Each mobile router in a mobile ad hoc network is configured for measuring a minimum interval of stable relative proximity between at least one neighbor before initiating convergence of a routing protocol. The end face of the calking die has a peripheral recess, which extends from a diameter defining a radially inner remaining end face to a radially outer circumferential face of the calking die and which is intended for at least partially receiving the calked bead. A charged particle beam produced by a suitable source passes through a CPB-optical system so as to irradiate the surface of the specimen.