as to provide the funds and expertise that will be needed to operate these facilities for users once they are built. (6)

Recommendation: A full photon spectrum, covering at least all of the energies (from radio-frequency to far infrared) associated with accessible fields, should be available for use with high magnetic fields for diagnostics and control. At any point in the spectrum, transform-limited pulses of variable amplitude, allowing access to linear and nonlinear response regimes, should be provided. Consideration should be given to a number of different options, including (1) providing a low-cost spectrum of terahertz radiation sources at the NHMFL, (2) construction of an appropriate free electron laser (FEL) at NHFML, or (3) providing an all-superconducting, high-field magnet at a centralized FEL facility with access to the terahertz radiation band. (6)

Specific Magnet Goals

To maintain its leadership, it is essential that the United States support ambitious goals for the construction of new magnets that would extend the frontiers of high-field research in several directions.

Recommendation: A 40 T all-superconducting magnet should be designed and constructed, building on recent advances in high-temperature superconducting magnet technology. (7)

Recommendation: A 60 T dc hybrid magnet should be designed and built that will capitalize on the success of the current 45 T hybrid magnet at the NHMFL-Tallahassee. (7)

Recommendation: Higher-field pulsed magnets should be developed, together with the necessary instrumentation, in a series of steps, to provide facilities available to users that might eventually extend the current suite of thermal, transport, and optical measurements to fields of 150 T and beyond. (7)

Magnetic Resonance Imaging Magnet Development

Significantly increased field strengths available for MRI and NMR spectroscopy on humans and large animals could enable a number of important advances in medical science. The committee finds that current barriers in MRI medical science research motivate an initiative to develop a 20 T magnet that can image and perform spectroscopy on the human head, large animals, and plants. Although



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement