* Progress on Nebula calibration

Projects/S034/Calibration/Nebula/gamma.cxx

+TChain* MakeChain1();
+TChain* MakeChain2();
+TChain* MakeChain();
+TH2F*   MakeTH2();
+TH2F*   GetTH2();
+double off;
+double c_light=299.792458;//mm/ns
+auto chain = MakeChain();
+void process1bar(int b);
+auto h = new TH2F("h","h",200,0,200,500,0,1000);
+auto r = new TH2F("r","r",200,0,200,10000,17000,20000);
+ofstream output("Calibration/Nebula/offset_gamma.txt");
+////////////////////////////////////////////////////////////////////////////////
 void gamma(){
+  double beta=0.5504;
+  // Distance from SBT(-7377.56) to target(3774.7 for FP + a value for each target)
+  double D1=7377.56-3774.7+2.795;
+  double D2=7377.56-3774.7+6.972;
+  // time offset for each case
+  double off1 = D1/(beta*c_light);
+  double off2 = D2/(beta*c_light);
+  off = (off1+off2)*0.5;
+  cout << "Offset1 : " << off1 << endl;
+  cout << "Offset2 : " << off2 << endl;
+  cout << "Mean : " << off << endl;
+  auto c = new TCanvas("tof","tof");
 
+  chain->SetAlias("R","sqrt(Nebula.PosX*Nebula.PosX+Nebula.PosY*Nebula.PosY+(Nebula.PosZ+3774.7)*(Nebula.PosZ+3774.7))");
+  h=GetTH2();
+  h->Draw("colz");
+  for(unsigned int i = 0 ; i < 160 ; i++){
+    process1bar(i); 
+  }
+  output.close();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+void process1bar(int b){
+  new TCanvas();
+  // Get the Radius for the distance to this barre
+  auto r1 = r->ProjectionY(Form("h%d",b),b,b+1);  
+  double R =  r1->GetBinCenter(r1->GetMaximumBin());
+
+  auto h1 = h->ProjectionY(Form("h%d",b),b,b+1);
+  double max = h1->GetBinCenter(h1->GetMaximumBin());
+  h1->Draw();
+  auto f = new TF1("f","gaus(0)",max-50,max+50);
+  f->SetParameter(0,h1->GetMaximum());
+  f->SetParameter(1,max);
+  f->SetParameter(2,50);
+  h1->Fit(f,"R");
+  
+    // V = R/(TOF-off) -> (TOF-off)/R = 1/V 
+  // off = TOF-R/V
+  double offset=f->GetParameter(1)-R/c_light ;
+  cout <<f->GetParameter(1) << " " <<  offset << " " << R/(f->GetParameter(1)-offset) << endl;
+  if(offset>0)
+    output << "NEBULA_T_ID"  << b << " " << -offset << endl; 
+}
+////////////////////////////////////////////////////////////////////////////////
+TH2F* GetTH2(){
+  auto File= new TFile("Calibration/Nebula/hist_v.root");
+  h = (TH2F*) File->FindObjectAny("h");
+
+  File= new TFile("Calibration/Nebula/hist_r.root");
+  r = (TH2F*) File->FindObjectAny("r");
+  return h;
+  }
+
+////////////////////////////////////////////////////////////////////////////////
+TH2F* MakeTH2(){
+  TString cond=Form("(Nebula.TOF-%f)>20&&(Nebula.TOF-%f)<38",off,off);
+  TString draw=Form("R/(Nebula.TOF-%f):Nebula.DetectorNumber>>h",off); 
+  chain->Draw(draw,cond,"colz");
+  h->SaveAs("Calibration/Nebula/hist_v.root");
+
+  chain->Draw("R:Nebula.DetectorNumber>>r","","colz");
+  r->SaveAs("Calibration/Nebula/hist_r.root");
+
+  return h;
+  }
+
+////////////////////////////////////////////////////////////////////////////////
+TChain* MakeChain(){
   auto chain = new TChain("PhysicsTree");
-  chain->Add("root/analysis/gamma/run418.root");
+  chain->Add("root/analysis/gamma/run*.root");
+  return chain;
+}
 
-  chain->Draw("(Nebula.PosZ+4650)/Nebula.TOF:Nebula.DetectorNumber>>h(150,0,150,2000,0,500)","","colz");
+////////////////////////////////////////////////////////////////////////////////
+TChain* MakeChain1(){
+  auto chain = new TChain("PhysicsTree");
+  for(unsigned int i = 418 ; i < 442  ; i++){
+    chain->Add(Form("root/analysis/gamma/run%d.root",i));
+  }
+  return chain;
+}
 
+////////////////////////////////////////////////////////////////////////////////
+TChain* MakeChain2(){
+  auto chain = new TChain("PhysicsTree");
+  for(unsigned int i = 488 ; i < 498  ; i++){
+    chain->Add(Form("root/analysis/gamma/run%d.root",i));
   }
+  return chain;
+}

Projects/S034/calibration.txt

@@ -4,5 +4,5 @@ CalibrationFilePath
   Calibration/FDC2_Calib.txt
   Calibration/FDC0_Calib.txt
   Calibration/CalibVDrift/CalibVDrift.txt
-  Calibration/Nebula/Nebula_T.txt
+  Calibration/Nebula/offset_gamma.txt
   Calibration/Nebula/Nebula_Y.txt