Real-time imaging systems for superconducting nanowire single-photon detector arrays
Real-time imaging systems for superconducting nanowire single-photon detector arrays

Author: Hofherr, Matthias

Publisher: KIT Scientific Publishing

Published: 2014-09-26

Total Pages: 216

ISBN-13: 3731502291

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Superconducting nanowire singe-photon detectors (SNSPD) are promising detectors in the field of applications, where single-photon resolution is required like in quantum optics, spectroscopy or astronomy. These cryogenic detectors gain from a broad spectrum in the optical and infrared range and deliver low dark count rates and low jitter times. This thesis improves the understanding of the detection mechanism of SNSPDs and intodruces new and promising multi-pixel readout concepts.

Real-time Imaging Systems for Superconducting Nanowire Single-photon Detector Arrays
Real-time Imaging Systems for Superconducting Nanowire Single-photon Detector Arrays

Author: Matthias Hofherr

Publisher:

Published: 2020-10-09

Total Pages: 208

ISBN-13: 9781013279614

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Superconducting nanowire singe-photon detectors (SNSPD) are promising detectors in the field of applications, where single-photon resolution is required like in quantum optics, spectroscopy or astronomy. These cryogenic detectors gain from a broad spectrum in the optical and infrared range and deliver low dark count rates and low jitter times. This thesis improves the understanding of the detection mechanism of SNSPDs and intodruces new and promising multi-pixel readout concepts. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.

Technology and readout for scaling up superconducting nanowire single-photon detectors
Technology and readout for scaling up superconducting nanowire single-photon detectors

Author: Knehr, Emanuel Marius

Publisher: KIT Scientific Publishing

Published: 2023-03-02

Total Pages: 200

ISBN-13: 3731512564

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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.

Electrical-field sensitive YBa₂Cu₃O₇₋ₓ detectors for real-time monitoring of picosecond THz pulses
Electrical-field sensitive YBa₂Cu₃O₇₋ₓ detectors for real-time monitoring of picosecond THz pulses

Author: Raasch, Juliane

Publisher: KIT Scientific Publishing

Published: 2019-04-23

Total Pages: 226

ISBN-13: 3731507862

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This work investigates the capability of the high-temperature superconductor YBCO to sense the evolution of the electrical field of THz pulses. A deposition process for ten unit-cell thin films and a sub-μm patterning process were developed to enable high sensitivities. The detector response to THz exctiations and its electrical-field sensitivity were studied. This unique characteristic allows for the investigation of instabilities of the THz radiation emitted from synchrotron storage rings.

Improving the Spectral Bandwidth of Superconducting Nanowire Single-Photon Detectors (SNSPDs)
Improving the Spectral Bandwidth of Superconducting Nanowire Single-Photon Detectors (SNSPDs)

Author: Charaev, Ilya

Publisher: KIT Scientific Publishing

Published: 2018-07-31

Total Pages: 176

ISBN-13: 3731507455

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This work presents a comprehensive investigation of the influence of geometry-dependent factors on performance metrics of superconducting single-photon detectors. With fundamental knowledge, main investigations are focused to extend the spectral bandwidth and to enhance the detection efficiency, especially in infrared range. The developed technology of single-spiral detectors and unconventional electron-beam lithography allows to improve the performance of superconducting detectors.

Characterization of High Temperature Superconductor Cables for Magnet Toroidal Field Coils of the DEMO Fusion Power Plant
Characterization of High Temperature Superconductor Cables for Magnet Toroidal Field Coils of the DEMO Fusion Power Plant

Author: Bayer, Christoph M.

Publisher: KIT Scientific Publishing

Published: 2017-02-16

Total Pages: 222

ISBN-13: 373150605X

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Nuclear fusion is a key technology to satisfy the basic demand for electric energy sustainably. The official EUROfusion schedule foresees a first industrial DEMOnstration Fusion Power Plant for 2050. In this work several high temperature superconductor sub-size cables are investigated for their applicability in large scale DEMO toroidal field coils. Main focus lies on the electromechanical stability under the influence of high Lorentz forces at peak magnetic fields of up to 12 T.

Development of an Air Coil Superconducting Fault Current Limiter
Development of an Air Coil Superconducting Fault Current Limiter

Author: Naeckel, Oliver

Publisher: KIT Scientific Publishing

Published: 2016-11-14

Total Pages: 220

ISBN-13: 3731505266

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Electrical power grids are the lifeline of technical infrastructure and fundamental for industry and modern lives. Fault Currents can disrupt the continuous supply of electrical energy, cause instable grid conditions and damage electrical equipment. The Air Coil Superconducting Fault Current Limiter (AC-SFCL) is a measure to effectively limit fault currents. The concept is investigated and proven experimentally by designing, building and successfully testing a 60 kV, 400 V, z = 6% demonstrator.

Fluorescent thermal imaging method for investigating transient effects in high-temperature superconductor tapes and coils
Fluorescent thermal imaging method for investigating transient effects in high-temperature superconductor tapes and coils

Author: Gyuráki, Roland

Publisher: KIT Scientific Publishing

Published: 2022-02-24

Total Pages: 194

ISBN-13: 3731510642

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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.