US Physicists make world's strongest magnet

Washington, January 9 (ANI): Physicists at the National High Magnetic Field Laboratory at The Florida State University, US, have reclaimed their record of developing the world's strongest magnet.

Engineers and technicians at the place in late December completed testing of a 36-tesla magnet.

This achievement reestablishes the magnet lab as the world-record holder for the highest-field "resistive" magnet - a type of electromagnet that uses electricity to generate high magnetic fields.

The new magnet, which is actually an upgrade to an existing one, bests the previous record of 35 tesla, jointly held by the magnet lab and the Grenoble High Magnetic Field Laboratory in France.

"This latest world record is a credit to the ingenuity of the magnet lab's engineers," said Nathanael Fortune, chairman of the National High Magnetic Field Laboratory's User Committee and an associate professor of physics at Smith College in Massachusetts.

Because of the limits of available materials (both to conduct current and to minimize stress on the coils), engineers were stuck at 35 tesla for about four years.

But, magnet lab engineers discovered that by adjusting the stacking pattern of the Bitter plates, they could increase the magnetic field without increasing stress on the coils.

This cost-neutral modification means a higher magnetic field can be created using the same amount of power, 20 megawatts.

The 36-tesla magnet, which has a 32-millimeter (1.25-inch) experimental space, will be used primarily for physics and materials science research.

According to Jingping Chen, manager of the resistive magnet program at the magnet lab, the upgrade of the magnet is just a start, and that major upgrades are planned for many of the resistive magnets at the laboratory.

"We believe this magnet has the potential to reach even higher fields," Chen said.

"We plan to upgrade our other 35-tesla magnet this year as well. And our wider-bore, 31-tesla magnets will be upgraded to around 33 tesla - which will be a new record in the 50-millimeter (1.97-inch) category," he added.

Resistive magnets are built in-house at the magnet lab using so-called Florida Bitter technology pioneered by researchers there.

Circular plates of copper sheet metal are stamped with cooling holes; insulators with the same pattern are placed between the plates and stacked to make a coil.

Voltage is then run across the coil and current flows to make a magnetic field in the center. (ANI)