We adopted a test particle model subjected to the E x B drift, also known as the drift wave model, to explore the anomalous particle transport phenomenon observed at the plasma edge in tokamaks. The model incorporates an infinite number of drift waves, we can apply a Hamiltonian approximation to derive a nonlinear area-preserving map. Our analysis focuses on the influence of drift waves, examining their spatial modes and the phase differences between them. This approach allows us to understand how the perturbative waves contribute to plasma transport and affect particle confinement.

In this presentation, we will also discuss how modifying plasma profiles can reduce transport, thus enhancing particle confinement in plasma experiments. We will evaluate the impact of different electric and magnetic field profiles on transport behavior. Our results show that nonmonotonic electric and magnetic fields can create shearless transport barriers, which are particularly robust against perturbations, leading to a significant reduction in the transport coefficient.