Patent ID: 7482740
Filing Date: 2009-01-27
Classification: H05G

Abstract:
1. An electrode unit of an extreme ultraviolet radiation generator comprising: a breakdown voltage impression electrode; a ground electrode; an insulator provided in contact with the breakdown voltage impression electrode and the ground electrode in which plasma is generated between the electrodes thereby emitting extreme ultraviolet radiation from the generated plasma, wherein at least one of the breakdown voltage impression electrode and the ground electrode includes a cooling portion which is made of copper, aluminum, or a material which contains copper, aluminum, or combination thereof as a main component and in which a passage through which a coolant passes is formed, and a discharge portion which is provided in close contact with a surface of the cooling portion, and which is made of any one of tungsten, tantalum, rhenium, molybdenum, and an alloy thereof as the a main component.