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Design & Test of a Split Florida-Helix Model

Design & Test of a Split Florida-Helix Model.

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Design & Test of a Split Florida-Helix Model

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  1. Design & Test of a Split Florida-Helix Model In recent years the NHMFL has started to develop high-field powered magnets with configurations other than simple solenoids. Specifically, a preliminary design of a resistive magnet with a mid-plane split for use in far-infrared photon scattering experiments was completed at the conceptual level. This user magnet, to be operated at our own facility, should provide a flux-density in the range of 25-30 T depending on the final gap dimensions using less than 28 MW of dc power. The magnet will include four large scattering ports of elliptical shape at the mid-plane. Such a magnet configuration results in unique design challenges being especially severe for the windings in the mid-plane region of the innermost coils. Consequently, the NHMFL developed a new technology called split Florida-helix. To test and demonstrate those new concepts, the NHMFL recently completed the design, fabrication, and test of a working model of a split Florida-Helix. The working model was tested successfully (in the existing Large Bore Magnet) up to 18 kA and a center field above 32 T (incl. 19.5 T background field). (Core funded) M.D. Bird, Presented at 20th International Conference on Magnet Technology, Philadelphia, Aug 2007

  2. FEA-Aided Design of a Split Florida-Helix Model Advanced 3-D finite element models have been developed at the NHMFL aiding the design optimization of a Split Florida Helix Model. The first model allowed a thermal-electric analysis (in ANSYS) including the evaluation of the current distribution over the four ports at the midplane. A second model (derived from the thermal-electric model) including turn-to-turn stick-slip contact surfaces was used for a non-linear structural analysis (in ANSYS) evaluating the structural performance and stability of the Magnet System. The complex and sophisticated FEA performed proved to be essential for the development of the new split Florida-Helix technology. J. Toth & M.D. Bird, Presented at 20th International Conference on Magnet Technology, Philadelphia, Aug 2007 (Core funded)

  3. SNS Scattering magnet KEK NHMFL NIST CED for 30T Neutron Scattering Magnet We are developing the technology for a new type of magnet suitable for neutron scattering experiments at 30T with a scattering angle of 30 degrees. This magnet will provide a combination of field and solid angle unavailable elsewhere worldwide as shown to the left. A critical part of this is development of the technology suitable for the resistive insert. A coil has been designed as shown to the right. Fabrication is underway. (SNS grant) M.D. Bird et al., Presented at 20th International Conference on Magnet Technology, Philadelphia, Aug 2007

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