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 Development of a Complexity Reduced Collisional Radiative Model for Multiphysics Plasma Simulations written by Richard Jun Espino Abrantes and published by . This book was released on 2018 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of plasma physics on modern technology spans many disciplines beyond the fields of physics and engineering. The fundamental operation of forthcoming plasma physics devices are becoming increasingly complex, producing transient plasma structures and instabilities that can affect any of these devices' nominal performance conditions. One set of underlying physical phenomenon that can impact the plasma evolution in these devices derives from the atomic kinetics. A fully-resolved numerical simulation of these plasma systems involves solving the time-dependent atomic kinetics using a collisional-radiative model. However, a plasma simulation that includes such an atomic model exacerbates the problem's dimensionality because of the resolution of the atomic structure and number of atomic levels that must be resolved. The goal of this dissertation is to develop and implement state-of-the-art complexity reduction techniques to accurately simulate the atomic kinetics in reasonable computational times, without restricting the model to any atomic species or any single application. This approach will enable researchers to assess and analyze complex features of new plasma devices and experiments impacted by atomic kinetics. The collisional-radiative model's rate equations were first extended to include energy equations to study laser-induced breakdown events. This study was used to verify processes affected by energy transfers due to the energy equations' coupling to the atomic state densities' rate equations. Here, multiphoton ionization and inverse Bremsstrahlung were used as the laser source terms to simulate laser-induced breakdown events similar to experimental conditions found in the literature. Once the simulations were deemed sufficient to capture the atomic kinetics observed in breakdown experiments, the entire kinetics model was used as the foundation to implement and investigate the effect of complexity-reduction algorithms. The techniques explored in this work included the quasi-steady-state (QSS) solution, uniform grouping, and Boltzmann grouping. These techniques were then tested against isothermal and Planckian irradiation test cases; amongst all of the reduction algorithms, the Boltzmann grouping technique was found to hold the most promise for its flexible representation of atomic state distributions across a wide range of plasma regimes. The collisional-radiative model's symbiotic connection with atomic codes additionally allows these models to become tools to be used for spectroscopic analysis. Spectral images of chlorine generated for the NLTE-10 workshop verified high-density, high-temperature spectral data obtained from a newly-constructed spectrometer called OHREX. Accurate comparisons were observed among the present findings, results from other collisional-radiative models in the scientific community, and the OHREX experimental data presented at the workshop. Additionally, spectral comparisons between the model and a low-density, low temperature inductively-coupled argon plasma at the Air Force Research Laboratory were attempted. It was found that spectral comparisons were poorly matched as a result of the preferential disposition of atomic codes for high-Z ions. Hence, additional analysis is needed to properly capture detailed atomic kinetics for low-Z applications.
Download or read book An Introduction to the Atomic and Radiation Physics of Plasmas written by G. J. Tallents and published by Cambridge University Press. This book was released on 2018-02-22 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasmas comprise more than 99% of the observable universe. They are important in many technologies and are key potential sources for fusion power. Atomic and radiation physics is critical for the diagnosis, observation and simulation of astrophysical and laboratory plasmas, and plasma physicists working in a range of areas from astrophysics, magnetic fusion, and inertial fusion utilise atomic and radiation physics to interpret measurements. This text develops the physics of emission, absorption and interaction of light in astrophysics and in laboratory plasmas from first principles using the physics of various fields of study including quantum mechanics, electricity and magnetism, and statistical physics. Linking undergraduate level atomic and radiation physics with the advanced material required for postgraduate study and research, this text adopts a highly pedagogical approach and includes numerous exercises within each chapter for students to reinforce their understanding of the key concepts.
