49-Error Budget Card Template v1.0 | Chapter 0 — Preface & User Guide

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Chapter 0 — Preface & User Guide

I. Purpose & Scope

• Define a unified specification for protocol-level error-source identification, propagation, and uncertainty reporting to support runtime validation, publication, and comparative scoring.
• Applicable to timing / imaging / spectral / mixed; paraxial/small-angle, slowly varying medium within coherence windows; aligned with PTN Template v1.0 and Experimental Protocol Card Template v1.0.
• Not applicable: strong nonlinearity/dispersion/full-wave coupling beyond coherence windows (enter [Restricted] and publish qualitative conclusions only).

II. Audience & Applicability

• Audience: experiment/observation leads, metrology & data governance, review & release owners.
• Scope: error budgets and interval reporting for T_arr, Phi, ε_flux, ΔM, Q_res, and related metrics.
• Preconditions: clock_state = locked, |ts_start − calib.timestamp| ≤ τ_calib, p_dim = 1.0, len(path) ≥ 2.

III. Citations & Versioning

• Fixed syntax: See "<Volume> vX.Y" <Chapter> <Anchor>; prioritize P/S/M/I.
• Stability line: public releases cite v1.* only; if v0.* appears, mark “draft / non-committal” prominently in text.
• Keep text and data-side see[]/references[] consistent, anchor coverage ≥ 90%, no external links or aliases.

IV. Normative Forms (paste-ready)

• Arrival time (two equivalent forms):
  T_arr = ( 1 / c_ref ) * ( ∫ n_eff d ell )
  T_arr = ( ∫ ( n_eff / c_ref ) d ell )
• Phase accumulation:
  Phi = ( 2π / λ_ref ) * ( ∫ n_eff d ell )
• Requirements: explicitly show path gamma(ell) and measure d ell in text, and record delta_form ∈ {general, factored} in data/metadata; n_eff dimensionless; c_ref in m/s; T_arr in s; Phi in rad.
• Dimensional closure: include check_dim_report.json in exports.

V. Structure & Deliverables

• Chapter skeleton: Purpose & Scope → Inputs & Preconditions → Methods & Conventions (Delta/MC/Bootstrap) → Results & Checks → Compliance & Stops → Outputs & Exports → Citations.
• Required machine-readable outputs: error_budget.csv, uncertainty.md, check_dim_report.json, and (if applicable) uncertainty.yaml.
• Table convention: each error source reported as source, symbol, unit, type(A/B), estimate, distribution, correlation, note, see[].

VI. Dependencies & Cross-References

• Metrology & control equations: See "EFT.WP.Core.Metrology v1.0" check_dim; See "EFT.WP.Core.Equations v1.1" Ch.2 S20-1/S21-2.
• Protocol alignment: See "PTN Template v1.0" Ch.7/Ch.9/Ch.11; See "Experimental Protocol Card Template v1.0" Ch.5/Ch.7/Ch.9/Ch.11.
• Data contract: See "EFT.WP.Core.DataSpec v1.0" TARR (fields, units, exports).

VII. Pre-Flight Checklist

• Text and data see[]/references[] use “volume + version + anchor”, anchor coverage ≥ 90%.
• Path expressions explicitly show gamma(ell) and d ell; delta_form recorded; len(path) ≥ 2.
• p_dim = 1.0, clock_state = locked, |ts_start − calib.timestamp| ≤ τ_calib.
• Arrival/phase use the unified forms; error_budget.csv / uncertainty.md / check_dim_report.json are ready.
• Bare c, T, n are forbidden; use c_ref, specific quantity name (e.g., T_arr), and n_eff (or n with explicit unit); do not mix T_fil/T_trans or n/n_eff.
• If [Restricted], publish qualitative intervals and diagnostics only, and append [Restricted] to all figure titles.