
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Double_t e = fmass + kinEnergy; |
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// Particle momentum |
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Double_t px, py, pz; |
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px = fprim.fP0*Sin(fprim.fTHETA)*Cos(fprim.fPHI); |
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py = fprim.fP0*Sin(fprim.fTHETA)*Sin(fprim.fPHI); |
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pz = -fprim.fP0*Cos(fprim.fTHETA); |
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// Polarization |
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TVector3 polar; |
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// Add particle to stack |
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fStack->PushTrack(toBeDone, -1, pdg, px, py, pz, e, fvx, fvy, fvz, tof, |
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polar.X(), polar.Y(), polar.Z(), |
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kPPrimary, ntr, 1., 0); |
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PamVMCPrimary * pc = (PamVMCPrimary *)fprimColl->New(fevno++); |
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*pc = fprim; |
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} |
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void PamVMCPrimaryGenerator::SetParticle(Int_t pdg){ |
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fprim.fPDG=pdg; |
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//TParticlePDG* particlePDG = TDatabasePDG::Instance()->GetParticle(fprim.fPDG); |
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fmass = (TDatabasePDG::Instance()->GetParticle(fprim.fPDG))->Mass(); |
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fcharge = ((TDatabasePDG::Instance()->GetParticle(fprim.fPDG))->Charge())/3.; |
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} |
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void PamVMCPrimaryGenerator::SetMomentum( |
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Double_t px, Double_t py, Double_t pz) |
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{ |
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fprim.fP0= Sqrt(px*px+py*py+pz*pz); |
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fprim.fTHETA=ATan(Sqrt(px*px+py*py)/pz); |
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fprim.fPHI=ATan(py/px); |
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} |
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void PamVMCPrimaryGenerator::GenSpe(Double_t PEmin, Double_t PEmax, Bool_t isEnergy) |
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{ |
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if(isEnergy) { |
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fprim.fP0=frandom->Uniform(KinEToMomentum(PEmin),KinEToMomentum(PEmax)); |
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} else{ |
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fprim.fP0=frandom->Uniform(PEmin,PEmax); |
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} |
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} |
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void PamVMCPrimaryGenerator::GenSpe(Double_t PEmin, Double_t PEmax, Double_t gamma, Bool_t isEnergy) |
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{ |
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Double_t alpha = 1.+gamma; //integral spectral index |
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if(alpha==0.){ |
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fprim.fP0=Exp(Log(PEmin)+frandom->Uniform(0.,1.)*(Log(PEmax)-Log(PEmin))); |
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} else { |
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if(PEmin==0.) PEmin=1.E-10; |
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fprim.fP0=Power((frandom->Uniform(0.,1.)*(Power(PEmax,alpha)-Power(PEmin,alpha))+Power(PEmin,alpha)),1./alpha); |
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} |
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cout<<"GenSpe fprim.fP0= "<<fprim.fP0<<endl; |
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if(isEnergy) fprim.fP0=KinEToMomentum(fprim.fP0); |
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} |
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//Cecilia Pizzolotto: powerlaw spectrum 3 with the shape |
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// J(E) = 0.5*(E + b * exp(-c * sqrt(E)))^-a |
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// between PEmin and PEmax and with the input parameters a,b,c. |
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// Valeria di Felice fits parameter values are: |
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// protons: a,b,c= 2.70, 2.15, 0.21 |
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// electrons: a,b,c= 0.0638, 1.248e-16, -38.248 |
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void PamVMCPrimaryGenerator::GenSpe_3par(Double_t PEmin, Double_t PEmax, Double_t a, Double_t b, Double_t c) |
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{ |
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Bool_t found=0; |
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Double_t funct_min, funct_max; |
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funct_max = function3par(PEmin,a,b,c); |
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funct_min = function3par(PEmax,a,b,c); |
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// |
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Double_t wurfP; |
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Double_t wurfy ; |
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//printf("in genspe3par^^^^%f ^^%f ^^^^^^^^%f ^^^^^%f^^^^^^^\n",PEmin,PEmax,funct_min,funct_max); |
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//printf("in par^^ %f %f %f \n",a,b,c); |
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while( found==0 ) |
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{ |
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wurfP = frandom->Uniform(PEmin,PEmax); |
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wurfy = frandom->Uniform(funct_min,funct_max); |
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if( wurfy<(function3par(wurfP,a,b,c) )) |
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{ |
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// this is ok! |
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fprim.fP0=wurfP; |
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found=1; |
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} |
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} |
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//printf("exit+++++++++++++++++++ %f %f \n",wurfP,fprim.fP0); |
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} |
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// cecilia pizzolotto |
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void PamVMCPrimaryGenerator::GenSpe_Flat(Double_t PEmin, Double_t PEmax, Double_t gamma, Bool_t isEnergy) |
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{ |
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// Generates a flat spectrum from PEmin to PElim. Then a power law |
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Double_t PElim = 1.; |
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//Double_t alpha = 1.+gamma; //integral spectral index |
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Bool_t okflag=0.; |
