/************************************************************************** * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * * * * Author: The ALICE Off-line Project. * * Contributors are mentioned in the code where appropriate. * * * * Permission to use, copy, modify and distribute this software and its * * documentation strictly for non-commercial purposes is hereby granted * * without fee, provided that the above copyright notice appears in all * * copies and that both the copyright notice and this permission notice * * appear in the supporting documentation. The authors make no claims * * about the suitability of this software for any purpose. It is * * provided "as is" without express or implied warranty. * **************************************************************************/ /* $Id$ */ // Read background particles from a boundary source // Very specialized generator to simulate background from beam halo. // The input file is a text file specially prepared // for this purpose. // Author: andreas.morsch@cern.ch #include #include #include #include #include #include #include "AliGenHaloProtvino.h" #include "AliRun.h" ClassImp(AliGenHaloProtvino) AliGenHaloProtvino::AliGenHaloProtvino() :AliGenerator(-1) { // Constructor fName = "HaloProtvino"; fTitle = "Halo from LHC Tunnel"; // // Read all particles fNpart = -1; fFile = 0; fSide = 1; // SetRunPeriod(); SetTimePerEvent(); SetAnalog(0); } AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart) :AliGenerator(npart) { // Constructor fName = "Halo"; fTitle= "Halo from LHC Tunnel"; // fNpart = npart; fFile = 0; fSide = 1; // SetRunPeriod(); SetTimePerEvent(); SetAnalog(0); } AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino): AliGenerator(HaloProtvino) { // Copy constructor HaloProtvino.Copy(*this); } //____________________________________________________________ AliGenHaloProtvino::~AliGenHaloProtvino() { // Destructor } //____________________________________________________________ void AliGenHaloProtvino::Init() { // Initialisation fFile = fopen(fFileName,"r"); if (fFile) { printf("\n File %s opened for reading, %p ! \n ", fFileName.Data(), (void*)fFile); } else { printf("\n Opening of file %s failed, %p ! \n ", fFileName.Data(), (void*)fFile); } // // // // Read file with gas pressure values char *name = 0; if (fRunPeriod < 5) { name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/gasPressure.dat" ); fGPASize = 21; fG1 = new Float_t[fGPASize]; fG2 = new Float_t[fGPASize]; fZ1 = new Float_t[fGPASize]; fZ2 = new Float_t[fGPASize]; } else if (fRunPeriod == 5) { name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/pressure_2003_startup.dat"); fGPASize = 18853; fG1 = new Float_t[fGPASize]; fZ1 = new Float_t[fGPASize]; } else if (fRunPeriod ==6) { name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/pressure_2003_conditioned.dat"); fGPASize = 12719; fG1 = new Float_t[fGPASize]; fZ1 = new Float_t[fGPASize]; } else { Fatal("Init()", "No gas pressure file for given run period !"); } FILE* file = fopen(name, "r"); Float_t z; Int_t i; Float_t p[5]; const Float_t kCrossSection = 0.094e-28; // m^2 const Float_t kFlux = 1.e11 / 25.e-9; // protons/s Float_t pFlux[5] = {0.2, 0.2, 0.3, 0.3, 1.0}; if (fRunPeriod < 5) { // // Ring 1 // for (i = 0; i < fGPASize; i++) { fscanf(file, "%f %f %f %f %f %f", &z, &p[0], &p[1], &p[2] , &p[3], &p[4]); fG1[i] = p[fRunPeriod]; if (i > 0) { fZ1[i] = fZ1[i-1] + z; } else { fZ1[i] = 20.; } } // // Ring 2 // for (i = 0; i < fGPASize; i++) { fscanf(file, "%f %f %f %f %f %f", &z, &p[0], &p[1], &p[2] , &p[3], &p[4]); fG2[i] = p[fRunPeriod]; if (i > 0) { fZ2[i] = fZ2[i-1] + z; } else { fZ2[i] = 20.; } } // // Interaction rates // for (i = 0; i < fGPASize; i++) { fG1[i] = fG1[i] * kCrossSection * pFlux[fRunPeriod] * kFlux; // 1/m/s fG2[i] = fG2[i] * kCrossSection * pFlux[fRunPeriod] * kFlux; // 1/m/s } } else { for (i = 0; i < fGPASize; i++) { fscanf(file, "%f %e %e %e %e %e", &z, &p[0], &p[1], &p[2], &p[3], &p[4]); z /= 1000.; fG1[i] = p[4] * kCrossSection * kFlux; // 1/m/s // 1/3 of nominal intensity at startup if (fRunPeriod == kLHCPR674Startup) fG1[i] /= 3.; fZ1[i] = z; } } // // Transform into interaction rates // Float_t sum1 = 0.; Float_t sum2 = 0.; for (Int_t i = 0; i < 300; i++) { Float_t z = 20.+i*1.; z*=100; Float_t wgt1 = GasPressureWeight(z); Float_t wgt2 = GasPressureWeight(-z); // printf("weight: %f %f %f %f %f \n", z, wgt1, wgt2, fZ1[20], fZ2[20]); sum1 += wgt1; sum2 += wgt2; } sum1/=250.; sum2/=250.; printf("\n %f %f \n \n", sum1, sum2); } //____________________________________________________________ void AliGenHaloProtvino::Generate() { // Generate from input file Float_t polar[3]= {0,0,0}; Float_t origin[3]; Float_t p[3], p0; Float_t tz, txy; Float_t amass; // Int_t ncols, nt; static Int_t nskip = 0; Int_t nread = 0; Float_t* zPrimary = new Float_t [fNpart]; Int_t * inuc = new Int_t [fNpart]; Int_t * ipart = new Int_t [fNpart]; Float_t* wgt = new Float_t [fNpart]; Float_t* ekin = new Float_t [fNpart]; Float_t* vx = new Float_t [fNpart]; Float_t* vy = new Float_t [fNpart]; Float_t* tx = new Float_t [fNpart]; Float_t* ty = new Float_t [fNpart]; Float_t zVertexOld = -1.e10; Int_t nInt = 0; // Counts number of interactions Float_t wwgt = 0.; while(1) { // // Load event into array // ncols = fscanf(fFile,"%f %d %d %f %f %f %f %f %f", &zPrimary[nread], &inuc[nread], &ipart[nread], &wgt[nread], &ekin[nread], &vx[nread], &vy[nread], &tx[nread], &ty[nread]); if (ncols < 0) break; // Skip fNskip events nskip++; if (fNpart !=-1 && nskip <= fNskip) continue; // Count interactions if (zPrimary[nread] != zVertexOld) { nInt++; zVertexOld = zPrimary[nread]; } // Count tracks nread++; if (fNpart !=-1 && nread > fNpart) break; } // // Mean time between interactions // Float_t dT = fTimePerEvent/nInt; // sec Float_t t = 0; // sec // // Loop over primaries // zVertexOld = -1.e10; Double_t arg = 0.; for (Int_t nprim = 0; nprim < fNpart; nprim++) { amass = TDatabasePDG::Instance()->GetParticle(ipart[nprim])->Mass(); // // Momentum vector // p0=sqrt(ekin[nprim]*ekin[nprim] + 2.*amass*ekin[nprim]); txy=TMath::Sqrt(tx[nprim]*tx[nprim]+ty[nprim]*ty[nprim]); if (txy == 1.) { tz=0; } else { tz=-TMath::Sqrt(1.-txy); } p[0] = p0*tx[nprim]; p[1] = p0*ty[nprim]; p[2] =-p0*tz; origin[0] = vx[nprim]; origin[1] = vy[nprim]; origin[2] = -2196.5; // // // Particle weight Float_t originP[3] = {0., 0., 0.}; originP[2] = zPrimary[nprim]; Float_t pP[3] = {0., 0., 0.