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.
Umfang: VII, 176 S.
Preis: 54.00 €Buchdetails
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.
Umfang: VI, 224 S.
Preis: 49.00 €Buchdetails
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.
Umfang: VII, 220 S.
Preis: 57.00 €Buchdetails
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.
Umfang: X, 120 S.
Preis: 43.00 €Buchdetails
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.
Umfang: XVI, 157 S.
Preis: 52.00 €Buchdetails
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.
Umfang: VII, 171 S.
Preis: 46.00 €Buchdetails
The trend towards larger power ratings of wind turbines asks for innovations in power generation, which requires lower weight and cost, smaller size, higher efficiency and reliability. Due to high current-carrying capability and no DC losses of superconductors, a superconducting wind generator can have a superior power to weight/volume ratio with high efficiency. The work in the book mainly focuses on the feasibility study and design of a superconducting DC wind generator.
Umfang: IX, 204 S.
Preis: 56.00 €Buchdetails
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.
Umfang: 119 S.
Preis: 43.00 €Buchdetails
Superconducting nanowire single-photon detectors (SNSPDs) are very promising as integrated detectors for future quantum photonic integrated circuits. In this work, main technological challenges for the integration of NbN based SNSPDs onto GaAs based phonic circuits are addressed. A new approach to improve the performance of meander style SNSPDs based on a variable thickness is introduced and the first full integration of a quantum photonic chip on a scalable monolithic platform is demonstrated.
Umfang: VIII, 216 S.
Preis: €60.00 | £55.00 | $105.00Buchdetails
Grid appliances, based on superconducting materials, can reduce the threats to power grids posed by lowered grid impedances due to decentralization in grid topology and offer further advantages. This book introduces superconducting materials, the functionality of a superconducting current limiting transformer and the design and optimization process behind such a device. It further presents the manufacturing of a superconducting hybrid transformer of the 1 MVA-class and its experimental testing.
Umfang: IX, 188 S.
Preis: €52.00 | £48.00 | $91.00Buchdetails