Comment on “Three-dimensional numerical investigation of electron transport with rotating spoke in a cylindrical anode layer Hall plasma accelerator” [Phys. Plasmas 19, 073519 (2012)]

The oscillation behavior described by Tang et al. [Phys. Plasmas 19, 073519 (2012)] differs too greatly from previous experimental and numerical studies to claim observation of the same phenomenon. Most significantly, the rotation velocity by Tang et al. [Phys. Plasmas 19, 073519 (2012)] is three orders of magnitude larger than that of typical “rotating spoke” phenomena. Several physical and numerical considerations are presented to more accurately understand the numerical results of Tang et al. [Phys. Plasmas 19, 073519 (2012)] in light of previous studies.

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