CERN’s Full-Scale Test Stand Enters the Powering Phase

Why It Matters

Achieving the HL‑LHC’s luminosity boost will accelerate discoveries in particle physics and cement CERN’s leadership in next‑generation accelerator technology.

Key Takeaways

• CERN begins powering the Inner Triplet test stand for HL‑LHC.
• Full magnet string now receiving nominal current after months of preparation.
• Incremental current ramps will validate integrated upgrade components.
• HL‑LHC aims to boost integrated luminosity tenfold by design.
• Successful test paves way for next‑generation particle physics discoveries.

Summary

CERN announced that the Inner Triplet (IT) string test stand, a full‑scale replica of the magnet chain destined for the High‑Luminosity Large Hadron Collider (HL‑LHC), has entered the powering phase.

After months of assembly and integration, the magnets are now being fed nominal current through their power converters. Engineers are incrementally ramping each circuit, including the corrector magnets, to verify that the upgraded superconducting components operate together as designed.

The team highlighted that the transition from a simple ‘click of a button’ to live current ramps took years of preparation, with real‑time monitoring showing currents rising in the converters and being injected into the magnets. The next steps involve pushing the currents higher until the target levels required for HL‑LHC operation are reached.

If successful, the test will clear a critical hurdle for the HL‑LHC upgrade, which promises a tenfold increase in integrated luminosity, dramatically expanding the data set available for fundamental particle‑physics research.

Original Description

On 20 April 2026, another important milestone was reached for the High-Luminosity Large Hadron Collider (hashtag#HiLumiLHC), with the start of the electrical powering of the 95-metre-long test stand called the Inner Triplet String (IT) String.

Following its successful cryogenic cooldown to 1.9 K (271.3 °C) a few weeks ago, it will be powered up progressively, circuit by circuit, over the next few weeks.

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