Commissioning of the 36 T Series-Connected Hybrid Magnet at the NHMFL
| Autor: | William W. Brey, Scott Hannahs, Jefferey L. Schiano, A. Griffin, J. Toth, Ilya M. Litvak, Iain R. Dixon, John Kynoch, Timothy A. Cross, Mark D. Bird |
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| Rok vydání: | 2018 |
| Předmět: |
Resistive touchscreen
Materials science business.industry Superconducting wire Ripple Superconducting magnet engineering.material equipment and supplies 010402 general chemistry Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Inductance Electromagnetic coil Magnet 0103 physical sciences engineering Optoelectronics Electrical and Electronic Engineering 010306 general physics business human activities Current density |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 28:1-6 |
| ISSN: | 1558-2515 1051-8223 |
| Popis: | The National High Magnetic Field Laboratory has commissioned a 36.1 T resistive/superconducting hybrid magnet with homogeneity and stability of 1 ppm over a 10 mm diameter spherical volume to be used for solid-state nuclear magnetic resonance (NMR). Most NMR magnets use single strands of superconducting wire carrying a few hundred amps and persistent joints and switches. This magnet uses a 20 kA superconducting cable in a steel conduit for the outer part of the magnet and copper-alloy sheet metal for the inner part of the magnet. While >15 hybrid magnets have been built worldwide, they typically have a field uniformity of ∼250 ppm/cm DSV and stability might be no better than 50 ppm. To attain 1 ppm uniformity, current density grading was employed in the resistive coils to cancel the z2 term. In addition, coils were shifted after the first map to reduce the z1 term. Ferroshims and resistive shims were installed in the bore to attain |
| Databáze: | OpenAIRE |
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