The invention relates to a special plasma source designated as a plasma intractor (PI) for producing a cold, homogeneous plasma under atmospheric pressure conditions, which plasma source can be used advantageously to excite and control reactive processes in flowing media. The device according to the invention is characterized in that the device comprises at least 6 elongated electrodes (2) and a molded body (1) made of insulating material, the molded body (1) being provided with an elongated cylindrical cavity (7) and with additional holes, which are guided parallel to the cavity (7) and arranged symmetrical to the axis of the cavity and equidistant to one another, and the electrodes (2) are embedded in holes of the molded body (1) and are connected to an AC high-voltage supply in such a way that the polarities of respective adjacent electrodes are opposite in each phase of the voltage period.