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njacazionjacazio
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Update field
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Lines changed: 63 additions & 47 deletions

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‎Detectors/Upgrades/ALICE3/macros/ALICE3Field.C‎

Lines changed: 33 additions & 33 deletions
Original file line numberDiff line numberDiff line change
@@ -11,53 +11,46 @@
1111
//
1212
// Author: J. E. Munoz Mendez jesus.munoz@cern.ch
1313

14+
#include <functional>
15+
#include <cmath>
16+
#include <TCanvas.h>
17+
#include <TH2F.h>
18+
#include <TStyle.h>
19+
1420
std::function<void(const double*, double*)> field()
1521
{
1622
return [](const double* x, double* b) {
17-
double Rc;
18-
double R1;
19-
double R2;
20-
double B1;
21-
double B2;
22-
const double beamStart = 500.; //[cm]
23-
const double tokGauss = 1. / 0.1; // conversion from Tesla to kGauss
24-
25-
bool isMagAbs = true;
26-
27-
// ***********************
28-
// LAYOUT 1
29-
// ***********************
30-
3123
// RADIUS
32-
Rc = 185.; //[cm]
33-
R1 = 220.; //[cm]
34-
R2 = 290.; //[cm]
24+
static constexpr double Rc = 170.; // [cm] — R_out_coil per Ian DetectorConstruction.cc; confirmed by A. Ortiz definition
25+
static constexpr double R1 = 220.; // [cm]
26+
static constexpr double R2 = 290.; // [cm]
3527

36-
// To set the B2
37-
B1 = 2.; //[T]
38-
B2 = -Rc * Rc / ((R2 * R2 - R1 * R1) * B1); //[T]
28+
// FIELD
29+
static constexpr double B1 = 2.; // [T]
30+
static constexpr double B2 = -B1 * Rc * Rc / (R2 * R2 - R1 * R1); // [T] — B1 in numerator, confirmed by A. Ortiz Aug 2026
31+
static constexpr double beamStart = 500.; // [cm]
32+
static constexpr double tokGauss = 1. / 0.1; // conversion from Tesla to kGauss
3933

40-
if ((abs(x[2]) <= beamStart) && (sqrt(x[0] * x[0] + x[1] * x[1]) < Rc)) {
34+
static constexpr bool isMagAbs = true;
35+
36+
const double r = sqrt(x[0] * x[0] + x[1] * x[1]);
37+
if ((abs(x[2]) <= beamStart) && (r < Rc)) { // We are inside of the central region
4138
b[0] = 0.;
4239
b[1] = 0.;
4340
b[2] = B1 * tokGauss;
44-
} else if ((abs(x[2]) <= beamStart) &&
45-
(sqrt(x[0] * x[0] + x[1] * x[1]) >= Rc &&
46-
sqrt(x[0] * x[0] + x[1] * x[1]) < R1)) {
41+
} else if ((abs(x[2]) <= beamStart) && (r >= Rc && r < R1)) { // We are in the transition region
4742
b[0] = 0.;
4843
b[1] = 0.;
4944
b[2] = 0.;
50-
} else if ((abs(x[2]) <= beamStart) &&
51-
(sqrt(x[0] * x[0] + x[1] * x[1]) >= R1 &&
52-
sqrt(x[0] * x[0] + x[1] * x[1]) < R2)) {
45+
} else if ((abs(x[2]) <= beamStart) && (r >= R1 && r < R2)) { // We are within the magnet
5346
b[0] = 0.;
5447
b[1] = 0.;
5548
if (isMagAbs) {
5649
b[2] = B2 * tokGauss;
5750
} else {
5851
b[2] = 0.;
5952
}
60-
} else {
53+
} else { // We are outside of the magnet
6154
b[0] = 0.;
6255
b[1] = 0.;
6356
b[2] = 0.;
@@ -67,10 +60,14 @@ std::function<void(const double*, double*)> field()
6760

6861
void ALICE3Field()
6962
{
63+
gStyle->SetPalette(kRainBow);
64+
gStyle->SetNumberContours(255);
65+
7066
auto fieldFunc = field();
7167
// RZ plane visualization
72-
TCanvas* cRZ = new TCanvas("cRZ", "Field in RZ plane", 800, 600);
73-
TH2F* hRZ = new TH2F("hRZ", "Magnetic Field B_z in RZ plane;Z [m];R [m]", 100, -10, 10, 100, -5, 5);
68+
TCanvas* cRZ = new TCanvas("cRZ", "Field in RZ plane", 800, 800);
69+
gPad->SetRightMargin(0.15);
70+
TH2F* hRZ = new TH2F("hRZ", "Magnetic Field B_z in RZ plane;Z [m];R [m];B_{z} [kGauss]", 100, -10, 10, 100, -5, 5);
7471
hRZ->SetBit(TH1::kNoStats); // disable stats box
7572
for (int i = 1; i <= hRZ->GetNbinsX(); i++) {
7673
const double Z = hRZ->GetXaxis()->GetBinCenter(i);
@@ -83,12 +80,14 @@ void ALICE3Field()
8380
}
8481
}
8582

83+
hRZ->GetZaxis()->SetRangeUser(-30, 30);
8684
hRZ->Draw("COLZ");
8785
cRZ->Update();
8886

