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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 "PamVMCPrimaryGenerator.h" |
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using TMath::Sqrt; |
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using TMath::Sin; |
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using TMath::Cos; |
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using TMath::ACos; |
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using TMath::Tan; |
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using TMath::ATan; |
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using TMath::ATan2; |
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using TMath::Log; |
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using TMath::Power; |
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using TMath::Exp; |
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using TMath::Pi; |
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using TMath::Abs; |
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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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frnd(0) |
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{ |
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// Standard constructor |
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fprimColl = new TClonesArray("PamVMCPrimary"); |
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frnd = new TRandom3(0); |
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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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frnd(0) |
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{ |
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frnd = new TRandom3(0); |
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// Default constructor |
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//Default primary proton |
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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 frnd; |
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delete fprimColl; |
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} |
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// private methods |
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#include <Riostream.h> |
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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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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((Pi()/180.)*(fprim.fTHETA))*Cos((Pi()/180.)*(fprim.fPHI)); |
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py = -fprim.fP0*Sin((Pi()/180.)*(fprim.fTHETA))*Sin((Pi()/180.)*(fprim.fPHI)); |
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pz = -fprim.fP0*Cos((Pi()/180.)*(fprim.fTHETA)); // converting in radian |
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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=frnd->Uniform(KinEToMomentum(PEmin),KinEToMomentum(PEmax)); |
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} else{ |
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fprim.fP0=frnd->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)+frnd->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((frnd->Uniform(0.,1.)*(Power(PEmax,alpha)-Power(PEmin,alpha))+Power(PEmin,alpha)),1./alpha); |
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} |
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if(isEnergy) fprim.fP0=KinEToMomentum(fprim.fP0); |
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} |
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void PamVMCPrimaryGenerator::GenSphDist(Double_t r, Double_t Thmin, Double_t Thmax, Double_t Phmin, Double_t Phmax) |
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{ |
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Double_t theta, phi, y, f; |
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phi = (Pi()/180.)*frnd->Uniform(Phmin,Phmax); |
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do |
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{ y = frnd->Uniform(0.,1.); |
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theta = (Pi()/180.)*frnd->Uniform(Thmin,Thmax); |
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f = Sin(theta); |
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} while (y>f); |
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//theta = phi = (Pi()/180.)*45.; |
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SetPosition((r*Sin(theta)*Cos(phi)), (r*Sin(theta)*Sin(phi)), (r*Cos(theta))); |
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//random distribution of theta phi in the angle at the vertex at (0,0,r) |
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//by the S3 max distant corners. |
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static const Double_t s3_x=9.0, s3_y=7.5, s3_pz=25.3159; |
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Double_t ang = ATan((Sqrt(s3_x*s3_x+s3_y*s3_y))/(r-s3_pz)); |
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//SetDirection((frnd->Uniform((theta-ang),(theta+ang)))/(Pi()/180.), (frnd->Uniform((phi-ang),(phi+ang)))/(Pi()/180.)); |
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SetDirection((frnd->Uniform((theta-ang),(theta+ang)))/(Pi()/180.), (frnd->Uniform(0.,2*Pi()))/(Pi()/180.)); |
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//SetDirection(0., 0.); |
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} |
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void PamVMCPrimaryGenerator::GenSphDist(Double_t r) |
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{ |
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//cout << "+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+" << endl; |
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static const Double_t s1_x=20.4, s1_y=16.5, s1_pz=102.8866; |
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static const Double_t s2_x=9.0, s2_y=7.5, s2_pz=73.489; |
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static const Double_t s3_x=9.0, s3_y=7.5, s3_pz=25.3159; |
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//calculate max theta and phi angles to be allowed (calculating wrt one |
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//corner of s3 to opposite corner of s1) |
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Double_t rx = s1_x+s3_x; |
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Double_t ry = s1_y+s3_y; |
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Double_t rz = s1_pz-s3_pz; |
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Double_t thmax = (180./Pi())*(ACos(rz/Sqrt(rx*rx+ry*ry+rz*rz))); |
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//Double_t phmax = (180./Pi())*(ATan2(ry,rx)); |
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//cout << "~~~~~~Theta max Phi max : " << thmax <<", "<< phmax << endl; |
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//generate a track check and let it go only if it is passing through all |
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//the 3 TOF |
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Bool_t trkGood = kFALSE; |
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do |
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{ |
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//cout << "+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+" << endl; |
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GenSphDist(r, 0., thmax, 0., 360.); |
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Double_t th = (Pi()/180.)*fprim.fTHETA; |
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Double_t ph = (Pi()/180.)*fprim.fPHI; |
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//cout << "~~~~~~Theta Phi : " << fprim.fTHETA <<", "<< fprim.fPHI << endl; |
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Double_t x1, y1, x2, y2, x3, y3; |
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x1 = s1_pz*Tan(th)*Cos(ph) - fprim.fX0; |
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y1 = s1_pz*Tan(th)*Sin(ph) - fprim.fY0; |
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x2 = s2_pz*Tan(th)*Cos(ph) - fprim.fX0; |
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y2 = s2_pz*Tan(th)*Sin(ph) - fprim.fY0; |
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x3 = s3_pz*Tan(th)*Cos(ph) - fprim.fX0; |
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y3 = s3_pz*Tan(th)*Sin(ph) - fprim.fY0; |
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if ( Abs(x1) <= Abs(s1_x) && Abs(y1) <= Abs(s1_y) && |
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Abs(x2) <= Abs(s2_x) && Abs(y2) <= Abs(s2_y) && |
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Abs(x3) <= Abs(s3_x) && Abs(y3) <= Abs(s3_y) ) trkGood = kTRUE; |
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//cout << "+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+" << endl; |
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}while (!trkGood); |
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//cout << "+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+" << endl; |
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} |
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