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5 Apr 2015


Cern's Large Hadron Collider restarts with sights set on dark matter

Cern confirms successful restart of world’s largest and most powerful atom smasher following upgrade, raising hopes of a ‘new era for science’



The Large Hadron Collider is firing up for the first time since 2013, and scientists are on the hunt for dark matter.

Posted by Newsy on Sunday, April 5, 2015


Switches in the control centre of the Large Hadron Collider. Photograph: DENIS BALIBOUSE/REUTERS

The world’s largest and most powerful atom smasher has been restarted after an upgrade that could see it making scientific history for a second time.

Shortly after 8.30am on Sunday UK time, scientists sent two beams of high-energy particles racing through 16.7 miles of the Large Hadron Collider’s circular underground tunnels.

Cern confirmed that the anti-clockwise beam, B2, had completed a circuit of the machine, passing through all four detectors, at 9.41am.

Confirmation that the restart had been successfully carried out came at 11.27am, as the second, clockwise, beam completed a full circuit of the Large Hadron Collider (LHC).

Cern’s director general, Prof Rolf-Dieter Heuer, who was in the control room, said: “The beam went smoothly through the whole machine. It’s fantastic to see it going so well after two years and such a major overhaul of the LHC. I am delighted and so is everyone in the Cern control centre - as are, I’m sure, colleagues across the high-energy physics community.”

Two years ago the team operating the £3.74bn machine under the Swiss-French border astounded the world with the discovery of the Higgs boson, an elementary particle that gives other particles mass.

Now they have their sights set on an even more exotic trophy: dark matter, the invisible, undetectable material that makes up 84% of matter in the universe and binds galaxies together yet whose nature is unknown.

With its beam energy level raised to 13 tera-electron volts (TeV) it is conceivable that the LHC will capture dark matter, marking a leap forward in our understanding of the universe.

Arnaud Marsollier, from Cern (European Organisation for Nuclear Research) in Geneva, said: “The LHC will be running day and night. When we will get results we don’t know. What is important is that we will have collisions at energies we’ve never had before.

“If something interesting appears in this new window we will see it. It might be two months from now or two years, we’re not able to say. It took 50 years to find the Higgs boson and 20 years to build this machine, and it will be running at least until 2035, so we can be patient.”

A technical hitch had delayed the restart of the LHC after a two-year refit and upgrade almost doubling its power.

An electrical short circuit prompted fears that operations could be put back weeks or even months. But engineers quickly located the problem – a small piece of metal debris – and removed it.

The restart involved relatively weak beams of protons, being sent around the tunnel ring in both directions. But it will be some weeks before the beam energy is ramped up to its target level of 13 TeV.

The first collisions between the particles, marking the start of a new phase of LHC experiments, will not take place until June.

They will take place in four giant detectors placed around the beam ring, triggering the creation of new particles and allowing scientists to peer deep into the fundamental building blocks of nature.

Energy can be converted into mass in accordance with Albert Einstein’s famous equation E (energy) = M (mass) times C (the speed of light) squared. The more energy available, the more massive the particles that can be created.

The search for dark matter involves stepping outside the standard model, the all-encompassing theory that describes the particles and forces of nature that has stood firm for the past 50 years.

A “new physics” model of the universe called supersymmetry predicts that every known particle has a more massive partner – and one of these elusive supersymmetry particles might be the source of dark matter.

At a Cern briefing in Geneva last month, British scientist Prof David Charlton, from the University of Birmingham, who heads the Atlas detector team, said: “We’re heading for unexplored territory. It’s going to be a new era for science.”

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