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Fermilab achieves world-record field strength for accelerator magnet

 Fermilab achieves world-record field strength for accelerator magnet
Fermilab recently achieved a magnetic field strength of 1
4.1 at 4.5 kelvins on accelerator steering magnet – a world record. Credit: Thomas Strauss

To build the next generation of powerful proton accelerators, scientists need the strongest magnets possible to steer particles close to the speed of light around a ring. For a given ring size, the higher the beam's energy, the stronger the accelerator's magnets need to be on the beam on course.

Scientists at the Department of Energy's Fermilab have announced that they have achieved the highest magnetic field strength ever recorded for accelerator steering magnet, with the magnet cooled to 4.5 kelvins or minus 450 degrees Fahrenheit. Lawrence Berkeley National Laboratory.

That's more than a thousand times more magnet than the refrigerator that holds your grocery list to your refrigerator.

The achievement is a remarkable milestone for the particle physics community, which is a potential successor to the powerful 17-mile-large Hadron Collider operating at CERN laboratory since 2009. Such a machine would

And that calls for steering magnets that are stronger than the LHC's, about 15 teslas.

"We've been working on breaking the 14-tesla wall for several years, said Fermilab scientist Alexander Zlobin, who leads the project at Fermilab. "We got to 14.1 teslas with our 15-tesla demonstration magnet in its first test."

The success of a future high-energy hadron collider depends crucially on viable high -field magnets, and the international high-energy physics community is encouraging research toward the 15-tesla niobium-tin magnet.

At the heart of the magnet's design is an advanced superconducting material called niobium-tin.

Electrical current flowing through it generates a magnetic field. Because the current encounters no resistance when the material is cooled to very low temperature, it loses no energy and generates no heat. All of the current contributions to the creation of the magnetic field. In other words, you get lots of magnetic bang for the electrical buck.

The strength of the magnetic field depends on the strength of the material. Unlike the niobium-titanium used in the current LHC magnets, niobium-tin can support the amount of current needed to make 15-tesla magnetic fields. But niobium-tin is brittle and susceptible to break when subjected to accelerator magnet.

So the Fermilab team developed a magnet design that would not be able to handle the stress , In a certain way, it enables to meet the requisite electrical and mechanical specifications. These cables were wound in coils and heat-treated at high temperatures for about two weeks, with a peak temperature of about 1,200 degrees Fahrenheit, to convert the niobium-tin wires into superconductor at operation temperatures. Thus, the niobium-tin wires [19659005ThisisatremendousachievementinakeyenablingtechnologyforcircularcollidersbeyondtheLHC"saidSorenPrestemonaseniorscientistatBerkeleyLabanddirectorfromthemultilaboratoryUSMagnetDevelopmentProgramwhichincludestheFermilabteam"Thisisanexceptionalmilestonefortheinternationalcommunitythefrontiersofhigh-energyphysics"

And the Fermilab team is making their mark in the 15-tesla territory. [19659005"Therearemanyvariablestoconsiderinmagneticslikethis:thefieldparameterssuperconductingwireandcablemechanicalstructureanditsperformanceduringassemblyandoperationmagnettechnologyandmagnetprotectionduringoperation"Zlobinsaid

Over the next few months, the group plans to reinforce the coil's mechanical support and then retest the magnet this case. They expect to achieve the 15-tesla design goal.

"Based on the success of this project and the lessons we learned, we're planning to advance the field in niobium-tin magnets for future colliders to 17 tesla, "Zlobin said.

It does not stop there.

The project is supported by the Department of Energy Office of Science. It is a key part of the U.S.. Magnet Development Program, which includes Fermilab, Brookhaven National Laboratory, Lawrence Berkeley National Laboratory and the National High Magnetic Field Laboratory.

New magnet at Fermilab achieves high-field milestone

Provided by
Fermi National Accelerator Laboratory

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                                                 Fermilab achieves world-record field strength for accelerator magnet (2019, September 9)
                                                 retrieved 9 September 2019
                                                 from https://phys.org/news/2019-09-fermilab-world-record-field-strength-magnet.html

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