Sawtooth stabilization by localized electron cyclotron heating in a tokamak plasma

Technical Report · Thu Nov 01 04:00:00 EST 1990

DOI:https://doi.org/10.2172/6276375· OSTI ID:6276375

Hanada, K; Tanaka, H; Iida, M; Minami, T; Maekawa, T; Terumichi, Y; Tanaka, S ^[1]; Ide, S ^[2]; Nakamura, M ^[3]; Yamada, M; Manickam, J; White, R B ^[4]

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1. Kyoto Univ. (Japan). Dept. of Physics
2. Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment
3. Osaka Inst. of Tech. (Japan)
4. Princeton Univ., NJ (USA). Plasma Physics Lab.

Sawtooth oscillations (STO) in the ohmically heated WT-3 tokamak are strongly modified or suppressed by localized electron cyclotron resonance heating (ECH) near the q = 1 surface, where q refers to the safety factor. The effect of ECH is much stronger when it is applied on the high field side (the inner side of the tokamak) as compared to the low field side (outer side). Complete suppression of the STO is achieved for the duration of the ECH when it is applied on the high field side, in a low density plasma, provided the ECH power exceeds a thresholds 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 q = region. 14 refs., 5 figs.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6276375
• Report Number(s): PPPL-2725; ON: DE91004677
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
CLOSED PLASMA DEVICES
ECR HEATING
HEATING
HIGH-FREQUENCY HEATING
OSCILLATIONS
PLASMA HEATING
SAWTOOTH OSCILLATIONS
SHEAR
STABILITY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
WT-3 TOKAMAK