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  • 2017-02-24 12:05:04
  • Article ID: 670118

A Road Trip to Test a Magnetic Cloak at Argonne National Laboratory

  • Credit: Nils Feege

    Students from Stony Brook University visited Argonne with research professor Nils Feege to test a prototype of a magnetic cloak -- a crucial piece of equipment for a next-generation particle collider – at Argonne’s 4-Tesla Magnet Facility. From left to right: Stacy Karthas, Nils Feege, Thomas Krahulik, Rourke Sekelsky and Joshua LaBounty.

  • Credit: Nils Feege

    Students from Stony Brook University visited Argonne with research professor Nils Feege to test a prototype of a magnetic cloak -- a crucial piece of equipment for a next-generation particle collider – at Argonne’s 4-Tesla Magnet Facility. From left to right: Thomas Krahulik, Nils Feege, Rourke Sekelsky, Joshua LaBounty and Stacy Karthas.

  • Credit: Nils Feege

    The prototype magnetic cloaking device sits in an aluminum box inside the MRI magnet at the 4-Tesla Magnet Facility.

In December, five students from Stony Brook University in New York and their research professor, Nils Feege, loaded a prototype of a magnetic cloak into an SUV and set off for the U.S. Department of Energy’s (DOE) Argonne National Laboratory, nearly 900 miles away.

The magnetic cloak isn’t a magical garment, but rather a crucial piece of equipment for a possible next-generation particle collider to study nuclear physics.

The proposed Electron-Ion Collider, by smashing beams of electrons and protons together at near light speed, would be the most powerful microscope yet developed for understanding how the mass of the proton is dynamically generated from the interaction of quarks and gluons, and in doing so help illuminate the forces that account for the mass of the visible universe.

Such a facility works by directing beams of particles along a track. At the end of the track, the particles collide, and detectors use magnets to pick up the readings from these collisions.

But the incoming particle beams have to be protected from these detector magnets, or else they will be disturbed. So Feege and his team needed to build a cylinder with two counterbalancing layers that would shield the beams from the magnetic field of the detector near the collision point without distorting the rest of the field.

“A superconductor pushes out magnetic field lines, while a ferromagnetic material around it will pull in the field lines; so if you get it exactly right, it will create a field-free tunnel and cancel all outside disturbances,” Feege said.

This creates an area in the detector that is invisible to the magnetic field — like Harry Potter’s invisibility cloak, except for magnetic fields instead of light.

“The other beauty is that it’s passive, which means that it doesn’t require external electrical current. It’s a very elegant solution if you can work it right,” he said.

Feege and his students spent nearly three years building their prototype at Stony Brook. Initial tests looked promising, but they needed to do a full-scale test in a strong and uniform magnetic field that was large enough to fit the device itself while leaving enough room to measure the field around it.

Hence the road trip to Argonne, where the team came to be the first visitors to use a new facility built by Argonne’s high-energy physics division called the 4 Tesla Magnet Facility.

Built out of a recycled hospital MRI magnet to test detector components, the Magnet Facility offers strong, uniform magnetic fields plus a giant hollow center — the only one in the country large enough to accommodate the cloak tests.

“Their setup was extremely useful for our measurements — it allowed us to easily position our sensors and map the magnetic fields,” Feege said.

Happy with the initial results, Feege and his co-lead, Stony Brook professor Abhay Deshpande, are moving forward, talking to accelerator scientists to discuss how the cloak could be integrated into a future collider design.

Though the design is intended for the proposed Electron-Ion Collider, such a cloak would be useful in many types of future colliders, Feege said.

“When we built the Magnet Facility, we had in mind from the start to make it available to the entire physics community,” said Marcel Demarteau, who leads the high-energy physics division at Argonne and helped arrange the team’s trip to the magnet. “We hope this is the beginning of a long and fruitful collaboration in which we capitalize on the synergies between these branches of physics.”

It was a first for a few of the visiting researchers, too. The Stony Brook group’s program makes a point to include undergraduates; at least two dozen undergrads worked on the effort over three years of development, and three of them came along on the Argonne road trip to take the measurements — getting a firsthand look at what science careers actually look like.

“We only had a fixed period of time to do all the tests we needed to do, so as a student you’re learning things like — how do we come up with last-minute solutions to problems that come up on the fly,” Feege said.

“It’s really a fantastic experience for them. I would have loved to have done this as an undergrad,” said Deshpande.

The cloak development is supported by the Electron-Ion Collider Detector R&D initiative administered by Brookhaven National Laboratory. The 4T Magnet Facility has been supported in part by the DOE Office of High Energy Physics in the framework of the g-2 and Mu2e experiments at Fermilab. The students on the team that visited Argonne were Stacy Karthas, Thomas Krahulik, Joshua LaBounty and Rourke Sekelsky.

Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation's first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America's scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy's Office of Science.

The U.S. Department of Energy's Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit the Office of Science website.

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