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createBSatBDependenceTable.cpp
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//==============================================================================
// createBSatBDependenceTable.cpp
//
// Copyright (C) 2010-2019 Tobias Toll and Thomas Ullrich
//
// This file is part of Sartre.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation.
// This program is distributed in the hope that it will be useful,
// but without any warranty; without even the implied warranty of
// merchantability or fitness for a particular purpose. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Author: Thomas Ullrich
// Last update:
// $Date: 2019-05-31 17:40:34 +0100 (Fri, 31 May 2019) $
// $Author: ullrich $
//==============================================================================
//
// Main program to create impact parameter lookup table.
// [Developer only]
//==============================================================================
#include <iostream>
#include <cmath>
#include <sstream>
#include <cstdlib>
#include <vector>
#include "TableGeneratorNucleus.h"
#include "TableGeneratorSettings.h"
#include "TFile.h"
#include "TH2F.h"
#include "TVector3.h"
#include "Constants.h"
#include "DipoleModelParameters.h"
#define PR(x) cout << #x << " = " << (x) << endl;
using namespace std;
double overlapFunctionT(double);
void createLookUpTableOnFile(unsigned int, unsigned int);
DipoleModelParameters *gParameters;
int main(int argc, const char* argv[])
{
if (argc != 3) {
cout << "Usage: " << argv[0] << " A numberOfConfigurations" << endl;
return 2;
}
gParameters = new DipoleModelParameters(bSat, KMW);
//To explicitly delete all new histograms myself:
TH1::AddDirectory(false);
unsigned int A=atoi(argv[1]);
unsigned int numConf=atoi(argv[2]);
cout<<"Create table for A="<<A<<" and for "<<numConf<<" configurations."<<endl;
createLookUpTableOnFile(A, numConf);
return 0;
}
double overlapFunctionT(double b)
{
// Gaussian shape for proton
// b in GeV
double BG = gParameters->BG(); // GeV^-2
double arg = (b*b/hbarc2) / (2*BG);
return 1/(2*M_PI*BG) * exp(-arg);
}
void createLookUpTableOnFile(unsigned int A, unsigned int numberOfConfigurations)
{
//
// A function to create a lookup table of nucleon configurations and save them on a file
// This function is supposed to be independent from the rest of the code
// and be called in the Main program with the nucleus number as an argument.
//
TableGeneratorNucleus myNucleus(A);
// myNucleus.init(A);
TableGeneratorSettings::instance()->setSeed(42); // sets also seed for ROOT
vector<TH2F*> hConfigurations(numberOfConfigurations);
int numBbins=1e3, numAngleBins=1e3;
double bRange=upperIntegrationLimit*myNucleus.radius()*1.1, angleRange=2*M_PI;
ostringstream histoName;
for(unsigned int iNuclei=0; iNuclei<numberOfConfigurations; iNuclei++) {
histoName.str( "" );
histoName << "Configuration_" << iNuclei;
hConfigurations[iNuclei] = new TH2F(histoName.str().c_str(), "Sum_i^A T_p(b-b_i)",
numBbins, 0., bRange, numAngleBins, 0., angleRange);
//Generate a configuration:
while(!myNucleus.generate()){}
for(int ib=1; ib <= numBbins; ib++){
double b=hConfigurations[iNuclei]->GetXaxis()->GetBinCenter(ib);
for(int iphi=1; iphi <= numAngleBins; iphi++) {
double phi=hConfigurations[iNuclei]->GetYaxis()->GetBinCenter(iphi);
TVector3 bvector=TVector3(b*cos(phi), b*sin(phi), 0.);
double sumOfT=0.;
for(unsigned int iA=0; iA < A; iA++){
sumOfT+=overlapFunctionT((bvector-myNucleus.configuration.at(iA).position()).Perp());
} //for iA
hConfigurations[iNuclei]->SetBinContent(ib, iphi, sumOfT);
}//for iphi
} //for ib
if ((numberOfConfigurations/10) && iNuclei % (numberOfConfigurations/10) == 0) {
cout<<double(iNuclei)/numberOfConfigurations*100<<"% done."<<endl;
}
} //iNuclei
cout<<"100% done."<<endl<<endl;
cout<<"Writing configurations to file...";
//Open the file and write to it:
TFile *lufile = 0;
ostringstream filename;
filename.str("");
filename << "bSat_bDependence_A" << A <<".root";
lufile = new TFile(filename.str().c_str(), "RECREATE");
for(unsigned int i=0; i<numberOfConfigurations; i++){
hConfigurations[i]->Write();
delete hConfigurations[i];
hConfigurations[i] = 0;
}
lufile->Close();
cout<<" done, bye!"<<endl;
}

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