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Fix geometry building of FT3 #14968

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Fix geometry building of FT3 #14968

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53a5970
Fix geometry building of FT3
njacazio Jan 16, 2026
64ddb8f
Fix density value for FT3_Kapton material
njacazio Jan 16, 2026
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53 changes: 30 additions & 23 deletions Detectors/Upgrades/ALICE3/FT3/simulation/src/FT3Module.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
#include <TGeoMedium.h>
#include <TGeoBBox.h>
#include <TGeoMatrix.h>
#include <Framework/Logger.h>
#include <cmath>
#include <iostream>
#include <vector>
Expand All @@ -41,12 +42,12 @@ TGeoMedium* FT3Module::AluminumMed = nullptr;

void FT3Module::initialize_materials()
{

LOG(debug) << "FT3Module: initialize_materials";
if (siliconMat) {
return;
}

TGeoManager* gGeoManager = gGeoManager;
TGeoManager* geoManager = gGeoManager;

auto* itsH = new TGeoElement("FT3_H", "Hydrogen", 1, 1.00794);
auto* itsC = new TGeoElement("FT3_C", "Carbon", 6, 12.0107);
Expand All @@ -73,6 +74,7 @@ void FT3Module::initialize_materials()

AluminumMat = new TGeoMaterial("Aluminum", 26.98, 13, 2.7);
AluminumMed = new TGeoMedium("Aluminum", 5, AluminumMat);
LOG(debug) << "FT3Module: done initialize_materials";
}

double calculate_y_circle(double x, double radius)
Expand All @@ -83,7 +85,8 @@ double calculate_y_circle(double x, double radius)
void FT3Module::create_layout(double mZ, int layerNumber, int direction, double Rin, double Rout, double overlap, const std::string& face, const std::string& layout_type, TGeoVolume* motherVolume)
{

TGeoManager* gGeoManager = gGeoManager;
LOG(debug) << "FT3Module: create_layout - Layer " << layerNumber << ", Direction " << direction << ", Face " << face;
TGeoManager* geoManager = gGeoManager;

FT3Module::initialize_materials();

Expand Down Expand Up @@ -479,70 +482,70 @@ void FT3Module::create_layout(double mZ, int layerNumber, int direction, double
if (sensor_width == 2.5) {
// silicon
std::string sensor_name = "FT3sensor_front_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(sensor_name.c_str(), siliconMed, active_width / 2, active_height / 2, silicon_thickness / 2);
sensor = geoManager->MakeBox(sensor_name.c_str(), siliconMed, active_width / 2, active_height / 2, silicon_thickness / 2);
sensor->SetLineColor(SiColor);
sensor->SetFillColorAlpha(SiColor, 0.4);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(active_x_shift_sensor + x_offset, y + y_offset, mZ + z_offset - epoxy_thickness - kapton_thickness - copper_thickness - epoxy_thickness - silicon_thickness / 2));

std::string inactive_name = "FT3inactive_front_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(inactive_name.c_str(), siliconMed, (sensor_width - active_width) / 2, sensor_height / 2, silicon_thickness / 2);
sensor = geoManager->MakeBox(inactive_name.c_str(), siliconMed, (sensor_width - active_width) / 2, sensor_height / 2, silicon_thickness / 2);
sensor->SetLineColor(kRed);
sensor->SetFillColorAlpha(kRed, 1.0);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + inactive_x_shift, y + y_offset, mZ + z_offset - epoxy_thickness - kapton_thickness - copper_thickness - epoxy_thickness - silicon_thickness / 2));

} else {

std::string sensor_name = "FT3sensor_front_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(sensor_name.c_str(), siliconMed, active_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor = geoManager->MakeBox(sensor_name.c_str(), siliconMed, active_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor->SetLineColor(SiColor);
sensor->SetFillColorAlpha(SiColor, 0.4);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + x + inactive_width / 2, y + y_offset, mZ + z_offset - epoxy_thickness - kapton_thickness - copper_thickness - epoxy_thickness - silicon_thickness / 2));

std::string inactive_name_left = "FT3inactive_left_front_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(inactive_name_left.c_str(), siliconMed, inactive_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor = geoManager->MakeBox(inactive_name_left.c_str(), siliconMed, inactive_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor->SetLineColor(kRed);
sensor->SetFillColorAlpha(kRed, 1.0);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + inactive_x_shift_left, y + y_offset, mZ + z_offset - epoxy_thickness - kapton_thickness - copper_thickness - epoxy_thickness - silicon_thickness / 2));

std::string inactive_name_right = "FT3inactive_right_front_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(inactive_name_right.c_str(), siliconMed, inactive_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor = geoManager->MakeBox(inactive_name_right.c_str(), siliconMed, inactive_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor->SetLineColor(kRed);
sensor->SetFillColorAlpha(kRed, 1.0);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + inactive_x_shift_right, y + y_offset, mZ + z_offset - epoxy_thickness - kapton_thickness - copper_thickness - epoxy_thickness - silicon_thickness / 2));
}

