CosmicsBox.cc

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#include "CosmicsBox.h"
 
void CosmicsBox::Print_Phi_ew(vector<int> phi_chx, vector<float> ly_C0, vector<int> SiPMchannels, float windowmin, float windowmax, float maxfrom, float maxto, int nbins, bool corr, bool periodic) {
    checkData();
    
    // plotting uncorrected/corrected phi_ew - spectra ; first: map the phi_i to the channels, like Alex did, but with new channel positions
    // match channel number to channel index (still very specific)
    int sipmnum = SiPMchannels.size();
    vector<int> ch_index; for (int i = 0; i < sipmnum; i++) ch_index.push_back(0); // initialize the ch_index vector
    for (int i = 0; i < static_cast<int>(active_channels.size()); i++) {
        for (int j = 0; j < sipmnum; j++) {
            if (active_channels[i] == SiPMchannels[j]) ch_index[j] = i;
        }
    }
 
    // compute correction factor
    vector<float> ly_corr;
    if (corr) {
        float ly_av = 0;
        // average lightyield of all channels * sipmnum
        for (int i = 0; i < sipmnum; i++) ly_av += ly_C0[i];
        // divide ly of one channel by (1/sipmnum)*sipmnum*average ly of all channels
        for (int i = 0; i < sipmnum; i++) ly_corr.push_back(sipmnum * ly_C0[i] / ly_av);
    }
    else for (int i = 0; i < sipmnum; i++) ly_corr.push_back(1); // no correction
 
    // print correction factors
    for (int i = 0; i < sipmnum; i++) cout << "Correction factor for channel " << SiPMchannels[i] << ":" << ly_corr[i] << endl;
 
    // initialize canvas + histograms
    gStyle->SetOptStat("emr"); gStyle->SetOptFit(1111); //draws a box with some histogram parameters
    TString his_name(Form("#phi_ew-spectrum_from_ch%d_to_ch%d", SiPMchannels.front(), SiPMchannels.back()));
    TCanvas* hisc = new TCanvas(his_name, his_name, 600, 400);
 
    double min_angle = -180, max_angle = 180; // 360 deg plot range
    if (periodic) { min_angle = -540; max_angle = 540; } // 1080 deg plot range
    TH1* his = new TH1F(his_name, his_name, nbins, min_angle, max_angle);
 
    // loop through all events and compute phi_ew
    float lightyield, anglevaluex, anglevaluey, phi_ew = 0;
    for (int i = 0; i < nevents; i++) {
        if (!skip_event[i]) {
            for (int j = 0; j < sipmnum; j++) { //loop through all SiPM-channels
                TH1F* hisly = Getwf(i * nchannels + ch_index[j]);
                lightyield = GetPeakIntegral(hisly, windowmin, windowmax, maxfrom, maxto, 0); //lightyield as the integral around maximum
                anglevaluex += cos(phi_chx[j] * TMath::Pi() / 180) * lightyield / ly_corr[j]; //x part of vectorial addition
                anglevaluey += sin(phi_chx[j] * TMath::Pi() / 180) * lightyield / ly_corr[j]; //y part of vectorial addition
            }
 
            phi_ew = atan2(anglevaluey, anglevaluex) * 180 / TMath::Pi(); //vectorial addition for phi_ew --> fill in histo
            his->Fill(phi_ew);
            if (periodic) {
                his->Fill(phi_ew + 360);
                his->Fill(phi_ew - 360);
            }
            anglevaluex = 0, anglevaluey = 0; //reset the x and y parts
        }
    }
 
    //make histogram fancy + printing
    his->GetXaxis()->SetTitle("#phi_{ew} [#circ]"); 
    his->GetYaxis()->SetTitle("#Entries");
    his->Draw();
 
    if (periodic) {
        Fitf_periodic_gauss fitf;
        int n_par = 4;
        TF1* f = new TF1("fitf", fitf, min_angle, max_angle, n_par); 
        f->SetLineColor(2);
        f->SetNpx(1000);
 
        double max = his->GetMaximum();
        double min = his->GetMinimum();
        his->GetXaxis()->SetRangeUser(-180, 180); //only look at one period for starting values
        double phi_est = his->GetXaxis()->GetBinCenter(his->GetMaximumBin());
        his->GetXaxis()->SetRangeUser(0, 0); //reset scale
 
        f->SetParName(0, "A");                  f->SetParameter(0, max - min);      f->SetParLimits(0, 1, 1e9);
        f->SetParName(1, "#bar{#phi_{ew}}");    f->SetParameter(1, phi_est);        f->SetParLimits(1, -180, 180);
        f->SetParName(2, "#sigma");             f->SetParameter(2, 40);             f->SetParLimits(2, 5, 360);
        f->SetParName(3, "offset");             f->SetParameter(3, min);            f->SetParLimits(3, TMath::Min(min - 1, 0.1), 1e9);
 
        TFitResultPtr fresults = his->Fit(f, "LRS");
        fit_results.push_back(fresults);
    }
 
    hisc->Update();
    root_out->WriteObject(hisc, "Phi_ew");
    root_out->WriteObject(his, "Phi_ew_his");
 
    string pdf_name = "phi_ew_spectrum";
    pdf_name += corr ? "_corr.pdf" : "_uncorr.pdf";
    hisc->SaveAs(pdf_name.c_str()); //write the histogram to a .pdf-file
}