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Author: Bruce Kai Fong Young
Publisher:
ISBN:
Category : Laser plasmas
Languages : en
Pages : 724
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Book Description
Author: Bruce Kai Fong Young
Publisher:
ISBN:
Category : Laser plasmas
Languages : en
Pages : 724
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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The determination of level populations and detailed population mechanisms in dense plasmas has become an increasingly important problem in atomic physics. In this work, the density variation of line intensities and level populations in aluminum K-shell and molybdenum and silver L-shell emission spectra have been measured from high-powered, laser-produced plasmas. For each case, the density dependence of the observed line emission is due to the effect of high frequency electron-ion collisions on metastable levels. The density dependent line intensities vary greatly in laser-produced plasmas and can be used to extract detailed information concerning the population kinetics and level populations of the ions. The laser-plasmas had to be fully characterized in order to clearly compare the observed density dependence with atomic theory predictions. This has been achieved through the combined use of new diagnostic instruments and microdot targets which provided simultaneously space, time, and spectrally resolved data. The plasma temperatures were determined from the slope of the hydrogen-like recombination continuum. The time resolved electron density profiles were measured using multiple frame holographic interferometry. Thus, the density dependence of K-shell spectral lines could be clearly examined, independent of assumptions concerning the dynamics of the plasma. In aluminum, the electron density dependence of various helium-like line intensity ratios were measured. Standard collisional radiative equilibrium models fail to account for the observed density dependence measured for the ''He/sub .cap alpha.//IC'' ratio. Instead, a quasi-steady state atomic model based on a purely recombining plasma is shown to accurately predict the measured density dependence. This same recombining plasma calculation successfully models the density dependence of the high-n ''He/sub .gamma.//He/sub .beta./'' and ''He/sub delta//He/sub .beta./'' helium-like resonance line intensity ratios.
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Category :
Languages : en
Pages :
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We report experimental data from one of the first of this new generation of instruments designed specifically for laboratory x-ray laser diagnosis. Representative TGSS-EM data are presented from three different x-ray laser inversion schemes: collisional excitation of neon-like selenium (lambda approx. = 206, 209A); resonant photoexcitation of hydrogen-like fluorine (lambda = 81A); and recombination of hydrogen-like magnesium (lambda approx. = 130A). The data illustrate the measurement capabilities of the TGSS-EM and provide insight to the dynamics and emission characteristics of this new class of laser produced plasmas.
Author: Maricel Agop
Publisher: MDPI
ISBN: 3039364138
Category : Computers
Languages : en
Pages : 104
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The world of laser matter interaction has known great and rapid advancements in the last few years, with a considerable increase in the number of both experimental and theoretical studies. The classical paradigm used to describe the dynamics of laser produced plasmas has been challenged by new peculiar phenomena observed experimentally, like plasma particles’ oscillations, plume splitting and self-structuring behavior during the expansion of the ejected particles. The use of multiple complementary techniques has become a requirement nowadays, as different aspects can be showcased by specific experimental approaches. To balance these non-linear effects and still remain tributary to the classical theoretical, views on laser produced plasma dynamics novel theoretical models that cover the two sides of the ablation plasma (differentiability and non-differentiability) still need to be developed. Plasma is a strongly nonlinear dynamic system, with many degrees of freedom and other symmetries, favorable for the development of ordered structures, instabilities and transitions (from ordered to chaotic states). In such contexts, we showcased research based on global and local symmetries, complexity and invariance. This special number highlighted exciting new phenomena related to laser produced plasma dynamics with the implementation of theoretical models, towards understanding the complex reality of laser matter interaction.
Author: Stefan Andrei Irimiciuc
Publisher: World Scientific
ISBN: 9811270686
Category : Science
Languages : en
Pages : 233
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Fourteen years after the first proposal of a fractal theoretical model to understand the dynamics of laser produced plasma, a complete image of the model is projected on a wide range of empirical data related to laser produced plasmas.The book tackles the two sides of laser produced plasmas with experimental data on a wide range of materials, from metallic alloys to geological samples and the associated mathematical model is developed in the multifractal theory of motion. A new perspective is explored in analyzing and interpreting the data collected by electrical or optical methods, focusing especially on the charged particles dynamics and the nature of fractal fluctuations and their influence during measurements as well as to the scattering process and plasma splitting phenomena, all seen through the lens of multifractal physics.The book offers the best presentation of the multifractal theoretical model for the study of transient phenomena in laser produced plasmas, which focus leads to a balanced development of the model showcasing both the flexibility and the unique vision of a multifractal mathematical apparatus.
Author: Robin Stewart Marjoribanks
Publisher:
ISBN:
Category :
Languages : en
Pages : 400
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Author:
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ISBN:
Category :
Languages : en
Pages : 302
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Author: Ben Delaney
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Laser induced breakdown spectroscopy (LIBS) has emerged as a commonly used analytical technique for both qualitative elemental identification and quantitative concentration determination in various academic and industrial fields. The ultimate performance of LIBS is dependent on the signal to background ratio (SBR) of the spectra which are acquired from a sample and is quantified as the limit of detection (LOD) of the technique. A significant body of work has already been reported in the literature aimed at lowering of the LOD of LIBS. This work includes investigations into the effects of; laser fluence, wavelength and pulse length as well as space and time optimization, along with double pulse plasma formation and reheating arrangements. The aim of the work presented here is to generate and investigate the stagnation layer formed in vacuo, at the centre of an annular plasma, and to employ it in a LIBS experiment on trace Cu in Al. This is achieved by retrofitting a single optical element, namely an axicon, to the focusing lens normally used for point plasma formation. Spatially and temporally resolved imaging and spectroscopy are employed to track the formation and evolution of a stagnation layer at the centre of an annular plasma. Comparisons of these imaging and spectroscopy measurements are drawn with those obtained for a stagnation layer formed between two point seed plasmas, as well as for single laser produced plasma. An off axis parabolic mirror was used to carry out imaging and spectroscopy along the plasma expansion axis, normal to the target. A simple relay lens system was used for imaging and spectroscopy parallel to the target surface. The former is, to the best of my knowledge, the first time such an investigation into stagnation layers has been undertaken. The targets used were slabs of aluminium with trace amounts of copper. Point, dual colliding and annular colliding plasmas were investigated to determine their relative merits in laser induced breakdown spectroscopy. It found that the limit-of-detection for trace amounts of Cu in Al is lowest for annular plasmas formed at low laser pulse energies of ca. 25 - 30 mJ.
Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 848
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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