Spectroscopic Diagnostics Of Magnetic Fusion Plasmas
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Spectroscopic Diagnostics Of Magnetic Fusion Plasmas
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Author : R. Neu
language : en
Publisher:
Release Date : 2010
Spectroscopic Diagnostics Of Magnetic Fusion Plasmas written by R. Neu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Spectroscopic Diagnostic Of Magnetic Fusion Plasmas
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Author : Mutia Meireni
language : en
Publisher:
Release Date : 2019
Spectroscopic Diagnostic Of Magnetic Fusion Plasmas written by Mutia Meireni and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
This thesis focuses on the modeling of the atomic line radiation emitted by magnetic fusion plasmas for diagnostic purposes. An improvement of the accuracy of diagnostics is proposed, in order to have a better characterization of runaway electrons in the context of ITER preparation. In the first chapter, we discuss about fusion reaction, about how it is produced in tokamak machines, and we discuss about the disruptions, which are a consequence of instabilities. They are one cause of runaway electrons. In the second chapter, the formalism used in spectral line broadening models is introduced based on quantum mechanics and statistical physics. Numerical calculations are also presented. They are done for applications to synthetic diagnostics in tokamak divertor plasma conditions. Hydrogen Balmer lines with a moderate principal quantum number are considered. In the third chapter, we discuss the physics underlying Langmuir waves. This includes the Landau damping process and its inverse counterpart, the plasma-beam instability mechanism. It is possible to calculate the magnitude of the electric field which is created by a beam of electrons using the quasilinear theory. We present this theory and we present a generalization to strongly nonlinear regimes for which the Langmuir waves are coupled with the ion sound and electromagnetic waves. Finally, we discuss this model and, next, apply the formalism for different beam densities in tokamak edge plasmas and we examine the possibility for making a diagnostic of runaway electrons based on atomic spectroscopy in the fourth chapter.
Synthetic Diagnostics For Plasma Spectroscopy Of Magnetic Fusion Devices
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Author : Roshin Raj Sheeba
language : en
Publisher:
Release Date : 2019
Synthetic Diagnostics For Plasma Spectroscopy Of Magnetic Fusion Devices written by Roshin Raj Sheeba and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
In this thesis, a numerical tool is elaborated by combining a Stark lineshape code with another code developed for the calculation of the recombination continuum due to bound-free and free-free transitions. The tool is intended to model whole Balmer spectra emitted by hydrogen or deuterium atoms for tokamak divertor plasma conditions with a focus on recombining plasmas (detachment regime). In addition to Stark line broadening, the plasma environment affects hydrogen atoms by lowering the ionization potential leading to the advance of the continuum. For hydrogen emission, these statistical plasma effects are retained using the dissolution factor approach which allows the modeling of the gradual line merging into the continuum. In this approach, bound levels are considered as free levels beyond a critical level depending on the plasma parameters. The approach is implemented by extending the continuum beyond the theoretical series limit and transforming bound levels to free ones. For simplicity, beyonf the Inglis-Teller limit, the profiles of the Balmer lines are extrapolated from that of the last resolved line. For low electron densities, the line intensities are calculated using a collisional-radiative model. The numerical tool was checked by comparison with an experimental spectrum from literature. The numerical tool was applied to predict synthetic spectra for WEST using spatial distributions of the hydrogen density and of the plasma parameters simulated along viewing chords by the transport code SOLEDGE2D-EIRENE. This approach of synthetic diagnostics of plasma spectroscopy, can easily be extended for efficient predictions for future fusion devices like ITER and DEMO.
Diagnostics Of Laboratory And Astrophysical Plasmas Using Spectral Lineshapes Of One Two And Three Electron Systems
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Author : Eugene Oks
language : en
Publisher: World Scientific
Release Date : 2017-03-24
Diagnostics Of Laboratory And Astrophysical Plasmas Using Spectral Lineshapes Of One Two And Three Electron Systems written by Eugene Oks and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-03-24 with Science categories.
