1 void plotField(Int_t iField = 0)
4 // iField = 0 2 kG solenoid
8 // load necessary libraries
9 gSystem->Load("$(ALICE_ROOT)/lib/tgt_$(ALICE_TARGET)/libminicern");
10 gSystem->Load("$(ROOTSYS)/lib/libPhysics");
11 gSystem->Load("$(ROOTSYS)/lib/libEG");
12 gSystem->Load("$(ALICE_ROOT)/lib/tgt_$(ALICE_TARGET)/libSTEER");
18 AliMagFMaps* field = new AliMagFMaps(
22 // field-SetL3ConstField(1);
26 Float_t xMin, xMax, yMin, yMax, zMin, zMax;
30 dX = (field->FieldMap(0))->DelX();
33 dY = (field->FieldMap(0))->DelY();
36 dZ = (field->FieldMap(0))->DelZ();
37 Int_t nx = (xMax-xMin)/dX;
38 Int_t ny = (yMax-yMin)/dY;
39 Int_t nz = (zMax-zMin)/dZ;
44 TH2F* hMap = new TH2F("hMap", "Field Map y-z",
45 nz, zMin, zMax, ny, yMin, yMax);
46 TH2F* hMap1 = new TH2F("hMap1", "Field Map y-z",
47 nz, zMin, zMax, ny, yMin, yMax);
48 TH1F* hZ = new TH1F("hZ", "Field along Z",
51 TH2F* hVec = new TH2F("hVec", "Field Map y-z",
52 nz, zMin, zMax, ny, yMin, yMax);
54 TH2F* hCir = new TH2F("hCir", "Field Map y-z",
55 nz, zMin, zMax, ny, yMin, yMax);
57 for (Int_t i = 0; i < nz; i++) {
58 for (Int_t j = 0; j < ny; j++) {
66 Float_t bb = TMath::Sqrt(b[0]*b[0]+b[1]*b[1]+b[2]*b[2]);
67 if (bb > bMax) bMax = bb;
68 hMap->Fill(x[2], x[1], bb);
72 for (Int_t i = 0; i < nz; i++) {
73 for (Int_t j = 0; j < ny; j++) {
78 Float_t bb = TMath::Sqrt(b[0]*b[0]+b[1]*b[1]+b[2]*b[2]);
79 Float_t db = (bMax-bb)/bMax*100.;
81 hMap1->Fill(x[2], x[1], db);
85 for (Int_t i = 0; i < nz; i++) {
86 x[2] = zMin + i * dZ +dZ/2.;
90 Float_t bb = TMath::Sqrt(b[0]*b[0]+b[1]*b[1]+b[2]*b[2]);
94 TCanvas *c1 = new TCanvas("c1","Canvas 1",400,10,600,700);
96 TCanvas *c2 = new TCanvas("c2","Canvas 2",400,10,600,700);
98 TCanvas *c3 = new TCanvas("c3","Canvas 3",400,10,600,700);
101 Float_t scale1 = 0.9*TMath::Sqrt(dZ*dZ+dY*dY)/bMax/2.;
102 Float_t scale2 = 0.005/bMax;
106 for (Int_t i = 0; i < nz; i++) {
107 for (Int_t j = 0; j < nx; j++) {
108 x[2] = zMin + i * dZ + dZ/2.;
109 x[0] = xMin + j * dX + dX/2.;
112 Float_t bb = TMath::Sqrt(b[0]*b[0]+b[1]*b[1]+b[2]*b[2]);
115 Float_t width = 0.005+scale2*b[1];
116 arrow = new TArrow(x[2], x[0], x[2]+b[2], x[0]+b[0], width,"|>");
117 arrow->SetFillColor(1);
118 arrow->SetFillStyle(1001);
125 TCanvas *c4 = new TCanvas("c4","Canvas 4",400,10,600,700);
127 for (Int_t i = 0; i < nz; i++) {
128 for (Int_t j = 0; j < ny; j++) {
129 x[2] = zMin + i * dZ + dZ/2.;
130 x[1] = yMin + j * dY + dY/2.;
133 Float_t bb = TMath::Sqrt(b[0]*b[0]+b[1]*b[1]+b[2]*b[2]);
135 ellipse= new TEllipse(x[2], x[1], b[1]*scale1/4., b[1]*scale1/4.,0,360,0);