Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"Superconducting devices"”.
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Magnesium Diboride Superconducting Devices and Circuits
… not discovered until 2001. It has the highest superconducting transition temperature of all the metallic superconductors at ~39 K at atmospheric pressure. MgB2 is also unique in that it has a two superconductive gaps, a pi gap at 2 meV and a sigma gap at 7.1 meV. There are a theoretical models …
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Focused Ion Beam Fabricated Non-equilibrium Superconducting Devices
… on the use of an FIB instrument for making superconducting devices. It is shown for the first time that planar-bridge (Nb/Cu/Nb) Superconductor/Normalmetal/ Superconductor (SNS) junctions can be reliably fabricated using a standard FIB instrument. This is demonstrated by the responses of …
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Thermal activation and macroscopic quantum phenomena in superconducting devices
… wells in one and two dimensional potentials of superconducting devices. We have measured escape rates due to both thermal activation over the barrier and macroscopic quantum tunneling through the barrier. The measurements were performed for a variety of device parameters, corresponding to …
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Nonequilibrium excitations in superconducting aluminum and high-temperature superconducting devices
… previously unmeasured non-equilibrium effect in superconducting aluminum. A charge imbalance, or charging of the normal fluid with respect to the superfluid, is generated by the interaction of an electric field and a supercurrent. We have shown that this effect does occur, however the measured …
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Modification of Iron pnictide and MgB2 thin films using focused He+ ion beam irradiation for superconducting devices
Continued pursuit of better superconducting devices and an understanding of how the focused ion beam evolves in a complex material are the primary motivations behind this work. The materials of interest are MgB2 and Co-doped Ba122. Superconducting properties of MgB2 were discovered in 2001. It is …
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Superconducting thin film nanoelectronics
Superconducting devices have found application in a diverse set of fields due to their unique properties which cannot be reproduced in normal materials. Although many of these devices rely on the properties of bulk superconductors, superconducting devices based on thin films are finding increasing …
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Ab initio modeling of superconducting nanowire single-photon detectors
… and computing technology. Among these detectors, superconducting nanowire single-photon detectors (SNSPDs) possess the highest detection efficiencies, the shortest timing jitter, and the lowest dark count rates. However, for several applications, including those in the biological, astronomical, …
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Beam-Induced Radiation Heating on the Superconducting Undulator at the Advanced Photon Source
… a 7 GeV synchrotron X-ray source, commissioned a Superconducting Undulator (SCU). The superconducting magnet is thermally isolated from the beam vacuum chamber, which absorbs the beam-induced heating. Previous beam induced heat load studies at other laboratories had not included a robust …
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Cryogenic characteristics of IGBTs
Applications are now starting to emerge for superconducting devices in the areas of electrical power conversion and management, for example superconducting windings for marine propulsion motors, superconducting fault current limiters and superconducting magnet energy storage (SMES). Many of these …
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Reactive DC magnetron sputtering of ultrathin superconducting niobium nitride films
… films of niobium nitride for fabrication of superconducting devices. Over 1000 samples were deposited on a variety of substrates, under various chamber conditions. Sheet resistance, thickness and superconducting critical temperature were measured for a large number of samples. Film Tc was …
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Microwave response of nonlinear oscillations in resistively shunted superconducting nanowires
Many superconducting technologies such as rapid single flux quantum computing (RSFQ) and superconducting quantum interference devices (SQUIDs) rely on the modulation of nonlinear dynamics in Josephson junctions for functionality. More recently, however, superconducting devices have been developed …
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Electromagnetically Induced Transparency and electron spin dynamics using superconducting quantum circuits
This thesis is an exploration on superconducting devices, quantum optics, and magnetic resonance. Superconductive quantum circuits (SQC) comprising mesoscopic Josephson junctions can exhibit quantum coherence amongst their macroscopically large degrees of freedom. They feature quantized flux and/or …
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Efficient simulation of Large-Scale Superconducting Nanowire Circuits
As the size of superconducting nanowire devices increases and the influence of second-order effects, such as thermal or electrostatic coupling, becomes more significant, the complexity of models required to accurately and efficiently simulate the device’s behavior becomes more challenging. …
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Design and optimisation of a coreless superconducting synchronous generator
… answer to these problems is believed to be in superconducting machines.<br/><br/>After short introduction to the phenomena of superconductivity and superconducting devices, practical superconducting tapes are described. The evolution and problems considered during the design of a coreless …
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Dynamic Resistance of High-Tc Superconductor and Its Application in Flux Pumped Superconducting Magnets
… DC current with little power loss. Hence, superconducting magnets are already widely used in areas such as magnetic resonance imaging (MRI), particle accelerators, and magnetic levitation systems. Flux pumping is a promising technology for energizing and operating High-Tc superconducting …
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Construction of a superconducting circuit simulator and its applications in cryogenic computing
… construct a unified simulation platform, where superconducting electronics can be designed and optimized with high performance and accuracy. For this purpose, I first select numerical simulation methods that can deal with the highly non-linear characteristics of the superconducting devices. I …
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Macroscopic quantum tunneling in superconducting nanowire devices
… macroscopic quantum tunneling of phase-slips in superconducting devices, including one-dimensional nanowires, quasi-two-dimensional superconducting strips and doubly connected superconducting devices composed of two nanowires connected in parallel. We observe macroscopic quantum tunneling in …
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Multimode Circuit Quantum Electrodynamics With Superconducting Metamaterial Resonators
<p>Superconducting devices in circuit quantum electrodynamics (cQED) systems are one of the leading approaches for realizing scalable quantum information processors. The combination of cQED architectures with multimode resonator systems can provide a flexible platform for performing analog quantum …
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Josephson Effects in the Iron-Based Superconductor FeTe$_{1-x}$Se$_{x}$
… among others. Despite the interest in superconducting devices based on FeTe$_{1-x}$Se$_x$, there have been relatively few demonstrations of Josephson junctions in FeTe$_{1-x}$Se$_x$-based systems. In this dissertation we measured Josephson effects in a FeTe$_{1-x}$Se$_x$-based device …
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Scaling of Nanocryotron Superconducting Logic
… presents the design and characterization of a superconducting shift register based on nanocryotrons. Such a shift register has applications in nanocryotron circuit testing as well as integrated readout and memory for high count rate imagers based on superconducting nanowire single photon …
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