2-D time evolution of T/sub e/ during sawtooth crash based on fast ECE (electron cyclotron emission) measurements on TFTR
Electron cyclotron emission measurements taken at 20 locations in the horizontal midplane during a sawtooth crash have been analysed based on the assumption of fast rigid rotation of the plasma. Due to this fast rotation (approx.100..mu..sec), which remains fairly constant throughout the sawtooth crash, we have been able to make time-to-space reconstructions of half the poloidal plane using points which are separated in time by not more than 40..mu..sec. The existence of a temperature flattening in the precursor phase, which we interpret as an m = 1 temperature island, is clearly demonstrated, and its location and width agree well with local emissivity measurements from soft x-ray tomography viewing the same poloidal plane. The rotating temperature island in the precursor phase, the outward movement of the region of high T/sub c/ during the crash phase, and the shape of T/sub e/ during the crash phase, and the shape of T/sub e/ distribution after the crash during the successor phase have all been documented in a time sequence of color contours. 4 refs., 10 figs.
- Research Organization:
- Princeton Univ., NJ (USA). Plasma Physics Lab.
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 6526244
- Report Number(s):
- PPPL-2556; ON: DE89006859
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700101 -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
COMPUTERIZED SIMULATION
CYCLOTRON RESONANCE
ELECTRON CYCLOTRON-RESONANCE
ELECTRON TEMPERATURE
INSTABILITY
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
RESONANCE
SIMULATION
TEMPERATURE DISTRIBUTION
TFTR TOKAMAK
THERMONUCLEAR REACTORS
TIME DEPENDENCE
TOKAMAK TYPE REACTORS