Opportunities in High Magnetic Field Science (2005) / Chapter Skim
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1 Introduction
1 Introduction
Pages 7-13
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From page 7... ...
In 1819, H.C. Oersted discovered that electric currents engender magnetic fields, and a few years later, M
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High-field magnets are used to control particle trajectories in accelerators, and over the years, the interest of the high-energy physics community in increasing the energies at which accelerators operate has been a powerful driver of magnet technology. THE SIGNIFICANCE OF HIGH MAGNETIC FIELD RESEARCH Most of the magnetic devices important to the public do not generate high fields, MRI being the exception.
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From page 9... ...
assessing the current state and future prospects of high-field magnetic 1See, for example, National Research Council, High-Magnetic-Field Research and Facilities, Washington, D.C., National Academy Press, 1979; and National Science Foundation, Final Report of NSF Panel on Large Magnetic Fields, Arlington, Va., National Science Foundation, 1988.
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From page 10... ...
HIGH-FIELD MAGNETS As already noted, the construction of high-field magnets has always posed engineering challenges. Solenoids generating fields of about 2 T were built in the 19th century using resistive conductors, and even at fields that low, both the mechanical strength of the materials used and heating were issues.
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From page 11... ...
In addition, once energized, superconducting magnets consume no power and do not have to be connected permanently to a power supply. However, it was soon discovered that no matter how cold they are, the metals in which superconductivity was first demonstrated become resistive when exposed to magnetic fields much lower than those generated by the resistive electromagnets of the day.
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From page 12... ...
They are very interesting to magnet designers, however, because their critical fields are far higher than those of any of the superconductors now routinely used for magnet fabrication. The technical challenges they pose are being overcome, so the field strengths that can be obtained from superconducting magnets are likely to increase significantly in the next few years.
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From page 13... ...
The committee's deci sion to write at this level was made following discussions with the NSF. The body of this report begins with an overview of the science that is being done using high field magnets and the science opportunities and challenges that might open up if higher-field magnets were developed.
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