In this paper, the effects of macroparticle weighting on the plasma discharge, particularly near the centerline, are investigated using a two-dimensional axisymmetric particle-in-cell Monte Carlo collision (PIC/MCC) model. A variable macroparticle weight according to the radial position of the macroparticles is employed to maintain sufficient number of macroparticles near the centerline of the plasma source. The plasma density obtained from the PIC/MCC simulations for low-pressure (25-100 mTorr) capacitively coupled plasmas (CCPs) is found to be artificially large when the macroparticle weight near the centerline is not well resolved, demonstrating the need for particle convergence studies for axisymmetric PIC/MCC simulations.
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