// silicon-to-FPC epoxy glue
std::string glue_up_name = "FT3glue_up_front_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(glue_up_name.c_str(), epoxyMed, sensor_width / 2, sensor_height / 2, epoxy_thickness / 2);
sensor = geoManager->MakeBox(glue_up_name.c_str(), epoxyMed, sensor_width / 2, sensor_height / 2, epoxy_thickness / 2);
sensor->SetLineColor(kBlue);
sensor->SetFillColorAlpha(kBlue, 1.0);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + active_x_shift, y + y_offset, mZ + z_offset - epoxy_thickness - kapton_thickness - copper_thickness - epoxy_thickness / 2));

if (r_squared < R_material_threshold * R_material_threshold) {
std::string alu_name = "FT3aluminum_front_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(alu_name.c_str(), AluminumMed, sensor_width / 2, sensor_height / 2, copper_thickness / 2);
sensor = geoManager->MakeBox(alu_name.c_str(), AluminumMed, sensor_width / 2, sensor_height / 2, copper_thickness / 2);
sensor->SetLineColor(kBlack);
sensor->SetFillColorAlpha(kBlack, 0.4);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(active_x_shift + x_offset, y + y_offset, mZ + z_offset - epoxy_thickness - kapton_thickness - copper_thickness / 2));

} else {
std::string copper_name = "FT3copper_front_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(copper_name.c_str(), copperMed, sensor_width / 2, sensor_height / 2, copper_thickness / 2);
sensor = geoManager->MakeBox(copper_name.c_str(), copperMed, sensor_width / 2, sensor_height / 2, copper_thickness / 2);
sensor->SetLineColor(kBlack);
sensor->SetFillColorAlpha(kBlack, 0.4);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(active_x_shift + x_offset, y + y_offset, mZ + z_offset - epoxy_thickness - kapton_thickness - copper_thickness / 2));
}

// kapton
std::string fpc_name = "FT3fpc_front_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(fpc_name.c_str(), kaptonMed, sensor_width / 2, sensor_height / 2, kapton_thickness / 2);
sensor = geoManager->MakeBox(fpc_name.c_str(), kaptonMed, sensor_width / 2, sensor_height / 2, kapton_thickness / 2);
sensor->SetLineColor(kGreen);
sensor->SetFillColorAlpha(kGreen, 0.4);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(active_x_shift + x_offset, y + y_offset, mZ + z_offset - epoxy_thickness - kapton_thickness / 2));

// FPC-to-support epoxy glue
std::string glue_down_name = "FT3glue_down_front_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(glue_down_name.c_str(), epoxyMed, sensor_width / 2, sensor_height / 2, epoxy_thickness / 2);
sensor = geoManager->MakeBox(glue_down_name.c_str(), epoxyMed, sensor_width / 2, sensor_height / 2, epoxy_thickness / 2);
sensor->SetLineColor(kBlue);
sensor->SetFillColorAlpha(kBlue, 1.0);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + active_x_shift, y + y_offset, mZ + z_offset - epoxy_thickness / 2));
Expand Down Expand Up @@ -612,73 +615,73 @@ void FT3Module::create_layout(double mZ, int layerNumber, int direction, double

// FPC-to-support epoxy glue
std::string glue_down_name = "FT3glue_down_back_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(glue_down_name.c_str(), epoxyMed, sensor_width / 2, sensor_height / 2, epoxy_thickness / 2);
sensor = geoManager->MakeBox(glue_down_name.c_str(), epoxyMed, sensor_width / 2, sensor_height / 2, epoxy_thickness / 2);
sensor->SetLineColor(kBlue);
sensor->SetFillColorAlpha(kBlue, 1.0);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + active_x_shift, y + y_offset, mZ + z_offset + epoxy_thickness / 2));

// Kapton
std::string fpc_name = "FT3fpc_back_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(fpc_name.c_str(), kaptonMed, sensor_width / 2, sensor_height / 2, kapton_thickness / 2);
sensor = geoManager->MakeBox(fpc_name.c_str(), kaptonMed, sensor_width / 2, sensor_height / 2, kapton_thickness / 2);
sensor->SetLineColor(kGreen);
sensor->SetFillColorAlpha(kGreen, 0.4);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(active_x_shift + x_offset, y + y_offset, mZ + z_offset + epoxy_thickness + kapton_thickness / 2));

if (r_squared < R_material_threshold * R_material_threshold) {
// replace copper with alu
std::string alu_name = "FT3aluminum_back_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(alu_name.c_str(), AluminumMed, sensor_width / 2, sensor_height / 2, copper_thickness / 2);
sensor = geoManager->MakeBox(alu_name.c_str(), AluminumMed, sensor_width / 2, sensor_height / 2, copper_thickness / 2);
sensor->SetLineColor(kBlack);
sensor->SetFillColorAlpha(kBlack, 0.4);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(active_x_shift + x_offset, y + y_offset, mZ + z_offset + epoxy_thickness + kapton_thickness + copper_thickness / 2));

