{
  "baseline": {
    "tapes_along_width": 8,
    "turns_along_normal": 320
  },
  "choices": {
    "tapes_along_width": [
      2,
      3,
      4,
      6,
      8
    ],
    "turns_along_normal": [
      40,
      80,
      120,
      160,
      240,
      320
    ]
  },
  "cost": {
    "assembly_cost_per_pancake_usd": 500.0,
    "joint_cost_usd": 200.0,
    "price_usd_per_m": 30.0,
    "scrap_fraction": 0.1
  },
  "execution": {
    "max_threads": 5
  },
  "fixed_geometry": {
    "bend_radius_m": 0.028,
    "radial_pitch_m": 0.0001,
    "straight_half_length_m": 0.1,
    "tape_normal": "radial",
    "tape_width_m": 0.012
  },
  "id": "oc010-featherm2-L0.100-R0.028",
  "limits": {
    "interpolation_overprediction_budget": 0.1,
    "max_along_current_field_fraction": 0.2,
    "max_self_field_ratio": 0.1,
    "utilization_limit": 0.8
  },
  "manufacturing": {
    "min_inner_bend_radius_m": 0.005
  },
  "material": {
    "angle_mapping": "period_180_field_reversal",
    "csv_sha256": "043cbaab9a32da5de6394b136265835b9c5917e28861d0793544c5e3885f893b",
    "dataset_id": "robinson-superpower-ap-v3-lowfield",
    "field_basis_mapping": "pack_field_as_applied_field_self_field_consistent",
    "field_magnitude_policy": "total_magnitude_with_transverse_angle",
    "low_field_clamp_t": 0.0501,
    "low_field_policy": "monotone_field_lower_bound",
    "method": "measured-coordinate-tetrahedral-log-field-log-ic/v1",
    "mirror_policy": "minimum_of_mirror_pair",
    "monotonicity_tolerance": 0.002
  },
  "numerics": {
    "field_scale_t": 1.0,
    "max_refinement_change_fraction": 0.0025,
    "quadrature_orders": [
      10,
      14
    ]
  },
  "operating": {
    "electric_field_criterion_v_per_m": 0.0001,
    "temperature_k": 21.0
  },
  "provenance": "OC-010 real-coil benchmark cell (study, not a frozen benchmark): OC-007 physics and synthetic cost model; requirement re-derived from the published Feather-M2 spec (CERN/EuCARD-2): 3.1 T achieved standalone over a 40 mm aperture x ~250 mm straight usable volume, here as a +-[0.08000000000000002, 0.02, 0.02] m region (x-extent 0.8*l) with a 3x3x3 lattice. Their magnet: ~800 mm racetrack, 2 poles x 2 decks of 15-strand Roebel cable (~2 mm Sunam tape), ~190 m 12 mm-equivalent tape (approximate). Manufacturing floor 0.005 m -- measured easy-way REBCO bend limit (~4.5-6.5 mm at 77 K); the 40 mm bore forces the real minimum R anyway.",
  "pruning": {
    "coarse_stations": [
      "arc_apex",
      "straight_center"
    ],
    "coarse_turn_fractions": [
      {
        "kind": "from_start",
        "offset": 1
      },
      {
        "kind": "fraction",
        "value": 0.5
      },
      {
        "kind": "from_end",
        "offset": 0
      }
    ],
    "coarse_width_indices": [
      0,
      4
    ]
  },
  "refined_plan": {
    "additional_stations": [
      {
        "azimuth_deg": 15.0,
        "id": "arc_15",
        "kind": "arc"
      },
      {
        "azimuth_deg": 30.0,
        "id": "arc_30",
        "kind": "arc"
      },
      {
        "azimuth_deg": 60.0,
        "id": "arc_60",
        "kind": "arc"
      },
      {
        "azimuth_deg": 75.0,
        "id": "arc_75",
        "kind": "arc"
      },
      {
        "id": "straight_a",
        "kind": "straight",
        "x_m": 0.04000000000000001
      },
      {
        "id": "straight_b",
        "kind": "straight",
        "x_m": 0.08000000000000002
      }
    ],
    "max_sampling_shortfall_fraction": 0.02
  },
  "refinement": {
    "brackets": [
      {
        "fail_turns": 40,
        "pass_turns": 320,
        "tapes": 2
      },
      {
        "fail_turns": 40,
        "pass_turns": 240,
        "tapes": 3
      },
      {
        "fail_turns": 40,
        "pass_turns": 200,
        "tapes": 4
      },
      {
        "fail_turns": 40,
        "pass_turns": 140,
        "tapes": 6
      },
      {
        "fail_turns": 40,
        "pass_turns": 100,
        "tapes": 8
      }
    ],
    "monotonicity_check": true,
    "pancake_counts": [
      2,
      3,
      4,
      6,
      8
    ],
    "turn_bounds": {
      "max": 400,
      "min": 1
    },
    "turn_resolution": 5
  },
  "requirement": {
    "b_target_t": 3.1,
    "bore_probe_m": [
      0.0,
      0.0,
      0.0
    ],
    "good_field_region": {
      "half_extents_m": [
        0.08000000000000002,
        0.02,
        0.02
      ],
      "points_per_axis": 3
    },
    "tolerance_fraction": 1e-09
  },
  "sampling": {
    "relative_turn_indices": [
      {
        "kind": "from_start",
        "offset": 1
      },
      {
        "kind": "from_start",
        "offset": 2
      },
      {
        "kind": "from_start",
        "offset": 3
      },
      {
        "kind": "from_start",
        "offset": 5
      },
      {
        "kind": "from_start",
        "offset": 10
      },
      {
        "kind": "from_start",
        "offset": 20
      },
      {
        "kind": "fraction",
        "value": 0.25
      },
      {
        "kind": "fraction",
        "value": 0.5
      },
      {
        "kind": "fraction",
        "value": 0.75
      },
      {
        "kind": "from_end",
        "offset": 19
      },
      {
        "kind": "from_end",
        "offset": 9
      },
      {
        "kind": "from_end",
        "offset": 4
      },
      {
        "kind": "from_end",
        "offset": 1
      },
      {
        "kind": "from_end",
        "offset": 0
      }
    ],
    "stations": [
      {
        "id": "straight_center",
        "kind": "straight",
        "x_m": 0.0
      },
      {
        "id": "straight_near_junction",
        "kind": "straight",
        "x_m": 0.09000000000000001
      },
      {
        "azimuth_deg": 0.0,
        "id": "arc_apex",
        "kind": "arc"
      },
      {
        "azimuth_deg": 45.0,
        "id": "arc_mid",
        "kind": "arc"
      }
    ],
    "width_points": 5
  },
  "schema": "optcoil-coupled-search/v3"
}