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Author : Cedric Kar-Wai Tsui
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Measuring the Inboard Side Scrape-off Layer of DIII-D Plasmas Using Swing-probes written by Cedric Kar-Wai Tsui and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. Watkins
Publisher :
ISBN 13 :
Total Pages : 2 pages
Book Rating : 4.:/5 (316 download)
Download or read book Far Scrape-Off Layer and Near Wall Plasma Studies in DIII-D. written by J. Watkins and published by . This book was released on 2004 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: Far scrape-off layer (SOL) plasma parameters in DIII-D depend strongly on the discharge density and confinement regime. In L-mode, cross-field transport increases with the average discharge density and elevates the far SOL density, thus increasing plasma-wall contact. Far SOL density near the low field side (LFS) of the main chamber wall also increases with decreasing plasma current and with decreasing outer wall gap. In H-mode, between edge localized modes (ELMs), plasma-wall contact is weaker than in L-mode. During ELMs plasma fluxes to the LFS wall increase to, or above the L-mode levels. A large fraction of the net cross-field fluxes is convected through the SOL by large amplitude intermittent transport events. In high density L-mode and during ELMs in H-mode, intermittent events propagate all the way to the LFS wall and may cause sputtering.
Author :
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (683 download)
Download or read book DIII-D Data for Modeling the Scrape-off-layer Plasma written by and published by . This book was released on 1989 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: We are in the process of assembling a database of edge and divertor plasma parameters suitable for use in benchmarking tious 2D models of the scrape-off- layer (SOL) plasma. Also, we are using the Braams B2 code to derive transport coefficients for the edge plssma. In parallel, work is starting on an upgrade to the B2 code that includes padlel current flow and EXB drifts. These efforts are directed at increasing the confidence level of models of the tokamak edge plasma so that we can predict the effect of planned upgrades to DIII-D (e.g., the Advanced Divertor Program) and the performance of next generation machines such as CIT or ITER, where initial design studies show that plasma conditions at the divertor targets can have a large impact on the lifetime and cost of the machine. This report summarizes our recent progress in characterizing the DIII-D SOL plasma and in modeling these data with the the B2 code. Section I contains a brief description of the diagnostics available for characterizing the SOL plasma. In Section II we present our measurements of the SOL parameters for H-mode plasmas. This includes data showing how the divertor plasma parameters (n{sub e}(r), T{sub e}(r), and Q(r)) vary from ohmic to L-mode to H-mode, and power balance for quasi-stationary H-mode plasmas. Section III covers divertor-target heat-flux asymmetries for double and single null operation with forward and reversed toroidal field. In Section IV we show the scaling of L-mode parameters with neutral beam power, and Section V concludes with a summary of the results obtained from the Braams B2 SOL simulation code.
Download or read book Modeling The Effect of Drifts on the Edge, Scrape-Off Layer, and Divertor Plasma in DIII-D. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Simulations of plasmas with a DIII-D shape indicate plasma drifts are important at power levels near the L- to H-mode plasma transition. In addition to enhancing plasma flows in the divertor region, drifts are found to play a key role in establishing highly sheared radial electric fields in the edge of the confined plasma, for the physics of the high confinement operating mode (H-mode). Measurements of the plasma structure in the vicinity of the X-point of DIII-D indicate the importance of drifts on plasma flow between the scrape-off layer (SOL) and closed field lines. The large electric fields provide large flows around the X-point, and these are conjectured to play a role in the transition from L- to H-mode confinement. These results indicate the relevance of modeling the edge and SOL plasmas of present tokamak devices using models which include E x B, (nabla)B, and pressure gradient drifts. The results of simulation of specific DIII-D discharges is reported in this paper. They start with discussion of the simulation of an Ohmic discharge in Section 2, including a study of the effect of varying several operational parameters. Simulation of a higher triangularity L-mode discharge is discussed in Section, and a summary is given in Section 4.
