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Magnetohydrodynamics of Plasma Relaxation

1993 Science
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Release : 1993
Genre : Science
Kind : eBook
Book Rating : 608/5 ( reviews)

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Book Synopsis Magnetohydrodynamics of Plasma Relaxation by : S. Ortolani

Download or read book Magnetohydrodynamics of Plasma Relaxation written by S. Ortolani. This book was released on 1993. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a concise description of the phenomenon of plasma relaxation from the point of view of resistive magnetohydrodynamic (MHD) theory. Magnetized plasmas relax when they seek their natural state of lowest energy subject to certain topological constraints imposed by the magnetic field. Relaxation may be fast and dynamic or slow and gradual depending on the external environment in which the magnetoplasma system evolves. Relaxation occurs throughout the universe and may describe such diverse phenomena as dynamos, solar flares, and the operation of magnetic fusion energy experiments. This book concentrates on the dynamic, rather than variational aspects of relaxation. While the processes described are general, the book focuses on the reversed-field pinch experiment as a paradigm for plasma relaxation and dynamo action. Examples from other branches of plasma physics are also discussed. The authors draw upon their extensive experience in numerical and experimental studies of relaxation.

The Magnetohydrodynamics Of Plasma Relaxation

1993-03-16 Science
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Release : 1993-03-16
Genre : Science
Kind : eBook
Book Rating : 838/5 ( reviews)

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Book Synopsis The Magnetohydrodynamics Of Plasma Relaxation by : Sergio Ortolani

Download or read book The Magnetohydrodynamics Of Plasma Relaxation written by Sergio Ortolani. This book was released on 1993-03-16. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a concise description of the phenomenon of plasma relaxation from the point of view of resistive magnetohydrodynamic (MHD) theory. Magnetized plasmas relax when they seek their natural state of lowest energy subject to certain topological constraints imposed by the magnetic field. Relaxation may be fast and dynamic or slow and gradual depending on the external environment in which the magnetoplasma system evolves. Relaxation occurs throughout the universe and may describe such diverse phenomena as dynamos, solar flares, and the operation of magnetic fusion energy experiments. This book concentrates on the dynamic, rather than variational aspects of relaxation. While the processes described are general, the book focuses on the reversed-field pinch experiment as a paradigm for plasma relaxation and dynamo action. Examples from other branches of plasma physics are also discussed. The authors draw upon their extensive experience in numerical and experimental studies of relaxation.

Lectures in Magnetohydrodynamics

2009-08-11 Science
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Release : 2009-08-11
Genre : Science
Kind : eBook
Book Rating : 884/5 ( reviews)

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Book Synopsis Lectures in Magnetohydrodynamics by : Dalton D. Schnack

Download or read book Lectures in Magnetohydrodynamics written by Dalton D. Schnack. This book was released on 2009-08-11. Available in PDF, EPUB and Kindle. Book excerpt: Magnetohydrodynamics, or MHD, is a theoretical way of describing the statics and dynamics of electrically conducting uids. The most important of these uids occurring in both nature and the laboratory are ionized gases, called plasmas. These have the simultaneous properties of conducting electricity and being electrically charge neutral on almost all length scales. The study of these gases is called plasma physics. MHD is the poor cousin of plasma physics. It is the simplest theory of plasma dynamics. In most introductory courses, it is usually afforded a short chapter or lecture at most: Alfven ́ waves, the kink mode, and that is it. (Now, on to Landau damping!) In advanced plasma courses, such as those dealing with waves or kinetic theory, it is given an even more cursory treatment, a brief mention on the way to things more profound and interesting. (It is just MHD! Besides, real plasma phy- cists do kinetic theory!) Nonetheless, MHD is an indispensable tool in all applications of plasma physics.

Lectures in Plasma Physics

1987 Magnetohydrodynamics
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Release : 1987
Genre : Magnetohydrodynamics
Kind : eBook
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Book Synopsis Lectures in Plasma Physics by : Claude Mercier

Download or read book Lectures in Plasma Physics written by Claude Mercier. This book was released on 1987. Available in PDF, EPUB and Kindle. Book excerpt:

Extended Magnetohydrodynamic Modeling of Plasma Relaxation Dynamics in the Reversed-field Pinch

2015
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Release : 2015
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Book Synopsis Extended Magnetohydrodynamic Modeling of Plasma Relaxation Dynamics in the Reversed-field Pinch by :

Download or read book Extended Magnetohydrodynamic Modeling of Plasma Relaxation Dynamics in the Reversed-field Pinch written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear plasma relaxation dynamics in reversed-field pinch (RFP) conditions are investigated using extended magnetohydrodynamic modeling with the NIMROD code [Sovinec et. al. JCP 195 (2004)]. The computations display quasi-periodic relaxation events, consistent with the RFP sawtooth cycle. The first event occurs from a saturated single-helicity state and is not representative of the multi-helicity conditions in typical RFP discharges. The MHD and Hall dynamo electric fields cooperate during the initial relaxation, and the change in the plasma flow parallel to the magnetic field is in the direction of the Lorentz force density and opposite to the change in parallel current density. In subsequent events, the MHD dynamo relaxes the parallel current and is opposed by the Hall dynamo, which is smaller in magnitude. The associated Lorentz force density drives changes in flow that are in the same direction as the change in current, in agreement with experimental observations [Kuritsyn et. al. POP 055903 (2009)]. Changes in total momentum are due to viscous coupling to the wall; radial transport occurs through Maxwell stresses associated with current relaxation. The magnetic and hybrid helicity are well conserved relative to magnetic energy over the relaxation events. The helicities change by

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