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Geometry implementation variants introduced
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| // This file is part of the Acts project. | ||
| // | ||
| // Copyright (C) 2020-2021 CERN for the benefit of the Acts project | ||
| // | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
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| #include "BuildMtpcDetector.hpp" | ||
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| #include <Acts/Definitions/Algebra.hpp> | ||
| #include <Acts/Definitions/Units.hpp> | ||
| #include <Acts/Geometry/CylinderLayer.hpp> | ||
| #include <Acts/Geometry/CylinderVolumeBounds.hpp> | ||
| #include <Acts/Geometry/GeometryContext.hpp> | ||
| #include <Acts/Geometry/ILayerArrayCreator.hpp> | ||
| #include <Acts/Geometry/LayerArrayCreator.hpp> | ||
| #include <Acts/Geometry/TrackingGeometry.hpp> | ||
| #include <Acts/Geometry/TrackingVolume.hpp> | ||
| #include <Acts/Material/HomogeneousVolumeMaterial.hpp> | ||
| #include <Acts/Material/Material.hpp> | ||
| #include <Acts/Material/MaterialSlab.hpp> | ||
| #include <Acts/Surfaces/SurfaceArray.hpp> | ||
| #include <Acts/Utilities/BinningType.hpp> | ||
| #include <Acts/Utilities/Logger.hpp> | ||
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| #include <memory> | ||
| #include <vector> | ||
| #include <unordered_map> | ||
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| #include "MtpcDetectorElement.hpp" | ||
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| namespace tdis { | ||
| namespace tracking { | ||
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| /** This geometry uses cylindrical surfaces with: | ||
| * - R (radius) of each cylinder - corresponding to each mTPC ring center | ||
| * - The length of each cylinder in Z direction equal to the entire detector length (55 cm) | ||
| * Then each cylinder corresponds to an MtpcDetectorElement in the detector store. | ||
| */ | ||
| std::unique_ptr<const Acts::TrackingGeometry> | ||
| buildCylindricalDetector( | ||
| const MtpcDetectorElement::ContextType& gctx, | ||
| std::unordered_map<uint32_t, std::shared_ptr<MtpcDetectorElement>>& surfaceStore) | ||
| { | ||
| using namespace Acts; | ||
| using namespace Acts::UnitLiterals; | ||
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| // Define Argon gas material properties at STP | ||
| double radiationLength = 19.55_m; // ~ 19.55 m in mm | ||
| double interactionLength = 70.0_m; // ~ 70.0 m in mm | ||
| double atomicMass = 39.948; // Argon | ||
| double atomicNumber = 18; // Argon | ||
| double massDensity = 1.66e-6_g / 1_mm3; // g/mm^3 | ||
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| // Create Argon gas material | ||
| Material argonGas = Material::fromMassDensity( | ||
| radiationLength, interactionLength, atomicMass, atomicNumber, massDensity); | ||
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| // Geometry parameters | ||
| double innerRadius = 50_mm; // 5 cm | ||
| double outerRadius = 150_mm; // 15 cm | ||
| double cylinderLength = 550_mm; // 55 cm | ||
| double halfLength = cylinderLength / 2.0; | ||
| int numRings = 21; // 21 concentric rings | ||
| double radialStep = (outerRadius - innerRadius) / numRings; | ||
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| // We store the final layers as generic Layer pointers | ||
| std::vector<std::shared_ptr<const Layer>> cylinderLayers; | ||
| cylinderLayers.reserve(numRings); | ||
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| for (int i = 0; i < numRings; ++i) { | ||
| // Calculate the radius of the current ring | ||
| double radius = innerRadius + (i + 0.5) * radialStep; | ||
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| // Cylinder bounds | ||
| auto cylinderBounds = | ||
| std::make_shared<const CylinderBounds>(radius, halfLength); | ||
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| // Unique ID for the ring | ||
| uint32_t id = static_cast<uint32_t>(i); | ||
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| // Identity transform for the element | ||
| auto elementTransform = std::make_shared<const Transform3>(Transform3::Identity()); | ||
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| // Create the MtpcDetectorElement | ||
| auto detElem = std::make_shared<MtpcDetectorElement>( | ||
| id, | ||
| elementTransform, | ||
| cylinderBounds, | ||
| radialStep // thickness | ||
| ); | ||
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| // Store it for later reference | ||
| surfaceStore[id] = detElem; | ||
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| // Extract the cylinder surface | ||
| auto cylinderSurface = detElem->surface().getSharedPtr(); | ||
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| // Create a single-surface SurfaceArray | ||
| // SurfaceArray offers a constructor that takes one Surface | ||
| auto surfaceArray = std::make_unique<SurfaceArray>(cylinderSurface); | ||
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| // Create a CylinderLayer | ||
| auto cylinderLayer = CylinderLayer::create( | ||
| Transform3::Identity(), // transform | ||
| cylinderBounds, // cylinder bounds | ||
| std::move(surfaceArray), // single-surface array | ||
| radialStep, // layer thickness | ||
| nullptr, // no approach descriptor | ||
| LayerType::active // the layer is active | ||
| ); | ||
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| cylinderLayers.push_back(std::move(cylinderLayer)); | ||
| } | ||
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| // Create a layer array from the cylinder layers | ||
| LayerArrayCreator::Config layerArrayCreatorConfig; | ||
| LayerArrayCreator layerArrayCreator(layerArrayCreatorConfig); | ||
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| auto layerArray = layerArrayCreator.layerArray( | ||
| GeometryContext(), // geometry context | ||
| cylinderLayers, // vector of shared_ptr<const Layer> | ||
| innerRadius, // min radius | ||
| outerRadius, // max radius | ||
| BinningType::arbitrary, | ||
| BinningValue::binR); | ||
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| // Volume bounds (outermost dimensions) | ||
| auto volumeBounds = std::make_shared<CylinderVolumeBounds>( | ||
| innerRadius, outerRadius, halfLength); | ||
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| // Assign volume material | ||
| auto volumeMaterial = std::make_shared<HomogeneousVolumeMaterial>(argonGas); | ||
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| // Create the tracking volume | ||
| auto trackingVolume = std::make_shared<TrackingVolume>( | ||
| Transform3::Identity(), // center at origin | ||
| volumeBounds, // shape/bounds | ||
| volumeMaterial, // Argon fill | ||
| std::move(layerArray), // cylinder layers | ||
| nullptr, // no contained volumes | ||
| MutableTrackingVolumeVector{}, | ||
| "TPCVolume"); | ||
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| // Finally, create the TrackingGeometry with this single volume as world | ||
| auto trackingGeometry = std::make_unique<TrackingGeometry>(trackingVolume); | ||
| return trackingGeometry; | ||
| } | ||
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| } // namespace tracking | ||
| } // namespace tdis |
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