8987
// XY plane visualization
90-
TCanvas* cXY = new TCanvas("cXY", "Field in XY plane", 800, 600);
91-
TH2F* hXY = new TH2F("hXY", "Magnetic Field B_z in XY plane;X [m];Y [m]", 100, -5, 5, 100, -5, 5);
88+
TCanvas* cXY = new TCanvas("cXY", "Field in XY plane", 800, 800);
89+
gPad->SetRightMargin(0.15);
90+
TH2F* hXY = new TH2F("hXY", "Magnetic Field B_z in XY plane;X [m];Y [m];B_{z} [kGauss]", 100, -5, 5, 100, -5, 5);
9291
hXY->SetBit(TH1::kNoStats); // disable stats box
9392

9493
for (int i = 1; i <= hXY->GetNbinsX(); i++) {
@@ -102,6 +101,7 @@ void ALICE3Field()
102101
}
103102
}
104103

104+
hXY->GetZaxis()->SetRangeUser(-30, 30);
105105
hXY->Draw("COLZ");
106106
cXY->Update();
107-
}
107+
}

‎Detectors/Upgrades/ALICE3/macros/ALICE3FieldShortMagnet.C‎

Lines changed: 30 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -11,18 +11,27 @@
1111
//
1212
// Author: J. E. Munoz Mendez jesus.munoz@cern.ch
1313

14+
#include <functional>
15+
#include <cmath>
16+
#include <TCanvas.h>
17+
#include <TH2F.h>
18+
#include <TStyle.h>
19+
1420
std::function<void(const double*, double*)> field()
1521
{
1622
return [](const double* x, double* b) {
17-
const double Rc = 185.; //[cm]
18-
const double R1 = 220.; //[cm]
19-
const double R2 = 290.; //[cm]
20-
const double B1 = 2.; //[T]
21-
const double B2 = -Rc * Rc / ((R2 * R2 - R1 * R1) * B1); //[T]
22-
const double beamStart = 370.; //[cm]
23-
const double tokGauss = 1. / 0.1; // conversion from Tesla to kGauss
23+
// RADIUS
24+
static constexpr double Rc = 170.; // [cm] — R_out_coil per Ian DetectorConstruction.cc; confirmed by A. Ortiz definition
25+
static constexpr double R1 = 220.; // [cm]
26+
static constexpr double R2 = 290.; // [cm]
27+
28+
// FIELD
29+
static constexpr double B1 = 2.; // [T]
30+
static constexpr double B2 = -B1 * Rc * Rc / (R2 * R2 - R1 * R1); // [T] — B1 in numerator, confirmed by A. Ortiz Aug 2026
31+
static constexpr double beamStart = 370.; // [cm]
32+
static constexpr double tokGauss = 1. / 0.1; // conversion from Tesla to kGauss
2433

25-
const bool isMagAbs = true;
34+
static constexpr bool isMagAbs = true;
2635

2736
const double r = sqrt(x[0] * x[0] + x[1] * x[1]);
2837
if ((abs(x[2]) <= beamStart) && (r < Rc)) { // We are inside of the central region
@@ -49,12 +58,16 @@ std::function<void(const double*, double*)> field()
4958
};
5059
}
5160

52-
void ALICE3V3Magnet()
61+
void ALICE3FieldShortMagnet()
5362
{
63+
gStyle->SetPalette(kRainBow);
64+
gStyle->SetNumberContours(255);
65+
5466
auto fieldFunc = field();
5567
// RZ plane visualization
56-
TCanvas* cRZ = new TCanvas("cRZ", "Field in RZ plane", 800, 600);
57-
TH2F* hRZ = new TH2F("hRZ", "Magnetic Field B_z in RZ plane;Z [m];R [m]", 100, -10, 10, 100, -5, 5);
68+
TCanvas* cRZ = new TCanvas("cRZ", "Field in RZ plane", 800, 800);
69+
gPad->SetRightMargin(0.15);
70+
TH2F* hRZ = new TH2F("hRZ", "Magnetic Field B_z in RZ plane;Z [m];R [m];B_{z} [kGauss]", 100, -10, 10, 100, -5, 5);
5871
hRZ->SetBit(TH1::kNoStats); // disable stats box
5972
for (int i = 1; i <= hRZ->GetNbinsX(); i++) {
6073
const double Z = hRZ->GetXaxis()->GetBinCenter(i);
@@ -67,12 +80,14 @@ void ALICE3V3Magnet()
6780
}
6881
}
6982

83+
hRZ->GetZaxis()->SetRangeUser(-30, 30);
7084
hRZ->Draw("COLZ");
7185
cRZ->Update();
7286

7387
// XY plane visualization
74-
TCanvas* cXY = new TCanvas("cXY", "Field in XY plane", 800, 600);
75-
TH2F* hXY = new TH2F("hXY", "Magnetic Field B_z in XY plane;X [m];Y [m]", 100, -5, 5, 100, -5, 5);
88+
TCanvas* cXY = new TCanvas("cXY", "Field in XY plane", 800, 800);
89+
gPad->SetRightMargin(0.15);
90+
TH2F* hXY = new TH2F("hXY", "Magnetic Field B_z in XY plane;X [m];Y [m];B_{z} [kGauss]", 100, -5, 5, 100, -5, 5);
7691
hXY->SetBit(TH1::kNoStats); // disable stats box
7792

7893
for (int i = 1; i <= hXY->GetNbinsX(); i++) {
@@ -86,6 +101,7 @@ void ALICE3V3Magnet()
86101
}
87102
}
88103

104+
hXY->GetZaxis()->SetRangeUser(-30, 30);
89105
hXY->Draw("COLZ");
90106
cXY->Update();
91-
}
107+
}

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