  Lately the question has been raised if a modification of the
energy-confinement scaling law with respect to the electron to ion temperature
ratio, Te/Ti, is required. Theoretically, like in e.g. the Weiland model, the
confinement is thought to degrade with Te/Ti and studies of the hot-ion
(Ti>/Te) mode seems to corroborate this. In this paper, it is shown that due to
a number of effects that cancel each other out, the energy confinement time
remains constant for Te/Ti>~1. The numerical study relies on a series of JET
shots specifically designed to reveal an effect of Te/Ti in the hot-electron
(Te>Ti) mode. A distinct effort was made to keep all current scaling-law
parameters constant, including the total heating power. The effects that
provide the constant confinement times have therefore nothing to do with the
global properties of the plasma, but are rather due to variations in the
temperature gradients which affects the transport locally.
