+++ /dev/null
-/**************************************************************************
- * 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. *
- **************************************************************************/
-
-/* $Id$ */
-
-#include <TMath.h>
-#include <TParticle.h>
-#include <TRandom.h>
-#include <TVirtualMC.h>
-
-#include "AliRICHResponseV0.h"
-#include "AliRun.h"
-#include "AliSegmentation.h"
-#include "AliMC.h"
-
-//___________________________________________
-ClassImp(AliRICHResponseV0)
-
-AliRICHResponseV0::AliRICHResponseV0()
-{
- SetSigmaIntegration(5.);
- SetChargeSlope(27.);
- SetChargeSpread(0.18, 0.18);
- SetMaxAdc(4096);
- SetAlphaFeedback(0.036);
- SetEIonisation(26.e-9);
- SetSqrtKx3(0.77459667);
- SetKx2(0.962);
- SetKx4(0.379);
- SetSqrtKy3(0.77459667);
- SetKy2(0.962);
- SetKy4(0.379);
- SetPitch(0.25);
- SetWireSag(1); // 1->On, 0->Off
- SetVoltage(2150); // Should only be 2000, 2050, 2100 or 2150
-}//AliRICHResponseV0::ctor()
-Float_t AliRICHResponseV0::IntPH(Float_t eloss, Float_t yhit)
-{
- // Get number of electrons and return charge
-
- Int_t nel;
- nel= Int_t(eloss/fEIonisation);
-
- Float_t charge=0;
- Double_t gain_var=1;
-
- if (nel == 0) nel=1;
-
- if (fWireSag)
- {
- //printf("Voltage:%d, Yhit:%f\n",fVoltage, yhit);
-
- if (fVoltage==2150)
- {
- gain_var = 9e-6*TMath::Power(yhit,4) + 2e-7*TMath::Power(yhit,3) - 0.0316*TMath::Power(yhit,2) - 3e-4*yhit + 25.367;
- //gain_var = 9e-5*TMath::Power(yhit,4) + 2e-6*TMath::Power(yhit,3) - 0.316*TMath::Power(yhit,2) - 3e-3*yhit + 253.67;
- }
- if (fVoltage==2100)
- gain_var = 8e-6*TMath::Power(yhit,4) + 2e-7*TMath::Power(yhit,3) - 0.0283*TMath::Power(yhit,2) - 2e-4*yhit + 23.015;
- if (fVoltage==2050)
- gain_var = 7e-6*TMath::Power(yhit,4) + 1e-7*TMath::Power(yhit,3) - 0.0254*TMath::Power(yhit,2) - 2e-4*yhit + 20.888;
- if (fVoltage==2000)
- gain_var = 6e-6*TMath::Power(yhit,4) + 8e-8*TMath::Power(yhit,3) - 0.0227*TMath::Power(yhit,2) - 1e-4*yhit + 18.961;
-
- gain_var = gain_var/100;
- //printf("Yhit:%f, Gain variation:%f\n",yhit,gain_var);
-
- Float_t gain = (fChargeSlope + fChargeSlope*gain_var)*.9;
- //printf(" Yhit:%f, Gain variation:%f\n",yhit, gain);
-
- for (Int_t i=1;i<=nel;i++) {
- charge -= gain*TMath::Log(gRandom->Rndm());
- }
- }
- else
- {
- for (Int_t i=1;i<=nel;i++) {
- charge -= fChargeSlope*TMath::Log(gRandom->Rndm());
- }
- }
-
- return charge;
-}
-
-Float_t AliRICHResponseV0::IntPH(Float_t yhit)
-{
-
-// Get number of electrons and return charge, for a single photon
-
- Float_t charge=0;
- Double_t gain_var=1;
-
- if (fWireSag)
- {
- if (fVoltage==2150)
- {
- gain_var = 9e-6*TMath::Power(yhit,4) + 2e-7*TMath::Power(yhit,3) - 0.0316*TMath::Power(yhit,2) - 3e-4*yhit + 25.367;
- //gain_var = 9e-5*TMath::Power(yhit,4) + 2e-6*TMath::Power(yhit,3) - 0.316*TMath::Power(yhit,2) - 3e-3*yhit + 253.67;
- }
- if (fVoltage==2100)
- gain_var = 8e-6*TMath::Power(yhit,4) + 2e-7*TMath::Power(yhit,3) - 0.0283*TMath::Power(yhit,2) - 2e-4*yhit + 23.015;
- if (fVoltage==2050)
- gain_var = 7e-6*TMath::Power(yhit,4) + 1e-7*TMath::Power(yhit,3) - 0.0254*TMath::Power(yhit,2) - 2e-4*yhit + 20.888;
- if (fVoltage==2000)
- gain_var = 6e-6*TMath::Power(yhit,4) + 8e-8*TMath::Power(yhit,3) - 0.0227*TMath::Power(yhit,2) - 1e-4*yhit + 18.961;
-
- gain_var = gain_var/100;
- //printf(" Yhit:%f, Gain variation:%f\n",yhit, gain_var);
-
- Float_t gain = (fChargeSlope + fChargeSlope*gain_var)*.9;
-
- charge -= gain*TMath::Log(gRandom->Rndm());
- //printf(" Yhit:%f, Gain variation:%f\n",yhit, gain);
- }
- else
- {
- charge -= fChargeSlope*TMath::Log(gRandom->Rndm());
- }
- return charge;
-}
-
-
-
-// -------------------------------------------
-Float_t AliRICHResponseV0::IntXY(AliSegmentation * segmentation)
-{
-
- const Float_t kInversePitch = 1/fPitch;
- Float_t response;
-//
-// Integration limits defined by segmentation model
-//
-
- Float_t xi1, xi2, yi1, yi2;
- segmentation->IntegrationLimits(xi1,xi2,yi1,yi2);
-
- xi1=xi1*kInversePitch;
