X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=ZDC%2FAliGenZDC.cxx;h=3b1c8d868121ab4854d3a0949c8332092a7934d8;hb=d11858164e84cf582b09ce8c32e336b221f67728;hp=4c5ec37288f640ad3971550846b070f81ec736fc;hpb=f3f777b87466ceb5f65c7a73b42d752c5cd1f8dd;p=u%2Fmrichter%2FAliRoot.git diff --git a/ZDC/AliGenZDC.cxx b/ZDC/AliGenZDC.cxx index 4c5ec37288f..3b1c8d86812 100644 --- a/ZDC/AliGenZDC.cxx +++ b/ZDC/AliGenZDC.cxx @@ -13,105 +13,95 @@ * provided "as is" without express or implied warranty. * **************************************************************************/ -/* -$Log$ -Revision 1.8 2001/04/20 10:10:25 coppedis -Minor changes +/* $Id$ */ -Revision 1.7 2001/03/15 16:13:28 coppedis -Code review +////////////////////////////////////////////////////////////////////// +// // // +// Generator of spectator nucleons (either protons or neutrons)// +// computes beam crossing and divergence and Fermi momentum // +// // +///////////////////////////////////////////////////////////////////// -Revision 1.6 2000/11/30 17:16:14 coppedis -Changes suggested by fca - -Revision 1.5 2000/11/22 11:30:12 coppedis -Major code revision - -Revision 1.4 2000/10/05 08:02:47 fca -Correction of the generator direction - -Revision 1.3 2000/10/02 21:28:20 fca -Removal of useless dependecies via forward declarations - -Revision 1.2 2000/07/11 11:12:34 fca -Some syntax corrections for non standard HP aCC - -Revision 1.1 2000/07/10 13:58:01 fca -New version of ZDC from E.Scomparin & C.Oppedisano - -Revision 1.7 2000/01/19 17:17:40 fca - -Revision 1.6 1999/09/29 09:24:35 fca -Introduction of the Copyright and cvs Log - -*/ #include -#include +#include #include +#include +#include +#include #include -#include "TDatabasePDG.h" -#include "AliGenZDC.h" #include "AliConst.h" -#include "AliPDG.h" +#include "AliGenZDC.h" #include "AliRun.h" -#include "AliMCProcess.h" +#include "AliMC.h" ClassImp(AliGenZDC) //_____________________________________________________________________________ AliGenZDC::AliGenZDC() - :AliGenerator() + :AliGenerator(), + fIpart(0), + fCosx(0), + fCosy(0), + fCosz(0), + fPseudoRapidity(0), + fFermiflag(0), + fBeamDiv(0), + fBeamCrossAngle(0), + fBeamCrossPlane(0), + fDebugOpt(0) { // // Default constructor // - fIpart = 0; + for(Int_t i=0; i<201; i++){ + fProbintp[i]=0.; + fProbintn[i]=0.; + fPp[i]=0.; + } } //_____________________________________________________________________________ AliGenZDC::AliGenZDC(Int_t npart) - :AliGenerator(npart) + :AliGenerator(npart), + fIpart(kNeutron), + fCosx(0.), + fCosy(0.), + fCosz(1.), + fPseudoRapidity(0.), + fFermiflag(1), + fBeamDiv(0.000032), + fBeamCrossAngle(0.0001), + fBeamCrossPlane(2), + fDebugOpt(0) { // // Standard constructor // fName = "AliGenZDC"; fTitle = "Generation of Test Particles for ZDCs"; - fIpart = kNeutron; - fCosx = 0.; - fCosy = 