Inductive effects during second harmonic current drive experiments on T-10

Conference · Sat Oct 15 04:00:00 EDT 1994 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:7014125

Forest, C B; Harvey, R W; Lohr, J; Luce, T C; Lin-Liu, Y R ^[1]; Esipchuk, Y; Notkin, G; Razumova, K ^[2]

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1. General Atomics, San Diego, California 92186-9784 (United States)
2. Russian Scientific Center, Kurchatov Institute, Moscow (Russian Federation)

Current drive during second harmonic, electron cyclotron heating experiments performed on the T-10 tokamak have been simulated with the ONETWO transport code to determine the effects of induction on the time evolution of the loop voltage and current density profile. Ray tracing shows the well focused rf power can generate centrally peaked current densities which exceed the Ohmic current densities by a factor of five, causing very peaked current profiles which will be unstable to sawteeth. A Kadomtsev model of the sawtooth shows that a limit cycle is quickly reached which maintains a broad current profile and requires generation of a negative dc component of the loop voltage localized near the magnetic axis. This negative electric field effectively reduces the measured current drive efficiency. A broader profile of driven current, as in the fundamental current drive experiment on T-10, would not suffer this effect.

• DOE Contract Number: AC03-89ER51114
• OSTI ID: 7014125
• Report Number(s): CONF-9304112--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 289:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
CLOSED PLASMA DEVICES
COMPUTER CODES
CURRENT DENSITY
CYCLOTRON HARMONICS
ECR HEATING
HARMONICS
HEATING
HIGH-FREQUENCY HEATING
OSCILLATIONS
PLASMA HEATING
SAWTOOTH OSCILLATIONS
T-10 TOKAMAK
THERMONUCLEAR DEVICES
TOKAMAK DEVICES