Density turbulence and disruptive phenomena in TEXTOR
Disruptive processes in tokamaks can cause large forces to be exerted on vessel components and support structures. In the next generation of large tokamak machines, the sudden release of stored plasma energy presents a serious erosion problem at the first wall. The rapid loss of energy confinement has been investigated as part of a study of plasma disruption phenomena in TEXTOR. The evolution of the density fluctuation spectrum from the time of MHD precursors to the final energy quench is shown. Significant changes of the spectrum are observed at the onset of the T(e)-profile erosion. In the radial regime between the q = 1 and q = 2 surface, T(e) perturbations are detected by ECE measurements, and pronounced impurity emission is observed. Strong turbulent density fluctuations seem to be responsible for the loss of energy confinement. The turbulent density fluctuations are still observable in the current decay phase.
Bibliographic Reference: Article: Proceedings of the 19th Conference on Controlled Fusion and Plasma Physics, Vol. 1 (1992) pp. 359-362
Record Number: 199211309 / Last updated on: 1994-11-29
Original language: en
Available languages: en