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Double_t throw_x =0.; |
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Double_t throw_y =0.; |
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while(okflag==0) |
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{ |
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throw_x=frandom->Uniform(PEmin,PEmax); |
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// cout<<" x "<<throw_x<<endl; |
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if(throw_x<=PElim) |
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{ |
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okflag=1.; |
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} |
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else |
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{ |
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throw_y=frandom->Uniform(0.,1.); |
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if( throw_y<(1*pow(throw_x,gamma))) |
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{ |
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okflag=1.; |
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} |
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} |
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} |
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fprim.fP0=throw_x; |
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//h->Fill(fprimf.P0); |
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okflag=0.; // reset |
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if(isEnergy) fprim.fP0=KinEToMomentum(fprim.fP0); |
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} |
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// Spherical distribution -- Test by Cecilia P july 2009 ---- |
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// flusso isotropo su 2pi |
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void PamVMCPrimaryGenerator::GenSphericalPhiThe() |
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{ |
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// Generate phi theta |
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Double_t theta=0.; |
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Double_t phi=0.; |
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Double_t xcos = sqrt( frandom->Uniform(0.,1.) ); |
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theta = acos(xcos); //RAD |
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phi = frandom->Uniform(0.,2.*Pi()); |
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SetDirection(theta, phi); |
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return; |
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} |
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void PamVMCPrimaryGenerator::GenSphPhiThe(Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, |
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Double_t zmin, Double_t zmax) |
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{ |
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Bool_t trkGood = kFALSE; |
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Double_t theta = 999.; |
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Double_t phi = 0.; |
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Double_t x2,y2,x3,y3; |
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Double_t x0,y0,z0; |
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//static const Double_t rad2deg = 57.2958; |
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// S21 and S31 position/size taken as reference (z on top of det) |
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// constraint: must pass throuth these planes |
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static const Double_t s2_xmax=9.05, s2_ymax=7.55, s2_z=73.439; // z on top of det |
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static const Double_t s3_xmax=9.05, s3_ymax=7.55, s3_z=26.093; // z on top of det |
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//Double_t thetamax=3.14; |
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//thetamax = atan((xmax+s3_xmax)/(zmax-s3_z)); |
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//cout<<" Quanto รจ il theta max? "<<thetamax<<" in deg "<<thetamax*(90./Pi())<<endl; |
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while (trkGood!=kTRUE) |
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{ |
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x0= frandom->Uniform(xmin,xmax); |
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y0= frandom->Uniform(ymin,ymax); |
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z0= frandom->Uniform(zmin,zmax); |
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// Generate phi theta |
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theta=999.; // init |
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while (theta>=0.65) // take only theta smaller than 37deg=0.65rad |
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{ |
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Double_t xcos = sqrt( frandom->Uniform(0.,1.) ); |
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theta = acos(xcos); //RAD |
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} |
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phi = frandom->Uniform(0.,2.*Pi()); |
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// Calculate xy at the constraint |
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Double_t fact2 = (s2_z-z0)/cos(theta); |
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x2 = x0 + fabs(fact2) * sin(theta) * cos(phi); |
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y2 = y0 + fabs(fact2) * sin(theta) * sin(phi); |
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Double_t fact3 = (s3_z-z0)/cos(theta); |
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x3 = x0 + fabs(fact3) * sin(theta) * cos(phi); |
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y3 = y0 + fabs(fact3) * sin(theta) * sin(phi); |
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//cout<<" x/y0= "<<x0<<" "<<y0<<" x/y2= "<<fact2*sin(theta)*cos(phi)<<" "<<x2<<" xy3= "<< |
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// fact3*sin(theta)*cos(phi)<<" "<<x3<<" phi/the "<<phi*(90./Pi())<<" "<<theta*(90./Pi())<<endl; |
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// Test condition on the direction |
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if ( Abs(x2) <= Abs(s2_xmax) && Abs(y2) <= Abs(s2_ymax) && |
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Abs(x3) <= Abs(s3_xmax) && Abs(y3) <= Abs(s3_ymax) ) { |
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trkGood = kTRUE; |
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//cout<<" x/y0= "<<x0<<" "<<y0<<" x/y2= "<<fact2*sin(theta)*cos(phi)<<" "<<x2<<" xy3= "<< |
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// fact3*sin(theta)*cos(phi)<<" "<<x3<<endl; |
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} |
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} |
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// Set direction and position: |
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SetDirection(theta, phi); |
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SetPosition(x0, y0, z0); |
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return; |
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} |
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