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A3: Add customization of detector MID/Magnet/Absorber radius #14621

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Merged
njacazio merged 2 commits into from
Aug 27, 2025
Merged

A3: Add customization of detector MID/Magnet/Absorber radius #14621

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c7052a6
Add customization of radius
njacazio Aug 25, 2025
fff7359
Please consider the following formatting changes (#34)
alibuild Aug 25, 2025
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12 changes: 12 additions & 0 deletions Detectors/Upgrades/ALICE3/MID/base/include/MI3Base/MI3BaseParam.h
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,19 @@ namespace o2
{
namespace mi3
{

// **
// ** Parameters for MID base configuration
// **

enum MIDLayout : int {
StandardRadius = 0,
ReducedRadius = 1
};

struct MIDBaseParam : public o2::conf::ConfigurableParamHelper<MIDBaseParam> {
int mLayout = MIDLayout::StandardRadius;

O2ParamDef(MIDBaseParam, "MIDBase");
};

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12 changes: 10 additions & 2 deletions Detectors/Upgrades/ALICE3/MID/simulation/src/Detector.cxx
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Expand Up @@ -126,8 +126,16 @@ void Detector::createGeometry()

// Build the MID
mLayers.resize(2);
mLayers[0] = MIDLayer(0, GeometryTGeo::composeSymNameLayer(0), 301.f, 500.f);
mLayers[1] = MIDLayer(1, GeometryTGeo::composeSymNameLayer(1), 311.f, 520.f); // arbitrarily reduced to get multiple of 5.2f
auto& midParam = MIDBaseParam::Instance();
const bool standardRadius = (midParam.mLayout == o2::mi3::MIDLayout::StandardRadius);

if (standardRadius) {
mLayers[0] = MIDLayer(0, GeometryTGeo::composeSymNameLayer(0), 301.f, 500.f);
mLayers[1] = MIDLayer(1, GeometryTGeo::composeSymNameLayer(1), 311.f, 520.f); // arbitrarily reduced to get multiple of 5.2f
} else {
mLayers[0] = MIDLayer(0, GeometryTGeo::composeSymNameLayer(0), 266.f, 500.f);
mLayers[1] = MIDLayer(1, GeometryTGeo::composeSymNameLayer(1), 276.f, 520.f);
}

for (auto& layer : mLayers) {
layer.createLayer(vMID);
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6 changes: 6 additions & 0 deletions Detectors/Upgrades/ALICE3/Passive/include/Alice3DetectorsPassive/PassiveBaseParam.h
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Expand Up @@ -29,10 +29,16 @@ enum MagnetLayout : int {
CopperStabilizer = 1
};

enum DetLayout : int {
StandardRadius = 0,
ReducedRadius = 1
};

struct Alice3PassiveBaseParam : public o2::conf::ConfigurableParamHelper<Alice3PassiveBaseParam> {
// Geometry Builder parameters

int mLayout = MagnetLayout::AluminiumStabilizer;
int mDetLayout = DetLayout::StandardRadius;

O2ParamDef(Alice3PassiveBaseParam, "Alice3PassiveBase");
};
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66 changes: 47 additions & 19 deletions Detectors/Upgrades/ALICE3/Passive/src/Absorber.cxx
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Expand Up @@ -12,6 +12,7 @@
#include <DetectorsBase/Detector.h>
#include <DetectorsBase/MaterialManager.h>
#include <Alice3DetectorsPassive/Absorber.h>
#include <Alice3DetectorsPassive/PassiveBaseParam.h>
#include <TGeoArb8.h> // for TGeoTrap
#include <TGeoCompositeShape.h>
#include <TGeoCone.h>
Expand Down Expand Up @@ -130,25 +131,52 @@ void Alice3Absorber::ConstructGeometry()
}

TGeoPcon* absorings = new TGeoPcon(0., 360., 18);

