Comment on “Results of precision particle simulations in an all-electric ring lattice using fourth-order Runge–Kutta integration”

I point out that some of the findings reported in the commented paper are restatements of facts well known to workers in the field and some of the analysis of the orbital motion pays insufficient attention to the decomposition of the radial motion into betatron and dispersion terms. Some of the numerical studies of the spin precession time also contain discernible systematic errors.