Microturbulence reduction during negative central shear tokamak discharges

Journal Article · Sat Nov 01 04:00:00 EST 1997 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.872520· OSTI ID:544856

Rettig, C L; Peebles, W A; Doyle, E J ^[1]; Burrell, K H; Greenfield, C; Staebler, G M ^[2]; Rice, B W ^[3]

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1. Department of Electrical Engineering, University of California, Los Angeles, Los Angeles, California 90024 (United States)
2. General Atomics, P.O. Box 85608, San Diego, California 92186 (United States)
3. Lawrence Livermore National Laboratory, University of California, Livermore, California 94550 (United States)

Increased temperature, confinement, and fusion reactivity recently achieved during discharges in the DIII-D Tokamak [J. Luxon {ital 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 the microturbulence is not known, the reduction of the saturated level is consistent with models incorporating negative shear stabilization and turbulence stabilization by sheared E{times}B flow. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 544856
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 4; ISSN 1070-664X; ISSN PHPAEN
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA INSTABILITY
SHEAR
STABILIZATION
TOKAMAK DEVICES
TURBULENCE