SBTConfig.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 <string>
 
namespace SHiPGeometry {
 
struct SBTConfig {
    // ── Frustum envelope ────────────────────────────────────────────────
    double x_half_entrance_mm = 1000.0;
    double y_half_entrance_mm = 1500.0;
    double x_half_exit_mm = 2000.0;
    double y_half_exit_mm = 3000.0;
    double total_length_mm = 50000.0;
    int n_sub_frustum = 10;
    double y_floor_mm = -3000.0;
    double z_entrance_mm = -25000.0;
 
    // ── H-beam cross-section (HEA 260 approximation) ────────────────────
    double hbeam_height_mm = 250.0;
    double hbeam_flange_width_mm = 260.0;
    double hbeam_flange_thickness_mm = 12.5;
    double hbeam_web_thickness_mm = 7.5;
 
    // ── Sensor containers / cells ───────────────────────────────────────
    double container_thickness_mm = 225.0;
    double wall_thickness_mm = 5.0;
    int n_cells = 6;
    double sensor_clearance_mm = 1.0;
 
    // ── Helium decay region ─────────────────────────────────────────────
    double helium_clearance_mm = 10.0;
 
    // ── Material names (resolved from SHiPMaterials) ────────────────────
    std::string material_steel = "Iron";
    std::string material_wall = "Aluminium";
    std::string material_cell = "LAB";
    std::string material_helium = "PressurisedHe90";
    std::string material_air = "Air";
 
    // ── Derived quantities ──────────────────────────────────────────────
    double subLength() const { return total_length_mm / n_sub_frustum; }
    double webHeight() const { return hbeam_height_mm - 2.0 * hbeam_flange_thickness_mm; }
    int nWalls() const { return n_cells + 1; }
};
 
SBTConfig readSBTConfig(const std::string& path);
 
}  // namespace SHiPGeometry