A wind turbine blade includes a body having a first surface characteristic; and a sleeve, arranged on the body, having a second surface characteristic which is different from the first surface characteristic. The photoionization chamber includes a cathodic electrode and an anodic electrode which may be coated with a thin layer of material. A tool is provided having a plurality of teeth which are configured so that they can be inserted in the gap between the first and second tile sections. Each group of nozzle arrangements includes a pair of rows of nozzle arrangements. This arrangement automatically provides a reliable electrical connection down the wand.