{
  "checkpoint_date": "2026-06-11",
  "project": "EmberScope rural fire-service camera concept",
  "todo_item": "RFS-028",
  "candidate": {
    "name": "seven_mirror_cold_stop_relay_seed",
    "title": "Seven-mirror cold-stop relay branch",
    "description": "Scaled seven-mirror relay branch from build_7m_cold_stop_relay, extending the dual-triplet branch with a weak pupil-side relay so the seven-plus-mirror family has a measured RFS-sized starting point.",
    "source_builder": "telescope_explorer.src.architecture.build_7m_cold_stop_relay",
    "mirror_count": 7,
    "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,
      34.0,
      32.0,
      30.0
    ],
    "detector_pixel_pitch_um": 17.0,
    "transmission_proxy": 0.6285035664843748,
    "envelope_mm": [
      64.0,
      118.5903861535102,
      46.97783521129242
    ],
    "envelope_max_mm": 118.5903861535102,
    "envelope_target_mm": 150.0,
    "mass_proxy_kg": 0.35856462777042486,
    "mass_budget_kg": 2.0,
    "sensor_center_mm": [
      -4.263950303950992e-16,
      69.65871739915694,
      -21.31255532986811
    ],
    "sensor_sanity_pass": true,
    "edge_centroided_rms_spot_um": 3496.4358835285584,
    "edge_aperture_valid_fraction": 0.6388888888888888,
    "edge_ensquared_2px_fraction": 0.0,
    "surfaces": [
      {
        "surface": 1,
        "name": "M1_fore_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_fore_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_fore_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_relay_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
      },
      {
        "surface": 5,
        "name": "M5_near-flat_relay",
        "shape_family": "spherical",
        "position_mm": [
          0.0,
          56.29454261335182,
          -18.859328955148754
        ],
        "tip_deg": 12.0,
        "tilt_deg": 0.0,
        "radius_mm": 5000.0,
        "conic_k": 0.0,
        "diameter_mm": 34.0,
        "rnorm_mm": 6.0
      },
      {
        "surface": 6,
        "name": "M6_image-side_corrector",
        "shape_family": "conic",
        "position_mm": [
          0.0,
          65.09787101995607,
          -16.988123737788925
        ],
        "tip_deg": 14.0,
        "tilt_deg": 0.0,
        "radius_mm": -240.0,
        "conic_k": -0.6,
        "diameter_mm": 32.0,
        "rnorm_mm": 5.2
      },
      {
        "surface": 7,
        "name": "M7_cold-stop_relay",
        "shape_family": "conic",
        "position_mm": [
          0.0,
          72.78796458746262,
          -14.783024891252927
        ],
        "tip_deg": -10.0,
        "tilt_deg": 0.0,
        "radius_mm": 360.0,
        "conic_k": 0.2,
        "diameter_mm": 30.0,
        "rnorm_mm": 4.8
      }
    ],
    "csv_filename": "seven_mirror_seed_metrics_2026-06-11.csv",
    "json_filename": "seven_mirror_seed_metrics_2026-06-11.json",
    "optimization_csv_filename": "seven_mirror_seed_focus_sweep_2026-06-11.csv",
    "prescription_csv_filename": "seven_mirror_seed_prescription_step_2026-06-11.csv",
    "obstruction_csv_filename": "seven_mirror_seed_obstruction_screen_2026-06-11.csv"
  },
  "field_metrics": [
    {
      "field_deg": 0.0,
      "traced_rays": 216,
      "aperture_valid_fraction": 0.37037037037037035,
      "centroided_rms_spot_um": 3240.4233292429503,
      "geo_ee80_radius_um": 3895.3903764918764,
      "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": "vignetting risk; image-spread limited; low MTF proxy"
    },
    {
      "field_deg": 0.75,
      "traced_rays": 216,
      "aperture_valid_fraction": 0.9166666666666666,
      "centroided_rms_spot_um": 4707.071887996405,
      "geo_ee80_radius_um": 5867.835807826525,
      "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": 1.5,
      "traced_rays": 216,
      "aperture_valid_fraction": 0.6388888888888888,
      "centroided_rms_spot_um": 3496.4358835285584,
      "geo_ee80_radius_um": 4381.50866020276,
      "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": "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 seven-mirror branch was the highest-mirror-count screened family. It kept the package and mass proxies inside the payload envelope while carrying a foreoptics-plus-relay grouping into the trace stack, but its seed layout is self-obstructed; it would need full prescription optimization to re-enter the trade."