0.; - fCosz = 1.; - fPseudoRapidity = 0.; - - fFermiflag = 1; - // LHC values for beam divergence and crossing angle - fBeamDiv = 0.000032; - fBeamCrossAngle = 0.0001; - fBeamCrossPlane = 2; - Int_t i, j; - for(i=0; i<201; i++){ + for(Int_t i=0; i<201; i++){ fProbintp[i] = 0; fProbintn[i] = 0; - } - for(j=0; j<3; j++){ fPp[i] = 0; } - fDebugOpt = 0; } //_____________________________________________________________________________ void AliGenZDC::Init() { - printf("\n\n AliGenZDC initialized with:\n"); - printf(" Fermi flag = %d, Beam Divergence = %f, Crossing Angle " - "= %f, Crossing Plane = %d\n\n", fFermiflag, fBeamDiv, fBeamCrossAngle, + //Initialize Fermi momentum distributions for Pb-Pb + // + printf("\n\n AliGenZDC initialization:\n"); + printf(" Particle: %d, Track cosines: x = %f, y = %f, z = %f \n", + fIpart,fCosx,fCosy,fCosz); + printf(" Fermi flag = %d, Beam divergence = %f, Crossing angle " + "= %f, Crossing plane = %d\n\n", fFermiflag, fBeamDiv, fBeamCrossAngle, fBeamCrossPlane); - //Initialize Fermi momentum distributions for Pb-Pb - FermiTwoGaussian(207.,82.,fPp,fProbintp,fProbintn); + FermiTwoGaussian(208.); } //_____________________________________________________________________________ @@ -122,7 +112,7 @@ void AliGenZDC::Generate() // Int_t i; - Double_t Mass, pLab[3], fP0, fP[3], fBoostP[3], ddp[3], dddp0, dddp[3]; + Double_t mass, pLab[3], fP0, fP[3], fBoostP[3], ddp[3]={0.,0.,0.}, dddp0, dddp[3]; Float_t fPTrack[3], ptot = fPMin; Int_t nt; @@ -137,36 +127,30 @@ void AliGenZDC::Generate() pLab[1] = 0.; pLab[2] = ptot*TMath::Cos(scang); } - for(i=0; i<=2; i++){ - fP[i] = pLab[i]; + for(i=0; i<=2; i++) fP[i] = pLab[i]; + if(fDebugOpt == 1){ + printf("\n\n Particle momentum before divergence and crossing\n"); + for(i=0; i<=2; i++)printf(" pLab[%d] = %f\n",i,pLab[i]); } - // Beam divergence and crossing angle if(fBeamCrossAngle!=0.) { - BeamDivCross(1,fBeamDiv,fBeamCrossAngle,fBeamCrossPlane,pLab); - for(i=0; i<=2; i++){ - fP[i] = pLab[i]; - } + BeamDivCross(1, pLab); + for(i=0; i<=2; i++) fP[i] = pLab[i]; } if(fBeamDiv!=0.) { - BeamDivCross(0,fBeamDiv,fBeamCrossAngle,fBeamCrossPlane,pLab); - for(i=0; i<=2; i++){ - fP[i] = pLab[i]; - } + BeamDivCross(0, pLab); + for(i=0; i<=2; i++) fP[i] = pLab[i]; } // If required apply the Fermi momentum if(fFermiflag==1){ - if((fIpart==kProton) || (fIpart==kNeutron)){ - ExtractFermi(fIpart,fPp,fProbintp,fProbintn,ddp); - } - Mass=gAlice->PDGDB()->GetParticle(fIpart)->Mass(); - fP0 = TMath::Sqrt(fP[0]*fP[0]+fP[1]*fP[1]+fP[2]*fP[2]+Mass*Mass); - for(i=0; i<=2; i++){ - dddp[i] = ddp[i]; - } - dddp0 = TMath::Sqrt(dddp[0]*dddp[0]+dddp[1]*dddp[1]+dddp[2]*dddp[2]+Mass*Mass); + if((fIpart==kProton) || (fIpart==kNeutron)) + ExtractFermi(fIpart, ddp); + mass=TDatabasePDG::Instance()->GetParticle(fIpart)->Mass(); + fP0 = TMath::Sqrt(fP[0]*fP[0]+fP[1]*fP[1]+fP[2]*fP[2]+mass*mass); + for(i=0; i<=2; i++) dddp[i] = ddp[i]; + dddp0 = TMath::Sqrt(dddp[0]*dddp[0]+dddp[1]*dddp[1]+dddp[2]*dddp[2]+mass*mass); TVector3 b(fP[0]/fP0, fP[1]/fP0, fP[2]/fP0); TLorentzVector pFermi(dddp[0], dddp[1], dddp[2], dddp0); @@ -179,30 +163,36 @@ void AliGenZDC::Generate() } - for(i=0; i<=2; i++){ - fPTrack[i] = fP[i]; - } + for(i=0; i<=2; i++) fPTrack[i] = fP[i]; Float_t polar[3] = {0,0,0}; - gAlice->SetTrack(fTrackIt,-1,fIpart,fPTrack,fOrigin.GetArray(),polar,0, + gAlice->GetMCApp()->PushTrack(fTrackIt,-1,fIpart,fPTrack,fOrigin.GetArray(),polar,0, kPPrimary,nt); + // ----------------------------------------------------------------------- if(fDebugOpt == 1){ printf("\n\n Track momentum:\n"); printf("\n fPTrack = %f, %f, %f \n",fPTrack[0],fPTrack[1],fPTrack[2]); } + else if(fDebugOpt == 2){ + FILE *file; + if((file = fopen("SpectMomentum.dat","a")) == NULL){ + printf("Cannot open file SpectMomentum.dat\n"); + return; + } + fprintf(file," %f \t %f \t %f \n",fPTrack[0],fPTrack[1],fPTrack[2]); + fclose(file); + } + } //_____________________________________________________________________________ -void AliGenZDC::FermiTwoGaussian(Float_t A, Float_t Z, Double_t *fPp, - Double_t *fProbintp, Double_t *fProbintn) +void AliGenZDC::FermiTwoGaussian(Float_t A) { // // Momenta distributions according to the "double-gaussian" // distribution (Ilinov) - equal for protons and neutrons // - fProbintp[0] = 0; - fProbintn[0] = 0; Double_t sig1 = 0.113; Double_t sig2 = 0.250; Double_t alfa = 0.18*(TMath::Power((A/12.),(Float_t)1/3)); @@ -222,39 +212,39 @@ void AliGenZDC::FermiTwoGaussian(Float_t A, Float_t Z, Double_t *fPp, } if(fDebugOpt == 1){ printf("\n\n Initialization of Fermi momenta distribution \n"); - for(Int_t i=0; i<=200; i++){ - printf(" fProbintp[%d] = %f, fProbintn[%d] = %f\n",i,fProbintp[i],i,fProbintn[i]); - } + //for(Int_t i=0; i<=200; i++) + // printf(" fProbintp[%d] = %f, fProbintn[%d] = %f\n",i,fProbintp[i],i,fProbintn[i]); } } //_____________________________________________________________________________ -void AliGenZDC::ExtractFermi(Int_t id, Double_t *fPp, Double_t *fProbintp, - Double_t *fProbintn, Double_t *ddp) +void AliGenZDC::ExtractFermi(Int_t id, Double_t *ddp) { // // Compute Fermi momentum for spectator nucleons // - Int_t i; + Int_t index=0; Float_t xx = gRandom->Rndm(); assert ( id==kProton || id==kNeutron ); if(id==kProton){ - for(i=0; i<=200; i++){ + for(Int_t i=1; i<=200; i++){ if((xx>=fProbintp[i-1]) && (xx=fProbintn[i-1]) && (xxRndm()); - Float_t cost = (1.-2.*(gRandom->Rndm())); - Float_t tet = TMath::ACos(cost); - ddp[0] = pext*TMath::Sin(tet)*TMath::Cos(phi); - ddp[1] = pext*TMath::Sin(tet)*TMath::Sin(phi); - ddp[2] = pext*cost; + index = i; + } + } + Float_t pext = fPp[index]+0.001; + Float_t phi = k2PI*(gRandom->Rndm()); + Float_t cost = (1.