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 12 of 12 for “"beam characterization"”.
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Electron beam characterization of carbon nanostructures
… These simulation results are applied to the characterization of nanocrystalline carbon cores found in a subset of graphitic presolar stardust. Electron diffraction data from these cores indicates they are comprised primarily of unlayered graphene sheets. Comparison to simulations indicates …
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Beam characterization at the neutron radiography reactor
The quality of a neutron imaging beam directly impacts the quality of radiographic images produced using that beam. Fully characterizing a neutron beam, including determination of the beam's effective length-to-diameter ratio, neutron flux profile, energy spectrum, image quality, and beam …
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Non-perturbative electron beam characterization with a microwiggler
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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High-dimensional, multiplexed, single-shot ptychography for spatiotemporal ultrafast pulse-beam characterization
… reference-free, full-field spatiotemporal characterization of ultrafast pulse-beams. This thesis also details two precursor techniques: spatiospectral characterization with scanning multiplexed broadband ptychography, and single-pulse, reference-free, full-field spatiospectral …
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Beam characterization for accelerator-based boron neutron capture therapy using the ⁹Be(d,n) nuclear reaction
… gold foils. Data have been taken with deuteron beams of 1.3 MeV to 1.8 MeV. As deuteron energy was increased, the tumor dose rate correspondingly improved due to the neutron yield increase. However, the data suggest that the advantage depth decreased, and the ratio of the fast neutron dose rate …
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Long-Distance Flux Mapping Using Low-Cost Collimated Pyranometers
… designs emerge to reduce costs. Conventional beam characterization systems that use photographs of the reflected beam on a tower-mounted target are typically not large enough to capture the beam at large distances, and the magnitude of the irradiance for long-distance heliostats is quite low …
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Simulation of optical impacts of gravity-induced deformations of concentrating solar collectors
… of collectors. Together the deformations and beam characterization lead to a useful, cost-effective process to analyze solar collectors. The results of the study show that the simulations presented can accurately match experimental data. The final process allows for design changes to be …
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Design and Analysis of the Onsala 4mm Receiver and other Antenna Configurations for Millimetre Wave Astronomy
… new science at that longer wavelength. Gaussian beam mode analysis was used to produce the fundamental optical design. This is computationally efficient, and provides all critical beam characterization through the optical train within the paraxial limit. The design was analysed more accurately …
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Insights into the radiation Chemistry of FLASH Radiation Therapy
… radiolytic species production and physical beam parameters relevant to FLASH-RT, alongside dosimetry tools for reliable UHDR beam characterization.</p> <p><strong>Methods:</strong> A beam collector (BC) Faraday cup detector was characterized on a FLASH Mobetron and benchmarked against a …
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Dosimetric characterization of a miniature x-ray source for biophysics studies
… and characterise these low energy X-Ray beams with the aim of investigating the relative biological effectiveness of low energy electrons. The scope of this study is to design and characterize low energy X-Ray beams, suitable for biophysical experiments using Gafchromic’s XR-QA2 …
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Characterization and application of simultaneously spatio-temporally focused ultrafast laser pulses
… not yet wide spread. I present here an in-situ characterization technique for both spatial and temporal diagnosis of SSTF pulses. By performing a knife-edge scan and collecting the light in a spectrometer, the relative spectral position as well as beam size can be deduced. Temporal …
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Novel smart modules for imaging, communications, and displays
… The proposed modules include imagers for laser characterization and general purpose imaging which smartly adapt to changes in irradiance, optical wireless communication systems which can adapt to the number of users and to changes in link length, and a smart laser projection display that smartly …