Large Hadron Collider restarts

RJM

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Large Hadron Collider restarts
https://home.cern/news/news/accelerators/large-hadron-collider-restarts

22 APRIL, 2022

Beams of protons are again circulating around the collider’s 27-kilometre ring, marking the end of a multiple-year hiatus for upgrade work

The world’s largest and most powerful particle accelerator has restarted after a break of more than three years for maintenance, consolidation and upgrade work. Today, 22 April, at 12:16 CEST, two beams of protons circulated in opposite directions around the Large Hadron Collider’s 27-kilometre ring at their injection energy of 450 billion electronvolts (450 GeV).

“These beams circulated at injection energy and contained a relatively small number of protons. High-intensity, high-energy collisions are a couple of months away,” says the Head of CERN’s Beams department, Rhodri Jones. “But first beams represent the successful restart of the accelerator after all the hard work of the long shutdown.”

“The machines and facilities underwent major upgrades during the second long shutdown of CERN’s accelerator complex,” says CERN’s Director for Accelerators and Technology, Mike Lamont. “The LHC itself has undergone an extensive consolidation programme and will now operate at an even higher energy and, thanks to major improvements in the injector complex, it will deliver significantly more data to the upgraded LHC experiments.”

Pilot beams circulated in the LHC for a brief period in October 2021. However, the beams that circulated today mark not only the end of the second long shutdown for the LHC but also the beginning of preparations for four years of physics-data taking, which is expected to start this summer.

Until then, LHC experts will work around the clock to progressively recommission the machine and safely ramp up the energy and intensity of the beams before delivering collisions to the experiments at a record energy of 13.6 trillion electronvolts (13.6 TeV).

This third run of the LHC, called Run 3, will see the machine’s experiments collecting data from collisions not only at a record energy but also in unparalleled numbers. The ATLAS and CMS experiments can each expect to receive more collisions during this physics run than in the two previous physics runs combined, while LHCb, which underwent a complete revamp during the shutdown, can hope to see its collision count increase by a factor of three. Meanwhile, ALICE, a specialised detector for studying heavy-ion collisions, can expect a fifty times increase in the total number of recorded ion collisions, thanks to the recent completion of a major upgrade.

The unprecedented number of collisions will allow international teams of physicists at CERN and across the world to study the Higgs boson in great detail and put the Standard Model of particle physics and its various extensions to the most stringent tests yet.

Other things to look forward to in Run 3 include the operation of two new experiments, FASER and SND@LHC, designed to look for physics beyond the Standard Model; special proton–helium collisions to measure how often the antimatter counterparts of protons are produced in these collisions; and collisions involving oxygen ions that will improve physicists’ knowledge of cosmic-ray physics and the quark–gluon plasma, a state of matter that existed shortly after the Big Bang.

Videos:
VNR: https://videos.cern.ch/record/2295778
The LS2 upgrades to the LHC detectors: https://videos.cern.ch/record/2295775
The LS2 upgrades to the CERN accelerators chain: https://videos.cern.ch/record/2295776
The LHC and the accelerator complex: here

Photos:
Photos of the restart: https://cds.cern.ch/record/2807018
The accelerator complex: https://home.cern/resources/image/accelerators/accelerator-complex-images-gallery
The LHC: https://home.cern/resources/image/accelerators/lhc-images-gallery

Media kit:
https://home.cern/press/2022
 

Nicholas Weeks

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Bad news for the planet. No good reason to give, just all those beams cutting into the aura of our Earth in the name of "science" reminds me that the Law of Unintended Consequences still is in effect.
 

Cino

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Bad news for the planet. No good reason to give, just all those beams cutting into the aura of our Earth in the name of "science" reminds me that the Law of Unintended Consequences still is in effect.

To my understanding, in a purely physical sense, it's not that much different from an old-fashioned CRT monitor. Bigger, a lot more oomph, and the particles go in a circle (or strictly, a polygon) rather than on a straight path, but compared to planetary scales, they not that different from each other. Similar effects happen in the stratosphere at a much larger scale, resulting in the Aurora Borealis, which I always felt was supremely beautiful and sublime. CERN can't compare in that dimension, it would be like a flickering neon sign next to the Aurora.

Many unethical things have been done and continue to be done in the name of scientific progress - vivisection and other animal experiments, serious environmental pollution, psychological torture... the LHC and other experiments of high-energy physics never struck me as particularly problematic, but maybe I have a blind spot there, since I was for a few years part of the field.

Not trying to talk away your concerns, just giving my perspective.
 

RJM

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Bad news for the planet. No good reason to give, just all those beams cutting into the aura of our Earth in the name of "science" reminds me that the Law of Unintended Consequences still is in effect.
IMO it's non-commercial research like this that enables the technology we use to communicate, and much else besides. I don't think the LHC beam is cutting into anything, running in a tightly controlled and carefully sheilded magnetic circle.
Many unethical things have been done and continue to be done in the name of scientific progress - vivisection and other animal experiments, serious environmental pollution, psychological torture... the LHC and other experiments of high-energy physics never struck me as particularly problematic
Good observation
 

Ella S.

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Do you think Satan uses Bitcoin? Once CERN opens up the portal to Hell, we could make a killing selling A/C units to the damned.
 
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Cino

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Do you think Satan uses Bitcoin? Once CERN opens up the portal to Hell, we could make a killing selling A/C units to the damned.

I think Satan is too smart for Bitcoin ;) The kind of blunders and smart contracts locking up and millions getting stolen... I mean ... (gestures)
 
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