Patent ID: 8039820

Claim:
A device for connecting a first depressurization vessel to a second depressurization vessel, the device comprising: a communication hole comprising: a first opening which is connected to the first depressurization vessel, and a second opening which is connected to the second depressurization vessel, the first opening and the second opening being, respectively, at opposite ends of the communication hole such that extreme ultraviolet radiation passes in a radiation direction from the first opening to the second opening; a gas inlet through which a gas from a gas supply unit flows into the communication hole in a direction perpendicular to the radiation direction of the extreme ultraviolet radiation; and a first gas outlet which is opposed to the gas inlet such that the gas is exhausted from the gas outlet by a first gas exhaust unit; at least one second gas outlet provided on a side of the second depressurization vessel with respect to the first gas outlet such that the gas supplied through the gas inlet is exhausted by a second gas exhaust unit, wherein the second gas outlet is arranged not opposed to the gas inlet.