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The declared aim of Marvel Fusion is the realization of a reactor based onthe aneutronic fusion of proton and boron-11 nuclei in the near future, makinguse of latest-day laser technology and nano-structured materials. The aim ofthe preprint quoted above is to demonstrate the feasibility of fusion energygain from the irradiation of an initially uncompressed target consisting of anarray of nano-wires, by a femto-second laser. This proposal is in apparentcontrast to text-book wisdom, which postulates - even for the fast-ignitorconcept, and a DT fuel mix - a target density about 1000 times that of solidstate. The novel, optimistic predictions of Ruhl and Korn are based, however,not on rigorous estimates, but only on parametric dependencies, extrapolatedfar beyond their conventional limits of validity. The authors invoke theeffects of self-arising magnetic fields to result in additional magneticconfinement, but we show their model to contain intrinsic contradictions. Theconclusion from out note is that ultra-fast, high power lasers can be of use toinertial fusion energy production only, if the intrinsic time-scale for fusionreactions can be brought down to a level more commensurate with the Laser pulselength. Involving magnetic fields does not change this basic limitation, as theAlfv\'en time will be similar to the kinetic disintegration time. Given thatthe fusion energy gain as function of particle energy has a maximum (for DT atabout 170 keV) overheating will not be helpful so that the required enhancementof the fusion reaction rate can only be achieved by strong pre-compression ofthe target.

Comments to "A non-thermal laser-driven mixed fuel nuclear fusion reactor concept" by H. Ruhl and G. Korn (Marvel Fusion, Munich)