Etude pour RPC 2018

On ne s'occupe que du FE5 , i.e TDC8 , DIF 2058

Alignment pistes separees a 515 DAC count

Run piste branchees ⇒ 739032

Run pistes debranchees ⇒ 739033

On reprend les resultats avec FE2 (celui qui est mort) Injection cote large

{
  TCanvas *c1 = new TCanvas("c1","A Simple Graph with error bars",200,10,700,1200);
  gStyle->SetMarkerStyle(8);
  gStyle->SetMarkerSize(.5);
  gStyle->SetOptFit();
  
  c1->GetFrame()->SetBorderSize(12);
  c1.Divide(1,2);
  Float_t ic[7]={200,225,250,300,350,400,500};
  Float_t dic[7]={1,1,1,1,1,1,1};
  Float_t thrHR[7]={502,507,513,522,532,541,559};
  Float_t dthrHR[7]={1,1,1,1,1,1,1};
  Float_t thrLR[7]={497,502,505.5,516,525,534,550};
  Float_t dthrLR[7]={1,1,1,1,1,1,1};
  c1.cd(1);
  TGraphErrors *gr = new TGraphErrors(7,ic,thrHR,dic,dthrHR);
  gr->SetName("gr");
  gr->SetTitle("Turn on DAC (High Radius) vs Injection");
  gr->SetMarkerColor(4);
  gr->SetMarkerStyle(21);
  gr->Draw("ap");
  gr->Fit("pol1");
  gr->GetXaxis()->SetTitle("Injection (fC)");
  gr->GetYaxis()->SetTitle("Turn On (DAC unit)");
  c1.cd(2);
  TGraphErrors *grl = new TGraphErrors(7,ic,thrLR,dic,dthrLR);
  grl->SetTitle("Turn on DAC (Low Radius) vs Injection");
  grl->SetName("grl");
  grl->SetMarkerColor(3);
  grl->SetMarkerStyle(22);
  grl->Draw("ap");
  grl->Fit("pol1");
  grl->GetXaxis()->SetTitle("Injection (fC)");
  grl->GetYaxis()->SetTitle("Turn On (DAC unit)");
  
  c1->Modified();

  c1->Update();
}

Fig. 1: Turn -on (DAC VTH) en fonction de l'injection

On met le seuil a 494

(494-471)/0.1845 = 125 fC /2 ⇒ 62.5 fC de seuil par canal

On des burst de bruits…. ce qui explique les fluctuations

Si on met le seuil a 496 et 200 mV

Fig. 2: Efficacite de detectiron du cote de l'injection (orange) et oppose (bleu)

{
  TCanvas *c1 = new TCanvas("c1","A Simple Graph with error bars",200,10,700,700);
 
 
  Float_t ic[5]={170,180,190,200,210};
  Float_t dic[5]={1,1,1,1,1};
  Float_t NTR[5]={3097,3094,3094,3093,3095};
  Float_t NHR[5]={2611,3041,3092,3093,3095};
  Float_t NLR[5]={699,2040,2718,3008,3034};

  Float_t eff1[5],deff1[5],eff2[5],deff2[5];
  for (Int_t i=0;i<5;i++)
    {
      eff1[i]=NHR[i]/NTR[i];
      if (NHR[i] != NTR[i])
	deff1[i]=sqrt(eff1[i]*(1.-eff1[i])/NTR[i]);
      else
	deff1[i]=sqrt(2/NTR[i]);
       eff2[i]=NLR[i]/NTR[i];
      if (NLR[i] != NTR[i])
	deff2[i]=sqrt(eff2[i]*(1.-eff2[i])/NTR[i]);
      else
	deff2[i]=sqrt(2/NTR[i]);
    }
  
  TGraphErrors *grl = new TGraphErrors(5,ic,eff2,dic,deff2);
  grl->SetTitle("Efficiency vs Injection (Cut 494 DAC)");
  grl->SetName("grl");
  grl->SetMarkerColor(4);
  grl->SetMarkerStyle(22);
  grl->Draw("ap");

  TGraphErrors *gr = new TGraphErrors(5,ic,eff1,dic,deff1);
  gr->SetName("gr");

  gr->SetMarkerColor(2);
  gr->SetMarkerStyle(21);
  gr->Draw("p");
  grl->GetXaxis()->SetTitle("Injection (fC)");
  grl->GetYaxis()->SetTitle("Efficiency ");
  c1->Modified();

  c1->Update();
}

Resolution la plus mauvaise observee ~ 0.3/8.6 ⇒ 5 cm

Su la figure 2 on observe:

• Seuil minimal de detection electronique ⇒ 90 fC, Q injected 180 fC

• Seuil minimal de mesure X,Y Q injected 200 fC

Les résultats sont quasiment identiques à ceux mesurés avec le Board 3 (FE #4)

Et pour la resolution

{
  TCanvas *c1 = new TCanvas("c1","A Simple Graph with error bars");
 
 
  Float_t ic[11]={160,170,180,190,200,210,220,230,250,500,1000};
  Float_t dic[11]={1,1,1,1,1,1,1,1,1,1,1};
  Float_t res[11]={0.402,0.377,0.326,0.292,0.252,0.228,0.220,0.239,0.192,0.077,0.051};

  Float_t dres[11];
  for (Int_t i=0;i<11;i++)
    {
      dres[i]=0.01;
    }
  
  TGraphErrors *grl = new TGraphErrors(11,ic,res,dic,dres);
  grl->SetTitle("Time resolution on difference vs Injection");
  grl->SetName("grl");
  grl->SetMarkerColor(4);
  grl->SetMarkerStyle(22);
  grl->Draw("ap");
  grl->GetXaxis()->SetTitle("Injection (fC)");
  grl->GetYaxis()->SetTitle("Resolution (ns) ");

  c1->Modified();

  c1->Update();
}

Injection cote HR

— DAQ user 2018/01/30 09:20

100 kOhm sur l'alim au lieu de 150 k