Perturbative experiments on TFTR have investigated the transport of multiple ion species in reverse shear (RS) plasmas. The profile evolutions of trace tritium and helium and intrinsic carbon indicate the formation of core particle transport barriers in enhanced reverse shear (ERS) plasmas. There is an order of magnitude reduction in the particle diffusivity inside the RS region. Thediffusivities for these species in ERS plasmas agree with neoclassical theory.
Characterization of particle confinement properties in RFX-mod at a high plasma current