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Thursday, 14 July 2011

25T World-record Split Magnet system makes its debut

National High Magnetic Field Laboratory
July 6, 2011


Optics, nanoscience and semiconductor research will receive a boost this summer with the debut of the National High Magnetic Field Laboratory's Split Magnet system, a custom-built, $2.5-million instrument with the potential to (literally) open up high-field magnet research. The magnet is successfully operating at 25 tesla; the standing record for this type of magnet was 17.5 tesla. The project is funded by the National Science Foundation.

The magnet's design required engineers to rethink the structural limits of resistive magnets, then invent, patent and find (sometimes elusive) builders for the technology that could carry their idea through. The Split Magnet features four large elliptical ports that enable scientists direct, horizontal access to the magnet's central experimental space, or bore, while maintaining a high magnetic field. "Tesla" is a measurement of the strength of a magnetic field; 1 tesla is equal to 20,000 times the Earth's magnetic field.

"We're excited for the opportunity to share this magnet's capabilities with our user community," said Eric Palm, director of the Direct Current User Program. "Among other research possibilities, the Split Magnet will allow optics researchers unprecedented access to their samples, improve the quality of their data, and enable new types of experiments."

Split magnets are typically lower-field, less efficient systems with pencil-sized access ports. The elliptical-shaped ports visible in the accompanying photo enlarge the previously pencil-sized access for experiments by several hundredfold, a capability the laboratory's user community has long desired.

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