  In the full-orbit particle simulations of energetic particle transport in
plasmas, the plasma turbulence is typically described as a homogeneous
superposition of linear Fourier modes. The turbulence evolution is, however,
typically a nonlinear process, and, particularly in the heliospheric context,
the solar wind plasma is inhomogeneous due to the transient structures, as
observed by remote and in-situ measurements. In this work, we study the effects
of the inhomogeneities on energetic particle transport by using spatially
distributed, superposed turbulence envelopes. We find that the cross-field
transport is significantly reduced, when compared to the results obtained with
homogeneous turbulence. The reduction can reach an order of magnitude when the
enveloping breaks the wave phase coherence along the mean magnetic field
direction.
