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The National High Magnetic Field Laboratory (NHMFL) has designed a high-frequency split-pair coil system for the Los Alamos Neutron Science Center (LANSCE) that can achieve fields up to 30 T and up to 26 T for 10 million cycles in a 20 mm bore and a 5 mm clear split at the midplane. The magnet system pushes the limits of the technology by requiring a nearly clear split, a 2 Hz pulse frequency and a 10 million cycle lifetime. The split is maintained mostly clear except for 14 mm radial thickness of aluminum which helps to support the 147 ton magnetic load between the two coil halves. This nearly clear split allows the neutrons to travel mostly unobstructed from source to detector. The 2 Hz pulse frequency requires that the coils be continuously cooled with de-ionized water flowing at 15 m/s across the inner diameters of each coil. The 10 million cycle lifetime is required due to the number of pulses needed to obtain data in the neutron scattering experiment. As a result, a characterization of conductor and reinforcement materials fatigue properties was performed.
Date of Publication: March 2000