SciencePosted 09/11/202609/11/2026 at 4:34 am@ThePinGang To timeline

Starts 06/01/2030 ESTIMATED 53% CONFIDENCEGiven as a target, not a fixed date, per the pin description: "…arch for rare processes into the 2040s. Estimated date.…"

Start: Jun 1, 203050% CONFIDENCEfrom the source

High-Luminosity LHC Starts Up

An upgrade to increase the LHC's collision rate roughly tenfold, extending the search for rare processes into the 2040s. Estimated date.

The HL-LHC upgrade raises the LHC's peak luminosity to 5 x 10^34 cm^-2 s^-1 (LHC nominal 1 x 10^34) with integrated luminosity of 3 ab^-1 for ATLAS and CMS^[1]
Physics data-taking is expected at the earliest in 2030: installation of magnets, crab cavities and other equipment runs 2026-2030, Run 4 from mid 2030 to end of 2033, Run 5 from mid 2036 through 2041^[1]
The upgrade uses 11.3 tesla quadrupole magnets versus 8.6 tesla in the LHC; CERN Council approved it in 2016 and underground civil engineering ended in 2022^[1]
CERN's 2020 technical design report describes it as needed to raise instantaneous luminosity by a factor of five beyond the original design value^[3]
Goals include Higgs boson properties, Standard Model measurements, and beyond-Standard-Model searches^[1]

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References 353% CONFIDENCE

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.

[1]50%
en.wikipedia.org/wiki/High_Luminosity_Large_Hadron_Collider
en.wikipedia.org· Posted Sep 11, 2026· Starts Jun 1, 2030 ✓· 87% of score
Given as a target, not a fixed date, per the pin description: "…arch for rare processes into the 2040s. Estimated date.…"
[2]72%
LHC operation and the High-Luminosity LHC upgrade project
arxiv.org· Published May 6, 2025· 13% of score
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.
[3]80%
High-Luminosity Large Hadron Collider (HL-LHC): Technical Design Report
e-publishing.cern.ch· Published Dec 17, 2020· 0% of score
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.

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