* Progress on Nebula Calibration

Projects/S034/Calibration/Nebula/gamma.cxx

 TChain* MakeChain1();
 TChain* MakeChain2();
 TChain* MakeChain();
-TH2F*   MakeTH2();
-TH2F*   GetTH2();
+TH1F*   GetV(unsigned int b);
+TH1F*   GetR(unsigned int b);
 TGraph* graph = new TGraph();
 unsigned int point = 1;
 double off;
 double c_light=299.792458;//mm/ns
 auto chain = MakeChain();
 void process1bar(int b);
-auto h = new TH2F("h","h",200,0,201,500,0,1000);
 auto r = new TH2F("r","r",200,0,201,10000,17000,20000);
 ofstream output("Calibration/Nebula/offset_gamma.txt");
 ////////////////////////////////////////////////////////////////////////////////
@@ -28,8 +27,6 @@ void gamma(){
   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");
   new TCanvas();
   unsigned int select =60;
   for(unsigned int i = 0 ; i < 150 ; i++){
@@ -46,13 +43,15 @@ void gamma(){
 ////////////////////////////////////////////////////////////////////////////////
 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);  
-  r1->Rebin(4);
+  // Get the Radius for the distance to this bar
+  auto r1 = GetR(b);  
+  //r1->Rebin(4);
   double R =  r1->GetBinCenter(r1->GetMaximumBin());
 
-  auto h1 = h->ProjectionY(Form("h%d",b),b,b+1);
-  h1->Rebin(8);
+  auto h1 = GetV(b);
+  if(h1->GetEntries()<10)
+    return;
+  //h1->Rebin(8);
   double max = h1->GetBinCenter(h1->GetMaximumBin());
   //h1->Draw();
   auto f = new TF1("f","gaus(0)+pol0(3)",max-100,max+100);
@@ -81,28 +80,23 @@ void process1bar(int b){
     }
 }
 ////////////////////////////////////////////////////////////////////////////////
-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");
+TH1F* GetV(unsigned int b){
+  auto File= new TFile("Calibration/Nebula/hist_gamma.root");
+  auto h = (TH1F*) File->FindObjectAny(Form("h%d",b));
+  h->Rebin(4);
+  h->GetXaxis()->SetRangeUser(500,800);
+//  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");
-
+TH1F* GetR(unsigned int b){
+  auto File= new TFile("Calibration/Nebula/hist_gamma.root");
+  auto h = (TH1F*) File->FindObjectAny(Form("r%d",b));
   return h;
   }
 
+
 ////////////////////////////////////////////////////////////////////////////////
 TChain* MakeChain(){
   auto chain = new TChain("PhysicsTree");

Projects/S034/Calibration/Nebula/make_gamma.cxx

+
+TChain* MakeChain();
+
+double c_light=299.792458;//mm/ns
+void make_gamma(){
+
+  auto file = new TFile("Calibration/Nebula/hist_gamma.root","RECREATE");
+  // Create histograms
+  vector<TH1F*> h,r;
+  for(unsigned int i = 0 ; i < 150 ; i++){
+    TString name = Form("h%d",i);
+    h.push_back(new TH1F(name,name,500,0,1000));
+    name = Form("r%d",i);
+    r.push_back(new TH1F(name,name,10000,17000,20000));
+  }
+
+  auto chain = MakeChain();
+  auto neb = new TNebulaPhysics();
+
+  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);
+  double off = (off1+off2)*0.5;
+
+  cout << "Offset1 : " << off1 << endl;
+  cout << "Offset2 : " << off2 << endl;
+  cout << "Mean : " << off << endl;
+
+  chain->SetBranchAddress("Nebula",&neb);
+  unsigned int size = chain->GetEntries();
+
+ // unsigned int size = 10000;
+  for(unsigned int i = 0 ; i < size ; i++){
+    if(i%1000==0)
+      cout << "\r entry " << i << " / " << size << flush; 
+    chain->GetEntry(i); 
+    if(neb->DetectorNumber.size()==1){
+      double R = sqrt(neb->PosX[0]*neb->PosX[0]+neb->PosY[0]*neb->PosY[0]+(neb->PosZ[0]+3774.7)*(neb->PosZ[0]+3774.7));
+      double v = R/(neb->TOF[0]-off); 
+      h[neb->DetectorNumber[0]]->Fill(v);
+      r[neb->DetectorNumber[0]]->Fill(R);
+    }
+  }
+ 
+ for(auto it = h.begin(); it !=h.end(); it++)
+   (*it)->Write();
+  for(auto it = r.begin(); it !=r.end(); it++)
+   (*it)->Write();
+  
+  file->Close();
+cout << endl; 
+}
+////////////////////////////////////////////////////////////////////////////////
+TChain* MakeChain(){
+  auto chain = new TChain("PhysicsTree");
+  chain->Add("root/analysis/gamma/run*.root");
+  return chain;
+}

Projects/S034/Calibration/Nebula/offset_gamma.txt

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