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in subjects: "Minimum-B Configurations"  
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Minimum-B mirrors plus EBT principles

Description: Electrons are heated at the minimum-B location(s) created by the multiple field and the toroidal field. Resulting hot electrons can assist plasma confinement by (i) providing mirror, (ii) creating azimuthally symmetric toroidal confinement, or (iii) creating a modified bumpy torus.
Date: August 1, 1983
Creator: Yoshikawa, S.
Partner: UNT Libraries Government Documents Department
open access

The spheromak as a prototype for ultra-high-field superconducting magnets

Description: In view of current progress in the development of superconductor materials, the ultimate high-field limit of superconducting magnets is likely to be set by mechanical stress problems. Maximum field strength should be attainable by means of approximately force-free magnet windings having favorable ''MHD'' stability properties (so that small winding errors will not grow). Since a low-beta finite-flux-hole spheromak configuration qualifies as a suitable prototype, the theoretical and experimental … more
Date: August 1, 1987
Creator: Furth, H. P. & Jardin, S. C.
Partner: UNT Libraries Government Documents Department
open access

Physics of Substorm Growth Phase, Onset, and Dipolarization

Description: A new scenario of substorm growth phase, onset, and depolarization during expansion phase and the corresponding physical processes are presented. During the growth phase, as a result of enhanced plasma convection, the plasma pressure and its gradient are continued to be enhanced over the quiet-time values in the plasma sheet. Toward the late growth phase, a strong cross-tail current sheet is formed in the near-Earth plasma sheet region, where a local magnetic well is formed, the plasma beta can… more
Date: October 22, 2003
Creator: Cheng, C. Z.
Partner: UNT Libraries Government Documents Department
open access

Diffusion and fluctuation measurements in the trapped electron and trapped ion regimes

Description: Experiments have been performed in the Wisconsin Levitated Octupole with a weak toroidal magnetic field added to the octupole field. When the ions were collisionless or collisional, the diffusion scaling observed in the absolute minimum-B regions indicated convective diffusion driven by mirror-trapped electrons. When the ions were collisionless, both a dissipative trapped ion mode and a collisionless trapped ion mode were observed in the average minimum-B region. These modes were distinguished … more
Date: January 1, 1976
Creator: Drake, J. R.; Kerst, D. W.; Navratil, G. A.; Post, R. S.; Ejima, S.; LaHaye, C. Moeller, Ohkawa, T. et al.
Partner: UNT Libraries Government Documents Department
open access

Fast Particle Destabilization of Toroidicity Induced Alfven Eigenmodes in National Spherical Torus Experiment

Description: Toroidicity induced Alfven Eigenmode (TAE) stability in National Spherical Torus Experiment (NSTX) is analyzed using the improved NOVA-K code, which includes finite orbit width and Larmor radius effects and is able to predicts the saturation amplitude for the mode using the quasilinear theory. Broad spectrum of unstable global TAEs with different toroidal mode numbers is predicted. Due to the strong poloidal field and the presence of the magnetic well in NSTX better particle confinement in the … more
Date: December 10, 1999
Creator: Cheng, C. Z.; Fu, G. Y.; Gorelenkova, M. V.; Gorelenkov, N. N.; White, R. & Kaye, S.
Partner: UNT Libraries Government Documents Department
open access

High Beta Tokamaks

Description: Perhaps the ideal tokamak would have high {beta} ({beta} {approx}> 1) and classical confinement. Such a tokamak has not been found, and we do not know if one does exist. We have searched for such a possibility, so far without success. In 1990, we obtained analytic equilibrium solutions for large aspect ratio tokamaks at {beta} {approx} {Omicron}(1) [1]. These solutions and the extension at high {beta} poloidal to finite aspect ratio [2] provided a basis for the study of high {beta} tokamaks.… more
Date: November 14, 1998
Creator: Cowley, S.
Partner: UNT Libraries Government Documents Department
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