Sawtooth stabilization by localized electron cyclotron heating in a tokamak plasma

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.1974· OSTI ID:5459727

Hanada, K; Tanaka, H; Iida, M; Ide, S; Minami, T; Nakamura, M; Maekawa, T; Terumichi, Y; Tanaka, S ^[1]; Yamada, M; Manickam, J; White, R B ^[2]

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1. Department of Physics, Faculty of Science, Kyoto University, Kyoto, Japan (JP)
2. Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (USA)

Sawtooth oscillations (STO) in the Ohmically heated WT-3 tokamak are strongly modified or suppressed by localized-electron cyclotron resonance heating (ECH) near the {ital q}=1 surface, where {ital q} refers to the safety factor. The efect of ECH is much stronger when it is applied on the high-field side as compared to the low-field side. Complete suppression of the STO is achieved for the duration of the ECH, in most cases, when it is applied on the high-field side of a low-density plasma, provided the ECH power exceeds a threshold value. The STO stabilization is attributed to a modification of the current-density profile by hot electrons generated by ECH, which reduces the shear in the {ital q}=1 region.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 5459727
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:15; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107 -- Fusion Energy-- Plasma Research-- Instabilities
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
ANNULAR SPACE
CLOSED CONFIGURATIONS
CLOSED PLASMA DEVICES
CONFIGURATION
DATA
ECR HEATING
ELECTRIC HEATING
EXPERIMENTAL DATA
HEATING
HIGH-FREQUENCY HEATING
INFORMATION
INHIBITION
JOULE HEATING
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
MODIFICATIONS
NUMERICAL DATA
OSCILLATIONS
PLASMA
PLASMA HEATING
RESISTANCE HEATING
SAWTOOTH OSCILLATIONS
SPACE
STABILIZATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOROIDAL CONFIGURATION
TRAJECTORIES