The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Given as a target, not a fixed date, per the pin description: "…arch for rare processes into the 2040s. Estimated date.…"
This arXiv paper, submitted for a November 2024 CERN[3] Accelerator School contribution, summarizes HL-LHC technical goals but its abstract gives no specific startup timeline, leaving the pin's estimated June 2030 date unconfirmed by this source alone.
CERN's own Technical Design Report (published 17 December 2020) describes the HL-LHC as a 'major upgrade' planned 'in the 2020s' without pinning an exact start date, consistent with the pin's own estimated framing for a mid-2030 start.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most.
