Patent ID: 8288743
Filing Date: 2012-10-16
Classification: G03F,G21K,H05G

Abstract:
1. An ion withdrawal apparatus that withdraws ions emitted from a plasma in an EUV light production apparatus in which a target at an EUV light production point is irradiated with laser light to make a plasma state and the target emits EUV light, the ion withdrawal apparatus comprising: a collector mirror that collects the EUV light and has a first hole for the ions to pass therethrough and a second hole for the laser light to pass therethrough; first magnetic line of force production means that produces a magnetic line of force that is parallel or approximately parallel to the laser light incidence direction at the second hole; and ion withdrawal means that is disposed on the opposite side of the collector mirror from the EUV light production point and withdraws the ions via the first hole, wherein said first hole and said second hole are disposed to coincide or approximately coincide with a central axis of the collector mirror.