} else {
std::string copper_name = "FT3copper_back_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(copper_name.c_str(), copperMed, sensor_width / 2, sensor_height / 2, copper_thickness / 2);
sensor = geoManager->MakeBox(copper_name.c_str(), copperMed, sensor_width / 2, sensor_height / 2, copper_thickness / 2);
sensor->SetLineColor(kBlack);
sensor->SetFillColorAlpha(kBlack, 0.4);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(active_x_shift + x_offset, y + y_offset, mZ + z_offset + epoxy_thickness + kapton_thickness + copper_thickness / 2));
}

// silicon-to-FPC epoxy glue
std::string glue_up_name = "FT3glue_up_back_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(glue_up_name.c_str(), epoxyMed, sensor_width / 2, sensor_height / 2, epoxy_thickness / 2);
sensor = geoManager->MakeBox(glue_up_name.c_str(), epoxyMed, sensor_width / 2, sensor_height / 2, epoxy_thickness / 2);
sensor->SetLineColor(kBlue);
sensor->SetFillColorAlpha(kBlue, 1.0);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + active_x_shift, y + y_offset, mZ + z_offset + epoxy_thickness + kapton_thickness + copper_thickness + epoxy_thickness / 2));

if (sensor_width == 2.5) {

std::string sensor_name = "FT3sensor_back_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(sensor_name.c_str(), siliconMed, active_width / 2, active_height / 2, silicon_thickness / 2);
sensor = geoManager->MakeBox(sensor_name.c_str(), siliconMed, active_width / 2, active_height / 2, silicon_thickness / 2);
sensor->SetLineColor(SiColor);
sensor->SetFillColorAlpha(SiColor, 0.4);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(active_x_shift_sensor + x_offset, y + y_offset, mZ + z_offset + epoxy_thickness + kapton_thickness + copper_thickness + epoxy_thickness + silicon_thickness / 2));

std::string inactive_name = "FT3inactive_back_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(inactive_name.c_str(), siliconMed, (sensor_width - active_width) / 2, sensor_height / 2, silicon_thickness / 2);
sensor = geoManager->MakeBox(inactive_name.c_str(), siliconMed, (sensor_width - active_width) / 2, sensor_height / 2, silicon_thickness / 2);
sensor->SetLineColor(kRed);
sensor->SetFillColorAlpha(kRed, 1.0);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + inactive_x_shift, y + y_offset, mZ + z_offset + epoxy_thickness + kapton_thickness + copper_thickness + epoxy_thickness + silicon_thickness / 2));

} else {
// active (4.6 cm centered)
std::string sensor_name = "FT3sensor_back_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(sensor_name.c_str(), siliconMed, active_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor = geoManager->MakeBox(sensor_name.c_str(), siliconMed, active_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor->SetLineColor(SiColor);
sensor->SetFillColorAlpha(SiColor, 0.4);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + x_shifted + inactive_width / 2, y + y_offset, mZ + z_offset + epoxy_thickness + kapton_thickness + copper_thickness + epoxy_thickness + silicon_thickness / 2));

// left inactive strip
std::string inactive_name_left = "FT3inactive_left_back_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(inactive_name_left.c_str(), siliconMed, inactive_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor = geoManager->MakeBox(inactive_name_left.c_str(), siliconMed, inactive_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor->SetLineColor(kRed);
sensor->SetFillColorAlpha(kRed, 1.0);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + inactive_x_shift_left, y + y_offset, mZ + z_offset + epoxy_thickness + kapton_thickness + copper_thickness + epoxy_thickness + silicon_thickness / 2));

// right inactive strip
std::string inactive_name_right = "FT3inactive_right_back_" + std::to_string(layerNumber) + "_" + std::to_string(direction) + "_" + std::to_string(sensor_count);
sensor = gGeoManager->MakeBox(inactive_name_right.c_str(), siliconMed, inactive_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor = geoManager->MakeBox(inactive_name_right.c_str(), siliconMed, inactive_width / 2, sensor_height / 2, silicon_thickness / 2);
sensor->SetLineColor(kRed);
sensor->SetFillColorAlpha(kRed, 1.0);
motherVolume->AddNode(sensor, sensor_count++, new TGeoTranslation(x_offset + inactive_x_shift_right, y + y_offset, mZ + z_offset + epoxy_thickness + kapton_thickness + copper_thickness + epoxy_thickness + silicon_thickness / 2));
Expand All @@ -691,9 +694,13 @@ void FT3Module::create_layout(double mZ, int layerNumber, int direction, double
rowCounter++;
}
}
LOG(debug) << "FT3Module: done create_layout";
}

void FT3Module::createModule(double mZ, int layerNumber, int direction, double Rin, double Rout, double overlap, const std::string& face, const std::string& layout_type, TGeoVolume* motherVolume)
{

LOG(debug) << "FT3Module: createModule - Layer " << layerNumber << ", Direction " << direction << ", Face " << face;
create_layout(mZ, layerNumber, direction, Rin, Rout, overlap, face, layout_type, motherVolume);
LOG(debug) << "FT3Module: done createModule";
}