Measurements of Neutral Density Based on H[alpha] Emissivity in the Alcator C-Mod Divertor PDF Download

Author: Christian Kurz
Publisher:
ISBN:
Category :
Languages : en
Pages : 14

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Author: Brian LaBombard
Publisher:
ISBN:
Category :
Languages : en
Pages : 80

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A specialized arrangement of gas-puff capillaries and in-situ pressure gauges has been installed in Alcator C-Mod to allow gas conductances and flows around divertor structures to be measured with or without plasma present in the chamber. Results are presented from a series of dedicated experiments performed during the 1020725 run day (MP#313, "Instrumented Divertor Leakage Experiments"). Gas conductances and flows are compiled in this report with the aim of providing good benchmark points for numerical simulations of gas flow and "plasma plugging" physics in Alcator C-Mod. A strong plasma plugging effect is found at locations where the divertor structure is opened for diagnostics access (the so-called "open-port" locations), as evidenced by a factor of [approx.] 4 reduction in the local gas conductance with plasma present. The effect is most dramatic for locations in the upper chamber region where there is no neutral baffle structure; a factor of [approx.] 5 reduction in the local gas conductance is found there. Gas conductance through an open divertor flap is measured to be a factor of [approx.] 3 lower than that which has been commonly assumed using the area of the open flap. The conductance through the flap is found to be similar with or without plasma present, indicating that there is no "plasma plugging" effect occurring at this location. The gas flow rate through a flap that is adjacent to an "open-port" location is found to be a factor of 2 lower than at a location distant from open ports. The latter result suggests that significant toroidal variations in the pressures exist under the lower divertor modules.

Author: A. Niemczewski
Publisher:
ISBN:
Category :
Languages : en
Pages : 21

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Author: Ratko K. Janev
Publisher: Springer Science & Business Media
ISBN: 364271935X
Category : Science
Languages : en
Pages : 322

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Atomic and molecular processes play an important role in laboratory and astrophysical plasmas for a wide range of conditions, and determine, in part, their electrical, transport, thermal, and radiation properties. The study of these and other plasma properties requires a knowledge of the cross sections, reaction rate coefficients, and inelastic energy transfers for a variety of collisional reactions. In this review, we provide quantitative information about the most important collision processes occurring in hy drogen, helium, and hydrogen-helium plasmas in the temperature range from 0. 1 eV to 20 keY. The material presented here is based on published atomic and molecular collision data, theoretical calculations, and appro priate extrapolation and interpolation procedures. This review gives the properties of each reaction, graphs of the cross sections and reaction rate coeffiCients, and the coefficients of analytical fits for these quantities. We present this information in a form that will enable researchers who are not experts in atomic physics to use the data easily. The authors thank their colleagues at the Princeton Plasma Physics Laboratory and in the atomic physics community who have made many useful suggestions for the selection and presentation o. f t. he material. We gratefully acknowledge the excellent technical assistance of Elizabeth Carey for the typing, and Bernie Giehl for the drafting. This work was supported in part by the U. S. Department of Energy Contract No. DE-AC02-76-CHO-3073. Princeton, USA R. K. Janev W. D. Langer September, 1987 K. Evans, Jr. , D. E.

Author: David S. Mueller
Publisher: CreateSpace
ISBN: 9781500222666
Category : Technology & Engineering
Languages : en
Pages : 82

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The mission of the U.S. Geological Survey (USGS) Water Resources Discipline is to provide the information and understanding needed for wise management of the Nation's water resources. Inherent in this mission is the responsibility of collecting data that accurately describe the physical, chemical, and biological attributes of water systems. These data are used for environmental and resource assessments by the USGS, other government agencies and scientific organizations, and the general public. Reliable and quality-assured data are essential to the credibility and impartiality of the water-resources appraisals carried out by the USGS.

Author: Marshall N. Rosenbluth
Publisher: Springer Science & Business Media
ISBN: 9781563961311
Category : Science
Languages : en
Pages : 514

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Market: Scientists and students involved in thermonuclear fusion research. Thermonuclear fusion research using the confinement device tokamak represents one of the most prominent science projects in the second half of the 20th century. International Tokamak Community is now committing significant effort and funds to experiments with burning plasma, hot and dense enough to produce significant nuclear fusion reactions. The methods used to enhance tokamak performance have a profound and immediate effect on machine design. This book provides an up-to-date account of research in tokamak fusion and puts forward innovative ideas in confinement physics.

Author: Jeffrey P. Freidberg
Publisher: Cambridge University Press
ISBN: 1139462156
Category : Science
Languages : en
Pages : 6

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There has been an increase in interest worldwide in fusion research over the last decade and a half due to the recognition that a large number of new, environmentally attractive, sustainable energy sources will be needed to meet ever increasing demand for electrical energy. Based on a series of course notes from graduate courses in plasma physics and fusion energy at MIT, the text begins with an overview of world energy needs, current methods of energy generation, and the potential role that fusion may play in the future. It covers energy issues such as the production of fusion power, power balance, the design of a simple fusion reactor and the basic plasma physics issues faced by the developers of fusion power. This book is suitable for graduate students and researchers working in applied physics and nuclear engineering. A large number of problems accumulated over two decades of teaching are included to aid understanding.

Author: Basudev Ghosh
Publisher:
ISBN: 9781842658567
Category : Science
Languages : en
Pages : 0

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BASIC PLASMA PHYSICS is designed to serve as an introductory compact textbook for advanced undergraduate, postgraduate and research students taking plasma physics as one of their subject of study for the first time. It covers the current syllabus of plasma physics offered by the most universities and technical institutions. The book requires no background in plasma physics but only elementary knowledge of basic physics and mathematics. Emphasis has been given on the analytical approach. Topics are developed from first principle so that the students can learn through self-study. One chapter has been devoted to describe some practical aspects of plasma physics. Each chapter contains a good number of solved and unsolved problems and a variety of review questions, mostly taken from recent examination papers. Some classroom experiments described in the book will surely help students as well as instructors.

Author: Heinz Knoepfel
Publisher: Springer
ISBN: 1475718896
Category : Technology & Engineering
Languages : en
Pages : 425

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Book Description
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.

Author: Howard B. Schonberger
Publisher: Kent State University Press
ISBN: 9780873383820
Category : History
Languages : en
Pages : 364

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Book Description
Index and bibliography included.