Plasma Physics (physics.plasm-ph)
Tue, 22 Aug 2023
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1.Comment on "Modification of Lie's transform perturbation theory for charged particle motion in a magnetic field''
Authors:Alain J. Brizard
Abstract: A recent paper by L.~Zheng [Phys. Plasmas, 30, 042515 (2023)] presented a critical analysis of standard Lie-transform perturbation theory and suggested that its application to the problem of charged-particle motion in a magnetic field suffered from ordering inconsistencies. In the present Comment, we suggest that this criticism is unjustified and that standard Lie-transform perturbation theory does not need to be modified in its application to guiding-center theory.