* provided "as is" without express or implied warranty. *
**************************************************************************/
-/*
-$Log$
-*/
+/* $Id$ */
// Read background particles from a boundary source
// Very specialized generator to simulate background from beam halo.
// for this purpose.
// Author: andreas.morsch@cern.ch
-#include "AliGenHaloProtvino.h"
-#include "AliRun.h"
-#include "AliMC.h"
-#include "AliPDG.h"
+#include <stdlib.h>
#include <TDatabasePDG.h>
-#include <stdlib.h>
+#include <TCanvas.h>
+#include <TGraph.h>
+#include <TPDGCode.h>
+#include <TSystem.h>
- ClassImp(AliGenHaloProtvino)
- AliGenHaloProtvino::AliGenHaloProtvino()
- :AliGenerator(-1)
+#include "AliLog.h"
+#include "AliGenHaloProtvino.h"
+#include "AliRun.h"
+
+ClassImp(AliGenHaloProtvino)
+
+AliGenHaloProtvino::AliGenHaloProtvino()
+ :AliGenerator(-1),
+ fFile(0),
+ fFileName(0),
+ fSide(1),
+ fRunPeriod(kY3D90),
+ fTimePerEvent(1.e-4),
+ fNskip(0),
+ fZ1(0),
+ fZ2(0),
+ fG1(0),
+ fG2(0),
+ fGPASize(0)
{
// Constructor
- fName="HaloProtvino";
- fTitle="Halo from LHC Tunnel";
+
+ fName = "HaloProtvino";
+ fTitle = "Halo from LHC Tunnel";
//
// Read all particles
- fNpart=-1;
- fp=0;
+ fNpart = -1;
+ SetAnalog(0);
}
AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart)
- :AliGenerator(npart)
+ :AliGenerator(npart),
+ fFile(0),
+ fFileName(0),
+ fSide(1),
+ fRunPeriod(kY3D90),
+ fTimePerEvent(1.e-4),
+ fNskip(0),
+ fZ1(0),
+ fZ2(0),
+ fG1(0),
+ fG2(0),
+ fGPASize(0)
{
// Constructor
- fName="Halo";
- fTitle="Halo from LHC Tunnel";
+ fName = "Halo";
+ fTitle= "Halo from LHC Tunnel";
//
-// Read all particles
- fNpart=-1;
- fp=0;
-}
-
-AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino)
-{
-// copy constructor
+ fNpart = npart;
+//
+ SetAnalog(0);
}
-
//____________________________________________________________
AliGenHaloProtvino::~AliGenHaloProtvino()
{
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 = 0;
+ if (name) file = fopen(name, "r");
+ if (!file) {
+ AliError("No gas pressure file");
+ return;
+ }
+
+ 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};
+
+ Int_t ncols = 0;
+ if (fRunPeriod < 5) {
+//
+// Ring 1
+//
+
+ for (i = 0; i < fGPASize; i++)
+ {
+ ncols = fscanf(file, "%f %f %f %f %f %f", &z, &p[0], &p[1], &p[2] , &p[3], &p[4]);
+ if (ncols<0) break;
+
+ 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++)
+ {
+ ncols = fscanf(file, "%f %f %f %f %f %f", &z, &p[0], &p[1], &p[2] , &p[3], &p[4]);
+ if (ncols<0) break;
+
+ 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++)
+ {
+ ncols = fscanf(file, "%f %e %e %e %e %e", &z, &p[0], &p[1], &p[2], &p[3], &p[4]);
+ if (ncols<0) break;
+
+ 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 iz = 0; iz < 300; iz++) {
+ Float_t zpos = 20. + iz * 1.;
+ zpos *= 100;
+ Float_t wgt1 = GasPressureWeight( zpos);
+ Float_t wgt2 = GasPressureWeight(-zpos);
+ sum1 += wgt1;
+ sum2 += wgt2;
+ }
+ sum1/=250.;
+ sum2/=250.;
+ printf("\n %f %f \n \n", sum1, sum2);
+ delete file;
}
//____________________________________________________________
void AliGenHaloProtvino::Generate()
{
// Generate from input file
- FILE *fp = fopen(fFileName,"r");
- if (fp) {
- printf("\n File %s opened for reading ! \n ", (char*) &fFileName);
- } else {
- printf("\n Opening of file %s failed ! \n ", (char*) &fFileName);
- }
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 tz, txy;
Float_t amass;
- Int_t inuc;
//
- Int_t ipart, ncols, nt;
+ 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];
- Int_t nread=0;
- origin[2]=2650;
+ Float_t zVertexOld = -1.e10;
+ Int_t nInt = 0; // Counts number of interactions
+ Float_t wwgt = 0.;
while(1) {
-
- ncols = fscanf(fp,"%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);
-
+//
+// 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;
-
-
+ if (fNpart !=-1 && nread >= fNpart) break;
+ }
+//
+// Mean time between interactions
+//
- amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass();
+ Float_t dT = 0.; // sec
+ if (nInt > 0)
+ dT = fTimePerEvent/nInt;
+ 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*ekin + 2.*amass);
+ p0=sqrt(ekin[nprim]*ekin[nprim] + 2.*amass*ekin[nprim]);
- txy=TMath::Sqrt(tx*tx+ty*ty);
+ 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;
- p[1]=p0*ty;
- p[2]=p0*tz;
- //
- // Origin: backtracking to tunnel entrance
- //
- Float_t zTunnelEntrance = -20.;
- origin[2] = zTunnelEntrance;
- Float_t dzBack = -1-zTunnelEntrance;
- Float_t dsBack = -dzBack/tz;
+ p[0] = p0*tx[nprim];
+ p[1] = p0*ty[nprim];
+ p[2] =-p0*tz;
- origin[0]+=tx*dsBack;
- origin[1]+=ty*dsBack;
+ 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]);
- fParentWeight=wgt*GassPressureWeight(zPrimary);
- gAlice->SetTrack(fTrackIt,-1,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight);
+ 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
//
- // Assume particles come from two directions with same probability
- origin[2]=-origin[2];
- p[2]=-p[2];
- fParentWeight=wgt*GassPressureWeight(-zPrimary);
- gAlice->SetTrack(fTrackIt,-1,ipart,p,origin,polar,0,kPNoProcess,nt,fParentWeight);
- origin[2]=-origin[2];
- p[2]=-p[2];
+
+ 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)
+Float_t AliGenHaloProtvino::GasPressureWeight(Float_t zPrimary)
{
-// Assignment operator
- return *this;
+//
+// 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;
}
-
-Float_t AliGenHaloProtvino::GassPressureWeight(Float_t zPrimary)
+void AliGenHaloProtvino::Draw(Option_t *)
{
- // Return z-dependent gasspressure weight
- //
- return 1.;
+// 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");
}
+
/*
# Title: README file for the sources of IR8 machine induced background
# Author: Vadim Talanov <Vadim.Talanov@cern.ch>
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff