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In a recent paper (Phys. Plasmas 25, 061203, 2018), the authors havepresented the analysis of the electric ion drift velocity experienced by heavyions created in a plasma submitted to a low magnetic field. Unfortunately, theyhave used the classical ExB drift formula that is valid only in slab geometry.The authors have not taken into account that the cylindrical geometry induces aslow electric drift of the ions around the axis of the column. Moreover, thelow magnetization of the ions induces a Larmor radius that is larger than thediameter of the plasma column. The movement of the ions immediately after theircreation is parallel to the local electric field, not perpendicular asindicated by the authors. Most often the ions are neutralized beforeexperiencing the electric drift calculated along the classical guiding centertheory. This has not been taken into account carefully by the authors so thatthe theoretical analysis of the Laser Induced Fluorescence measurementspresented in this paper is clearly invalid.

Comment on "Ion velocity analysis of rotating structures in a magnetic linear plasma device" [Phys. Plasmas 25, 061203 (2018)]