}; Int_t ntP; if (fSide == -1) { originP[2] = -zPrimary[nprim]; origin[2] = -origin[2]; p[2] = -p[2]; } // // Time // if (zPrimary[nprim] != zVertexOld) { while(arg==0.) arg = gRandom->Rndm(); t -= dT*TMath::Log(arg); // (sec) zVertexOld = zPrimary[nprim]; } // Get statistical weight according to local gas-pressure // fParentWeight=wgt[nprim]*GasPressureWeight(zPrimary[nprim]); if (!fAnalog || gRandom->Rndm() < fParentWeight) { // Pass parent particle // PushTrack(0,-1,kProton,pP,originP,polar,t,kPNoProcess,ntP, fParentWeight); KeepTrack(ntP); PushTrack(fTrackIt,ntP,ipart[nprim],p,origin,polar,t,kPNoProcess,nt,fParentWeight); } // // Both sides are considered // if (fSide > 1) { fParentWeight=wgt[nprim]*GasPressureWeight(-zPrimary[nprim]); if (!fAnalog || gRandom->Rndm() < fParentWeight) { origin[2] = -origin[2]; originP[2] = -originP[2]; p[2]=-p[2]; PushTrack(0,-1,kProton,pP,originP,polar,t,kPNoProcess,ntP, fParentWeight); KeepTrack(ntP); PushTrack(fTrackIt,ntP,ipart[nprim],p,origin,polar,t,kPNoProcess,nt,fParentWeight); } } wwgt += fParentWeight; SetHighWaterMark(nt); } delete [] zPrimary; delete [] inuc; delete [] ipart; delete [] wgt; delete [] ekin; delete [] vx; delete [] vy; delete [] tx; delete [] ty; printf("Total weight %f\n\n", wwgt); } AliGenHaloProtvino& AliGenHaloProtvino::operator=(const AliGenHaloProtvino& rhs) { // Assignment operator rhs.Copy(*this); return *this; } Float_t AliGenHaloProtvino::GasPressureWeight(Float_t zPrimary) { // // Return z-dependent gasspressure weight = interaction rate [1/m/s]. // Float_t weight = 0.; zPrimary /= 100.; // m if (fRunPeriod < 5) { Float_t zAbs = TMath::Abs(zPrimary); if (zPrimary > 0.) { if (zAbs > fZ1[20]) { weight = 2.e4; } else { for (Int_t i = 1; i < 21; i++) { if (zAbs < fZ1[i]) { weight = fG1[i]; break; } } } } else { if (zAbs > fZ2[20]) { weight = 2.e4; } else { for (Int_t i = 1; i < 21; i++) { if (zAbs < fZ2[i]) { weight = fG2[i]; break; } } } } } else { Int_t index = TMath::BinarySearch(fGPASize, fZ1, zPrimary); weight = fG1[index]; } return weight; } void AliGenHaloProtvino::Draw(Option_t *) { // Draws the gas pressure distribution Float_t z[400]; Float_t p[400]; for (Int_t i = 0; i < 400; i++) { z[i] = -20000. + Float_t(i) * 100; p[i] = GasPressureWeight(z[i]); } TGraph* gr = new TGraph(400, z, p); TCanvas* c1 = new TCanvas("c1","Canvas 1",400,10,600,700); c1->cd(); gr->Draw("AL"); } void AliGenHaloProtvino::Copy(TObject&) const { // // Copy // Fatal("Copy","Not implemented!\n"); } /* # Title: README file for the sources of IR8 machine induced background # Author: Vadim Talanov # Modified: 12-12-2000 0. Overview There are three files, named ring.one.beta.[01,10,50].m, which contain the lists of background particles, induced by proton losses upstream of IP8 in the LHC ring one, for the beta* values of 1, 10 and 50 m, respectively. 1. File contents Each line in the files contains the coordinates of particle track crossing with the infinite plane, positioned at z=-1m, together with the physical properties of corresponding particle, namely: S - S coordinate of the primary interaction vertex, cm; N - type of the gas nuclei at interaction, 1 is H, 2 - C and 3 - O; I - particle ID in PDG particle numbering scheme; W - particle weight; E - particle kinetic energy, GeV; X - x coordinate of the crossing point, cm; Y - y coordinate of the crossing point, cm; Dx - x direction cosine; Dy - y direction cosine. 2. Normalisation Each file is given per unity of linear density of proton inelastic interactions with the gas nuclei, [1 inelastic interaction/m]. # ~/vtalanov/public/README.mib: the end. */