Abstract
A scalable concept to prepare high current density windings with high-temperature superconducting material is introduced. The concept covers miniaturized high-current windings and large coils for applications in energy technology as well. The principle is based on a circular disk-up-down-assembly (‘DUDA’) and extended to rectangular coils. First measurements on the assemblies (≈40 turns) in liquid nitrogen are presented as a proof-of-concept. Centre fields of ≈40 mT and ≈340 mT are measured during steady operation and pulsed operation respectively. Operating the assemblies at lower temperatures will strongly increase the current and field performance. Lowering the contact resistance might lead to further improvements. Due to the homogenous structure in the radial direction, shear stresses are minimized and large winding heights can be realized in principle. The DUDA concept of coil windings can be used to build even more sophisticated magnetic arrangements, e.g. Halbach-arrays, or complex windings for new stator configurations of rotating machines. The optional miniaturization offers compact and powerful magnets, e.g. for accelerators too.
Highlights
An early promise of high-temperature superconductors (HTSs) is the generation of high magnetic fields and recent developments in hybrid magnets using 2G-HTS [1], bulk HTS [2] as well as developments in the field and direction of NMR [3, 4] have demonstrated this possibility
Due to the homogenous structure in the radial direction, shear stresses are minimized and large winding heights can be realized in principle
We describe the realization of a similar concept to produce high-magnetic fields by compact circular and rectangular 2G-HTS based assemblies, which are operated by an adjustable excitation current
Summary
An early promise of high-temperature superconductors (HTSs) is the generation of high magnetic fields and recent developments in hybrid magnets using 2G-HTS [1], bulk HTS [2] as well as developments in the field and direction of NMR [3, 4] have demonstrated this possibility. The sequence of different materials and CTE’s in the radial direction [5, 6]. To handle these stresses, a homogeneous architecture in the radial direction would be highly beneficial when building magnets. Other groups studied HTS tapes instead of bulks similar to permanent magnets [8] and in the field of rotating machines [9]. All these approaches have in common that once magnetized the remnant field is hard to deliberately change
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