-2.*(gRandom->Rndm())); + Float_t tet = TMath::ACos(cost); + ddp[0] = pext*TMath::Sin(tet)*TMath::Cos(phi); + ddp[1] = pext*TMath::Sin(tet)*TMath::Sin(phi); + ddp[2] = pext*cost; if(fDebugOpt == 1){ printf("\n\n Extraction of Fermi momentum\n"); @@ -263,46 +253,41 @@ void AliGenZDC::ExtractFermi(Int_t id, Double_t *fPp, Double_t *fProbintp, } //_____________________________________________________________________________ -void AliGenZDC::BeamDivCross(Int_t icross, Float_t fBeamDiv, Float_t fBeamCrossAngle, - Int_t fBeamCrossPlane, Double_t *pLab) +void AliGenZDC::BeamDivCross(Int_t icross, Double_t *pLab) { + // Applying beam divergence and crossing angle + // Double_t tetpart, fipart, tetdiv=0, fidiv=0, angleSum[2], tetsum, fisum; Double_t rvec; - Int_t i; Double_t pmq = 0.; - for(i=0; i<=2; i++){ - pmq = pmq+pLab[i]*pLab[i]; - } + Int_t i; + for(i=0; i<=2; i++) pmq = pmq+pLab[i]*pLab[i]; Double_t pmod = TMath::Sqrt(pmq); - if(icross==0){ + if(icross==0){ // ##### Beam divergence rvec = gRandom->Gaus(0.0,1.0); tetdiv = fBeamDiv * TMath::Abs(rvec); fidiv = (gRandom->Rndm())*k2PI; } - else if(icross==1){ - if(fBeamCrossPlane==0.){ + else if(icross==1){ // ##### Crossing angle + if(fBeamCrossPlane==0){ tetdiv = 0.; fidiv = 0.; } - else if(fBeamCrossPlane==1.){ + else if(fBeamCrossPlane==1){ // Horizontal crossing plane tetdiv = fBeamCrossAngle; fidiv = 0.; } - else if(fBeamCrossPlane==2.){ + else if(fBeamCrossPlane==2){ // Vertical crossing plane tetdiv = fBeamCrossAngle; - fidiv = 3.*k2PI/4.; + fidiv = k2PI/4.; } } - tetpart = TMath::ATan(TMath::Sqrt(pLab[0]*pLab[0]+pLab[1]*pLab[1])/pLab[2]); - if(pLab[1]!=0. || pLab[0]!=0.){ - fipart = TMath::ATan2(pLab[1],pLab[0]); - } - else{ - fipart = 0.; - } + tetpart = TMath::ATan2(TMath::Sqrt(pLab[0]*pLab[0]+pLab[1]*pLab[1]),pLab[2]); + if(pLab[1]!=0. || pLab[0]!=0.) fipart = TMath::ATan2(pLab[1],pLab[0]); + else fipart = 0.; if(fipart<0.) {fipart = fipart+k2PI;} tetdiv = tetdiv*kRaddeg; fidiv = fidiv*kRaddeg; @@ -317,17 +302,17 @@ void AliGenZDC::BeamDivCross(Int_t icross, Float_t fBeamDiv, Float_t fBeamCrossA pLab[1] = pmod*TMath::Sin(tetsum)*TMath::Sin(fisum); pLab[2] = pmod*TMath::Cos(tetsum); if(fDebugOpt == 1){ - printf("\n\n Beam divergence and crossing angle\n"); - for(i=0; i<=2; i++){ - printf(" pLab[%d] = %f\n",i,pLab[i]); - } + if(icross==0) printf("\n\n Beam divergence \n"); + else printf("\n\n Beam crossing \n"); + for(i=0; i<=2; i++)printf(" pLab[%d] = %f\n",i,pLab[i]); } } //_____________________________________________________________________________ void AliGenZDC::AddAngle(Double_t theta1, Double_t phi1, Double_t theta2, Double_t phi2, Double_t *angleSum) -{ +{ + // Calculating the sum of 2 angles Double_t temp, conv, cx, cy, cz, ct1, st1, ct2, st2, cp1, sp1, cp2, sp2; Double_t rtetsum, tetsum, fisum;