Abstract
It is noted that the evaluation of the mean free path of ions by Park et al. [HEDP 8 (2012), 38–45] is incomplete without taking into account ion–electron collisions for colliding streams of high-speed laser-produced plasmas. As a result, the calculated scale of their interaction, ∼few mm, can be explained by Coulomb collisions rather than as claimed in the paper, by the formation of a laboratory collisionless shock that simulates astrophysical shocks mediated by a Weibel-like instability. Advantages of CO2-laser's irradiation and plane targets for such kind of experiments are discussed.
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