Gabriele Cosmo
214 lines
11 KiB
C++
214 lines
11 KiB
C++
#include "Riostream.h"
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#include "TSystem.h"
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#include "TInterpreter.h"
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#include "TROOT.h"
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#include "TApplication.h"
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#include "TFile.h"
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#include "TNtuple.h"
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#include "TCanvas.h"
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#include "TH1F.h"
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#include "THStack.h"
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#include "TCut.h"
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#include "TString.h"
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#include "TMath.h"
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/***************************
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* Root script that produces a graph of the angular distribution of
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* a certain type of charged fragment (default Z=1).
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*
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* Results are not stored in a histogram.
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*
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* This can be compared to measurements made with a square
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* detector that is being moved around. Such as that of E.Haettner[1].
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*
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* Results are normalized to the 0-angle because documentation on E.Haettner's
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* normalization is not found.
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*
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* @author Gillis Danielsen
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* **************************/
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void fragmentAngularDistributionGM() {
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TCanvas *c1 = new TCanvas("AngularDistribution", "Angular distribution with discrete measurement annuluses");
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gROOT->SetStyle("clearRetro");
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//this will be used as base for pulling the experimental data
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TString dir = gSystem->UnixPathName(gInterpreter->GetCurrentMacroName());
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ifstream in;
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//Settings for analysis
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TString pDepth = "5.9"; //set ehre what depth to analyse, requries suitable root file and data file
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TString fragment = "H"; //string of what fragment is being looked at H, He, Li ...
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TString Anum = "1"; //set here what will be put in the selection for z, does not automatically change imoprted data.
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//TString experimentalDataFile = "experimentalData/iaeaBenchmark/angularDistributions/" + pDepth + "/" + fragment + pDepth + ".dat";
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//in.open(Form("experimentalData/iaeaBenchmark/angularDistributions/" + pDepth + "/" + fragment + pDepth + ".dat",dir.Data()));
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in.open(Form("experimentalData/iaeaBenchmark/alternativeGMBeamAD.dat",dir.Data())); //fixme: redundant dir.data()
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std::cout << "experimentalData/iaeaBenchmark/angularDistributions/" + pDepth + "/" + fragment + pDepth + ".dat" << endl;
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std::cout << "didata" << dir.Data() << endl;
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Float_t f1,f2;
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Int_t nlines = 0;
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TFile *f = new TFile("fragmentAngularDistribution.root","RECREATE");
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TNtuple *ntuple = new TNtuple("ntuple","Data from ascii file","x:y");
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Char_t DATAFLAG[4];
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Int_t NDATA;
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Char_t n1[15], n2[15];
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in >> DATAFLAG >> NDATA ; // Read EXFOR line: 'DATA 6'
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in >> n1 >> n2; // Read column titles: 'Energy He B [...]'
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cout <<n1<<" "<<n2<<"\n";
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while (1) {
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in >> f1 >> f2;
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if (!in.good()) break;
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if (nlines < 500 ) printf("%f %f\n",f1,f2);
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ntuple->Fill(f1,f2);
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nlines++;
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}
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std::cout << "Imported " << nlines << " lines from data-file" << endl;
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//Let's pull in the simulation-data
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//TFile *MCData = TFile::Open("IAEA_" + pDepth + ".root");
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TFile *MCData = TFile::Open("IAEA_G-M.root");
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TNtuple *fragments = (TNtuple*) MCData->Get("fragmentNtuple");
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//Block bellow pulls out the simulation's metadata from the metadata ntuple.
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TNtuple *metadata = (TNtuple*) MCData->Get("metaData");
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Float_t events, detectorDistance,waterThickness,beamEnergy,energyError,phantomCenterDistance;
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metadata->SetBranchAddress("events",&events);
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metadata->SetBranchAddress("waterThickness",&waterThickness);
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metadata->SetBranchAddress("detectorDistance",&detectorDistance);
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metadata->SetBranchAddress("beamEnergy",&beamEnergy);
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metadata->SetBranchAddress("energyError",&energyError);
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metadata->SetBranchAddress("phantomCenterDistance",&phantomCenterDistance);
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metadata->GetEntry(0); //there is just one row to consider.
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//good to keep for ref. G4 might give weird units due to change.
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metadata->Scan();
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//ALL UNITS ARE cm!
