Magnets often attract curious minds. Einstein told of his profound sense of hidden order after witnessing the invisible forces of the Earth’s magnetic field guide the needle of a compass. For Ethan Bowers, it was the wonder of learning Maxwell’s laws—equations developed by 19th-century Scottish physicist James Clerk Maxwell that unite magnetism, electricity, and light—that really pulled him in.
Now a Ph.D. student in mechanical engineering, Bowers is building a massive, one-of-a-kind research magnet. It weighs more than 2,300 pounds and will be capable of generating a magnetic field of 7 tesla (roughly 140,000 times stronger than the Earth’s magnetic field and more than twice as strong as the field in most MRI machines).
Making the magnet has been the labor of multiple researchers over more than a decade, led by mechanical engineering associate professor Carlos Romero Talamás, who plans to use the magnet to conduct experiments on plasma, the superheated soup of particles found in stars, lighting, and the Aurora Borealis, and which makes up more than 99 percent of the visible universe.
An initial magnet design and analysis was completed by Evan Bates, M.S. ’15, Ph.D. ’18, mechanical engineering. In 2023, Bowers, who had returned as a student to UMBC following a stint in industry, joined the project. He redesigned key aspects of the magnet and began the meticulous work of assembling and testing it. In the coming months, Bowers plans to run the magnet up to full strength. Then the real fun begins: Unleashing the new tool to help answer the questions curious minds dream up.
Tools of the trade
- Mechanical and electrical know-how
- Perseverance
- Heavy-lifting equipment (custom designed)
- A serious power source and some chilled water (things are going to get hot)
Step 1: Brush up on your magnet basics

Say “magnet,” and many people think first of the objects affixing their kids’ artwork to the fridge. Refrigerator magnets are an example of permanent magnets: materials in which the electrons permanently align in a way that generates a magnetic field. Permanent magnets can get quite strong—such as the rare earth neodymium magnets used in some maglev trains—but they top out at about 2 tesla.
To get an even stronger magnet, engineers can turn to a phenomenon that’s captured in the Maxwell equations that captivated Bowers: Electricity and magnetism are intrinsically linked.
Electrons flowing through a wire generate a magnetic field. Coil the wire and you can create a field similar in shape to a permanent bar magnet, with distinct north and south poles. This is the electromagnet. Higher current and more coils make a stronger magnet. However, high current also risks melting your magnet into a puddle and mangling it with the enormous pressure from the magnetic field pushing on the moving electrons (called Lorentz forces).
Superconducting electromagnets, which use material with the almost magical property of showing virtually zero electrical resistance when cooled with liquid helium, can eliminate the melting risk, but are expensive and finicky to operate, and have other limitations.
Another (more old-school) solution is called the Bitter electromagnet, invented in the 1930s by American physicist Francis Bitter. In place of coiled wires, circular metal disks separated with insulating spacers create a helical path that concentrates the current. The disks are shot through with holes for circulating water to whisk away heat and the structural design counteracts the mechanical stresses. “We chose a Bitter magnet because it offered the right combination of features for the tasks we wanted to perform,” Bowers says.
Step 2: Design, test, refine, repeat

The UMBC team’s initial vision was to create a 10-tesla Bitter magnet, with space in the center for a relatively large vacuum chamber to hold plasma. The magnet could generate either a steady or pulsed magnetic field, depending on the needs of the experiment. Bates analyzed the disk shape, stacking methods, cooling hole geometry, heat transfer, mechanical stress, and electrical properties of the magnet to optimize the design. He validated it by constructing and testing a 1-tesla prototype.
In 2023, the team decided to change the desired magnetic field profile, making it slightly higher on the ends of the magnet than in the middle, so that charged particles would be pushed toward the center. They didn’t want to redesign the Bitter disks, so they had to lower the maximum field strength to 7 tesla. They also had to vary the coil density, making tighter turns at the ends to get the stronger field.
Bowers analyzed the new field profile and worked out a clever trick of adding a tapered insulating disk to seamlessly transition between the areas of tighter and looser turns. He also performed a structural analysis of the whole assembly.
Step 3: Pallets, cranes, and painstaking planning
The final design called for 439 copper Bitter disks, four insulating transition disks, and 434 regular insulating disks housed inside a pressure vessel. Outside companies manufactured the disks, but Bowers personally inspected every single one, removing any with defects, and cleaning the copper ones with isopropyl alcohol. He built a custom pallet to hold the cylindrical assembly in place in the lab, and started stacking.
The process took about a month, and near the end “I was so sick of the monotony,” Bowers says. To push it across the finish line, he worked straight through the weekend, stacking the last disk on a Sunday afternoon in February. “It happened to be my friend’s birthday so I celebrated that completion and their birthday together,” he says.
Next up was moving the approximately 2-foot-high stack of disks to a movable swing set, created by a UMBC mechanical engineering capstone team to serve as a mobile and rotatable platform for the magnet. Bowers built a custom crane fixture to lift the assembly onto the platform and spent weeks planning every step of the move. “It was the last major place the structure could fail before we power the magnet,” he says. After one stressful day, Bowers says he was elated when it all went according to plan. “I felt genuinely grateful for all I had been given the chance to work on, and grateful that God had given me the ability to succeed.”

Step 4: Test some more
With the core of the magnet assembled, Bowers has also begun the detailed process of testing its electrical properties, using a host of measurement equipment.
At first, he is powering the magnet with lower currents, but eventually he will send 15,000 amps through the disks, about half the current that flows in an average lightning bolt. The voltage will be about five times the voltage in a wall socket.
Safety is of paramount concern to the team when working with such high power. When the magnet is operating at full strength, the energy in two cubic feet of the magnetic field alone will be more than the energy of a small SUV zooming by at 60 miles per hour.
Bowers is working on a set of detailed instructions to address all conceivable operating, maintenance, and failure scenarios. “We’re safe. We do all our due diligence,” he says.
Step 5: Serve up some science
Once the magnet is fully up and running, the science experiments can start. Bowers and Romero Talamás have a few ideas for initial experiments, including investigating how a high magnetic field affects when a gas will suddenly switch from being an insulator to a conductor, allowing current to arc through it. They are also interested in how the magnet might be used to separate different forms of hydrogen—particularly two forms that may form the fuel for future fusion reactors to supply clean and near limitless energy.

Bowers grew up in rural Hagarstown, Maryland, a kid who enjoyed exploring everything from the rocks on the side of a path to the electrical motors his grandfather would wind. Research has offered him the chance to constantly challenge himself. After graduation, he’ll move on to new questions at the scientific frontiers, perhaps working at a fusion energy start-up or a national lab. But the 7T Bitter magnet will remain at UMBC, a gift to curious students who come after him.























