{
  "title": "NASA Ames EAST MHD studies: timeline with evidence and metric boundaries",
  "purpose": "Explain why values across the 2001 plan, 2003 EAST paper and 2004 model-versus-test paper must not be treated as one matched performance curve.",
  "records": [
    {
      "year": 2001,
      "source": "https://ntrs.nasa.gov/citations/20010089315",
      "evidence_type": "test-plan/preprint",
      "claim": "20-30 percent velocity-rise estimate at 3.5-4 T",
      "metric": "idealized one-dimensional analysis, not a measured result",
      "status": "source says the accelerator was being fabricated"
    },
    {
      "year": 2003,
      "source": "https://www.researchgate.net/publication/268559053_Experimental_Demonstration_of_MHD_Acceleration",
      "publisher_doi": "https://doi.org/10.2514/6.2003-4285",
      "evidence_type": "author-uploaded conference-paper text; publisher PDF download not obtained",
      "claim": "about 40 percent maximum at mean B about 0.92 T; about 120 percent projected at 3 T",
      "metric": "maximum acceleration inferred from EMF measured at the last electrode pair; 3-T value is a projection"
    },
    {
      "year": 2004,
      "source": "https://ntrs.nasa.gov/citations/20040105526",
      "pdf": "https://ntrs.nasa.gov/api/citations/20040105526/downloads/20040105526.pdf",
      "evidence_type": "NASA-hosted numerical study compared with separately reported experiment",
      "claim": "Runs 15 and 16 report approximate measured cross-section-averaged velocity increases of 27 and 38 percent; calculations are listed separately",
      "metric": "cross-section-averaged velocity comparison for specific run IDs, not last-electrode back-EMF"
    }
  ],
  "relationship": "The 2004 study cites Bogdanoff and Mehta (AIAA 2003-4285) for the underlying NASA Ames experimental channel. The papers belong to a related EAST evidence chain, but this display does not assert that the 2003 maximum and 2004 Run 15/16 means are the same runs or directly comparable observables.",
  "not_established": [
    "A measured 3 T result",
    "One continuous trend across the three records",
    "Matched integrated HVEPS generator-to-accelerator operation",
    "Whole-vehicle energy closure or net aircraft thrust"
  ],
  "visual_credit": "Original DMGB Systems vector diagram based on the linked records; not a source-paper figure, not to scale.",
  "generator": "nasa-ames-mhd-study-chain-v338.py",
  "outputs": [
    "nasa-ames-mhd-study-chain.svg",
    "nasa-ames-mhd-study-chain-mobile.svg"
  ],
  "core_flow_energy_partition": {
    "source": "https://www.researchgate.net/publication/268559053_Experimental_Demonstration_of_MHD_Acceleration",
    "source_status": "Author-uploaded text of AIAA 2003-4285; publisher-hosted PDF not obtained",
    "scope": "Approximate author analysis of MHD power partition within the accelerator core flow for the discussed case",
    "kinetic_energy_increase_percent_approx": 45,
    "joule_heating_percent_approx": 55,
    "classification": "Approximate component-analysis partition, not separately metered whole-system energy closure or recovered electrical output",
    "system_boundary": "Capacitor bank charged from a conventional supply and a separately pulsed electromagnet; no demonstrated generator-to-accelerator loop",
    "not_established": [
      "Net recovered electrical power after generator, conditioning, magnet, cooling, seed, and thermal losses",
      "Integrated engine energy closure",
      "Vehicle net thrust or net energy benefit"
    ],
    "do_not_multiply_by_reported_power_range": "The approximate split is not shown to apply across the full reported test power range; deriving watt values from it would be unsupported.",
    "load_factor_definition": "LF = E/(uB) = (delta_kinetic_energy_increase + core_flow_Joule_heating)/(delta_kinetic_energy_increase)",
    "source_reported_load_factor_range_decimal_convention": [
      2.1,
      2.3
    ],
    "source_locator": "Section IV.E, PDF p. 20 / printed p. 19; Figure 19 is PDF p. 21 / printed p. 20 and shows electrode pair 10 versus capacitor voltage at nominal mean field 0.92 T",
    "derived_exact_fractions": {
      "kinetic_at_LF_2_1": "10/21",
      "joule_at_LF_2_1": "11/21",
      "midpoint_kinetic_at_LF_2_2": "5/11",
      "midpoint_joule_at_LF_2_2": "6/11",
      "kinetic_at_LF_2_3": "10/23",
      "joule_at_LF_2_3": "13/23"
    },
    "derived_percent_span_source_decimal_convention": {
      "kinetic_energy_increase_approx": [
        43.5,
        47.6
      ],
      "joule_heating_approx": [
        52.4,
        56.5
      ]
    },
    "midpoint_approx_percent_source_decimal_convention": {
      "kinetic_energy_increase": 45.5,
      "joule_heating": 54.5
    },
    "base12_exact_repeating_expansions": {
      "LF_21_over_10": "2.1(2497)",
      "LF_11_over_5": "2.(2497)",
      "LF_23_over_10": "2.3(7249)",
      "kinetic_10_over_21": "0.5(86A351)",
      "joule_11_over_21": "0.6(35186A)",
      "midpoint_kinetic_5_over_11": "0.(5)",
      "midpoint_joule_6_over_11": "0.(6)",
      "kinetic_10_over_23": "0.(527379AB58A)",
      "joule_13_over_23": "0.(69484210631)"
    },
    "range_interpretation": "The source says the calculated load factors vary across the capacitor-voltage cases. Inverting the two reported endpoints yields an approximate component-analysis span, not a statistical uncertainty/confidence interval or an unpaired independent measurement.",
    "outputs": [
      "nasa-ames-core-flow-partition.svg",
      "nasa-ames-core-flow-partition-mobile.svg"
    ],
    "data_file": "nasa-ames-core-flow-partition.csv",
    "generator": "nasa-ames-core-flow-partition.py"
  }
}