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 35 for “"Beam profile"”.
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Quasiparticle beam profile measurements in superfluid helium 3 - B
… around 100 ➭K. In this thesis, the quasiparticle beam profile from a Black-Body radiator and a vibrating wire resonator is measured using a quasiparticle camera which consists of 25 tuning forks. The vibrating wire resonator is found to have a very thinly spread beam at velocities slightly higher …
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Beam profile characterization of light-emitting-diode curing units and its effect on polymerization of a resin-matrix composite
… the influence of the localized irradiance beam profiles from multiple light-emitting-diode (LED) light-curing units (LCUs) on the polymerization pattern within a resin-matrix composite (RMC). Irradiance beam profiles were generated from one quartz-tungsten-halogen and various single and …
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Multiple plane wave analysis of acousto-optic diffraction of Gaussian shaped light beams
… model is derived and used with a Gaussian light beam to observe the distortion in light beam profile within the sound field. Numerical results are presented for comparison to previous studies using thick holograms and two orders of light. The results from using two light orders are compared to …
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Preliminary investigation of a possible dose rate effect on survival of cells irradiated with low energy protons
… improvements were made, a means of measuring the beam profile was devised, the current measuring device and the dosimetry were improved and a possible dose rate effect on intracellular oxygen was investigated. After these improvements, the anomalous effect was much reduced, but not entirely …
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Topics on electron,neutrino and axion scattering
… side, development of a multi-purpose beam instrument based on synchrotron light to measure the electron beam polarization, beam profile and intensity at the future Electron Ion Collider is presented.
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A Control System for the E-Linac View Screen System
… and produce measurements of, the transverse profile of an accelerated electron beam. A control system is an essential component of the overall diagnostic device. The system requirements were compiled from those produced by the TRIUMF laboratory and from those based on the needs of the …
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Analysis of multifrequency interferometry in a cylindrical plasma
… project. Standard data analysis based on a thin beam model neglecting refraction yields inconsistent electron densities and density profiles for different frequencies. This work focuses on the development of a model for the wave propagation through cylindrical plasmas when the plasma radius is on …
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Preliminary investigation on optical cavity-based biosensor using double-sided tape.
… Cavity width adjustment was demonstrated through beam profile movement (maximum 1.44 mm), optical resonance, and by reducing the time required to achieve the optimal cavity width region (2.6-minute average). Overall, the simulations and data show this cavity structure with double-sided tape is …
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Upconverting nanoparticles: pushing theory and technology towards biomedical applications
… capabilities for characterising excitation beam profiles, scattering, and the emission spectrum of luminescent compounds in aqueous solutions. Accurate characterisation of the excitation beam profile is of particular importance due to its influence on the PD-dependent QY behaviour of UCNPs. …
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Additive Lithography Fabrication And Integration Of Micro Optics
… and are used to transform an input optical beam into a desired beam profile or to couple the input beam into waveguides, fibers, or other optical systems or devices. Macroscopic optical elements are easily fabricated using grinding and polishing techniques, but few methods exist for …
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Oblique reflections of internal gravity wave beams
… effects in reflections of internal gravity wave beams in a continuously stratified liquid which are incident upon a uniform slope at an oblique angle. Wave motion in a stratified fluid medium is unique in the sense that the anisotropy of stratification directs energy transport in a manner …
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Optical studies of super-collimation in photonic crystals
… in particular, the propagation of optical beams without spatial spreading. This effect, called super-collimation (also known as self-collimation), allows diffraction-free propagation of micron-sized beams over centimeter-scale distances. This linear effect is a natural result of the unique …
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Laser-trapped Atoms as a Precision Target for the Heavy-Ion Storage Ring TSR
… This method is of great interest for very dilute beams because reliable measurements down to very low ion currents in the order of 10 nA become possible. The resolution of this method is only limited by the size of the atom cloud (actual diameter: some 100 µm). Thus, the resolution is better than …
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An analytic model to predict detection threshold and performance data for misconvergence on a shadow-mask CRT
… phosphor-dot arrangement as well as the electron beam phase relationships. The model also includes a flexible beam profile which allows the user to specify the desired shape of the beam profile, that is, whether the profile is described with a Gaussian, leptokurtic, or platykurtic distribution. …
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High pulse repetition frequency XeCl laser and its applications
… of the effect of resonator configuration on the beam profile, have shown that the use of folded cavities will produce more uniform beam profiles.Experiments have been carried out, using this laser, to cut thin polyethylene teraphthalate (PET) film at rates up to 1.3m.s⁻¹. The 8x15mm output beam …
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The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques
… pixons, to various inverse problems in ion beam analysis; The results of this method of deconvoluting Rutherford Backscattering Spectrometry (RBS) and Proton Induced X-ray Emission (PIXE) spectra are compared to the results from other deconvolution techniques, namely Fourier Transforms, …
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Development and characterization of a diverging cusped field thruster and a lanthanum hexaboride hollow cathode
… while providing efficient acceleration of an ion beam, similar to traditional Hall type thrusters. The design, referred to as a Diverging Cusped Field (DCF) thruster, employs aspects of both existing cusped field thrusters and traditional Hall thrusters while including several unique design …
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Strain-controlled impurity-induced disordering for apertures in single-mode vertical-cavity surface-emitting lasers
… Owing to their small footprint, circular-beam profile, on-wafer probing capability, and high reliability, VCSELs have been widely deployed for data communication transmitters and position sensors. In the advent of emerging applications such as autonomous driving and 3-D facial recognition …
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