{bold E{times}B} flow shear and enhanced confinement in the Madison Symmetric Torus reversed-field pinch
- Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin53706 (United States)
Strong {bold E{times}B} flow shear occurs in the edge of three types of enhanced confinement discharge in the Madison Symmetric Torus [Dexter {ital et al.}, Fusion Technol. {bold 19}, 131 (1991)] reversed-field pinch. Measurements in standard (low confinement) discharges indicate that global magnetic fluctuations drive particle and energy transport in the plasma core, while electrostatic fluctuations drive particle transport in the plasma edge. This paper explores possible contributions of {bold E{times}B} flow shear to the reduction of both the magnetic and electrostatic fluctuations and, thus, the improved confinement. In one case, shear in the {bold E{times}B} flow occurs when the edge plasma is biased. Biased discharges exhibit changes in the edge electrostatic fluctuations and improved particle confinement. In two other cases, the flow shear emerges (1) when auxiliary current is driven in the edge and (2) spontaneously, following sawtooth crashes. Both edge electrostatic and global magnetic fluctuations are reduced in these discharges, and both particle and energy confinement improve. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 627780
- Report Number(s):
- CONF-971103-; ISSN 1070-664X; TRN: 98:006132
- Journal Information:
- Physics of Plasmas, Vol. 5, Issue 5; Conference: 39. annual meeting of the Division of Plasma Physics of the American Physical Society, Pittsburgh, PA (United States), 17-21 Nov 1997; Other Information: PBD: May 1998
- Country of Publication:
- United States
- Language:
- English
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