trieste/pamVMC/field.C

#define ZCAL 13.05
#define CALS 10.639
#define ZSPEB 2.97
#define HORMG 22.57


void Field(){
  TString PL = gSystem->Getenv("PAM_LIB");
  gSystem->Load("libTree.so");
  gSystem->Load(PL+"/libyoda.so");
  gSystem->Load(PL+"/libDarthVader.so");
  gSystem->Load(PL+"/libPamLevel2.so");
  gSystem->Load(PL+"/libTrkParams.so");
  TString Calib=gSystem->Getenv("PAM_CALIB");
  TString pamcal = Calib+"/field_param-0/";
  TrkParams::SetPrecisionFactor(0.0000001);
  TrkParams::SetStepMin(10000);
  TrkParams::Set(pamcal,1);
  TrkParams::Load(1);

  float x[3];  // this is example when Bx=0;  

  const  Int_t n = 101;
  
  Double_t Bx[n];
  Double_t By[n];
  Double_t Bz[n];
  Double_t k[n];

  x[0]=.0;
  x[1]=.0;
  x[2]=-.5;

  x[2]=x[2]+(ZCAL+CALS+ZSPEB+HORMG);

  for (Int_t i=0; i<n; i++){
    x[2]=-50.+(float)i; 
    
    Bx[i]=TrkParams::GetBX((float *)x)*10.;
    By[i]=TrkParams::GetBY((float *)x)*10.;
    Bz[i]=TrkParams::GetBZ((float *)x)*10.;
x[2]=x[2]+(ZCAL+CALS+ZSPEB+HORMG);
    cout<<"X="<<x[0]<<" Y="<<x[1]<<" Z="<<x[2]<<" Bx="<<Bx[i]<<" By="<<By[i]<<" Bz="<<Bz[i]<<endl;
    k[i]=x[2];
  }
  
   TGraph *bx = new TGraph(n,k,Bx);
   TGraph *by = new TGraph(n,k,By);
   TGraph *bz = new TGraph(n,k,Bz);
   TMultiGraph *mg = new TMultiGraph();
   mg->Add(bx);
   mg->Add(by);
    mg->Add(bz);
   TCanvas *c = new TCanvas("Mag","Magnetic Field",200,10,600,400);
   mg->Draw("AC");

}
1	#define ZCAL 13.05
2	#define CALS 10.639
3	#define ZSPEB 2.97
4	#define HORMG 22.57
5
6
7	void Field(){
8	TString PL = gSystem->Getenv("PAM_LIB");
9	gSystem->Load("libTree.so");
10	gSystem->Load(PL+"/libyoda.so");
11	gSystem->Load(PL+"/libDarthVader.so");
12	gSystem->Load(PL+"/libPamLevel2.so");
13	gSystem->Load(PL+"/libTrkParams.so");
14	TString Calib=gSystem->Getenv("PAM_CALIB");
15	TString pamcal = Calib+"/field_param-0/";
16	TrkParams::SetPrecisionFactor(0.0000001);
17	TrkParams::SetStepMin(10000);
18	TrkParams::Set(pamcal,1);
19	TrkParams::Load(1);
20
21	float x[3]; // this is example when Bx=0;
22
23	const Int_t n = 101;
24
25	Double_t Bx[n];
26	Double_t By[n];
27	Double_t Bz[n];
28	Double_t k[n];
29
30	x[0]=.0;
31	x[1]=.0;
32	x[2]=-.5;
33
34	x[2]=x[2]+(ZCAL+CALS+ZSPEB+HORMG);
35
36	for (Int_t i=0; i<n; i++){
37	x[2]=-50.+(float)i;
38
39	Bx[i]=TrkParams::GetBX((float )x)10.;
40	By[i]=TrkParams::GetBY((float )x)10.;
41	Bz[i]=TrkParams::GetBZ((float )x)10.;
42	x[2]=x[2]+(ZCAL+CALS+ZSPEB+HORMG);
43	cout<<"X="<<x[0]<<" Y="<<x[1]<<" Z="<<x[2]<<" Bx="<<Bx[i]<<" By="<<By[i]<<" Bz="<<Bz[i]<<endl;
44	k[i]=x[2];
45	}
46
47	TGraph *bx = new TGraph(n,k,Bx);
48	TGraph *by = new TGraph(n,k,By);
49	TGraph *bz = new TGraph(n,k,Bz);
50	TMultiGraph *mg = new TMultiGraph();
51	mg->Add(bx);
52	mg->Add(by);
53	mg->Add(bz);
54	TCanvas *c = new TCanvas("Mag","Magnetic Field",200,10,600,400);
55	mg->Draw("AC");
56
57	}