The role of the neutral-beam fuelling profile in determining the store
d energy and neutron emission in neutral-beam-heated discharges on TFT
R is investigated. It is found that the neutral-beam fuelling profile
is sensitive to both the magnitude and the shape of the electron densi
ty. The ion stored energy correlates well with the peaking of the neut
ral-beam fuelling profile, whereas the electron stored energy is insen
sitive to this parameter. The DD fusion neutron emission is also well
correlated with the peaking of the neutral-beam fuelling profile. The
derived empirical scalings of the ion stored energy and neutron yield
include discharges from the L mode to the supershot regime.