  Two-dimensional fully kinetic particle-in-cell simulations of an
electrodeless plasma thruster using a magnetic nozzle are conducted to
investigate the thrust generation induced by the internal plasma current, where
a bi-directional thruster configuration is considered to reduce the calculation
cost. The results clearly show that the E $\times$ B and diamagnetic current
densities are the major components of the internal current. The simulated
pressure structures well reproduce the experimentally observed ones. The
results for various magnetic field strengths reveal that the E $\times$ B
effect decreases and the diamagnetic one becomes dominant with an increase in
the magnetic field strength, respectively, demonstrating the significant
contribution of the diamagnetic effect on the thrust generation.
