F. C. Schüller

TL;DR: In this paper, the authors describe a two-stage MHD instability, where the first stage is caused by a loss of energy from the central region and the second stage is due to an increase in impurity radiation.

TL;DR: In this article, the authors discussed the apparent reasons for the mode locking in a particular location and a comparison with theory is made, as well as the possible precursors to most disruptions.

TL;DR: In this paper, it was shown that electron heat transport is governed by alternating layers of good and bad thermal conduction, and the formation of sharp off-axis maxima on the profile was attributed to heat deposition precisely 'on top of' a transport barrier.

TL;DR: In this article, an experimental study of the generation of runaway electrons in TEXTOR has been performed and it was concluded that the secondary generation, i.e. the creation of runaways through close collisions of already existing runaways with thermal electrons, provides an essential contribution to the runaway production.

TL;DR: A population of 30 MeV runaway electrons in the TEXTOR tokamak is diagnosed by their synchrotron emission and the fact that the beam survives the period of stochastic field shows that in the chaotic sea big magnetic islands must remain intact.