Two beams of protons have circulated in opposite directions through the particle accelerator with an energy injection of 450 billion electron volts. What does this mean? That the Large Hadron Collider , the LHC, has restarted successfully after the three-year shutdown period in which maintenance, consolidation and modernization work has been carried out on the large ring-shaped tube that covers 27 kilometers long and is located about 80 meters underground.
“These beams circulated with injection energy and contained a relatively small number of protons. High-intensity, high-energy collisions are a couple of months away,” CERN’s Rhodri Jones explained in a statement. “But the first rays represent the successful restart of the throttle after all the hard work of the long stop.”
Now the instruments are more sensitive
The LHC works by colliding atoms to separate them and discover the subatomic particles that exist inside them and how they interact. Now, thanks to this collider update, the instruments are more sensitive.
This will give scientists the opportunity to have a higher resolution view inside atoms, capturing data 30 million times per second, and allow for more runs. It will also make it possible to search for rare phenomena and address questions such as how the Higgs boson interacts with itself.
It has not been an easy process, as getting the entire collider up and running again requires everything to “work like an orchestra”, especially after the extended shutdown due to Covid-19. Since it’s not about pushing a button, a lot can go wrong, including blockages in the tunnel and problems with the magnets.
During the long shutdown, 22 magnets were replaced and additional cooling systems added , among other changes. Perhaps the biggest change is that CERN’s accelerator complex will no longer be powered by protons, but by negatively charged hydrogen ions, each made up of one proton and two electrons. As the ions are injected, the electrons are removed, leaving only the protons. These protons will be attached to more negatively charged hydrogen ions, which will undergo the same process. By repeatedly entwining negative and positive ions, scientists can create tightly packed groups of protons. A more compact proton beam will mean more particle collisions per second.
In search of the fifth force of nature
Particle physicists hope that all these arrangements, and the increased sensitivity of the instruments, will allow the discovery of a new fundamental force of nature, which would add to the four basic forces (gravitational, electromagnetic, strong and weak) and help to explain the foundations of the universe. And the dark matter? It is another pending issue in which this large hadron collider could lend us a hand.
It is the most powerful particle accelerator in the world. Given its complex operation and need for improvement, its activity is carried out in several phases after long stops for its fine-tuning and implementation of new advances. This is the Run3 . Therefore, more collisions are expected in Run 3 than in the previous two combined, and also that A Large Ion Collider Experiment (ALICE), registers 50 times more collisions of heavy ions in which it specializes than before.
With the first proton beams fired, the CERN team will now work to fully bring the LHC back into service over the next few months. When fully operational, it will produce particle collisions at a record energy of 13.6 TeV.
Teams from around the world have helped the Large Hadron Collider reach unprecedented energy levels for its third physical run.
Reference: CERN home.web.cern.ch/news/news/accelerators/large-hadron-collider-restarts