- xi2=xi2*kInversePitch;
- yi1=yi1*kInversePitch;
- yi2=yi2*kInversePitch;
-
- //printf("Integration Limits: %f-%f, %f-%f\n",xi1,xi2,yi1,yi2);
-
- //printf("KInversePitch:%f\n",kInversePitch);
-
- //
-// The Mathieson function
- Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1);
- Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2);
-
- Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1);
- Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2);
-
- //printf("Integration Data: %f-%f, %f-%f\n",ux1,ux2,uy1,uy2);
-
- //printf("%f %f %f %f\n",fSqrtKx3,fKx2,fKy4,fKx4);
-
- response=4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1));
-
- //printf("Response:%f\n",response);
-
- return response;
-
-}
-
-Int_t AliRICHResponseV0::FeedBackPhotons(Float_t *source, Float_t qtot)
-{
- //
- // Generate FeedBack photons
- //
- Int_t j, ipart, nt;
-
- Int_t sNfeed=0;
-
-
- // Local variables
- Double_t ranf[2];
- Float_t cthf, phif, enfp = 0, sthf;
- Int_t i, ifeed;
- Float_t e1[3], e2[3], e3[3];
- Float_t vmod, uswop;
- Float_t fp;
- Double_t random;
- Float_t dir[3], phi;
- Int_t nfp;
- Float_t pol[3], mom[4];
- TLorentzVector position;
- //
- // Determine number of feedback photons
-
- // Get weight of current particle
- TParticle *current = (TParticle*)
- (*gAlice->GetMCApp()->Particles())[gAlice->GetMCApp()->GetCurrentTrackNumber()];
-
- ifeed = Int_t(current->GetWeight()/100+0.5);
- ipart = gMC->TrackPid();
- fp = fAlphaFeedback * qtot;
- nfp = gRandom->Poisson(fp);
-
- // This call to fill the time of flight
- gMC->TrackPosition(position);
- //printf("Track position: %f %f %f %15.12f\n", position[0],position[1],position[2],position[3]);
- //
- // Generate photons
- for (i = 0; i <nfp; i++) {
-
- // Direction
- gMC->GetRandom()->RndmArray(2,ranf);
- cthf = ranf[0] * 2 - 1.;
- if (cthf < 0) continue;
- sthf = TMath::Sqrt((1 - cthf) * (1 + cthf));
- phif = ranf[1] * 2 * TMath::Pi();
- //
- //gMC->Rndm(&random, 1);
- gMC->GetRandom()->RndmArray(1, &random);
- if (random <= .57) {
- enfp = 7.5e-9;
- } else if (random <= .7) {
- enfp = 6.4e-9;
- } else {
- enfp = 7.9e-9;
- }
-
- dir[0] = sthf * TMath::Sin(phif);
- dir[1] = cthf;
- dir[2] = sthf * TMath::Cos(phif);
- gMC->Gdtom(dir, mom, 2);
- mom[0]*=enfp;
- mom[1]*=enfp;
- mom[2]*=enfp;
- mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]);
- //printf("Dir %f %f %f\n",dir[0],dir[1],dir[2]);
- //printf("Momentum %15.12f %15.12f %15.12f\n",mom[0],mom[1],mom[2]);
- //printf("Energy %e\n", mom[3]);
-
- // Polarisation
- e1[0] = 0;
- e1[1] = -dir[2];
- e1[2] = dir[1];
-
- e2[0] = -dir[1];
- e2[1] = dir[0];
- e2[2] = 0;
-
- e3[0] = dir[1];
- e3[1] = 0;
- e3[2] = -dir[0];
-
- vmod=0;
- for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
- if (!vmod) for(j=0;j<3;j++) {
- uswop=e1[j];
- e1[j]=e3[j];
- e3[j]=uswop;
- }
- vmod=0;
- for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
- if (!vmod) for(j=0;j<3;j++) {
- uswop=e2[j];
- e2[j]=e3[j];
- e3[j]=uswop;
- }
-
- vmod=0;
- for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
- vmod=TMath::Sqrt(1/vmod);
- for(j=0;j<3;j++) e1[j]*=vmod;
-
- vmod=0;
- for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
- vmod=TMath::Sqrt(1/vmod);
- for(j=0;j<3;j++) e2[j]*=vmod;
-
- //gMC->Rndm(ranf, 1);
- gMC->GetRandom()->RndmArray(1,ranf);
- phi = ranf[0] * 2 * TMath::Pi();
- for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi);
- gMC->Gdtom(pol, pol, 2);
-
- // Put photon on the stack and label it as feedback (51, 52)
- ++sNfeed;
-
- gAlice->GetMCApp()->PushTrack(Int_t(1), gAlice->GetMCApp()->GetCurrentTrackNumber(), Int_t(50000051),
- mom[0],mom[1],mom[2],mom[3],source[0],source[1],source[2],position[3],pol[0],pol[1],pol[2],
- kPFeedBackPhoton, nt, 1.);
-
- //printf("Adding feedback with tof %f and going to %f %f %f\n",position[3],mom[0],mom[1],mom[2]);
- }
- //if(sNfeed)
- //printf("feedbacks produced:%d\n",sNfeed);
- return(sNfeed);
-}
-
-
-
-
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff