A method for ionization of a fluid

A method for ionization of a fluid, wherein the fluid is conveyed inside of an elongated container in a gaseous state, wherein an inner surface of a wall of the elongated fluid container has a circular shape in a cross section transverse to a longitudinal direction of the container, wherein an inner diameter of the container is in a range of 10-50 mm, wherein a first pair of electrodes are arranged in the container opposite each other and at a distance from each other in a transverse direction of the elongated container, wherein the method comprises the steps of supplying a voltage to each electrode in the first pair of electrodes in a range of 2 to 15 kV so that electric discharges take place from the electrodes for ionization of the fluid, supplying the fluid with a flow rate in a range of 5-80 litre/min to an inlet of the container for deflecting at least a part of the electric discharges downstream in a fluid flow direction and providing a magnetic field in the vicinity of the first pair of electrodes for affecting a structure of the discharges for supporting the ionization of the fluid.