  We have theoretically investigated the transport properties of a ring-shaped
array of small tunnel junctions, which is weakly coupled to the drain
electrode. We have found that the long range interaction together with the
semi-isolation of the array bring about the formation of stable standing
configurations of electrons. The stable configurations break up during each
transition from odd to even number of trapped electrons, leading to multiple
Coulomb blockade gaps in the the $I-V$ characteristics of the system.
