Common Challenges and goals when using HTS in power engineering and accelerators

In power engineering, the very early projects were based on low-temperature superconductors (LTS). The mandatory low temperature level and the corresponding cooling efforts restricted the use cases of high-power devices (e.g., >1 GW). The availability of high-temperature superconductors (HTS) opened new application regimes of smaller power ratings (starting at abt. 500 kW). However, the balance of HTS performance and cooling effort has to be evaluated for each and every device. For some of the devices an operating temperature in the range of 20…30 K, for others 65…77 K is appropriate. For the practical application, compact high Amp-turn windings have to be prepared. The internal layered architecture of the HTS tapes raises challenges not experienced before in windings of high winding height (high number of turns). There is the quite unique option to use non-insulated HTS-windings, but this will not solve all challenges.
In accelerators, HTS activities are quite limited so far (e.g. HTS-Roebel, HTS-dipoles, HTS-quadrupoles, HTS-undulators).
What is common to power engineering and accelerators (especially a muon collider) is the need to have coils of large dimension, high winding heights, high currents, and low to medium operating temperature. ... mehrFurthermore, the need for non-planar windings is given in power engineering and accelerators.
In this contribution, we discuss the main limits, challenges and how the devices will benefit from developed solutions to these.