Provenance Record

Well-structured News piece (831 words, within the 400-1200 News range). Clear Overview / What We Know / What We Don't Know / Analysis sections. Appropriate technical depth without overreach; the lead correctly frames the news as the publication of the physics-basis papers, not a re-narration of the prior grid-connection story.

Read all five gzipped snapshots from disk (all HTTP 200, no fallbacks). source-0.html.gz (CFS press release): confirms June 4, 2026 date, five peer-reviewed papers in a Journal of Plasma Physics special collection, 58 co-authors, the institution list (MIT, Columbia, UCSD, KTH, Chalmers, Max Planck IPP), the five exact paper titles, ~1.1 GW fusion -> 400 MW net electricity, and the Alex Creely ('In publishing these papers...it'll work') and Bob Mumgaard ('Peer-reviewed research sets the standard...') quotes verbatim and correctly attributed. source-1.html.gz (POWER Magazine, Darrell Proctor, June 4 2026): confirms the publication, special edition, 400 MW, the 58 authors/institutions, early-2030s grid delivery, and the April 28 PJM application. source-2.html.gz (CFS technical blog): confirms 1.1 GW->400 MW, ~280,000 homes, 11.4 tesla field, 15-minute pulses with 1-minute pauses, the 'arguably for the first time, a realistic physics design point' and 'on the whole, disruptions do not get more severe as we step up from SPARC to ARC' quotes, and the 'more mature than SPARC' characterization (blog: 'the maturity of the models and workflows are more advanced for ARC than they were for SPARC'). source-3.html.gz (IEEE Spectrum): confirms 280,000 homes, two-thirds of authors from outside CFS, 150 million degC / 12 million amperes, HTSC magnets, ~20-77 kelvins, 'more compact', SPARC >75% complete, first plasma 2027, one disruption/day + restart within a minute, and the Sorbom 'wrong side of all the uncertainties' quote verbatim. source-4.html.gz (Tech Journal, Apr 28 2026 interview): confirms both Sorbom quotes ('aiming for first plasma in 2027 and then getting a Q greater than one as fast as humanly possible' and 'the single most important thing we can do right now is to publish and be transparent'). Confirmed the bot-blocked Nature news article is NOT cited.

Every specific (June 4 2026 date, five papers, Journal of Plasma Physics, 58 authors, 400 MW / 1.1 GW, 11.4 tesla, 12 MA, 150 million degC, 20-77 K, 75% SPARC completion, 2027 first plasma, April 28 PJM filing) traces to a cited source. No hallucinated quotes; all direct quotes appear verbatim with the correct speaker and title. The Creely/Mumgaard/Sorbom attributions are all accurate.

APPROVE. High-quality, accurate, neutrally-toned News piece with full source verification across five reputable snapshots. The single automated finding (allowlist warning) covers reputable trade and first-party-press-release domains and is informational only; it is not a factual defect and does not warrant a corrections record.