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Showing 1 to 20 of 23 for “"Photocathode"”.
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Experimental study of a 17 GHz high gradient photocathode injector
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Theoretical and experimental studies of a 17 GHz photocathode RF gun
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Low emittance electron beam production and characterization with a 17 GHz photocathode RF gun
… high brightness electron beams using a 17 GHz photocathode RF gun. A beam brightness of up to 8x 1013 A/([pi]m rad)2 was measured for a 1 MeV, 1 ps, 50 pC electron bunch. Such high brightness beams are critically important as injectors for linear accelerators and free electron lasers. The …
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Development of a 300 KV DC High Voltage Photogun and Beam Based Studies of Alkali Antimonide Photocathodes
… at - 300 kV bias voltage using alkali-antimonide photocathodes. This photogun will provide a magnetized electron beam for the future Jefferson Lab Electron-Ion Collider (JLEIC) cooler. This research describes key electrostatic design features of the photogun and evaluates the performance of the …
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Molecular Hybrid Photocathodes Based on Silicon for Solar Fuel Synthesis
… crisis. In this context, the development of photocathodes for the use in photoelectrochemical cells is an attractive approach for the storage of solar energy in the form of a chemical energy carrier (e.g. H$_{2}$ and CO$_{2}$-reduction products from H$_{2}$O and CO$_{2}$). However, molecular …
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Design and applications of cold-cathode X-ray imaging systems
… of cold-cathode x-ray sources: an ultraviolet photocathode-based source, and a silicon field emission chip; (2) novel methods for planar x-ray image acquisition, including a demonstration of dynamic x-ray elastography using a pulsed photocathode x-ray source; and (3) applications of modern …
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Solar Driven Hydrogen Generation with Dye-Sensitised CuCrO2 Photocathodes
… for H2 generation from water. Fuel-forming photocathodes are currently limited by the small range of wide-bandgap p-type semiconductors available. The majority of previous reports have employed NiO, which displays low performance with immobilised dyes and catalysts, requiring exploration of …
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A high average-current electron source for the Jefferson Laboratory free electron laser
… of electron bunches being launched from a photocathode, measurements were performed on a similar injector to evaluate the thermal energy and response time of the cathode. These values are a function of the laser wavelength used with the photocathode and so were repeated over a range of …
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Using Fundamental Properties of Light to Investigate Photonic Effects in Condensed Matter and Biological Tissues
… OAM) with a p-type bulk GaAs sample and a GaAs photocathode with a layer of cesium (Cs) (Cs-GaAs). The transfer of SAM and OAM light to polarized electrons were evaluated using a Cs-GaAs photocathode optical device. This study merges two important fields: condensed matter and complex light. The …
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Semi-biological domino catalysis using acetate- and propionate-producing microbes
… was coupled to acetogenesis by using a photocathode to generate H2 via the H2 evolution reaction (HER), which was then consumed by acetogenic bacteria Clostridium ljungdahlii (C. ljungdahlii) for acetate production. The photocathode consisted of an organic photovoltaic (OPV) device, …
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Photodetection in Silicon Pyramidal Microdischarges
… mechanism. The silicon electrode acts as a photocathode and converts incoming photons into electrons, which then undergo a multiplication in the plasma. The electron multiplication, measured during experiments, is greater than 3.
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Photoelectrochemical and Chemoenzymatic Reforming for Sustainable Fuel Production
… The PEC systems consist of a perovskite|Pt photocathode for clean H₂ production and a Cu-Pd alloy anode for reforming diverse waste streams, including pre-treated cellulosic biomass, polyethylene terephthalate (PET) plastics, and industrial by-product glycerol into industrially-relevant, …
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Timing Diagnostics and Coherent Harmonics from a test-FEL
… gun with a barium oxide cathode was adapted for photocathode operation, and the performance of the gun was tested. Measurements showed the production of 200 pC of electrons with a normalized emittance of 5.5 mmmrad and a quantum efficiency of 1.1 10-4. To ensure the electron bunch overlap with …
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Development of a motion-free tomographic imaging system
… amplifier. When illuminated by a UV LED, this photocathode emits a beam of electrons, with a maximum beam current of up to 500 uA per amplifier. The produced electrons are then accelerated through a high voltage to a tungsten target. These sources are individually addressable and can be pulsed …
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ZnSe Quantum Dots as a platform for solar fuels synthesis
… semiconductor CuCrO2, forming a QD-sensitised photocathode. The CuCrO2-ZnSe photocathode exhibited photocurrents of up to 15 µA cm-2 and was active in controlled potential photoelectrolysis for the reduction of aqueous protons to evolve H2 (38 nmol H2 after 4 h irradiation). Overall, this work …
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Development and investigation of integrated solar systems for hydrogen and methanol production
… water splitting on the custom built photocathode of the reactor. Case studies are presented for system integration with methanol synthesis from solar energy and anthropogenic carbon capture for environmentally benign fuel production.
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Semi-Artificial Photoelectrochemistry through Perovskite Integration and Elucidation of the Local Environment
… halide perovskite to produce a highly active photocathode. The recombinant DvH [NiFeSe]r hydrogenase was selected due to its relative ease of purification, high activity, relative O₂ tolerance, resistance to H₂, and intrinsic bias for proton reduction. The biocatalyst was immobilised on a …
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Solar-driven catalytic processes for sustainable fuels and chemicals production
… layer on commercial PV products. The designed photocathode shows the best reported photoelectrochemical (PEC) nitrate-to-NH3 performance. Also, we demonstrate a large-scale stand-alone PEC device that can simultaneously attain unbiased ammonia production and biomass oxidation. Its scalability …
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Next generation optoelectronic devices for energy applications utilising metal oxides, bismuth oxyhalides and lead halide perovskites
… developed to improve the stability of BiOI as a photocathode to produce hydrogen by water splitting. The third project examines the fundamental limitations of BiOI and how they could be overcome. By developing the growth of BiOI single crystals through chemical vapour transport, a series of …
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Investigation of novel ammonia production options using photoelectrochemical hydrogen
… semiconductor (copper oxide) on the photocathode. The characterization of the reactor under solar simulator light, ambient irradiance and concentrated light is accomplished. Furthermore, an electrochemical ammonia synthesis reactor is built using molten salt electrolyte, nickel …
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