  Curvature-driven turbulence in a helical open-field-line plasma is
investigated using electrostatic five-dimensional gyrokinetic continuum
simulations in an all-bad-curvature helical-slab geometry. Parameters for a
National Spherical Torus Experiment scrape-off-layer plasma are used in the
model. The formation and convective radial transport of plasma blobs is
observed, and it is shown that the radial particle-transport levels are several
times higher than diffusive Bohm-transport estimates. By reducing the strength
of the poloidal magnetic field, the profile of the heat flux to the divertor
plate is observed to broaden.