Author : John David Elder
Publisher :
ISBN 13 : 9780494393710
Total Pages : 155 pages
Book Rating : 4.3/5 (937 download)
Download or read book Toroidally Symmetric Methane Injection Into the Main Scrape-off Layer of DIII-D written by John David Elder and published by . This book was released on 2007 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2003 and 2005 13CH4 puffing experiments were conducted on DIII-D [1] in L and ELMy H mode plasmas respectively. The motivation for these experiments was to develop a greater understanding of impurity creation, transport and deposition for hydrocarbons which are produced at the walls of DIII-D by chemical sputtering. In both experiments, tiles from around the vessel were removed after the experiment was complete and the distribution of the 13C deposition was measured using nuclear reaction analysis. During each of these experiments the plasma conditions and emissions were monitored by a number of direct and spectroscopic diagnostics including Langmuir probes, Thomson scattering, the multichord divertor spectrometer, filterscopes, reciprocating probes and others. These diagnostic measurements are used in the thesis to develop a background plasma solution for the experiments through the procedure of empirical plasma reconstruction. These background plasma solutions are used as the basis for modeling the emissions, transport and deposition of the 13C resulting from the breakup of 13CH4 using the OEDGE code. OEDGE was enhanced by the addition of improved methane breakup kinetics models, improved peripheral particle transport, improved support for line profile modeling as well as many other features. The modeling successfully reproduces most of the spectroscopic measurements as well as the observed 13C deposition patterns in both distribution and magnitude. In order to match the experimental results, fast parallel transport in the SOL had to be imposed on the carbon ions. In addition, a radial pinch was required in the SOL for both the L and H mode experiments to move the carbon closer to the separatrix so that it could deposit where it was measured experimentally. Without both of these flows the simulations were unable to replicate the experimental observations. The effects of radial variation in the parallel flow and erosion of deposited 13C were also both investigated. It was found that neither of these processes by itself appears to be capable of replicating the experimental results.
Author : Masahiro Wakatani
Publisher : Oxford University Press, USA
ISBN 13 : 9780195078312
Total Pages : 462 pages
Book Rating : 4.0/5 (783 download)
Download or read book Stellarator and Heliotron Devices written by Masahiro Wakatani and published by Oxford University Press, USA. This book was released on 1998 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph describes plasma physics for magnetic confinement of high temperature plasmas in nonaxisymmetric toroidal magnetic fields or stellarators. The techniques are aimed at controlling nuclear fusion for continuous energy production. While the focus is on the nonaxisymmetric toroidal field, or heliotron, developed at Kyoto University, the physics applies equally to other stellarators and axisymmetric tokamaks. The author covers all aspects of magnetic confinement, formation of magnetic surfaces, magnetohydrodynamic equilibrium and stability, single charged particle confinement, neoclassical transport and plasma heating. He also reviews recent experiments and the prospects for the next generation of devices.
Author : Fritz Riehle
Publisher : John Wiley & Sons
ISBN 13 : 3527605959
Total Pages : 540 pages
Book Rating : 4.5/5 (276 download)
Download or read book Frequency Standards written by Fritz Riehle and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of all measurement units, frequency is the one that may be determined with the highest degree of accuracy. It equally allows precise measurements of other physical and technical quantities, whenever they can be measured in terms of frequency. This volume covers the central methods and techniques relevant for frequency standards developed in physics, electronics, quantum electronics, and statistics. After a review of the basic principles, the book looks at the realisation of commonly used components. It then continues with the description and characterisation of important frequency standards from atomic clocks, to frequency stabilised lasers. The whole is rounded of with a discussion of topical applications in engineering, telecommunications, and metrology.
