{
  "title": "Reproduction of NASA PPE Hall-thruster performance results",
  "source": {
    "authors": "Jason D. Frieman et al.",
    "meeting": "2021 JANNAF Meeting",
    "nasa_ntrs_document_id": "20210015735",
    "url": "https://ntrs.nasa.gov/citations/20210015735",
    "source_location": "Slides 12–14 (PDF pages 12–14), 8 operating conditions."
  },
  "extraction": "Exact numerical values transcribed from the source table on slide 13 (the same table is repeated on slide 14); thrust uncertainty comes from slide 12 and the combined table. No plot digitization, interpolation or synthetic measurements.",
  "values": {
    "conditions": 8,
    "thrust_uncertainty": "±5 mN",
    "specific_impulse_uncertainty": "±0.9% relative",
    "total_efficiency_uncertainty": "±1.7% relative"
  },
  "visualization": "Three small-multiple plots with horizontal positions equally spaced by condition number in the source table order. The x position is categorical and is not proportional to discharge power. This preserves the two distinct 600 V / 12 kW settings, one of which is marked 14%. Error bars use the source-reported uncertainties. Dashed connections are visual guides only and do not represent a fitted or predictive model. Focused y axes are explicitly shown.",
  "limitations": [
    "No raw repeated measurements, sample counts, uncertainty distribution or confidence-interval method are provided.",
    "The slide says all eight conditions met or exceeded preliminary PPE requirements; the plotted table does not provide threshold values needed to independently assess that statement.",
    "Slide 14 says few comparable HERMeS TDU measurements existed and results were in-family with scaled predictions, but provides no numerical model or prediction residuals.",
    "These are laboratory vacuum tests of an in-space electric thruster with carried propellant and supplied electrical power, not atmospheric hypersonic flight or MHD energy recovery."
  ],
  "reproduction": "Run generate_aeps_ppe_figure.py using the Python standard library. It reads aeps-ppe-test-data.csv and writes wide and mobile SVGs.",
  "rights": "NASA NTRS record 20210015735 marks the presentation Public Use Permitted. Redraw does not imply NASA endorsement."
}