Browsing UT Electronic Theses and Dissertations by Department "Physics"
Now showing items 120 of 536

The (112) surface of groupIV semiconductors and properties of PtSi : a first principle study
(200708)First principle calculations on the (112) surface of the groupIV elements diamond, silicon, germanium and αtin were carried out within the framework of Density Functional Theory (DFT). We report chemical trends in surface ... 
2D magnetic equilibrium and transport modeling of the Xdivertor and super Xdivertor for scrapeoff layer heat flux mitigation in tokamaks
(201408)Intense heat fluxes from the divertor incident on material surfaces represent a “bottleneck” problem for the next generation of tokamaks. Advanced divertors, such as the XDivertor (XD) and Super XDivertor (SXD), offer a ... 
A "heat pipe"style recirculating lithium oven for entrainment into supersonic helium beams
(20171207)This thesis presents the work on a new oven design optimized for the entrainment of lithium into a pulsed supersonic beam of helium. The proposed oven does not pollute the vacuum with lithium atoms that are not entrained, ... 
A comparative study of entrainment in supersonic beams
(201608)In the field of atomic physics, there is a growing demand for large numbers of dense, trapped atoms. The traditional method of generating trapped atoms is through laser cooling, however the field has reached saturation in ... 
Accelerator systems and instrumentation for the NuMI neutrino beam
(2005)The Neutrinos at the Main Injector (NuMI) neutrino beam facility began operating at the Fermi National Accelerator Laboratory in 2005. NuMI produces an intense, muonneutrino beam to a number of experiments. Foremost of ... 
Adiabatic dynamics of lowlying collective modes in the BECBCS crossover
(201108)As the hydrodynamic theory breaks down with the local density ap proximation in the fermionic superﬂuid with spinpolarization, we develop a general formalism of the adiabatic dynamics for the lowlying collective ... 
AFMbased measurement of the mechanical properties of thin polymer films and determination of the optical path length of nearly indexmatched cavities
(200805)Two technologies, immersion and imprint lithography, represent important stepping stones for the development of the next generation of lithography tools. However, although the two approaches offer important advantages, ... 
AFMbased microrheology of biological cells : correlation of local viscoelasticity and motility
(200308)Local viscoelasticity of a cell is important in understanding the extension of the lamellipodium, which contributes to the cell’s motility. It has been a challenge to accurately measure viscoelastic properties of a thin ... 
Alfvén modes and waveparticle interaction in a tokamak
(20170928)This work is motivated by the nonlinear waveparticle interaction problems. To build a selfconsistent theory, we consider eigenmodes of the bulk plasma as well as the dynamics of the energetic particles. The modes of our ... 
Alignment effects of hydrogen reflection by Si(100)
(201508)Previous scattering experiments have shown a dependence of reflectivity on the alignment of the angular momentum vector of molecular hydrogen incident on a surface of Pd(111), Isakson 2001. In these past experiments ... 
Alkali impurities on quantum thin films : adsorption, electron scattering, and impurityinduced nanostructure formation in the quantum regime
(200812)For thin epitaxial metal films, when the thickness is on the order of the Fermi wavelength, [lambda subscript F], quantum confinement can dramatically alter the physical properties of the film. These socalled Quantum Size ... 
An exploration on electron bunching of ionization induced selfinjection in laser wakefield accelerators
(201605)Plasmabased wakefield accelerator is attractive for generating quasimonoenergetic electron beams using the bubble regime. The bubble is formed by an intense driver, which propagates through the plasma and expels all ... 
Analysis of atomic and molecular negative ions in a constant electric field using a resolvent method
(200812)We use a resolvent method to study atomic and molecular negative ions in a constant electric field potential which is linear. When a linear potential is applied, it makes the shape of the original potential of the system ... 
Analysis of crystalline ammonium hexafluorophosphate using nuclear magnetic resonance force microscopy (NMRFM) and design and construction of a dynamical roomtemperature NMRFM microscope
(201108)In this dissertation I explain the theoretical and experimental details of nuclear magnetic resonance force microscopy (NMRFM). I report the data that I have collected on ammonium hexafluorophosphate at room temperature ... 
Analysis of multifrequency interferometry in a cylindrical plasma
(200608)This work was motivated by questions raised from multifrequency microwave interferometer measurements taken in a cylindrical plasma on the Variable Specific Impulse Magnetoplasma Rocket (VASIMR) project. Standard data ... 
Application of a one dimensional nonlinear model to flow in hydrofractured shale gas wells using scaling solutions
(201505)Estimations of shale gas reserves rely heavily on decline analysis of existing wells. In this work, I describe a new method of production analysis for shale gas reservoirs using a minimal model. This method relies on ... 
The application of visualization methods to educational data sets with inspiration from statistical and fluid mechanics
(201405)This dissertation focuses on the development of visualization methods that enable us to examine longitudinal data in a unique way. We take inspiration from statistical and fluid mechanics to represent our data as a "flow" ... 
Applications of Hamiltonian theory to plasma models
(201605)Three applications of Hamiltonian Methods in Plasma Physics are presented. The first application is the development of a new, fivefield, Hamiltonian gyrofluid model. It is comprised by evolution equations for the ion ... 
Applications of noise theory to plasma fluctuations
(2007)Fluctuation phenomena are important to many physical systems, such as the fusion plasma. Noise theory is used to study the time and space correlations of stationary Markovian fluctuations that are statistically homogeneous ... 
Aspects of antiferromagnetic spintronics
(201408)Spintronics is the study of mutual dependence of magnetization and electron transport, which forms a complementary picture in ferromagnetic (FM) materials. Recently, spintronics based on antiferromagnetic (AF) materials ...