Download or read book The Physics of Laser Plasmas and Applications Volume 2 written by Hideaki Takabe and published by Springer Nature. This book was released on with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Collisional radiative Model for Helium like Ions written by Takashi Fujimoto and published by . This book was released on 1983 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Springer Handbook of Atomic Molecular and Optical Physics written by Gordon W. F. Drake and published by Springer Nature. This book was released on 2023-02-09 with total page 1436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprises a comprehensive reference source that unifies the entire fields of atomic molecular and optical (AMO) physics, assembling the principal ideas, techniques and results of the field. 92 chapters written by about 120 authors present the principal ideas, techniques and results of the field, together with a guide to the primary research literature (carefully edited to ensure a uniform coverage and style, with extensive cross-references). Along with a summary of key ideas, techniques, and results, many chapters offer diagrams of apparatus, graphs, and tables of data. From atomic spectroscopy to applications in comets, one finds contributions from over 100 authors, all leaders in their respective disciplines. Substantially updated and expanded since the original 1996 edition, it now contains several entirely new chapters covering current areas of great research interest that barely existed in 1996, such as Bose-Einstein condensation, quantum information, and cosmological variations of the fundamental constants. A fully-searchable CD- ROM version of the contents accompanies the handbook.
Download or read book Collisional radiative Model for a Carbon hydrogen Plasma written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Modeling written by Gianpiero Colonna and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma Modeling: Methods and applications presents and discusses the different approaches that can be adopted for plasma modeling, giving details about theoretical and numerical methods. It describes kinetic models used in plasma investigations, develops the theory of fluid equations and hybrid models, and discusses applications and practical problems across a range of fields. This updated second edition contains over 200 pages of new material, including an extensive new part that discusses methods to calculate data needed in plasma modeling, such as thermodynamic and transport properties, state specific rate coefficients in heavy particle collisions and electron impact cross-sections. This updated research and reference text is an excellent resource to assist and direct students and researchers who want to develop research activity in the field of plasma physics in the choice of the best model for the problem of interest.
Download or read book Plasma Modeling written by Gianpiero Colonna and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Plasma Modeling: Methods and Applications presents and discusses the different approaches that can be adopted for plasma modeling, giving details about theoretical and numerical methods. The book is intended to assist and direct students and researchers, who want to develop research activity in the field of plasma physics, in the choice of the best model for the problem of interest. The book is organised in three parts. The first describes kinetic models used in plasma investigations, consisting of the solution of the Boltzmann equation using different approaches. The second part develops the theory of fluid equations and of hybrid models, and the third part is devoted to applications, considering some practical problems of interest in different fields."--Prové de l'editor.
Download or read book Computational Methods for Collisional Plasma Physics written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling the high density, high temperature plasmas produced by intense laser or particle beams requires accurate simulation of a large range of plasma collisionality. Current simulation algorithms accurately and efficiently model collisionless and collision-dominated plasmas. The important parameter regime between these extremes, semi-collisional plasmas, has been inadequately addressed to date. LLNL efforts to understand and harness high energy-density physics phenomena for stockpile stewardship require accurate simulation of such plasmas. We have made significant progress towards our goal: building a new modeling capability to accurately simulate the full range of collisional plasma physics phenomena. Our project has developed a computer model using a two-pronged approach that involves a new adaptive-resolution, ''smart'' particle-in-cell algorithm: complex particle kinetics (CPK); and developing a robust 3D massively parallel plasma production code Z3 with collisional extensions. Our new CPK algorithms expand the function of point particles in traditional plasma PIC models by including finite size and internal dynamics. This project has enhanced LLNL's competency in computational plasma physics and contributed to LLNL's expertise and forefront position in plasma modeling. The computational models developed will be applied to plasma problems of interest to LLNL's stockpile stewardship mission. Such problems include semi-collisional behavior in hohlraums, high-energy-density physics experiments, and the physics of high altitude nuclear explosions (HANE). Over the course of this LDRD project, the world's largest fully electromagnetic PIC calculation was run, enabled by the adaptation of Z3 to the Advanced Simulation and Computing (ASCI) White system. This milestone calculation simulated an entire laser illumination speckle, brought new realism to laser-plasma interaction simulations, and was directly applicable to laser target physics. For the first time, magnetic fields driven by Raman scatter have been observed. Also, Raman rescatter was observed in 2D. This code and its increased suite of dedicated diagnostics are now playing a key role in studies of short-pulse, high-intensity laser matter interactions. In addition, a momentum-conserving electron collision algorithm was incorporated into Z3. Finally, Z3's portability across diverse MPP platforms enabled it to serve the LLNL computing community as a tool for effectively utilizing new machines.