Author : James J. Haggerty
Publisher :
ISBN 13 : 9780160453687
Total Pages : 138 pages
Book Rating : 4.4/5 (536 download)
Download or read book Spinoff 1994 written by James J. Haggerty and published by . This book was released on 1994 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Klaus Grasshoff
Publisher : John Wiley & Sons
ISBN 13 : 3527613994
Total Pages : 632 pages
Book Rating : 4.5/5 (276 download)
Download or read book Methods of Seawater Analysis written by Klaus Grasshoff and published by John Wiley & Sons. This book was released on 2009-07-30 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the book first appeared in 1976, Methods of Seawater Analysis has found widespread acceptance as a reliable and detailed source of information. Its second extended and revised edition published in 1983 reflected the rapid pace of instrumental and methodological evolution in the preceding years. The development has lost nothing of its momentum, and many methods and procedures still suffering their teething troubles then have now matured into dependable tools for the analyst. This is especially evident for trace and ultra-trace analyses of organic and inorganic seawater constituents which have diversified considerably and now require more space for their description than before. Methods to determine volatile halocarbons, dimethyl sulphide, photosynthetic pigments and natural radioactive tracers have been added as well as applications of X-ray fluorescence spectroscopy and various electrochemical methods for trace metal analysis. Another method not previously described deals with the determination of the partial pressure of carbon dioxide as part of standardised procedures to describe the marine CO2 system.
Author : Jeffrey P. Freidberg
Publisher : Cambridge University Press
ISBN 13 : 1107006252
Total Pages : 743 pages
Book Rating : 4.1/5 (7 download)
Download or read book Ideal MHD written by Jeffrey P. Freidberg and published by Cambridge University Press. This book was released on 2014-06-26 with total page 743 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive, self-contained, and clearly written, this book describes the macroscopic equilibrium and stability of high temperature plasmas.
Author : Ping Xia, PhD
Publisher : Springer Publishing Company
ISBN 13 : 161705240X
Total Pages : 274 pages
Book Rating : 4.6/5 (17 download)
Download or read book Physics in Radiation Oncology Self-Assessment Guide written by Ping Xia, PhD and published by Springer Publishing Company. This book was released on 2015-09-08 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide & companion to the Radiation Oncology Self-Assessment Guide is a comprehensive physics review for anyone in the field of radiation oncology looking to enhance their knowledge of medical physics. It covers in depth the principles of radiation physics as applied to radiation therapy along with their technical and clinical applications. To foster retention of key concepts and data, the resource utilizes a user-friendly ìflash cardî question and answer format with over 800 questions. The questions are supported by detailed answers and rationales along with reference citations for source information. The Guide is comprised of 14 chapters that lead the reader through the radiation oncology physics field, from basic physics to current practice and latest innovations. Aspects of basic physics covered include fundamentals, photon and particle interactions, and dose measurement. A section on current practice covers treatment planning, safety, regulations, quality assurance, and SBRT, SRS, TBI, IMRT, and IGRT techniques. A chapter unique to this volume is dedicated to those topics in diagnostic imaging most relevant to radiology, including MRI, ultrasound, fluoroscopy, mammography, PET, SPECT, and CT. New technologies such as VMAT, novel IGRT devices, proton therapy, and MRI-guided therapy are also incorporated. Focused and authoritative, this must-have review combines the expertise of clinical radiation oncology and radiation physics faculty from the Cleveland Clinic Taussig Cancer Institute. Key Features: Includes more than 800 questions with detailed answers and rationales A one-stop guide for those studying the physics of radiation oncology including those wishing to reinforce their current knowledge of medical physics Delivered in a ìflash cardî format to facilitate recall of key concepts and data Presents a unique chapter on diagnostic imaging topics most relevant to radiation oncology Content provided by a vast array of contributors, including physicists, radiation oncology residents, dosimetrists, and physicians About the Editors: Andrew Godley, PhD, is Staff Physicist, Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland OH Ping Xia, PhD, is Head of Medical Physics and Professor of Molecular Medicine, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH.
Author : Ian Lerche
Publisher : Springer Science & Business Media
ISBN 13 : 354029709X
Total Pages : 346 pages
Book Rating : 4.5/5 (42 download)
Download or read book Environmental Risk Assessment written by Ian Lerche and published by Springer Science & Business Media. This book was released on 2007-04-03 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores environmental and human risk problems caused by contamination, from the perspective of real world applications with quantitative procedures. It includes risk methods for environmental problems where data are sparse or fuzzy, and incorporates political, social and economic considerations in determining directions of remediation solutions for environmental contaminant problems. It highlights the impact of contaminants on human health – sometimes fatal - and the anthropogenic exacerbation of natural processes.
Author : Norman Herr
Publisher : John Wiley & Sons
ISBN 13 : 0787972983
Total Pages : 614 pages
Book Rating : 4.7/5 (879 download)
Download or read book The Sourcebook for Teaching Science, Grades 6-12 written by Norman Herr and published by John Wiley & Sons. This book was released on 2008-08-11 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Sourcebook for Teaching Science is a unique, comprehensive resource designed to give middle and high school science teachers a wealth of information that will enhance any science curriculum. Filled with innovative tools, dynamic activities, and practical lesson plans that are grounded in theory, research, and national standards, the book offers both new and experienced science teachers powerful strategies and original ideas that will enhance the teaching of physics, chemistry, biology, and the earth and space sciences.
Author : Jeffrey P. Freidberg
Publisher : Springer
ISBN 13 : 9781475708387
Total Pages : 489 pages
Book Rating : 4.7/5 (83 download)
Download or read book Ideal Magnetohydrodynamics written by Jeffrey P. Freidberg and published by Springer. This book was released on 2013-11-20 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alex Hebra
Publisher : Springer Science & Business Media
ISBN 13 : 3211783814
Total Pages : 392 pages
Book Rating : 4.2/5 (117 download)
Download or read book The Physics of Metrology written by Alex Hebra and published by Springer Science & Business Media. This book was released on 2010-04-06 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conceived as a reference manual for practicing engineers, instrument designers, service technicians and engineering students. The related fields of physics, mechanics and mathematics are frequently incorporated to enhance the understanding of the subject matter. Historical anecdotes as far back as Hellenistic times to modern scientists help illustrate in an entertaining manner ideas ranging from impractical inventions in history to those that have changed our lives.
Author : Nihal Kularatna
Publisher : IET
ISBN 13 : 0852969996
Total Pages : 677 pages
Book Rating : 4.8/5 (529 download)
Download or read book Digital and Analogue Instrumentation written by Nihal Kularatna and published by IET. This book was released on 2003 with total page 677 pages. Available in PDF, EPUB and Kindle. Book excerpt: A substantial update of his earlier IEE book, Modern Electronic Test and Measuring Instruments, the author provides a state-of-the art review of modern families of digital instruments. For each family he covers internal design, use and applications, highlighting their advantages and limitations from a practical application viewpoint.The book also treats new digital instrument families such as DSOs, Arbitrary Function Generators, FFT analysers and many other common systems used by the test engineers, designers and research scientists.
Author : Heinz Knoepfel
Publisher : Springer
ISBN 13 : 1475718896
Total Pages : 425 pages
Book Rating : 4.4/5 (757 download)
Download or read book Tokamak Start-Up: Problems and Scenarios Related to the Transient Phases of a Thermonuclear Fusion Reactor (Ettor Majorana International Science Series) written by Heinz Knoepfel and published by Springer. This book was released on 2013-12-19 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the papers presented at the Course on "Tokamak Startup - Problems and Scenarios Related to the Transient Phases of a Thermonuclear Fusion Reactor" which was held in Erice, July 14-20, 1985. The fact that the critical startup and transient phases of a tokamak reactor are now the specific subject of a comprehensive international gathering of fusion specialists seems indicative of the substantial pro gress made in recent years towards attaining controlled ignition of a nuclear fusion fuel, i.e. towards demonstrating the scientific feasibili ty of controlled thermonuclear fusion. In fact, the steady-state burning phase has attracted so far most of the attention of fusion physicists and engineers, as it is conceptually more rewarding, and theoretically easier to handle. However, as for many large engineering systems, - nuclear fis- ... ':1' " . 10 ' ... Entrance to San Rocco's lecturing hall v sion power plants, or aerospace crafts, for example - the major issues of design and operation lie often in the startup, shutdown and power tran sieQt phases, rather than at the full load, or at cruising regimes. In ehoosing the contributions to this 7th Course of Prof. B.
