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Title: Bremsstrahlung diagnostics for the study of x-ray emission from laser produced plasmas
Author: McKeever, Killian J. A.
ISNI:       0000 0004 5915 758X
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2015
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The work described in this thesis covers the design and implementation of diagnostics for measuring the bremsstrahlung emission from laser produced plasmas with the aim of determining their hot electron temperatures and observing the effects of laser interactions. Four main experiments are reported which cover the development of the bremsstrahlung diagnostics and their use in measuring and analyzing experimental data. This thesis is split into 5 chapters and an appendix. Chapter 1 gives background information on laser plasma interaction and absorption processes, the process of hot electron production and refluxing, the process of bremsstrahlung and hot electron temperature measurement and the scaling laws applying to these measurements. Chapter 2 describes the initial experiments on which the hot electron diagnostics were first developed and their application to the study of K-shell emission from laser irradiated titanium foils and subsequently in a study of bremsstrahlung emission from targets of differing atomic number and structure. Chapter 3 describes a further experiment to measure the Ka emission from laser irradiated titanium foils in which the differential lead diagnostic was used along with a newly developed Ross pair temperature diagnostic. These diagnostics were used in combination to view the front and rear surfaces of the target foil and their results are compared and analyzed in the experimental results. Chapter 4 describes an experiment to measure the angular bremsstrahlung emission for a series of laser irradiated targets using a number of differential lead diagnostic detectors surrounding the target foil. Chapter 5 gives a summary of the main results and conclusions and suggests future work to further improve the diagnostics. The appendices cover the design process of each of the diagnostics used in the main experiments, the background theory behind the operation of these diagnostics and the analysis methods and codes written to process experimental data
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available