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 18 of 18 for “"ion beam analysis"”.
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The application of Bayesian statistics and maximum entropy to Ion beam analysis techniques
The elimination of some blurring property, such as the detector response function, from spectra has received a considerable amount of attention. The problem is usually complicated by the presence of noise in the data, and in general, there exists an infinite set of possible solutions which are …
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Development of accelerator based spatially resolved ion beam analysis techniques for the study of plasma materials interactions in magnetic fusion devices
Plasma-material interactions (PMI) in magnetic fusion devices pose significant scientific and engineering challenges for the development of steady-state fusion power reactors. Understanding PMI is crucial for the develpment of magnetic fusion devices because fusion plasmas can significantly modify …
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Development and testing of an in situ method of ion beam analysis for measuring high-Z erosion inside a tokamak using an AIMS diagnostic
… a deeper understanding of the dynamics of erosion, redeposition, and fuel retention in these surfaces will require in situ measurements. A first-of-a-kind technique, Accelerator-Based In-Situ Materials Surveillance (AIMS), was developed for this purpose and first demonstrated on Alcator C-Mod …
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An assessment of the use of nuclear microprobe techniques in pollution studies : quantification of elemental concentrations in fish scales
This thesis deals with the applicability of Ion Beam Analysis (IBA) techniques for ascertaining the extent of water pollution by analyzing scales of fish that live in polluted waters. As a fish grows, ions from its immediate environment are incorporated into the matrix of the fish scale and so …
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Development and simulation of a cylindrical cusped-field thruster and a diagnostics tool for plasma-materials interactions
… Institute of Technology Space Propulsion Laboratory, this thruster uses cusped magnetic fields aligned in alternating polarity in order to confine electrons, thus slowing their flow to the anode and readily ionizing neutral gas, which is then electrostatically accelerated by the anode. …
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Multi-scale investigations of the Resistance to helium embrittlement with Direct Energy Deposited Inconel 718
To address the high levels of helium production in advanced fission and fusion reactors, in an economical manner, Direct Energy Deposition (DED) was utilized with the existing alloy, Inconel 718. Based on previous works with DED and laser welding, it was hypothesized that nano-sized pores could be …
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External proton beam analysis of plasma facing materials for magnetic confinement fusion applications
… for this thesis and for surface science applications at the Cambridge laboratory for accelerator study of surfaces (CLASS). At CLASS, an external proton beam set-up was designed and constructed to perform in-air ion beam analysis on plasma facing divertor tiles from the Alcator C-Mod tokamak. A …
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Gamma ray production cross sections of proton bombardment of fluorine for light element analysis and depth profiling
Due to the interdependence of fusion reactor performance and the surface conditions of the plasma facing components (PFC), diagnostic techniques that monitor the conditions of PFCs are useful. One ion beam analysis (IBA) diagnostic technique utilizes particle induced gamma emission (PIGE) analysis …
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An Investigation of Target Poisoning during Reactive Magnetron Sputtering
… of the present work is a broad investigation of the so called "target poisoning" during magnetron deposition of TiN in an Ar/N2 atmosphere. Investigations include realtime in-situ ion beam analysis of nitrogen incorporation at the Ti sputter target during the deposition process …
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The Stopping of Energetic Si, P and S Ions in Ni, Cu, Ge and GaAs Targets
… powers is essential for these for quantitative analysis and surface characterization of thin films using ion beam analysis (IBA). These values are also of interest in radiobiology and radiotherapy, and in ion- implantation technology where shrinking feature sizes puts high demands on the …
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Real-time RBS analysis of plasma erosion in DIONISOS
… facing the development of commercial nuclear fusion reactors lies at the plasma-material boundary. Plasma temperatures greater than 10 million degrees Celsius (10 keV) require clever magnetic field configurations to confine the plasma near the center of the toroid. However, the materials directly …
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Diluted Magnetic Semiconductor Cobalt and Europium Implanted ZnO Thin Film
… because of their potential for multifunctional spintronics devices. ZnO based semiconductors have been identified to be the promising room temperature ferromagnetic materials with a wide band-gap. However, the intrinsic room temperature ferromagnetic spintronics materials are still far to …
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Synthesis and Blend Behaviour of Multi-End Capped Polyethylene
… with specific surface properties for the production of modified materials. Recently, extremely efficient polymer surface modification has been achieved by incorporating dendritically end functionalised polymers into blends, which combine sufficient mobility, with optimal functionality, to cause …
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Hydrogen evolution and transport in semiconductors
… structures are used for the fabrication of integrated electronic circuits, photonic devices and structures, and micro-electro-mechanical systems. The most common fabrication method for SOI is a hydrogen-induced cleavage technique in which ion-implanted hydrogen is employed to initiate …
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Hydrogen evolution and transport in semiconductors
… structures are used for the fabrication of integrated electronic circuits, photonic devices and structures, and micro-electro-mechanical systems. The most common fabrication method for SOI is a hydrogen-induced cleavage technique in which ion-implanted hydrogen is employed to initiate …
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Analysis of damage mechanisms in boronized TZM tiles from Alcator C-Mod fusion reactor operations
… operated by the MIT Plasma Science and Fusion Center. Following the 2008 Alcator C-Mod campaign, the reactor was shut down and opened for maintenance and upgrades. During this time, it was discovered that the boronized TZM tiles, with boron films applied in situ, lining the inner surfaces …
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Darstellung eines Referenzmaterials für die ortsaufgelöste Wasserstoffanalytik in oberflächennahen Schichten mittels Kernreaktionsanalyse
… Unter diesen nimmt die auf einer Kernreaktion von Wasserstoff und Stickstoff basierende N-15-Methode einen herausragenden Platz ein. Sie liefert eine ortsaufgelöste Wasserstoffkonzentration bis in den ppm-Bereich in oberflächennahen Schichten (kleiner 2 µm). Gegenstand der Arbeit sind die …