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• W3136243561 abstract "The charging/discharging delays in superconducting coils wound without insulation (NI coils) are a major drawback of the technique. While removing the insulation improves safety margins, the increase in the characteristic time constant τ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> can make a coil unfit for a particular purpose. It is widely accepted for instance that NI coils will not be used in ac applications where τ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> ~ 1/f. To decrease τ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> of the NI coils, the same length of superconductor can be wound/connected in parallel rather than in series - decreasing the inductance L, and hence the time constant τ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> , while maintaining the number of amp-turns I <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>op</sub> N. Here we investigate the effect of parallel connecting coils in a magnet using a 2D axially symmetric model which captures all the necessary electromagnetic properties of the HTS NI coils. These properties include: critical current anisotropy J <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</sub> (B,θ), turn-to-turn conductivity, as well as winding parallelism. Our modeling results show that the parallel connected magnet experiences magnet-wide shielding current effects. Whilst these shielding currents affect field homogeneity - the model enables this effect to be quantified. Furthermore, shielding currents are not an issue when running NI coils in saturated mode. The modeling work presented here provides a simple initial example of how magnet designers may approach designing, optimizing, and operating high current, HTS NI coils." @default.
• W3136243561 created "2021-03-29" @default.
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• W3136243561 date "2021-08-01" @default.
• W3136243561 modified "2023-09-24" @default.
• W3136243561 title "Modelling Parallel-Connected, No-Insulation High-${rm T}_c$ Superconducting Magnets" @default.
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• W3136243561 doi "https://doi.org/10.1109/tasc.2021.3065284" @default.
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