Ihre Suche ergab 22 Treffer.
Optimization of Hot-Electron Bolometers for THz Radiation
Produktform: Buch / Einband - flex.(Paperback)
Hot-electron bolometers are fast and low noise radiation detectors which can be used for many different applications. The aim of this work was to optimize the fabrication process of hot-electron bolometers and gain a deeper understanding of the underlying processes. To achieve this, the fabrication of the superconducting thin films was optimized and the superconducting properties of the films were analyzed. Detectors fabricated using the results showed a record value for the noise temperature.
48,00 € inkl. MwSt.
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Simulationen und Experimente zum Stabilitätsverhalten von HTSL-Bandleitern
Produktform: Buch / Einband - flex.(Paperback)
In der vorliegenden Arbeit wurde das Aufwärm- und Rückkühlverhalten verschiedener HTSL-Bandleiter systematisch durch Experimente und Simulationen untersucht. Verschiedene Simulationsmodelle werden vorgestellt und auf ihre Eignung zur Nachbildung der typisch auftretenden Vorgänge im Supraleiter überprüft. Daraus werden Empfehlungen für geeignete Simulationsmodelle abgeleitet. Durch die Variation einzelner Parameter werden verschiedene Einflüsse auf das Übergangsverhalten des Leiters untersucht.
56,00 € inkl. MwSt.
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High Temperature Superconductor Cable Concepts for Fusion Magnets
Produktform: Buch / Einband - flex.(Paperback)
Three concepts of high temperature superconductor cables carrying kA currents (RACC, CORC and TSTC) are investigated, optimized and evaluated in the scope of their applicability as conductor in fusion magnets. The magnetic field and temperature dependence of the cables is measured; the thermal expansion and conductivity of structure, insulation and filling materials are investigated. High temperature superconductor winding packs for fusion magnets are calculated and compared with corresponding low temperature superconductor cases.
62,00 € inkl. MwSt.
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lieferbar - Lieferzeit 10-15 Werktage
Ultra-fast YBa2Cu3O7-x direct detectors for the THz frequency range
Produktform: Buch / Einband - flex.(Paperback)
For the analysis and optimization of the picosecond pulsed terahertz radiation generated by electron storage rings or other pulsed sources, ultra-fast detectors are required which are able to resolve picosecond dynamic processes directly in the time domain. In this book, a new direct terahertz detector technology based on the high-temperature superconductor YBa2Cu3O7-x has been developed which opens new routes in the analysis of picosecond time-domain processes with a wide dynamic range.
53,00 € inkl. MwSt.
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Simulations for the optimization of High Temperatur Superconductor current leads for nuclear fusion applications
Produktform: Buch / Einband - flex.(Paperback)
Techniques based on numerical simulations have been applied to the analysis of the heat exchanger and the High Temperature Superconductor (HTS) module of HTS current leads. In the first case correlations have been derived for the meander flow geometry. In the second case steady state and transient thermal-electric models have been validated. Both techniques are used to design and optimize HTS current leads. The correlations were applied to a predictive analysis of the ITER HTS current leads.
60,00 € inkl. MwSt.
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Optimisation of hysteretic losses in high-temperature superconducting wires
Produktform: Buch / Einband - flex.(Paperback)
Hysteretic loss optimisations through numerical simulation and subsequent experimental confirmation in transport current and background field measurements: ferromagnetic shielding and topological geometry optimisation is used to reduce energy dissipation in HTS coated conductor geometries. Single tapes and coil geometries are investigated. A 3D model capable of taking into account contact resistances is also presented for the Twisted Stacked Tape Conductor cable.
61,00 € inkl. MwSt.
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Influence of Material and Geometry on the Performance of Superconducting Nanowire Single-Photon Detectors
Produktform: Buch / Einband - flex.(Paperback)
Superconducting Nanowire Single-Photon Detectors offer the capability to detect electromagnetic waves on a single photon level in a wavelength range that far exceeds that of alternative detector types. However, above a certain threshold wavelength, the efficiency of those detectors decreases stronlgy, leading to a poor performance in the far-infrared range. Influences on this threshold are studied and approaches for improvement are verified experimentally by measurement of the device performance.
60,00 € inkl. MwSt.
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High quality Nb/Al-AlOx/Nb Josephson junctions : technological development and macroscopic quantum experiments
Produktform: Buch / Einband - flex.(Paperback)
Diese Arbeit beschreibt die Entwicklung einer Technologie für die Herstellung hochqualitativer sub-µm Nb/Al-AlOx/Nb-Josephson-Kontakte. Mit den dadurch entstandenen Bauteilen wurden verschiedene experimentell zuvor noch nicht beobachtete makroskopische Quanteneffekte nachgewiesen. Weiterhin wurden Nb-basierte Phasen-Qubits entworfen, hergestellt und gemessen, die längere Kohärenzzeiten als vergleichbare Bauelemente aus der Literatur aufweisen.
53,00 € inkl. MwSt.
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Ultrabreitbandige Strahlungseinkopplung in THz-Detektoren
Produktform: Buch / Einband - flex.(Paperback)
Bolometrische Detektoren bieten vielversprechende Eigenschaften für den messtechnischen Nachweis von THz-Strahlung. Um eine effiziente Einkopplung der THz-Strahlung in den Detektor zu gewährleisten, wurden in dieser Arbeit ultrabreitbandige Antennenstrukturen entwickelt. Unter Verwendung dieser Strukturen wurde es möglich, ultrakurze THz-Impulse im Bereich weniger Pikosekunden zeitlich aufzulösen sowie spezifische Transienteneffekte erstmalig messtechnisch nachzuweisen.
65,00 € inkl. MwSt.
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Development of lumped element kinetic inductance detectors for mm-wave astronomy at the IRAM 30 m telescope
Produktform: Buch / Einband - flex.(Paperback)
This thesis studies the development of LEKID arrays for the use in a mm-wave camera for the IRAM 30m telescope. This includes the design and fabrication of the superconducting microresonators, the modeling and optimization of the mm-wave coupling to the detector and the characterization of the arrays at low temperatures. The results obtained brought IRAM to test a prototype instrument at the telescope, where first astronomical results have been achieved, which are also presented in this work.
38,00 € inkl. MwSt.
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lieferbar - Lieferzeit 10-15 Werktage