The observation of internal transport barriers (ITBs) in which ion thermal diffusivity is
reduced to a neoclassical level has been made for the first time in tokamak plasmas fueled
with deuterium and tritium ions using a broad current density profile. The heating and current
profiles required to obtain an ITB are similar in DT and DD plasmas. Central ion
temperatures of 40 keV and plasma pressure gradients of 10 6 Pa/m were observed in a DT
plasma, leading to a fusion triple product ni T i τ E= 1.10 21 m− 3 keV s and 8.2 MW of fusion …

The observation of Internal Transport Barriers (ITBs) in which ion thermal diffusivity is
reduced to its neo-classical level has been made for the first time in tokamak plasmas
fuelled with deuterium and tritium (DT) ions using a broad or hollow current density profile.
The heating and the current profile required to obtain an ITB are similar in DT and in DD
plasmas. Central ion temperatures close to 40keV, ion temperature gradients of 150keV/m
and plasma pressure gradients of 10 {sup 6} Pa/m were observed in DT leading to a fusion …