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Author : Ohjin J. Kwon
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (88 download)
Download or read book Stability Analysis of High Beta Plasmas in JET written by Ohjin J. Kwon and published by . This book was released on 2011* with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Benjamin M. Ma
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (986 download)
Download or read book Stability Analysis for Resistive Interchange Instability of High Beta Plasma written by Benjamin M. Ma and published by . This book was released on 1986 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G. T. A. Huysmans
Publisher :
ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (476 download)
Download or read book MHD stability analysis of high-#beta# JET discharges written by G. T. A. Huysmans and published by . This book was released on 1990 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G.T.A. Huysmans
Publisher :
ISBN 13 :
Total Pages : 51 pages
Book Rating : 4.:/5 (878 download)
Download or read book High-beta Stability Studies of Jet Discharges with the Numerical Program HBT written by G.T.A. Huysmans and published by . This book was released on 1990 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (16 download)
Download or read book High Beta and Second Stability Region Transport and Stability Analysis. Final Report written by and published by . This book was released on 1992 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes ideal and resistive studies of high-beta plasmas and of the second stability region. Emphasis is focused on s̀̀upershot ̀̀plasmas in TFIR where MHD instabilities are frequently observed and which spoil their confinement properties. Substantial results are described from the analysis of these high beta poloidal plasmas. During these studies, initial pressure and safety factor profiles were obtained from the TRANSP code, which is used extensively to analyze experimental data. Resistive MBD stability studies of supershot equilibria show that finite pressure stabilization of tearing modes is very strong in these high?p plasmas. This has prompted a detailed re-examination of linear tearing mode theory in which we participated in collaboration with Columbia University and General Atomics. This finite pressure effect is shown to be highly sensitive to small scale details of the pressure profile. Even when an ad hoc method of removing this stabilizing mechanism is implemented, however, it is shown that there is only superficial agreement between resistive MBD stability computation and the experimental data. While the mode structures observed experimentally can be found computationally, there is no convincing correlation with the experimental observations when the computed results are compared with a large set of supershot data. We also describe both the ideal and resistive stability properties of TFIR equilibria near the transition to the second region. It is shown that the highest? plasmas, although stable to infinite-n ideal ballooning modes, can be unstable to the so called ì̀nfernal ̀̀modes associated with small shear. The sensitivity of these results to the assumed pressure and current density profiles is discussed. Finally, we describe results from two collaborative studies with PPPL. The first involves exploratory studies of the role of the 1/1 mode in tokamaks and, secondly, a study of sawtooth stabilization using ICRF.
Author : Shoichi Yoshikawa
Publisher :
ISBN 13 :
Total Pages : 23 pages
Book Rating : 4.:/5 (713 download)
Download or read book Shear-Ballooning Stability Analysis of Low-Beta Plasmas written by Shoichi Yoshikawa and published by . This book was released on 1981 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (893 download)
Download or read book High Beta and Second Stability Region Transport and Stability Analysis written by and published by . This book was released on 1992 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes ideal and resistive studies of high-beta plasmas and of the second stability region. Emphasis is focused on supershot'' plasmas in TFIR where MHD instabilities are frequently observed and which spoil their confinement properties. Substantial results are described from the analysis of these high beta poloidal plasmas. During these studies, initial pressure and safety factor profiles were obtained from the TRANSP code, which is used extensively to analyze experimental data. Resistive MBD stability studies of supershot equilibria show that finite pressure stabilization of tearing modes is very strong in these high [beta]p plasmas. This has prompted a detailed re-examination of linear tearing mode theory in which we participated in collaboration with Columbia University and General Atomics. This finite pressure effect is shown to be highly sensitive to small scale details of the pressure profile. Even when an ad hoc method of removing this stabilizing mechanism is implemented, however, it is shown that there is only superficial agreement between resistive MBD stability computation and the experimental data. While the mode structures observed experimentally can be found computationally, there is no convincing correlation with the experimental observations when the computed results are compared with a large set of supershot data. We also describe both the ideal and resistive stability properties of TFIR equilibria near the transition to the second region. It is shown that the highest [beta] plasmas, although stable to infinite-n ideal ballooning modes, can be unstable to the so called infernal'' modes associated with small shear. The sensitivity of these results to the assumed pressure and current density profiles is discussed. Finally, we describe results from two collaborative studies with PPPL. The first involves exploratory studies of the role of the 1/1 mode in tokamaks and, secondly, a study of sawtooth stabilization using ICRF.
