* provided "as is" without express or implied warranty. *
**************************************************************************/
-/*
-$Log$
-Revision 1.6 2002/02/01 15:28:22 morsch
-Fastidious print statements removed.
-
-Revision 1.5 2002/02/01 14:12:28 morsch
-Include new gas pressure estimates (LHC Pproject Note 273)
-
-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.
-
-*/
+/* $Id$ */
// 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 <TPDGCode.h>
#include <TSystem.h>
-#include <stdlib.h>
- ClassImp(AliGenHaloProtvino)
- AliGenHaloProtvino::AliGenHaloProtvino()
- :AliGenerator(-1)
+#include "AliGenHaloProtvino.h"
+#include "AliRun.h"
+
+ClassImp(AliGenHaloProtvino)
+
+AliGenHaloProtvino::AliGenHaloProtvino()
+ :AliGenerator(-1)
{
// Constructor
fSide = 1;
//
SetRunPeriod();
+ SetTimePerEvent();
+ SetAnalog(0);
}
AliGenHaloProtvino::AliGenHaloProtvino(Int_t npart)
fSide = 1;
//
SetRunPeriod();
+ SetTimePerEvent();
+ SetAnalog(0);
}
-AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino)
+AliGenHaloProtvino::AliGenHaloProtvino(const AliGenHaloProtvino & HaloProtvino):
+ AliGenerator(HaloProtvino)
{
-// copy constructor
+// Copy constructor
+ HaloProtvino.Copy(*this);
}
//
// Ring 1
//
- for (i = 0; i < 20; i++)
+ for (i = 0; i < 21; 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]);
//
// Transform into interaction rates
//
- const Float_t crossSection = 0.094e-28; // m^2
- const Float_t pFlux = 1.e11/25.e-9; // 1/s
+ const Float_t kCrossSection = 0.094e-28; // m^2
+ Float_t pFlux[5] = {0.2, 0.2, 0.3, 0.3, 1.0};
for (j = 0; j < 5; j++) {
+ pFlux[j] *= 1.e11/25.e-9;
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
+ fG1[i][j] = fG1[i][j] * kCrossSection * pFlux[j]; // 1/m/s
+ fG2[i][j] = fG2[i][j] * kCrossSection * pFlux[j]; // 1/m/s
}
}
+
-
- Float_t sum;
+ Float_t sum1 = 0.;
+ Float_t sum2 = 0.;
- for (Int_t i = 0; i < 250; i++) {
+ for (Int_t i = 0; i < 300; i++) {
Float_t z = 20.+i*1.;
z*=100;
- Float_t wgt = GassPressureWeight(z);
-// printf("\n %f %f", z, wgt);
- sum+=wgt;
+ Float_t wgt1 = GassPressureWeight(z);
+ Float_t wgt2 = GassPressureWeight(-z);
+// printf("weight: %f %f %f %f %f \n", z, wgt1, wgt2, fZ1[20], fZ2[20]);
+ sum1 += wgt1;
+ sum2 += wgt2;
}
- sum/=250.;
- printf("\n %f \n \n", sum);
+ sum1/=250.;
+ sum2/=250.;
+ printf("\n %f %f \n \n", sum1, sum2);
}
//____________________________________________________________
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;
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
+
while(1) {
+//
+// Load event into array
+//
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);
-*/
+ &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;
-
- amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass();
+ }
+//
+// 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*ekin + 2.*amass*ekin);
+ 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;
+ 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;
+ originP[2] = zPrimary[nprim];
Float_t pP[3] = {0., 0., 0.};
Int_t ntP;
if (fSide == -1) {
- originP[2] = -zPrimary;
+ originP[2] = -zPrimary[nprim];
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);
//
- // Assume particles come from two directions with same probability
+ // 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]*GassPressureWeight(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
+ //
- // 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);
+ fParentWeight=wgt[nprim]*GassPressureWeight(-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);
+ }
}
SetHighWaterMark(nt);
}
+ delete [] zPrimary;
+ delete [] inuc;
+ delete [] ipart;
+ delete [] wgt;
+ delete [] ekin;
+ delete [] vx;
+ delete [] vy;
+ delete [] tx;
+ delete [] ty;
}
AliGenHaloProtvino& AliGenHaloProtvino::operator=(const AliGenHaloProtvino& rhs)
{
// Assignment operator
+ rhs.Copy(*this);
return *this;
}
Float_t weight = 0.;
zPrimary/=100.; // m
Float_t zAbs = TMath::Abs(zPrimary);
- zPrimary = TMath::Abs(zPrimary);
-
- if (zPrimary < 0.)
+ if (zPrimary > 0.)
{
- if (zAbs > fZ1[19]) {
+ if (zAbs > fZ1[20]) {
weight = 2.e4;
} else {
- for (Int_t i = 1; i < 20; i++) {
+ for (Int_t i = 1; i < 21; i++) {
if (zAbs < fZ1[i]) {
weight = fG1[i][fRunPeriod];
break;
}
}
}
-
return weight;
}
+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 <Vadim.Talanov@cern.ch>
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff