{
  "scope": "Website presentation derived from saved v26 numerical fields; no optimizer or field solver rerun.",
  "quantity": "Mounted-centerline linear gradient efficiency",
  "units": "mT/m/A",
  "fit_model": "Bz = offset + Gx*x + Gy*y + Gz*z",
  "fit_method": "Unweighted ordinary least squares with an intercept and all three coordinate terms; coordinates scaled by ROI radius for conditioning.",
  "efficiency_definition": "1000 * abs(intended-axis gradient coefficient in T/m) / abs(common per-part current in A)",
  "current_definition": "All coil parts carry their saved common current; the currents are not summed across primary/shield or the two planes.",
  "error_policy": "Original relative RMS Bz errors retain their fixed-current, no-gain/no-offset-fit definition; this descriptive fit does not alter them.",
  "cases": [
    {
      "case": "shielded",
      "intended_axis": "y",
      "ROI_radius_m": 0.02,
      "common_per_part_current_A": 11.071403753593085,
      "target_gradient_T_per_m": 0.02000000000000001,
      "nominal_target_over_current_mT_per_m_per_A": 1.8064556622740149,
      "primary": {
        "sample_count": 2048,
        "offset_T": 1.2074191424329586e-08,
        "gradient_xyz_T_per_m": [
          8.035509070392381e-07,
          0.01947118189997668,
          -3.0880710941320953e-07
        ],
        "fit_residual_rms_T": 6.363085389666216e-06,
        "scaled_design_matrix_condition_number": 2.2362808035171855,
        "gradient_efficiency_mT_per_m_per_A": 1.7586913397190085
      },
      "sensitivity": {
        "sample_count": 4096,
        "offset_T": 1.224558355444826e-08,
        "gradient_xyz_T_per_m": [
          5.085467621014986e-07,
          0.019471171321431495,
          -7.598066353818064e-07
        ],
        "fit_residual_rms_T": 6.363092786387012e-06,
        "scaled_design_matrix_condition_number": 2.236339641025653,
        "gradient_efficiency_mT_per_m_per_A": 1.7586903842353658
      },
      "sources": [
        {
          "path": "v26/numerical/stages/shielded/results.json",
          "sha256": "6248bafdee9709a85a85b54a293ba0ae86ea595052879478389d699289ea9d61"
        },
        {
          "path": "v26/numerical/stages/shielded/fields.npz",
          "sha256": "e3b1c2ce8eea23b3be36f32657f4358527d9fd9eb3b9fb452b108aa2343cd573"
        }
      ]
    },
    {
      "case": "biplanar",
      "intended_axis": "x",
      "ROI_radius_m": 0.02,
      "common_per_part_current_A": 12.070686027894112,
      "target_gradient_T_per_m": 0.01999999999999999,
      "nominal_target_over_current_mT_per_m_per_A": 1.6569066541687896,
      "primary": {
        "sample_count": 2048,
        "offset_T": -1.9637886904433916e-05,
        "gradient_xyz_T_per_m": [
          0.019743799984155146,
          -3.306787013868855e-05,
          -1.6534632045158738e-07
        ],
        "fit_residual_rms_T": 7.210275555154775e-06,
        "scaled_design_matrix_condition_number": 2.2362808035171855,
        "gradient_efficiency_mT_per_m_per_A": 1.635681678616216
      },
      "sensitivity": {
        "sample_count": 4096,
        "offset_T": -1.9644117226401827e-05,
        "gradient_xyz_T_per_m": [
          0.019744087540381428,
          -3.3301871885189275e-05,
          1.1691432670825187e-06
        ],
        "fit_residual_rms_T": 7.2178235296390074e-06,
        "scaled_design_matrix_condition_number": 2.236339641025653,
        "gradient_efficiency_mT_per_m_per_A": 1.6357055013074548
      },
      "sources": [
        {
          "path": "v26/numerical/stages/biplanar/results.json",
          "sha256": "c3400ae80ec4e203114898b9c5f71859088a9d9c6c3e5b76406bab08b6870709"
        },
        {
          "path": "v26/numerical/stages/biplanar/fields.npz",
          "sha256": "640ea4e5248edc9ad9babd049dc547a3d6e804120616f64f7f95f20b46d49f1c"
        }
      ]
    }
  ]
}