This work concerns the characterization of high-temperature superconducting REBCO Roebel cables for use in accelerator magnets. The effects of bending, torsion and compressive stress on the cable are investigated. The second part concerns the effect of inter-strand resistance on the cable properties. A two-parameter model is proposed to describe inter-strand connections and predict the effect on AC loss and stability. Additionally, the AC loss and stability are experimentally investigated.

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This work presents a novel use of high-temperature superconductors (HTS) as switches in a fully superconducting H-bridge inverter. Using dynamic resistance under alternating magnetic fields, the switches enable lossless on-state conduction and resistive off-state behavior. Experimental validation, modeling, and a new rDUDA magnetization method support stable dc-ac conversion. The concept is proven at TRL 3-4, with pathways for scaling and practical application.

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This work presents the development and application of high-speed fluorescent thermal imaging for quench analysis in high-temperature superconductors (HTS). Using a fluorescent coating, with a temperature-dependent light emission, temperature changes can be calculated over 2D surfaces. The technique uncovered peculiar transient effects in novel HTS tape architectures and also helped to verify and better understand hot spot development in both insulated and non-insulated, HTS–wound pancake coils.

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High-temperature superconductors have distinct advantages compared to conventional conductors. Below their critical temperature, superconductors have immeasurably low ohmic losses. To maintain the superconducting state, superconductors require constant cooling. This study aims at identifying the environmental impacts of the application of superconductors in future grid technologies such as superconducting power cables.

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A fuel cell-based electric aircraft is considered a long-term solution for medium range flights to reduce aviation Carbon footprint. Equipping its powertrain with superconductivity reduces the weight and spance and increases efficiency. Such a powertrain includes components, such as superconducting fault current limiter, DC/AC cables and motor, and DC/AC inverter. This work presents the approach to model such a powertrain in MATLAB/SIMULINK for simulation in various flight scenarios.

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In dieser Arbeit wurden unterschiedliche, aktuell verfügbare Hochtemperatursupraleiter aus YBa2Cu3O7-x, sogenannte YBCO-Bandleiter, für die Verwendung in supraleitenden resistiven Strombegrenzern systematisch untersucht.Auf Grundlage dieser Untersuchungen wurde ein allgemeiner Entwurfsgang mit zugehörigen Entwurfsgleichungen erstellt sowie ein konzeptioneller Entwurf eines Strombegrenzer-Prototypen für die 10 kV-Mittelspannungsebene durchgeführt mit Abschätzung der Investitionskosten.

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Given the energy transition in Germany, network operators face the challenge of providing reliable energy transmission. The use of superconducting cables represents an alternative for conventional medium- and high-voltage technology. Therefore, this work investigates various high-temperature superconducting multi-conductor concepts for a three-phase medium-voltage cable, aiming to achieve a compact cable design with low electrical losses.

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