  It is proposed to produce highly charged ions in the local potential traps
formed by the rippled electron beam in a focusing magnetic field. In this
method, the extremely high electron current densities can be attained on short
length of the ion trap. The design the very compact ion sources is feasible.
For such ions as, for example, Ne${}^{8+}$ and Xe${}^{44+}$, the intensities of
about $10^9$ and $10^6$ particles per second, respectively, can be obtained.
