The characteristics of the magnetized plasma obtained in a modified double‐plasma device are presented. Primary ionizing electrons are produced by filament discharges in multipole devices located on either end of a magnetized plasma column. A very uniform magnetized plasma is produced in the column with a relatively small number of filaments by using coils to counterbalance the fringing field near the filaments. The obtained plasma is well suited for a large variety of wave experiments. The noise is maintained at a low level and the afterglow measurements reveal a very efficient confinement of the ionizing electrons, with a decay time of 0.2 ms.