{
  "checkpoint_date": "2026-06-11",
  "project": "EmberScope rural fire-service camera concept",
  "todo_item": "RFS-028",
  "candidate": {
    "name": "four_mirror_folded_seed",
    "title": "Four-mirror folded branch",
    "description": "Scaled four-mirror folded conic branch from build_4m_folded, using a 40 mm entrance pupil and enlarged clear apertures for an RFS-sized first screen.",
    "source_builder": "telescope_explorer.src.architecture.build_4m_folded",
    "mirror_count": 4,
    "entrance_aperture_mm": 40.0,
    "nominal_f_number": 5.0,
    "full_field_deg": 3.0,
    "field_points_deg": [
      0.0,
      0.75,
      1.5
    ],
    "clear_apertures_mm": [
      64.0,
      42.0,
      40.0,
      36.0
    ],
    "detector_pixel_pitch_um": 17.0,
    "transmission_proxy": 0.7330556249999999,
    "envelope_mm": [
      64.0,
      95.51505262016016,
      46.97783521129242
    ],
    "envelope_max_mm": 95.51505262016016,
    "envelope_target_mm": 150.0,
    "mass_proxy_kg": 0.34332476180786076,
    "mass_budget_kg": 2.0,
    "sensor_center_mm": [
      -1.816050297001096e-16,
      58.175897768707955,
      -18.41933984903664
    ],
    "sensor_sanity_pass": true,
    "edge_centroided_rms_spot_um": 1026.460369485627,
    "edge_aperture_valid_fraction": 0.6388888888888888,
    "edge_ensquared_2px_fraction": 0.0,
    "surfaces": [
      {
        "surface": 1,
        "name": "M1_primary",
        "shape_family": "conic",
        "position_mm": [
          0.0,
          0.0,
          0.0
        ],
        "tip_deg": 8.0,
        "tilt_deg": 0.0,
        "radius_mm": -100.0,
        "conic_k": -1.0,
        "diameter_mm": 64.0,
        "rnorm_mm": 20.0
      },
      {
        "surface": 2,
        "name": "M2_secondary",
        "shape_family": "conic",
        "position_mm": [
          0.0,
          8.269120674509974,
          -28.837850878149567
        ],
        "tip_deg": -18.0,
        "tilt_deg": 0.0,
        "radius_mm": -50.0,
        "conic_k": -3.0,
        "diameter_mm": 42.0,
        "rnorm_mm": 10.0
      },
      {
        "surface": 3,
        "name": "M3_tertiary",
        "shape_family": "conic",
        "position_mm": [
          0.0,
          27.969389514678017,
          -13.446313995008104
        ],
        "tip_deg": 8.0,
        "tilt_deg": 0.0,
        "radius_mm": -80.0,
        "conic_k": 0.5,
        "diameter_mm": 40.0,
        "rnorm_mm": 8.0
      },
      {
        "surface": 4,
        "name": "M4_fold",
        "shape_family": "spherical",
        "position_mm": [
          0.0,
          46.513066606013766,
          -20.938445863326354
        ],
        "tip_deg": -5.0,
        "tilt_deg": 0.0,
        "radius_mm": 150.0,
        "conic_k": 0.0,
        "diameter_mm": 36.0,
        "rnorm_mm": 6.0
      }
    ],
    "csv_filename": "four_mirror_seed_metrics_2026-06-11.csv",
    "json_filename": "four_mirror_seed_metrics_2026-06-11.json",
    "optimization_csv_filename": "four_mirror_seed_focus_sweep_2026-06-11.csv",
    "prescription_csv_filename": "four_mirror_seed_prescription_step_2026-06-11.csv",
    "obstruction_csv_filename": "four_mirror_seed_obstruction_screen_2026-06-11.csv"
  },
  "field_metrics": [
    {
      "field_deg": 0.0,
      "traced_rays": 216,
      "aperture_valid_fraction": 0.8611111111111112,
      "centroided_rms_spot_um": 1721.4978618113191,
      "geo_ee80_radius_um": 2177.2295997819797,
      "ensquared_2px_fraction": 0.0,
      "ensquared_16px_fraction": 0.0,
      "mtf_0_50_nyquist_proxy": 0.0,
      "small_hot_target_snr_factor": 0.0,
      "status": "image-spread limited; low MTF proxy"
    },
    {
      "field_deg": 0.75,
      "traced_rays": 216,
      "aperture_valid_fraction": 1.0,
      "centroided_rms_spot_um": 1450.0325109139083,
      "geo_ee80_radius_um": 1787.0864604957733,
      "ensquared_2px_fraction": 0.0,
      "ensquared_16px_fraction": 0.009259259259259259,
      "mtf_0_50_nyquist_proxy": 0.0,
      "small_hot_target_snr_factor": 0.0,
      "status": "image-spread limited; low MTF proxy"
    },
    {
      "field_deg": 1.5,
      "traced_rays": 216,
      "aperture_valid_fraction": 0.6388888888888888,
      "centroided_rms_spot_um": 1026.460369485627,
      "geo_ee80_radius_um": 1294.810780391241,
      "ensquared_2px_fraction": 0.0,
      "ensquared_16px_fraction": 0.028985507246376812,
      "mtf_0_50_nyquist_proxy": 0.0,
      "small_hot_target_snr_factor": 0.0,
      "status": "vignetting risk; image-spread limited; low MTF proxy"
    }
  ],
  "interpretation": {
    "rfs_025_optical_stack": "The branch was measured with centroided spot, vignetting, detector energy, MTF proxy, tolerance, clearance-relief, focus-sweep, curvature-step, and beam-obstruction rows.",
    "rfs_026_mechanical_stack": "The branch fits the 150 mm envelope and sub-2 kg mass proxy, but edge-field vignetting remains a mechanical and optical clearance risk until mirror-cell clear apertures are optimized.",
    "rfs_027_review_package": "CSV, JSON, markdown, and site-page artifacts exist for review; a full per-family review package should wait until the measured families have optimized, comparable prescriptions.",
    "readiness": "Needs maturation: detector-energy and image-spread rows still need optimization, and obstruction must be cleared before this branch can become a prescription.",
    "candidate_summary": "The four-mirror branch was chosen for full prescription optimization because it was the lowest-complexity screened branch that fit the package and mass screens. The optimized version (10 June 2026) is now the reference design; this seed layout is self-obstructed and kept only as screening history."