The book presents an advanced tool for experimentalists using spectral lineshapes for diagnostics of laboratory or astrophysical plasmas, and for theorists helping the experimentalists in interpreting the experimental line profiles. It significantly expands the scope of parameters of plasmas and/or fields in it that can be measured. For some parameters, the book presents new, more advanced diagnostic methods than the methods covered in the previous books.
Investigations On Spectroscopic Diagnostic Of High Z Elements In Fusion Plasmas
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Author :
language : en
Publisher:
Release Date : 2005
Investigations On Spectroscopic Diagnostic Of High Z Elements In Fusion Plasmas written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
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.
Plasma Diagnostics
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Author : Orlando Auciello
language : en
Publisher: Academic Press
Release Date : 2013-10-22
Plasma Diagnostics written by Orlando Auciello and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-22 with Science categories.
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.
Extreme Ultraviolet And Soft X Ray Diagnostics Of High Temperature Plasmas
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Author :
language : en
Publisher:
Release Date : 1986
Extreme Ultraviolet And Soft X Ray Diagnostics Of High Temperature Plasmas written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
This report describes recent progress and plans for calendar year 1987 in the Johns Hopkins University program to develop and improve spectroscopic diagnostics for the high temperature plasmas used in magnetic fusion research. An EUV spectrograph which provides time resolved spectra along fifteen chords of a plasma device has been completed and evaluation on DIII-D will began in late 1986. Other instrumentation work includes the evaluation of a sensitive detector for ion temperature/velocity distribution determinations and a feasibility study of Zeeman polarimetry for determining magnetic fields. A comprehensive data set taken on the TEXT tokamak is undergoing analysis as a means of improving the ionic parameters used in diagnostic studies and to expand the capabilities of existing instruments. Potential new advanced in spectroscopic technology are being monitored to determine if they provide advantages for fusion research.
Extreme Ultraviolet And Soft X Ray Diagnostics Of High Temperature Plasmas Progress Report
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Author :
language : en
Publisher:
Release Date : 1986
Extreme Ultraviolet And Soft X Ray Diagnostics Of High Temperature Plasmas Progress Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
This report describes recent progress and plans for calendar year 1987 in the Johns Hopkins University program to develop and improve spectroscopic diagnostics for the high temperature plasmas used in magnetic fusion research. An EUV spectrograph which provides time resolved spectra along fifteen chords of a plasma device has been completed and evaluation on DIII-D will began in late 1986. Other instrumentation work includes the evaluation of a sensitive detector for ion temperature/velocity distribution determinations and a feasibility study of Zeeman polarimetry for determining magnetic fields. A comprehensive data set taken on the TEXT tokamak is undergoing analysis as a means of improving the ionic parameters used in diagnostic studies and to expand the capabilities of existing instruments. Potential new advanced in spectroscopic technology are being monitored to determine if they provide advantages for fusion research.
Advanced Diagnostics For Magnetic And Inertial Fusion
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Author : Peter E. Stott
language : en
Publisher: Springer Science & Business Media
Release Date : 2011-06-28
Advanced Diagnostics For Magnetic And Inertial Fusion written by Peter E. Stott and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-06-28 with Science categories.
Proceedings of the International Conference on Advanced Diagnostics for Magnetic and Inertial Fusion, held September 3-7, 2001 at Villa Monastero, Varenna, Italy. This volume focuses on future diagnostic requirements for fusion energy research emphasizing advanced diagnostics, new techniques and areas where further progress is required.
Fusion Plasma Diagnostics With Mm Waves
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Author : Hans-Jürgen Hartfuß
language : en
Publisher: John Wiley & Sons
Release Date : 2013-08-22
Fusion Plasma Diagnostics With Mm Waves written by Hans-Jürgen Hartfuß and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-08-22 with Science categories.
Filling a gap in the literature, this introduction to the topic covers the physics of the standard microwave diagnostics established on modern fusion experiments, and the necessary technological background from the field of microwave engineering. Written by well-known mm-wave diagnosticians in the field of fusion physics, the textbook includes such major diagnostic techniques as electron cyclotron emission, interferometry, reflectometry, polarimetry, and scattering.