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Development of high-temperature superconductor cables for high direct current applications
A design process for HTS DC cables was developed for high current applications. Based on the design process, a 35 kA HTS DC cable demonstrator was developed. The superconducting elements of the demonstrator were manufactured and tested individually at 77 K. Afterwards, the demonstrator cable was assembled and tested at 77 K. The assembled demonstrator successfully reached 35 kA at 77 K and self field conditions.
Fluorescent thermal imaging method for investigating transient effects in high-temperature superconductor tapes and coils
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.
Evaluation of the Use of Superconducting 380 kV Cable
Diese Studie führt eine Auslegung von supraleitenden Kabeln für die Anwendung im 380-kV-Drehstromnetz durch und erläutert allgemeine Aspekte des Einsatzes solcher Kabel im Höchstspannungsnetz. Dabei vergleicht sie die Supraleitungstechnologie unter vielen verschiedenen Kriterien mit anderen Leitungstechnologien. - This study describes the design of superconducting cables for use in the 380 kV three-phase network and explains general aspects of the use of such cables in the extra-high voltage grid. It compares the superconducting technology with other line technologies under many different criteria.
Prospective Life Cycle Assessment of High-Temperature Superconductors for Future Grid Applications
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.
Technology and readout for scaling up superconducting nanowire single-photon detectors
This work presents three advances to scale SNSPDs from few-pixel devices to large detector arrays: atomic layer deposition for the fabrication of uniform superconducting niobium nitride films of few-nanometer thickness, a frequency-multiplexing scheme to operate multiple detectors with a reduced number of lines, and the integration of SNSPDs with free-form polymer structures to achieve efficient optical coupling onto the active area of the detectors.
AC Losses in High-Temperature Superconductor Tapes and Cables for Power Applications
This work focuses on two topics. The first is the investigation of producing filaments on copper-stabilized coated conductors, with striations made after or before electroplating the tape. The second topic is the applicability of the striations for reducing the AC losses of cables, in particular the CORC® and RACC cables, which are made with high-temperature superconductor (HTS) striated tapes.
Integrierte planare Antennen für supraleitende Detektorsysteme zur THz-Strahldiagnostik
Antennengekoppelte supraleitende Detektoren weisen im THz-Bereich die notwendige Eignung zum Einsatz in der Strahldiagnostik von als Lichtquellen betriebenen Teilchenbeschleunigern auf. Diese Arbeit behandelt die Rolle der Antenne als Koppel- und Filterglied und den Entwurf zweier mehrkanaliger Detektorsystemen für spektroskopische Messanwendungen. In verschiedenen Messungen an Beschleunigerquellen konnten die erarbeiteten Konzepte verifiziert und die Eignung gezeigt werden. - In the THz frequency range, superconducting detectors coupled to planar antennas are well suited for the use in the field of accelerator beam diagnostics. This work studies the coupling efficiency and spectral sensitivity of different antenna designs. Based on the conclusions, two different detector systems for spectroscopic measurements are developed and verified with measurements at accelerator-based light sources.
Learning Empire
The First World War marked the end point of a process of German globalization that began in the 1870s. Learning Empire looks at German worldwide entanglements to recast how we interpret German imperialism, the origins of the First World War, and the rise of Nazism.
Germany’s Urban Frontiers
In an era of transatlantic migration, Germans were fascinated by the myth of the frontier. Yet, for many, they were most likely to encounter frontier landscapes of new settlement and the taming of nature not in far-flung landscapes abroad, but on the edges of Germany’s many growing cities. Germany’s Urban Frontiers is the first book to examine how nineteenth-century notions of progress, community, and nature shaped the changing spaces of German urban peripheries as the walls and boundaries that had so long defined central European cities disappeared. Through a series of local case studies including Leipzig, Oldenburg, and Berlin, Kristin Poling reveals how Germans on the edge of the city confronted not only questions of planning and control, but also their own histories and futures as a community.
