Patent ID: 7622727

Claim:
Extreme UV radiation source device, comprising: a vessel; a pair of disk-shaped discharge electrodes which are located in said vessel spaced apart at a distance from one another; a fuel supply means for supplying liquid or solid extreme UV radiation emitting fuel to at least one of the discharge electrodes; a discharge electrode rotation arrangement for rotating said at least one of the discharge electrodes to which the fuel is supplied; a vaporization means for vaporizing the fuel supplied to said at least one of the discharge electrodes; a power supply means for supplying power between the pair of electrodes; and collector optics for focusing the EUV radiation emitted from the high density and high temperature plasma produced from the vaporized fuel being heated and excited by a discharge which forms between the electrodes; wherein an aperture component with an opening is provided in the vessel between the electrodes and the collector optics, the aperture component dividing the vessel into a region provided with electrodes and a region provided with collector optics, wherein a device for cooling the aperture component is provided and at least the region provided with the electrodes is provided with a pumping means in the vessel.