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Showing 1 to 20 of 81 for “"ion energy"”.
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Ion Energy Characterization Study for Next Generation Semiconductor Lithography Based on Gas Discharge Produced Plasma Technology
Made available in DSpace on 2017-07-06T18:58:52Z (GMT). No. of bitstreams: 3 Spencer_Joshua_B_MS.pdf: 2808256 bytes, checksum: c5110b817658878526ca930884621d64 (MD5) Spencer_Joshua_B_MS_ABS.pdf: 10634 bytes, checksum: 5fa8d89970b067f7b96d32d335b75b68 (MD5) license.txt: 4813 bytes, checksum: …
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Construction of a gridded energy analyzer for measurements of ion energy distribution in the versatile toroidal facility
… Facility (VTF) at MIT's Plasma Science and Fusion Center provides a laboratory environment for studying ionospheric plasmas. Various plasma diagnostic devices have been created and used to study the VTF plasma since 1991. An accurate method for measuring VTF's ion characteristics has never been …
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Thermal Modeling of Lithium-Ion Energy Storage Systems for Hybrid Electric Vehicles Using Computational Fluid Dynamics with Conjugate Heat Transfer
… Electric Vehicle (HEV) relies largely on its Energy Storage System (ESS). High temperatures and thermal variations can significantly affect a battery's performance and lifecycle. An effective thermal management system is vital to the health and safe operation of the ESS's batteries. A well …
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Residual lattice defects in silicon(100) films doped with low-energy positive boron and positive arsenic ions during growth by molecular-beam epitaxy: Variation with ion energy and growth temperature
… 1000 eV $\sp{11}$B$\sp+$ and $\sp{75}$As$\sp+$ ions during growth by molecular-beam epitaxy (MBE) at temperatures of 800, 650, and 500 $\sp\circ$C. Photoluminescence (PL) and deep level transient spectroscopy (DLTS) were used to assess optical and electronic film quality by identifying and …
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Radiation damage in nickel(3) aluminum
… both fundamental and practical aspects of radiation damage. The first is a Transmission Electron Microscopy investigation of cascade damage under heavy ion irradiation; the second is a radiation induced segregation study. For the first topic, the cascade generated damage structure (namely, …
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Enhancing retarding potential analyzer energy measurements with micro-aligned electrodes
Plasmas are ionized gases, and constitute a large fraction of the known universe. For example, solar wind is a plasma that emanates from the sun reaching the Earth's magnetosphere. At times these ionized species cause beautiful auroral displays over the planet's magnetic poles. Moreover, when a …
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Theoretical and experimental studies related to the compositional and microstructural evolution of alumina thin films
In this thesis, the correlation between plasma chemistry / ion energy and thin film composition / microstructure for cathodic arc deposited alumina thin films is investigated. To contribute towards understanding this correlation, both theoretical and experimental investigations have been performed. …
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Turbulence and transport measurements in Alcator C-Mod and comparisons with Gyrokinetic simulations
… in tokamak plasmas is the primary means by which energy is transported from the core of the plasma to the edge, where it is lost, and is therefore the main limitation of tokamak plasma performance. Dilution of the main-ion species was found to have a stabilizing effect on ion gyroradius scale …
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Carbon thin films with enhanced properties from cathodic arc plasmas.
… amorphous carbon ( ta-C) films as a function of the ion energy, deposition temperature and the deposition rate. A model based on the intrinsic thermal effects of the deposition process is developed to explain the discrepancy of the sp3 fraction versus the ion energy in the literature. The …
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Effects of High-Power Impulse Magnetron Sputtering on the Early Growth of Noble Metals on Weakly-Interacting Surfaces
… sputtering (DCMS), HiPIMS provides a higher ionized flux fraction and increased ion energy, offering additional control over film-growth dynamics. The early stages are particularly important because the morphology formed within the first few nanometers determines interface properties, film …
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A precise determiniation of the fine structure constants for Cr(3⁺) in ruby.
… used in solid state physics research and applications. The experimental work described in this thesis is concerned with the precise determination of three important paramagnetic resonance parameters of the ruby crystal at room temperature. These are the two spectroscopic splitting factors ( g װ . …
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Low energy ion beam modification of the titanium silicide (100) reaction
This research investigated the effects of the ion beam assisted deposition process on the interdiffusion and reaction of Ti thin films deposited on Si (100). The analytical techniques employed for the characterization of these thin films included transmission electron microscopy, scanning electron …
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Characterization of the dynamic formation of nano-tendril surface morphology on tungsten while exposed to helium plasma
… on the nanometer scale when subjected to low energy helium ion bombardment. This is due in part to the ion bombardment causing tungsten atoms to move on the surface, but also because of helium implantation and bubble development in the near surface at a depth < 30 nm. At high enough surface …
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Experimental and Modeling Studies of Low-Energy Ion Sputtering for Ion Thrusters
This thesis investigates low-energy xenon-molybdenum (Xe+-Mo) sputtering yields for ion energies of 100 eV and less. Sputtering yield data at these energies are important for ion thruster design and lifetime prediction. The basic principles of sputtering phenomena are discussed. An overview of …
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Nanostructural, Surface Morphological Evolution, and Physical Properties of Sodium Chloride-Structure Titanium Nitride and Titanium Cerium Nitride Layers as a Function of Composition
I use a combination of alloying and low-energy ion irradiation during film growth to controllably manipulate the nanostructure of TiN-based layers. Ti0.8Ce0.2N films are grown on oxidized Si(001) at 350°C using UHV reactive magnetron sputter deposition in pure N2. The N+2 to metal ratio …
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Studies of charge transfer in the N+L₂P-N₂P system
Total charge-transfer cross sections have been obtained in the N₂⁺ - N₂ system with relative ion energies at seven different values between 9 and 441 eV. Data is obtained to examine the curvature and structural relation between total cross section versus ion energy. The effect of ion beam …
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Study of resonant charge transfer
… ol N₂ resonant charge transfer cross sections were performed. It was found that the energy of electrons used to produce the N₂⁺ ions is an important variable with respect to cross section. An examination of the experimental precision was performed and it was found that the precision of …
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Development of probes for assessment of ion heat transport and sheath heat flux in the boundary of the Alcator C-Mod Tokamak
Progress towards a viable fusion reactor will require comprehensive understanding of boundary plasma physics. Knowledge in this area has been growing, yet there are critical gaps. Measurements of the sheath heat flux transmission coefficient-a fundamental physical quantity whose theoretical value …
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Microthrusters based on the T5 and T6 hollow cathodes
… able to offer propellant savings over conventional alternatives and enable higher energy missions. Such a thruster would also be beneficial in the development of all-electric spacecraft whereby the normally separate reaction control system and primary electric propulsion system were able to …
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