Comment on 'lasertron: A proposed source of powerful nuclear-time-scale electromagnetic bursts'

In a recent paper (1) Kaplan and Shkolnikov propose to generate intense ultrashort pulses of electromagnetic radiation in the range(approx) 10(sup -21)s (zeptosecond) and large magnetic fields by using a petawatt electron laser irradiating a small solid particle or a piece of wire of a submicron size. In this comment we would like to point out that the method proposed in Ref.(1) will not achieve the desired results