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 14 of 14 for “"Microwave generation"”.
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High Power Microwave Generation for Advanced Particle Acceleration
… demonstration of advanced high power microwave sources for application to high gradient particle accelerators. The major effort was directed at the design and successful test of a metamaterial-based power extractor at the Argonne Wakefield Accelerator (AWA). We obtained up to 565 MW, …
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Metamaterial structures for Wakefield acceleration and high power microwave generation
… wakefield acceleration and high power microwave generation. Under the topic of wakefield acceleration, on the theoretical side, several metamaterial structures have been designed and simulated. The novel phenomenon of reversed Cherenkov radiation has been found to enhance the beam-wave …
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High power microwave generation using an active metamaterial powered by an electron beam
… and experimental demonstration of coherent microwave generation at 2.4 GHz in a metamaterial loaded waveguide using a 490 keV, 84 A, one microsecond pulse length electron beam that produced more than 5 MW of microwave power. Three different metamaterial structure designs named MTM1, MTM2, …
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The Generation and Detection of Squeezed Microwave Photons Realized using Traveling-Wave Parametric Amplifiers
… in quantum-limited amplification and squeezed microwave generation. In this thesis, we develop a dual-pump, broadband Josephson traveling-wave parametric amplifier (JTWPA) to demonstrate non-degenerate four-wave mixing using a dual-dispersion-engineered JTWPA and investigate its squeezing …
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Performance analysis of high power photoconductive switch at elevated temperature
… semiconductor switch, used in high power microwave generation. Specifically, effects of heating on the contacts and the bulk were studied. The changes in the I-V characteristics before and after heating the switches were analyzed. For heating effects, a power density input had been taken …
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Development of Dielectric Spectroscopic Resonant Sensors for Biomedical and Industrial Applications
… that utilising alternating electric fields at microwave frequencies. Characterisation and identification of biological samples is currently an expensive and time consuming procedure due to the extreme variation of seemingly similar biological systems. The work describes the development of …
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New techniques for multiple wavelength fiber laser generation based on edfa and tdfa
… fiber laser (MWFL) can be a potential source for microwave generation as the conventional microwave generator have several issues in generating high frequency. In order to be such source, the MWFL must have the following criterion; a great number of comb lines, a compact design, adjustable and …
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Microwave emission in a plasma filled nonuniform backward wave oscillator
High power microwave radiation is used in science, industry, and by the military for a variety of purposes including the acceleration of particles in high energy physics, heating of plasma particles, radiation treatment of surfaces in manufacturing, and for electronic warfare in the military. Among …
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Characterization of the Dynamics of Optically-Injected Nanostructure Lasers
… conversion, chaotic-communication, and photonic microwave generation. In this dissertation, the optical-injection of quantum-dash and quantum-dot Fabry-Perot semiconductor lasers is investigated in the context of modeling the impact of their characteristically large nonlinear gain component. The …
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Mode-locked laser diodes for the 750 – 770 nm spectral region
… are excellent candidates for ultrashort pulse generation due to their advantages in compactness, weight, energy efficiency and cost. In this dissertation, we present the first demonstration of semiconductor mode-locked laser diodes in two wavebands – 750 nm and 760 nm. Both chips were based on …
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Deposition of yttria-stabilized zirconia thermal barrier coatings by laser-assisted plasma coating at atmospheric pressure
… thesis details the design and construction of a microwave generation system, and a coaxial cylindrical plasma torch, where an atmospheric-pressure plasma (APP) can be generated using 2.45 GHz. The discharge characteristics of the atmospheric plasma, such as electron temperature Te, electron …
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Manufacturing strategy for high current cold field emission cathodes: Floating catalyst chemical vapour deposition grown carbon nanotube fibres and films enhanced by laser patterning and laser purification process
… mA) field emission (FE) devices for military (microwave generation) and civilian (particle accelerator electron beam) applications using carbon nanotubes (CNT) as base material. With a particular focus on the relationship of the laser time pulse duration used for cutting CNTs and how this …
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Sub-femtosecond optical timing distribution for next-generation light sources
… realizing a new regime of light control in next-generation X-ray free-electron lasers. These facilities aim to generate sub-femtosecond (fs) X-ray pulses with unprecedented brightness to realize the long-standing scientific dream to capture chemical and physical reactions with atomic-level …
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A Compact RF/Photonic Antenna using a Quantum Dot Mode Locked Laser as a Source
… A two-section QDMLL is used to produce pulsed microwaves signals to feed the radiating antenna. To realize the microwave signal radiation generated by the QDMLL, several possible MLL-integrated-antennas are proposed. The prototype integrated antenna is fully described, including the design, …