D.V. Bartlett

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 scaling of the energy confinement in H mode plasmas with different hydrogenic isotopes (hydrogen, deuterium, DT and tritium) is investigated in JET.

TL;DR: Experiments in the JET tokamak with additional heating power above 5 MW show that the plasma can undergo a transition to a new regime and an improvement in the glogal energy confinement time of up to 20% is observed.

TL;DR: In this article, the position of rational surfaces associated with the safety factor q was determined from the analysis of MHD activity in pellet enhanced performance (PEP) pulses, and a transport simulation showed that the bootstrap current is driven by the steep density gradient, which results from improved confinement in the plasma core where the shear is negative.

TL;DR: In this article, a series of dedicated experiments were carried out on JET in tritium, DT, deuterium and hydrogen plasmas to determine the dependence of the H mode power threshold on the plasma isotopic mass.