Patent ID: 8368305

Claim:
An electrode device for gas discharge sources at least comprising: an electrode wheel rotatable in a rotational direction around a rotational axis, said electrode wheel having an outer circumferential surface between two side surfaces, and an electrode wheel cover covering a portion of said outer circumferential surface and said side surfaces, said cover being configured to form a cooling channel in a circumferential direction between said cover, said outer circumferential surface and a radially outer part of said side surfaces, said cooling channel comprising an inlet and an outlet opening in said cover allowing a flow of liquid material through the cooling channel for cooling the electrode wheel by the liquid material, and either to form a gap between said cover and said outer circumferential surface in extension of said cooling channel in the circumferential direction, said gap having a smaller flow cross section than said cooling channel and limiting a thickness of a film of said liquid material formed on said outer circumferential surface during rotation of the electrode wheel or to inhibit the formation of such a film in extension of said cooling channel in the circumferential direction from the liquid material flowing through the cooling channel.