  },
  "tolerance_screen": {
    "tolerance_trials": 64,
    "relative_tolerance_yield_proxy": 0.296875,
    "perturbed_edge_rms_p90_um": 5451.012192111503,
    "perturbed_edge_throughput_p10": 0.6162790697674418,
    "wfe_baseline_rms_waves": 43095.09239875789,
    "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": 123.09822548614926,
    "clearance_mass_proxy_kg": 0.37086319960221403,
    "clearance_edge_throughput": 0.75,
    "clearance_edge_rms_spot_um": 3790.2152746140064,
    "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": 3496.4358835285584,
    "baseline_edge_throughput": 0.6388888888888888,
    "baseline_ensquared_16px_fraction": 0.0,
    "best_focus_offset_mm": -3.0,
    "best_clearance_scale": 1.0,
    "best_package_span_mm": 118.5903861535102,
    "best_mass_proxy_kg": 0.35856462777042486,
    "best_edge_throughput": 0.6388888888888888,
    "best_edge_rms_spot_um": 3060.8775563051304,
    "best_edge_ensquared_2px_fraction": 0.0,
    "best_edge_ensquared_16px_fraction": 0.0,
    "best_edge_status": "vignetting risk; image-spread limited; low MTF proxy",
    "edge_rms_improvement_um": 435.558327223428,
    "edge_rms_improvement_fraction": 0.12457209047513496,
    "best_clearance_limited_focus_offset_mm": -3.0,
    "best_clearance_limited_scale": 1.1,
    "best_clearance_limited_edge_rms_spot_um": 3316.3746216470645,
    "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": 118.5903861535102,
      "mass_proxy_kg": 0.35856462777042486,
      "edge_throughput": 0.6388888888888888,
      "edge_rms_spot_um": 3060.8775563051304,
      "edge_ensquared_2px_fraction": 0.0,
      "edge_ensquared_16px_fraction": 0.0,
      "edge_status": "vignetting risk; image-spread limited; low MTF proxy",
      "score": 3121.9886674162417
    },
    {
      "clearance_scale": 1.0,
      "focus_offset_mm": -2.0,
      "package_span_mm": 118.5903861535102,
      "mass_proxy_kg": 0.35856462777042486,
      "edge_throughput": 0.6388888888888888,
      "edge_rms_spot_um": 3205.997038130861,
      "edge_ensquared_2px_fraction": 0.0,
      "edge_ensquared_16px_fraction": 0.0,
      "edge_status": "vignetting risk; image-spread limited; low MTF proxy",
      "score": 3267.108149241972
    },
    {
      "clearance_scale": 1.0,
      "focus_offset_mm": -1.0,
      "package_span_mm": 118.5903861535102,
      "mass_proxy_kg": 0.35856462777042486,
      "edge_throughput": 0.6388888888888888,
      "edge_rms_spot_um": 3351.18603375209,
      "edge_ensquared_2px_fraction": 0.0,
      "edge_ensquared_16px_fraction": 0.0,
      "edge_status": "vignetting risk; image-spread limited; low MTF proxy",
      "score": 3412.2971448632015
    },
    {
      "clearance_scale": 1.0,
      "focus_offset_mm": -0.5,
      "package_span_mm": 118.5903861535102,
      "mass_proxy_kg": 0.35856462777042486,
      "edge_throughput": 0.6388888888888888,
      "edge_rms_spot_um": 3423.8038358539347,
      "edge_ensquared_2px_fraction": 0.0,
      "edge_ensquared_16px_fraction": 0.0,
      "edge_status": "vignetting risk; image-spread limited; low MTF proxy",
      "score": 3484.914946965046
    },
    {
      "clearance_scale": 1.0,
      "focus_offset_mm": 0.0,
      "package_span_mm": 118.5903861535102,
      "mass_proxy_kg": 0.35856462777042486,
      "edge_throughput": 0.6388888888888888,
      "edge_rms_spot_um": 3496.4358835285584,
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      "score": 3557.5469946396697
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      "package_span_mm": 118.5903861535102,
      "mass_proxy_kg": 0.35856462777042486,
      "edge_throughput": 0.6388888888888888,
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      "package_span_mm": 118.5903861535102,
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      "package_span_mm": 118.5903861535102,
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      "edge_status": "vignetting risk; image-spread limited; low MTF proxy",
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      "score": 3900.2951862844207
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      "mass_proxy_kg": 0.38433306398941175,
      "edge_throughput": 0.8518518518518519,
      "edge_rms_spot_um": 3985.4679169470232,
      "edge_ensquared_2px_fraction": 0.0,
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      "score": 3985.4679169470232
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    {
      "clearance_scale": 1.2,
      "focus_offset_mm": 0.0,
      "package_span_mm": 127.59290291688495,
      "mass_proxy_kg": 0.38433306398941175,
      "edge_throughput": 0.8518518518518519,
      "edge_rms_spot_um": 4070.658717342513,
      "edge_ensquared_2px_fraction": 0.0,
      "edge_ensquared_16px_fraction": 0.0,
      "edge_status": "image-spread limited; low MTF proxy",
      "score": 4070.658717342513
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    {
      "clearance_scale": 1.2,
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      "package_span_mm": 127.59290291688495,
      "mass_proxy_kg": 0.38433306398941175,
      "edge_throughput": 0.8518518518518519,
      "edge_rms_spot_um": 4155.866476240671,
      "edge_ensquared_2px_fraction": 0.0,
      "edge_ensquared_16px_fraction": 0.0,
      "edge_status": "image-spread limited; low MTF proxy",
      "score": 4155.866476240671
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