Microturbulence reduction during negative central shear tokamak discharges

C. L. Rettig, W. A. Peebles, E. J. Doyle, K. H. Burrell, C. Greenfield, G. M. Staebler, B. W. Rice

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13 Scopus citations

Abstract

Increased temperature, confinement, and fusion reactivity recently achieved during discharges in the DIII-D Totamak [J. Luxon et al., Plasma Physics and Controlled Nuclear Fusion Research, 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1. p. 159] with negative central magnetic shear (NCS) are accompanied by reduced core electrostatic microturbulence. Comparison of fluctuation characteristics between discharges with and without NCS reveals significant differences in the level and location of microturbulence. While the cause, or instability, for die microturbulence is not known, the reduction of the saturated level is consistent with models incorporating negative shear stabilization and turbulence stabilization by sheared ExB flow.

Original languageEnglish
Pages (from-to)4009-4016
Number of pages8
JournalPhysics of Plasmas
Volume4
Issue number11
DOIs
StatePublished - Nov 1997
Externally publishedYes

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