Download or read book Atomic Processes in Basic and Applied Physics written by Viacheslav Shevelko and published by Springer Science & Business Media. This book was released on 2012-05-31 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is a comprehensive edition which considers the interactions of atoms, ions and molecules with charged particles, photons and laser fields and reflects the present understanding of atomic processes such as electron capture, target and projectile ionisation, photoabsorption and others occurring in most of laboratory and astrophysical plasma sources including many-photon and many-electron processes. The material consists of selected papers written by leading scientists in various fields.
Download or read book Fusion Energy Update written by and published by . This book was released on 1979 with total page 144 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 Vibrationally specific Collisional Radiative Model for Nonequilibrium Nitrogen Plasmas written by Laurent C. Pierrot and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metastable Resolved Collisional radiative Modelling of Spectral Emission from Thermal Plasmas written by William J. Dickson and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kinetic Plasma Modeling with Quiet Monte Carlo Direct Simulation written by and published by . This book was released on 2001 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The modeling of collisions among particles in space plasma media poses a challenge for computer simulation. Traditional plasma methods are able to model well the extremes of highly collisional plasmas (MHD and Hall-MHD simulations) and collisionless plasmas (particle-in-cell simulations). However, neither is capable of trealing the intermediate, semi-collisional regime. The authors have invented a new approach to particle simulation called Quiet Monte Carlo Direct Simulation (QMCDS) that can, in principle, treat plasmas with arbitrary and arbitrarily varying collisionality. The QMCDS method will be described, and applications of the QMCDS method as 'proof of principle' to diffusion, hydrodynamics, and radiation transport will be presented. Of particular interest to the space plasma simulation community is the application of QMCDS to kinetic plasma modeling. A method for QMCDS simulation of kinetic plasmas will be outlined, and preliminary results of simulations in the limit of weak pitch-angle scattering will be presented.
Download or read book Fundamental Atomic Data and Prototype Techniques for a Generalised Collisional radiative Model of Medium weight Elements in Fusion and Astrophysical Plasma written by Matthew M. Bluteau and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantifying the influence of heavy impurities upon plasma power balance, while seizing the opportunities they offer for passive spectroscopy, requires generalised collisional-radiative (GCR) population modelling to produce high-quality ionisation balances and cooling curves. ADAS provides a well-established framework of codes and data for the GCR modelling of light species and has been applied extensively to these scenarios. The extension of GCR modelling to medium and heavyweight elements within the ADAS framework imposes a number of updates and modifications. First, a lift of the ADAS baseline atomic structure and collision data is proposed using autostructure with the distorted-wave approximation, configuration sets selected by optimising on radiated power, and a novel, algorithmic strategy for optimising the radial scaling parameters. The truncation error of the configuration sets is bounded between an order of magnitude and 10%, while three figures of merit prove that the scaling parameter optimisation has eliminated the 20-30% structure error relative to the Cowan code. Second, fully relativistic, partially radiation-damped, Dirac R-matrix calculations of the W44+ ion are performed to showcase the challenges of generating fundamental data for heavy species. The calculations use a configuration interaction and close-coupling expansion that opens up the 3d-subshell, yielding previously unexplored transition arrays, [3d104s2-3d94s24f] and [3d104s2-3d94s4p4d], which contribute 50% of the total radiated line power coefficient (PLT ) near the temperature of peak abundance. Third, collisional excitation by ion projectiles, not just electrons, must now be considered. A broad baseline of ion-impact excitation data is fulfilled by the restoration of a code, a2iratbt, that uses semi-classical, first-order perturbative equations with a limiting function, to prevent transition probability overestimates at intermediate energies, and a radial cutoff, which ensures the xiv infinite-energy Born limit is approached at high energies. The majority of the error in this baseline comes from the neglect of close coupling, accounting for ~ 20% in triplets and