  },
  "tolerance_screen": {
    "tolerance_trials": 64,
    "relative_tolerance_yield_proxy": 0.0,
    "perturbed_edge_rms_p90_um": 2184.661945312653,
    "perturbed_edge_throughput_p10": 0.6162790697674418,
    "wfe_baseline_rms_waves": 44.93793934342085,
    "wfe_target_rms_waves": 0.25,
    "wfe_margin_status": "No WFE margin",
    "clearance_target_edge_throughput": 0.7,
    "clearance_scale": 1.1,
    "clearance_package_span_mm": 100.34734807456226,
    "clearance_mass_proxy_kg": 0.35242296178751154,
    "clearance_edge_throughput": 0.75,
    "clearance_edge_rms_spot_um": 1106.5693348613042,
    "clearance_ensquared_2px_fraction": 0.0,
    "readiness_gate": "Screening only: WFE has no margin, so optimize image quality before detailed tolerancing."
  },
  "optimization_screen": {
    "trial_count": 36,
    "focus_offsets_mm": [
      -3.0,
      -2.0,
      -1.0,
      -0.5,
      0.0,
      0.5,
      1.0,
      2.0,
      3.0
    ],
    "clearance_scales": [
      1.0,
      1.1,
      1.2,
      1.3
    ],
    "baseline_edge_rms_spot_um": 1026.460369485627,
    "baseline_edge_throughput": 0.6388888888888888,
    "baseline_ensquared_16px_fraction": 0.028985507246376812,
    "best_focus_offset_mm": -3.0,
    "best_clearance_scale": 1.1,
    "best_package_span_mm": 100.34734807456226,
    "best_mass_proxy_kg": 0.35242296178751154,
    "best_edge_throughput": 0.75,
    "best_edge_rms_spot_um": 691.0503423128712,
    "best_edge_ensquared_2px_fraction": 0.0,
    "best_edge_ensquared_16px_fraction": 0.04938271604938271,
    "best_edge_status": "image-spread limited; low MTF proxy",
    "edge_rms_improvement_um": 335.4100271727559,
    "edge_rms_improvement_fraction": 0.32676373793255586,
    "best_clearance_limited_focus_offset_mm": -3.0,
    "best_clearance_limited_scale": 1.1,
    "best_clearance_limited_edge_rms_spot_um": 691.0503423128712,
    "best_clearance_limited_edge_throughput": 0.75,
    "readiness_gate": "Screening only: refocus and aperture relief improve edge RMS, but 2x2-pixel detector energy still fails."
  },
  "optimization_trials": [
    {
      "clearance_scale": 1.0,
      "focus_offset_mm": -3.0,
      "package_span_mm": 95.51505262016016,
      "mass_proxy_kg": 0.34332476180786076,
      "edge_throughput": 0.6388888888888888,
      "edge_rms_spot_um": 644.051770987279,
      "edge_ensquared_2px_fraction": 0.0,
      "edge_ensquared_16px_fraction": 0.057971014492753624,
      "edge_status": "vignetting risk; image-spread limited; low MTF proxy",
      "score": 699.3657806491148
    },
    {
      "clearance_scale": 1.0,
      "focus_offset_mm": -2.0,
      "package_span_mm": 95.51505262016016,
      "mass_proxy_kg": 0.34332476180786076,
      "edge_throughput": 0.6388888888888888,
      "edge_rms_spot_um": 767.3146447184603,
      "edge_ensquared_2px_fraction": 0.0,
      "edge_ensquared_16px_fraction": 0.028985507246376812,
      "edge_status": "vignetting risk; image-spread limited; low MTF proxy",
      "score": 825.5272051049337
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      "package_span_mm": 95.51505262016016,
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      "edge_rms_spot_um": 1497.354030799028,
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    {
      "clearance_scale": 1.2,
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