TimingDetectorFactory.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright (C) CERN for the benefit of the SHiP Collaboration
 
#pragma once
 
#include <GeoModelKernel/Units.h>
 
class GeoPhysVol;
 
namespace SHiPGeometry {
 
class SHiPMaterials;
 
class TimingDetectorFactory {
   public:
    explicit TimingDetectorFactory(SHiPMaterials& materials);
    ~TimingDetectorFactory() = default;
 
    [[nodiscard]] GeoPhysVol* build();
 
    int barCount() const { return m_barCount; }
 
   private:
    SHiPMaterials& m_materials;
    int m_barCount{0};
 
    // Container dimensions
    static constexpr double s_containerHalfX = 2750.0 * GeoModelKernelUnits::mm;
    static constexpr double s_containerHalfY = 3250.0 * GeoModelKernelUnits::mm;
    static constexpr double s_containerHalfZ = 250.0 * GeoModelKernelUnits::mm;
 
    // Bar dimensions
    static constexpr double s_barHalfX = 700.0 * GeoModelKernelUnits::mm;  // 140 cm full length
    static constexpr double s_barHalfY = 30.0 * GeoModelKernelUnits::mm;   //   6 cm full width
    static constexpr double s_barHalfZ = 5.0 * GeoModelKernelUnits::mm;    //   1 cm full thickness
 
    // Bar grid layout
    static constexpr int s_nColumns = 3;
    static constexpr int s_nRows = 110;
    static constexpr double s_columnPitchX =
        1300.0 * GeoModelKernelUnits::mm;                                 // column spacing in X
    static constexpr double s_rowY0 = -3220.0 * GeoModelKernelUnits::mm;  // first-row Y
    static constexpr double s_rowStepY =
        6440.0 / 109.0 * GeoModelKernelUnits::mm;  // row pitch ≈ 59.083 mm
    static constexpr double s_zStaggerRow = 12.0 * GeoModelKernelUnits::mm;  // odd-row Z offset
    static constexpr double s_zStaggerCol = 90.0 * GeoModelKernelUnits::mm;  // odd-column Z offset
};
 
}  // namespace SHiPGeometry