A joint Fermilab/SLAC publication

Beam is back in the LHC

10/26/09

The first ion beam entering point 2 of the LHC, just before the ALICE detector, on 23 October 2009. Courtesy CERN.

The first ion beam entering point 2 of the LHC, just before the ALICE detector, on 23 October 2009. Courtesy CERN.

CERN reports that beams of protons and lead ions were injected into the Large Hadron Collider this weekend. The beams made a partial tour of the LHC in both directions before being dumped. This marks the first time in more than a year that particles have entered the LHC, and the first time ever that lead ions traveled through part of the LHC.

On Friday, protons and lead ions traveled clockwise through the LHC, passing through the ALICE detector before being dumped. On Saturday, protons traveled counterclockwise through the LHCb detector. These injection tests allow the scientists and engineers working on the LHC to check that the various sectors are prepared for the particle beam and that the beam is stable. Rama Calaga of Brookhaven National Laboratory was among the scientists monitoring the tests. Calaga noted that these tests were “a spectacular success and there were no surprises.”

The CERN news item also has a photo of the first beam of lead ions entering the LHC.

Latest news articles
11/22/21
Gizmodo

The Legacy Survey of Space and Time camera will scan the night sky in high resolution from its perch in Chile.

11/10/21
Gizmodo

An underground experiment in South Korea suggests an intriguing observation from 2017 was a red herring.

11/08/21
Physics Today

A strong sense of community led an early-career string theorist to share preprints in a scientifically competitive environment.

11/07/21
NPR

Manfred Steiner had a successful and productive career as a doctor. But all along, he had a nagging feeling he should be doing something else: studying physics.