Download or read book Plasma Spectroscopic Diagnostic Tool Using Collisional radiative Models and Its Application to Different Plasma Discharges for Electron Temperature and Neutral Density Determination written by Ella Marion Sciamma and published by . This book was released on 2007 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: A spectroscopic diagnostic tool has been developed to determine the electron temperature and the neutral density in helium, hydrogen and argon plasmas from absolutely calibrated spectroscopic measurements. For each gas, a method of analysis which uses models specific to each species present in the plasma (neutral atom or singly ionized atom) has been defined. The experimental electron density is used as an input parameter to the models, and the absolutely calibrated spectroscopic data are processed beforehand to obtain the populations of the upper excited levels corresponding to the observed spectral lines. For helium plasmas, the electron temperature is inferred from the experimental helium ion excited level p = 4 population using a corona model, and then the neutral density is determined from the experimental helium neutral excited level populations using a collisional-radiative model for helium neutrals. For hydrogen plasmas, combinations of the electron temperature and the neutral density are determined from the experimental hydrogen neutral excited level populations using a collisional-radiative model specific to hydrogen atoms. For argon plasmas, the electron temperature is inferred from the experimental argon ion excited level populations using a collisional-radiative model for argon ions, and then the neutral density is determined from the experimental argon neutral excited level populations using a collisional-radiative model for argon neutrals. This diagnostic tool was applied to three experiments with different geometries and plasma conditions to test the validity of each data analysis method. The helium and hydrogen data analysis methods were tested and validated on helium and hydrogen plasmas produced in the VASIMR experiment, a plasma propulsion system concept. They gave electron temperatures and neutral densities that were consistent with other diagnostics and theory. The argon diagnostic tool was tested on argon plasmas produced in the VASIMR experiment, the Helimak experiment and the Helicon experiment. The electron temperature and neutral density obtained on both the Helimak and the Helicon experiments were consistent with other diagnostics and with theory, and validated the method of analysis. An impurity problem on the VASIMR experiment made it difficult for the data analysis to be validated.
Download or read book Plasma Diagnostics written by Orlando Auciello and published by Academic Press. This book was released on 2013-10-22 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma Diagnostics, Volume 1: Discharge Parameters and Chemistry covers seven chapters on the important diagnostic techniques for plasmas and details their use in particular applications. The book discusses optical diagnostic techniques for low pressure plasmas and plasma processing; plasma diagnostics for electrical discharge light sources; as well as Langmuir probes. The text also describes the mass spectroscopy of plasmas, microwave diagnostics, paramagnetic resonance diagnostics, and diagnostics in thermal plasma processing. Electrical engineers, nuclear engineers, microwave engineers, chemists, and technical personnel in universities, industry, and national laboratories will find the book invaluable.
Download or read book Modern Methods in Collisional Radiative Modeling of Plasmas written by Yuri Ralchenko and published by Springer. This book was released on 2016-02-25 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a compact yet comprehensive overview of recent developments in collisional-radiative (CR) modeling of laboratory and astrophysical plasmas. It describes advances across the entire field, from basic considerations of model completeness to validation and verification of CR models to calculation of plasma kinetic characteristics and spectra in diverse plasmas. Various approaches to CR modeling are presented, together with numerous examples of applications. A number of important topics, such as atomic models for CR modeling, atomic data and its availability and quality, radiation transport, non-Maxwellian effects on plasma emission, ionization potential lowering, and verification and validation of CR models, are thoroughly addressed. Strong emphasis is placed on the most recent developments in the field, such as XFEL spectroscopy. Written by leading international research scientists from a number of key laboratories, the book offers a timely summary of the most recent progress in this area. It will be a useful and practical guide for students and experienced researchers working in plasma spectroscopy, spectra simulations, and related fields.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976-05 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diagnostics of a Flowing High Power Argon Helicon Plasma with a Magnetic Nozzle written by Matthew D. Wiebold and published by . This book was released on 2008 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1969 with total page 1090 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1979 with total page 1254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1977 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 1030 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusion Energy Update written by and published by . This book was released on 1978 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigations on Spectroscopic Diagnostic of High Z Elements in Fusion Plasmas written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear fusion of deuterium and Tritium relies on the accomplishment of plasma temperatures in the range of 20keV. In magnetic confinement fusion, the heat transport and radiation losses are compensated by plasma heating. This scheme relies on the control of the loss mechanisms and in particular the plasma radiation. Tungsten (W) is the main candidate for the first wall of a reactor due to its robustness against physical sputtering by the plasma ions, however, when W reaches concentrations of 1E-4 in the plasma, it causes unduly large plasma cooling by radiation. This implies restrictive impurity control for W, which needs reliable diagnostic by plasma spectroscopy. A pre-requisite for interpretation of the W-spectra is the availability of atomic data for W. The most intense spectral lines of highly ionized W are emitted in the VUV and soft X-ray range. To perform calculations on atomic data the code packages incorporated in the ADAS project are used. The electronic structure of nearly all W-ions is calculated by the Cowan-code (Hartree-Fock algorithm). In a second step, the cross sections for electron impact excitation are evaluated via the Cowan-code using the plane wave Born-approximation. A detailed collisional-radiative model is employed to calculate the model-spectra for each ion in equilibrium. Finally, ionization and recombination rates of W are evaluated by semi-empirical formulae, which make use of the electronic structure calculations of the Cowan-code. All atomic data are confronted with experimental measurements from the Garching tokamak ASDEX Upgrade and the Berlin electron-beam ion trap (EBIT). The experimental investigations extend up to 5keV electron temperatures, which is the maximum of the routine operation at ASDEX Upgrade. 'Impurity accumulation', which is characterized by a strong peaking of the impurity density profile, enables unique investigations on the fractional abundance of Ag-like W27+ up to Co-like W47+. According to this findings diff.
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1976 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Diagnostics written by W. Lochte-Holtgreven and published by American Institute of Physics. This book was released on 1995 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt: Market: Plasma physicists and students. Upon publication in 1968, Plasma Diagnostics represented the most up- to-date survey of the experimental methods used in plasma analysis, including the necessary theoretical background. This work emphasizes spectroscopic techniques along with in-depth sections on laser techniques and electric and magnetic probe methods. The evaluation of collision and transport cross sections, heat and electrical conductivity, and viscosity are some of the many applications of plasma diagnostics reviewed as well. This long-awaited reprint volume is of interest to both physicists and students of theoretical physics as it deals with plasma theory from a fundamental point of view, stressing a careful derivation and discussion of the equations.
Download or read book Cities and Their Vital Systems written by Advisory Committee on Technology and Society and published by National Academies Press. This book was released on 1989 with total page 1298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cities and Their Vital Systems asks basic questions about the longevity, utility, and nature of urban infrastructures; analyzes how they grow, interact, and change; and asks how, when, and at what cost they should be replaced. Among the topics discussed are problems arising from increasing air travel and airport congestion; the adequacy of water supplies and waste treatment; the impact of new technologies on construction; urban real estate values; and the field of "telematics," the combination of computers and telecommunications that makes money machines and national newspapers possible.
Download or read book Fusion Nucl aire written by and published by . This book was released on 2006-05 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt:
