Suppression of disruptions with ECH on JFT-2M
Conference
·
· AIP Conference Proceedings (American Institute of Physics); (United States)
OSTI ID:6929566
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- Dept. of Fusion Plasma Research, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11 (Japan)
Typical MHD disruptions at surface safety factor q[sub a]=3 have been avoided by off-central ECH in the JFT-2M Tokamak. For the suppression, the electron cyclotron resonance layer has to be placed radially in a very narrow region of width about 1 cm near the q=2 surface. Both low-field side heating and high-field side heating are effective for the suppression. Fourier spectrum of the magnetic fluctuation shows that mode amplitude decreases by ECH and disruption is avoided. Without ECH, the mode frequency decreases (mode locking) and disruption occurs. Pulse feedback modulation of the ECH power by a magnetic pickup signal shows that the effect of the ECH to reduce the fluctuation is observed only when O-point of the island is likely to be heated. The actual time scale of the suppression is much faster than the time scale of the change of the overall current profile. These observations show that ECH acts on the m=2 island. Further this heating is found to be effective to reduce the m=2 mode which appears at the density-limit-disruption.
- OSTI ID:
- 6929566
- 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
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
CLOSED PLASMA DEVICES
ECR HEATING
ELECTROMAGNETIC RADIATION
FLUCTUATIONS
HEATING
HIGH-FREQUENCY HEATING
JFT-2M TOKAMAK
MAGNETIC FIELDS
PLASMA DENSITY
PLASMA HEATING
RADIATIONS
RADIOWAVE RADIATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
CLOSED PLASMA DEVICES
ECR HEATING
ELECTROMAGNETIC RADIATION
FLUCTUATIONS
HEATING
HIGH-FREQUENCY HEATING
JFT-2M TOKAMAK
MAGNETIC FIELDS
PLASMA DENSITY
PLASMA HEATING
RADIATIONS
RADIOWAVE RADIATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS