/************************************************************************** * 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. * **************************************************************************/ /* $Log$ Revision 1.4 2001/12/19 16:30:24 morsch Some bugs corrected and skip method added. (Rachid Guernane) Revision 1.3 2001/07/27 17:09:36 morsch Use local SetTrack, KeepTrack and SetHighWaterMark methods to delegate either to local stack or to stack owned by AliRun. (Piotr Skowronski, A.M.) Revision 1.2 2001/06/14 12:15:27 morsch Bugs corrected. SetSide() method added. Revision 1.1 2001/01/23 15:04:33 morsch Generator to read beam halo file from Protvino group. */ // 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 "AliGenHaloProtvino.h" #include "AliRun.h" #include "AliMC.h" #include "AliPDG.h" #include #include #include ClassImp(AliGenHaloProtvino) AliGenHaloProtvino::AliGenHaloProtvino() :AliGenerator(-1) { // Constructor printf("\n Calling Default Constructor"); fName = "HaloProtvino"; fTitle = "Halo from LHC Tunnel"; // // Read all particles fNpart = -1; fFile = 0; fSide = 1; // SetRunPeriod(); } AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart) :AliGenerator(npart) { // Constructor printf("\n Calling Constructor"); fName = "Halo"; fTitle= "Halo from LHC Tunnel"; // fNpart = npart; fFile = 0; fSide = 1; // SetRunPeriod(); } AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino) { // copy constructor } //____________________________________________________________ AliGenHaloProtvino::~AliGenHaloProtvino() { // Destructor } //____________________________________________________________ void AliGenHaloProtvino::Init() { // Initialisation fFile = fopen(fFileName,"r"); if (fFile) { printf("\n File %s opened for reading, %p ! \n ", fFileName.Data(), fFile); } else { printf("\n Opening of file %s failed, %p ! \n ", fFileName.Data(), fFile); } // // // // Read file with gas pressure values char *name; name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/gasPressure.dat" ); FILE* file = fopen(name, "r"); Float_t z; Int_t i, j; // // Ring 1 // for (i = 0; i < 20; i++) { fscanf(file, "%f %f %f %f %f %f", &z, &fG1[i][0], &fG1[i][1], &fG1[i][2], &fG1[i][3], &fG1[i][4]); if (i > 0) { fZ1[i] = fZ1[i-1] + z; } else { fZ1[i] = 20.; } } // // Ring 2 // for (i = 0; i < 21; i++) { fscanf(file, "%f %f %f %f %f %f", &z, &fG2[i][0], &fG2[i][1], &fG2[i][2], &fG2[i][3], &fG2[i][4]); if (i > 0) { fZ2[i] = fZ2[i-1] + z; } else { fZ2[i] = 20.; } } // // Transform into interaction rates // const Float_t crossSection = 0.094e-28; // m^2 const Float_t pFlux = 1.e11/25.e-9; // 1/s for (j = 0; j < 5; j++) { for (i = 0; i < 21; i++) { if (i <20) fG1[i][j] = fG1[i][j] * crossSection * pFlux; // 1/m/s fG2[i][j] = fG2[i][j] * crossSection * pFlux; // 1/m/s } } Float_t sum; for (Int_t i = 0; i < 250; i++) { Float_t z = 20.+i*1.; z*=100; Float_t wgt = GassPressureWeight(z); printf("\n %f %f", z, wgt); sum+=wgt; } sum/=250.; printf("\n %f \n \n", sum); } //____________________________________________________________ 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 ekin, wgt, tx, ty, tz, txy; Float_t zPrimary; Float_t amass; Int_t inuc; // Int_t ipart, ncols, nt; Int_t nskip = 0; Int_t nread = 0; while(1) { ncols = fscanf(fFile,"%f %d %d %f %f %f %f %f %f", &zPrimary, &inuc, &ipart, &wgt, &ekin, &origin[0], &origin[1], &tx, &ty); /* printf(" \n %f %d %d %f %f %f %f %f %f", zPrimary, inuc, ipart, wgt, ekin, origin[0], origin[1], tx, ty); */ if (ncols < 0) break; nskip++; if (fNpart !=-1 && nskip <= fNskip) continue; nread++; if (fNpart !=-1 && nread > fNpart) break; amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass(); // // Momentum vector // p0=sqrt(ekin*ekin + 2.*amass*ekin); txy=TMath::Sqrt(tx*tx+ty*ty); if (txy == 1.) { tz=0; } else { tz=-TMath::Sqrt(1.-txy); } p[0]=p0*tx; p[1]=p0*ty; p[2]=-p0*tz; origin[2] = -2196.5; // // // Particle weight Float_t originP[3] = {0., 0., 0.}; originP[2] = zPrimary; Float_t pP[3] = {0., 0., 0.}; Int_t ntP; if (fSide == -1) { originP[2] = -zPrimary; origin[2] = -origin[2]; p[2] = -p[2]; } SetTrack(0,-1,kProton,pP,originP,polar,0,kPNoProcess,ntP); KeepTrack(ntP); fParentWeight=wgt*GassPressureWeight(zPrimary); SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight); SetHighWaterMark(nt); // // Assume particles come from two directions with same probability // Both Side are considered if (fSide > 1) { origin[2]=-origin[2]; p[2]=-p[2]; fParentWeight=wgt*GassPressureWeight(-zPrimary); SetTrack(fTrackIt,ntP,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight); } } } AliGenHaloProtvino& AliGenHaloProtvino::operator=(const AliGenHaloProtvino& rhs) { // Assignment operator return *this; } Float_t AliGenHaloProtvino::GassPressureWeight(Float_t zPrimary) { // // Return z-dependent gasspressure weight = interaction rate [1/m/s]. // Float_t weight = 0.; zPrimary/=100.; // m Float_t zAbs = TMath::Abs(zPrimary); zPrimary = TMath::Abs(zPrimary); if (zPrimary < 0.) { if (zAbs > fZ1[19]) { weight = 2.e4; } else { for (Int_t i = 1; i < 20; i++) { if (zAbs < fZ1[i]) { weight = fG1[i][fRunPeriod]; 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][fRunPeriod]; break; } } } } return weight; } /* # 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. */