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New world record magnet for chemical and biomedical research

Tallahassee, FL The National High Magnetic Field Laboratory, funded by the National Science Foundation and the State of Florida, has achieved another world record in magnet development with the successful testing of its 21.1 Tesla, superconducting, ultra-wide bore, NMR magnet. The magnet reached full field on July 21, 2004, and will remain at field for years -- and even decades -- to come. A team of engineers headed by Denis Markiewicz, Tom Painter, Iain Dixon, and Jim Ferner at the NHMFL developed, designed, manufactured, and tested the magnet system. The product of this 13-year effort stands 16 feet tall, weighs over 30,000 pounds, and has a stored energy of 40 megajoules. No other magnet in the world can produce 21.1 Tesla for NMR and MRI science in a 105 mm warm bore.

NHMFL Director Greg Boebinger said, "This very powerful and ultra-wide bore magnet was an extremely challenging system to build, and it represents a significant engineering accomplishment. It is the crown jewel of the laboratory's NMR spectroscopy and imaging program -- a joint effort between the National High Magnetic Field Laboratory in Tallahassee and in Gainesville." This accomplishment positions the NHMFL as an international leader in the development of high field superconducting magnet technology for magnetic resonance applications.

The magnet is a concentric assembly of ten superconducting coils connected in series and operated at 1.7 K (-456.6 Fahrenheit). Each coil is wound with a monolithic superconductor, composed of either niobium-tin (Nb3Sn) or niobium-titanium (NbTi) filaments in a copper matrix. To support the magnetic loading, the coils are configured with stainless steel overbanding and are vacuum impregnated with cryogenically tough epoxy for structural support. The high current density coils produce a uniform field of 21.1 Tesla to one part in one billion in a volume 64 times larger than that of typical NMR systems. Small adjustments to field homogeneity are achi
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Contact: Tom Painter
public-relations@magnet.fsu.edu
850-644-5752
Florida State University
26-Jul-2004


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