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Showing 1 to 20 of 22 for “"Fast Ion"”.
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Crystallographic origins of fast-ion conduction in pyrochlore
We have examined the crystallographic origins of fast-ion conduction in oxides with the pyrochlore structure-type, ideally A2B2O7, a superstructure of (A,B)20 3.5 defect fluorite-like array. These materials have technological promise for use in electrochemical devices such as oxygen sensors and …
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Investigation of the non-Arrhenius behavior of fast ion conducting glasses
<p>Traditional glassy ion conductors exhibit Arrhenius temperature dependence of the d.c. conductivity. Recently, Kinc and Martin1 reported the discovery of a Fast Ion Conducting (FIC) glass with ionic conductivities as high as 10-2 (O-cm)-1. Surprisingly, while this is a very high conductivity for …
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Orbital effects on pitch angle diffusion of injected fast-ion beams in tokamaks
The effects of ion orbits on pitch angle scattering of fast ion beam injection are investigated here for the magnetic equilibrium of the ITER tokamak. Two methods are used to calculate distributions in the presence of orbits, one applying boundary conditions a posteriori and one a priori. In both …
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Fast ion tails during radio frequency heating on the Alcator C-Mod tokamak
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Experimental measurements and numerical modeling of fast-ion distributions in the Alcator C-Mod Tokamak
… measurements and modeling of minority heated fast-ion distributions in the Ion Cyclotron Range of Frequencies (ICRF) on the Alcator C-Mod tokamak. Analysis of fast-ions >100Te is important for both ITER and a future fusion reactor as both will have a significant population of 3.5 MeV alpha …
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A study of prompt fast ion losses from neutral beam injection in the DIII-D tokamak
… the prompt losses of injected neutral beam born fast ions was conducted on the DIII-D tokamak at General Atomics using scintillator based fast ion loss detectors (FILD) and a reverse orbit calculation code. Prompt losses, also called first orbit losses, result from injected neutrals that are …
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Exploring kinetics and thermodynamics in fast-ion conductors and hydrogen-storage materials using ab-initio molecular dynamics
… ab-initio molecular dynamics simulations. The time-averaged and instantaneous silver substructure in the fast-ion conductor AgI is analyzed, resulting in a set of ordering rules that govern the distribution of the mobile silvers in the first coordination shell surrounding an iodine. …
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Fast-ion spectrometry of ICF implosions and laser-foil experiments at the omega and MTW laser facilities
Fast ions generated from laser-plasma interactions (LPI) have been used to study inertial confinement fusion (ICF) implosions and laser-foil interactions. LPI, which vary in nature depending on the wavelength and intensity of the driver, generate hot electrons with temperatures ranging from tens to …
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Synthesis, cation distribution, and disorder of fast-ion conducting pyrochlore oxides : a combined neutron and X-ray Rietveld analysis
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Design, construction, and characterization of an ultra-sensitive, high-precision fast ion-beam spectrometer for the study of molecular ions
This dissertation details the design, construction and characterization of a sensitive, fast ion beam spectrometer to record the absorption spectra of molecular ions. It is the first work to use the noise immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) technique in …
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Fast ion conduction in solid electrolyte materials: An investigation of the relationship between lattice dynamics, geometric frustration induced disorder, and ionic conductivity
The student, William Gustafson, accepted the attached license on 2020-07-21 at 14:32.
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Measurement and interpretation of stable and unstable Alfvén eigenmodes in the presence of fast ions in Alcator C-Mod
… resonant eigenmodes in the presence of energetic ions is studied in Alcator C-Mod. Global Alfven eigenmodes (GAEs) can exist at frequencies between the continua of adjacent poloidal mode numbers to avoid strong continuum damping. Toroidicity-induced Alfven eigenmodes (TAEs) exist in gaps in the …
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Atoms, ions and molecules in intense ultrafast laser fields
… dynamics of atoms and hydrogen molecules in ultrafast intense laser pulses are studied experimentally using time of flight mass spectroscopy and fast ion beam techniques. The content of the study can be split naturally into two parts; the first dealing with the interaction of noble gas atoms and …
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Instabilities and transport in magnetized plasmas
… on transport. First we consider the collisional (fluid) magnetized magnetorotational instability (MRI) in the presence of the Braginskii viscosity. We conduct a global linear analysis of the instability in a galactic rotation profile for three magnetic field configurations: purely …
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High temperature alkali corrosion kinetics of low expansion ceramics
The gaseous alkali corrosion kinetics of silicon carbide, silicon nitride, alumina, mullite, cordierite, transformation toughened zirconia, and aluminum titanate were systematically investigated from 950°C to 1100°C in dry air containing 1.0 +/- 0.1 vol% alkali. The linear reaction rates observed …
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Mass-spectroscopy and modeling of capacitive coupled hydrogen plasmas
This work presents the characterization of a radio-frequency, capacitively coupled, symmetric, hydrogen plasma. Both steady-state operation and the time-prole of the afterglow when RF power is terminated are investigated. Fluxes of the hydrogen ions, H+ , H+2, H+3, at the grounded electrode are …
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Probing the electrochemical dynamics of soluble redox active polymers
… the synergism between the chemical and dimensional properties of redox nanomaterials for addressing the manifold performance demands faced by energy storage technologies. Our groups are interested in the development and implementation of a new strategy for non-aqueous flow batteries (NRFBs) …
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Novel phase and phase transition behavior of a superionic conductor observed on the nanoscale
This dissertation documents the work performed in the pursuit of a PhD degree in the research group of Prof. Prashant K. Jain at the University of Illinois at Urbana-Champaign. I employed in-situ transmission electron microscopy (TEM) for understanding the ionic structure, vacancy ordering, phase …
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Block Copolymer-derived Porous Polyimides and Carbon for High-Performance Energy Storage
… microstructures defined by the microphase separation of constituent blocks, enabling various applications in energy storage. Dictated by the molecular weights and volume fractions of constituent blocks, the microphase separation forms nanoscale microstructures of 1-100 nm. Selective removal of a …
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MHD stability of magnetically confined plasmas in presence of superthermal particles
L'abstract è presente nell'allegato / the abstract is in the attachment
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