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Double_t detectorSideLength = 4; //40mm, as e.haettner H1 detector, G-M uses 1.6cm sidelength (which is however to small for < 1 million events files
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Double_t scatteringDistance = detectorDistance - phantomCenterDistance; //temporarily hard-coded, should be distance from target-center to detector
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Double_t r;
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Double_t degrees;
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Double_t rMin;
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Double_t rMax;
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TString rMinString;
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TString rMaxString;
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Double_t maxValue = 0.0; //When normalizing to 1 this will allways end up being 1)
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int i = 0; //so that the degree steps can be varied to unevenly spaced values separate counter is used
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TNtuple* distrib = new TNtuple("angularDistrib","FragmentAngularDistrib","angle:particleAmount:normalized");
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std::cout << "Fragments comparison to the graphs in appendices of E.Haettner\n";
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std::cout << "Scattering distance: " << scatteringDistance << " cm" << endl ;
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std::cout << "(scattering distance may vary with data-files too, see haettner A.1." << endl << endl;
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//This will norm it to the zero degree entry to get rid of Emma's weird normalization
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//fixme detectorsidelengthstring
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rMinString = "0.00";
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rMaxString = Form("%f", detectorSideLength/2);
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//SA of a square Double_t zeroSAsquare = 4 * TMath::ASin(pow(detectorSideLength,2.0) / (4*pow(scatteringDistance,2) + pow(detectorSideLength,2)) );
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//SA with square approx squareApprox = (4*4) / (4*3.14*scatteringDistance*scatteringDistance);
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//First calculates the normalization from the zero position
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//Normalization by events becomes redundant but is left in place for future needs
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Double_t deltaPhi = TMath::ATan((detectorSideLength/2)/scatteringDistance); //Angle where side of detector is found
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/*
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//Alternative normalization, here zero position is also done with annulus where rMin=0, the actual detector is a square though
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//Difference with this approach and the other is very small
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Double_t normEntries = fragments->GetEntries("(Z == " + Anum + " && energy > 0 && sqrt(posY^2 + posZ^2) < " + rMaxString + "&& sqrt(posY*posY + posZ*posZ) > " + rMinString + ")");
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Double_t zeroSA = 2*TMath::Pi()*(TMath::Cos(0) - TMath::Cos(deltaPhi));
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*/
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//fragments->Scan();
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//Results are normalized by a square detector mimicing H1 with center at 0 degrees.
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Double_t normEntries = fragments->GetEntries("(A == " + Anum + " && posY < " + rMaxString + " && posY > -" + rMaxString + " && posZ > -" + rMaxString + " && posZ < " + rMaxString + ")");
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Double_t zeroSA = 4 * TMath::ASin(pow(detectorSideLength,2.0) / (4*pow(scatteringDistance,2) + pow(detectorSideLength,2)) );
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Double_t zeroNorm = normEntries / (events * zeroSA);
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distrib->Fill(0,normEntries,zeroNorm); //< degrees, entyamount, normalized result for graph
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//fragments->Scan();
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std::cout << "Norming events: " << normEntries << endl;
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//Loop through all other wanted angles, too large angles will fall outside reach of phantom window.
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for(Double_t j = deltaPhi*TMath::RadToDeg(); j <= 15.0; j=j+.05){
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i++;
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degrees = j * TMath::DegToRad();
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//Distance from straight beam at the requested angle
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r = scatteringDistance * TMath::Tan(degrees);
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//now the "detector is rotated around all possible perpendicularlynangle values to beamline".
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//This forms an annulus with rMin and Rmax as outer and inner radiuses
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//this will give a bit of approximation at small angles and at 0 degrees this gives a completely round sensor.
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Double_t deltaPhi = TMath::ATan((TMath::Cos(degrees)*detectorSideLength)/(2*scatteringDistance));
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rMin = TMath::Max(0.0,r - (detectorSideLength/(2*TMath::Cos(degrees))));
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rMax = rMin + ((detectorSideLength*TMath::Sin(degrees))/TMath::Tan((TMath::Pi()/2) - degrees - deltaPhi)) + (detectorSideLength*TMath::Cos(degrees));
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rMinString = Form("%f", rMin);
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rMaxString = Form("%f", rMax); /*
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* From Gunzert-marx. Solid angle of annulus with rmin trmax,
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* a bit of an aproximation especially at small phi.