Author : M. P. Gryaznevich
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (794 download)
Download or read book Determination of Plasma Stability Using Resonant Field Amplification in JET written by M. P. Gryaznevich and published by . This book was released on 2012* with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Resonant Field Amplification has been systematically measured on JET using active MHD spectroscopy to probe plasma stability at high and low beta and compared with theoretical predictions. At high beta, RFA has been used to identify the ideal no-wall beta limit in several advanced regimes: the hybrid regime, with low magnetic shear and q(0) close to 1, and high beta plasmas being developed for steady-state application, with low or reversed magnetic shear and 1.0
Author :
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ISBN 13 :
Total Pages : 380 pages
Book Rating : 4.X/5 (4 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
![Download Fluctuations in High [beta][sub P] Plasmas in DIII-D. PDF Online Free](https://books.google.com/books/content/images/frontcover/0q_DDAEACAAJ?fife=w200-h370)
Download or read book Fluctuations in High [beta][sub P] Plasmas in DIII-D. written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In our investigation of improved confinement in high poloidal beta ([beta][sub p] = 2 to 4) advanced tokamak experiments, coincident with q[sub 0] rising above 2, we observe the internal MHD activity to evolve from an m/n = 2/1 to a 3/1 structure consistent with the GATO code stability analysis. The plasma eventually evolves to a quiescent state at which time the stored energy increases, mostly as a result of improved particle confinement. The measured plasma pressure profiles during this time are also calculated to be stable to high-n ballooning modes consistent with operation of the core in the second stable regime. The sustained improvement in confinement is ultimately limited by our ability to control the toroidal current profile of which the bootstrap current contributes a large fraction (up to 80%).
Download or read book Stability Study of High. Beta. Flux Conserving Equilibria written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Flux Conserving Tokamak (FCT) model suggested that rapid heating would yield equilibria with high relative energy density (.beta. = 2p/B2) while nonetheless allowing control over q, the so-called safety factor for instability within the ideal magnetohydrodynamic (MHD) plasma model. In this study, we show that this is adequate to provide stability to .beta. values of 10%, if there is a conducting metal shell in the vicinity of the plasma.
Author :
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ISBN 13 :
Total Pages : 226 pages
Book Rating : 4.F/5 ( download)
Download or read book Energy written by and published by . This book was released on 1984 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 852 pages
Book Rating : 4.3/5 (129 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G. T. A. Huysmans
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (315 download)
Download or read book MHD Stability Analysis of High-B JET Discharges written by G. T. A. Huysmans and published by . This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.3/5 (91 download)
Download or read book Fusion Energy Update written by and published by . This book was released on 1979 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 700 pages
Book Rating : 4.0/5 ( download)
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shear-ballooning Stability Analysis of Low-. Beta. Plasmas written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A model of magnetic configurations that has both shear and variation of the field curvature along the magnetic field is constructed. The stability analysis of this system is performed by expanding the perturbation functions to phi0 which is constant along the field and phi1 which is sinusoidally varied along the field line. The shear term is retained in the form of differntial operations in zeta, the coordinate parallel to the pressure gradient. After several simplifications, the equation reduces itself to the fourth order differential equation. The eigenvalue of this equation is numerically obtained. The calculated critical .beta. plotted versus the well depth parameter, h, makes a smooth transition between h 0 (maximum average B) and h 0 (minimum average B). Using the same technique, the nondivergent solution to the localized shear mode (Suydam mode) is also obtained by retaining the inertia term.