absorings->DefineSection(0, 500, 236, 274);
absorings->DefineSection(1, 400, 236, 274);
absorings->DefineSection(2, 400, 232.5, 277.5);
absorings->DefineSection(3, 300, 232.5, 277.5);
absorings->DefineSection(4, 300, 227.5, 282.5);
absorings->DefineSection(5, 200, 227.5, 282.5);
absorings->DefineSection(6, 200, 222.5, 287.5);
absorings->DefineSection(7, 100, 222.5, 287.5);
absorings->DefineSection(8, 100, 220, 290);
absorings->DefineSection(9, -100, 220, 290);
absorings->DefineSection(10, -100, 222.5, 287.5);
absorings->DefineSection(11, -200, 222.5, 287.5);
absorings->DefineSection(12, -200, 227.5, 282.5);
absorings->DefineSection(13, -300, 227.5, 282.5);
absorings->DefineSection(14, -300, 232.5, 277.5);
absorings->DefineSection(15, -400, 232.5, 277.5);
absorings->DefineSection(16, -400, 236, 274);
absorings->DefineSection(17, -500, 236, 274);
auto& passiveBaseParam = Alice3PassiveBaseParam::Instance();
switch (passiveBaseParam.mDetLayout) {
case o2::passive::DetLayout::StandardRadius:
absorings->DefineSection(0, 500, 236, 274);
absorings->DefineSection(1, 400, 236, 274);
absorings->DefineSection(2, 400, 232.5, 277.5);
absorings->DefineSection(3, 300, 232.5, 277.5);
absorings->DefineSection(4, 300, 227.5, 282.5);
absorings->DefineSection(5, 200, 227.5, 282.5);
absorings->DefineSection(6, 200, 222.5, 287.5);
absorings->DefineSection(7, 100, 222.5, 287.5);
absorings->DefineSection(8, 100, 220, 290);
absorings->DefineSection(9, -100, 220, 290);
absorings->DefineSection(10, -100, 222.5, 287.5);
absorings->DefineSection(11, -200, 222.5, 287.5);
absorings->DefineSection(12, -200, 227.5, 282.5);
absorings->DefineSection(13, -300, 227.5, 282.5);
absorings->DefineSection(14, -300, 232.5, 277.5);
absorings->DefineSection(15, -400, 232.5, 277.5);
absorings->DefineSection(16, -400, 236, 274);
absorings->DefineSection(17, -500, 236, 274);
break;
case o2::passive::DetLayout::ReducedRadius:
absorings->DefineSection(0, 500, 201, 239);
absorings->DefineSection(1, 400, 201, 239);
absorings->DefineSection(2, 400, 197.5, 242.5);
absorings->DefineSection(3, 300, 197.5, 242.5);
absorings->DefineSection(4, 300, 192.5, 247.5);
absorings->DefineSection(5, 200, 192.5, 247.5);
absorings->DefineSection(6, 200, 187.5, 252.5);
absorings->DefineSection(7, 100, 187.5, 252.5);
absorings->DefineSection(8, 100, 185, 255);
absorings->DefineSection(9, -100, 185, 255);
absorings->DefineSection(10, -100, 187.5, 252.5);
absorings->DefineSection(11, -200, 187.5, 252.5);
absorings->DefineSection(12, -200, 192.5, 247.5);
absorings->DefineSection(13, -300, 192.5, 247.5);
absorings->DefineSection(14, -300, 197.5, 242.5);
absorings->DefineSection(15, -400, 197.5, 242.5);
absorings->DefineSection(16, -400, 201, 239);
absorings->DefineSection(17, -500, 201, 239);
break;
default:
LOG(fatal) << "Unknown detector layout " << passiveBaseParam.mDetLayout;
break;
}

// Insert
absorings->SetName("absorings");
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40 changes: 35 additions & 5 deletions Detectors/Upgrades/ALICE3/Passive/src/Magnet.cxx
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Expand Up @@ -106,11 +106,41 @@ void Alice3Magnet::ConstructGeometry()

// Passive Base configuration parameters
auto& passiveBaseParam = Alice3PassiveBaseParam::Instance();
const bool doCopperStabilizer = (passiveBaseParam.mLayout == o2::passive::MagnetLayout::CopperStabilizer);
if (doCopperStabilizer) {
mRestMaterialThickness -= 3.3; // cm Remove the Aluminium stabiliser
mRestMaterialThickness += 2.2; // cm Add the Copper stabiliser
LOG(debug) << "Alice 3 magnet: using Copper Stabilizer with thickness " << mRestMaterialThickness << " cm";

switch (passiveBaseParam.mDetLayout) {
case o2::passive::DetLayout::StandardRadius:
// Defined in the header file
break;
case o2::passive::DetLayout::ReducedRadius:
mInnerWrapInnerRadius = 125.f; // cm
mInnerWrapThickness = 1.f; // cm
mCoilInnerRadius = 145.f; // cm
mCoilThickness = 0.3f; // cm
mRestMaterialRadius = 145.3f; // cm
mRestMaterialThickness = 6.8f; // cm
mOuterWrapInnerRadius = 165.f; // cm
mOuterWrapThickness = 3.f; // cm
mZLength = 800.f; // cm
break;
default:
LOG(fatal) << "Unknown detector layout " << passiveBaseParam.mDetLayout;
break;
}

bool doCopperStabilizer = false;
switch (passiveBaseParam.mLayout) {
case o2::passive::MagnetLayout::AluminiumStabilizer:
// Handled in the header file
break;
case o2::passive::MagnetLayout::CopperStabilizer:
doCopperStabilizer = true;
mRestMaterialThickness -= 3.3; // cm Remove the Aluminium stabiliser
mRestMaterialThickness += 2.2; // cm Add the Copper stabiliser
LOG(debug) << "Alice 3 magnet: using Copper Stabilizer with thickness " << mRestMaterialThickness << " cm";
break;
default:
LOG(fatal) << "Unknown magnet layout " << passiveBaseParam.mLayout;
break;
}

TGeoManager* geoManager = gGeoManager;
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