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*/
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Double_t deltaOmega = 2*TMath::Pi()*(TMath::Cos(TMath::Max(0.0,degrees-deltaPhi)) - TMath::Cos(degrees+deltaPhi));
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int numEntries = fragments->GetEntries("(A == " + Anum + " && sqrt(posY^2 + posZ^2) < " + rMaxString + "&& sqrt(posY*posY + posZ*posZ) > " + rMinString + ")");
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//distrib->Fill(j,numEntries,numEntries/(deltaOmega * events * zeroNorm)); //< degrees, entyamount, normalized result for graph
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distrib->Fill(j,numEntries,numEntries/(deltaOmega * events));
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//distrib->Fill(-j,numEntries,numEntries/(deltaOmega * events * zeroNorm)); //< To get gaussian shape better visible
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distrib->Fill(-j,numEntries,numEntries/(deltaOmega * events));
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maxValue = TMath::Max(maxValue, numEntries/(deltaOmega * events)); //< for calculation of FWHM
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}
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distrib->SetMarkerStyle(2); //filled dot
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distrib->SetMarkerColor(kBlue);
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distrib->Draw("normalized:angle","angle > -3 && angle < 14","p"); //similar axises to e.haettner
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ntuple->SetMarkerStyle(22); //triangle
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ntuple->SetMarkerColor(kRed);
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Float_t zeroPosData; //This is where we store what we norm the experimental data with
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Float_t zeroPosAngle; //okay, so this should be zero, but regrettably is not allways that
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ntuple->SetBranchAddress("y",&zeroPosData);
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ntuple->SetBranchAddress("x",&zeroPosAngle);
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int row = 0;
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ntuple->GetEntry(row); //Pull the first row, usually is the right one
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while(zeroPosAngle*zeroPosAngle > .01){
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row++;
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ntuple->GetEntry(row);
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if(row == ntuple->GetEntries()){
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std::cerr << "Could not find zero angle data in imported experimental data. Change normalization or relax exactness of this check." << endl;
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exit();
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}
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}
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std::cout << "For zero-position of experimental data using angle " << zeroPosAngle << " with amount " << zeroPosData << " on row " << row << endl;
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TString experimentalNorm = Form("(1/%f)*", zeroPosData);
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ntuple->Draw(experimentalNorm + "y:x","","p,same");
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//Calculate FWHM, ineffective solution. (but works also without normalizing to 1)
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Float_t fwhm = 0.0, middle = 0.0, currentX, currentY;
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distrib->SetBranchAddress("normalized",¤tY);
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distrib->SetBranchAddress("angle",¤tX);
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for(int i = 0; i < distrib->GetEntries(); i++){
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distrib->GetEntry(i);
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if(pow(maxValue/2 - middle, 2.0) > pow(maxValue/2 - currentY, 2.0)){
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fwhm = 2*currentX;
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middle = currentY;
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}else{
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}
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}
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std::cout << "Calculated (closest point) FWHM of Monte-Carlo simulation to be: " << fwhm << " degrees" << endl;
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/*
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* This code is left here because it allows to calcualte the values without using annuluses
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* this of course is a bit more like the experimental data but statistically less precise.
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for(Double_t p = 0.0;p < 14.0; p = p + 1.0){
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rMinString = "0.00";
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rMaxString = "2.00";
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TString plusY = Form("(posY - %f)", p);
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TString plusZ = Form("(posZ - %f)", p);
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Double_t deltaPhi = TMath::ATan((detectorSideLength/2)/scatteringDistance);
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Double_t normEntries = fragments->GetEntries("(Z == " + Anum + " && energy > 0 && sqrt(" + plusY + "^2 + " + plusZ + "^2) < " + rMaxString + "&& sqrt("+plusY + "^2 + " + plusZ + "^2) > " + rMinString + ")");
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//std::cout << "(Z == " + Anum + " && energy > 0 && sqrt(" + plusY + "^2 + " + plusZ + "^2) < " + rMaxString + "&& sqrt("+plusY + "^2 + " + plusZ + "^2) > " + rMinString + ")";
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Double_t zeroSA = 2*TMath::Pi()*(TMath::Cos(0) - TMath::Cos(deltaPhi));
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std::cout << "with " << p << "cm the amount is " << normEntries << " / " << normEntries /(events*zeroSA) << endl;
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}
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*/
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c1->SaveAs("AD_for_Z_" + Anum + "_ComparedToGM.png");
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in.close();
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f->Write();
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}
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