Patent ID: 8492738

Claim:
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 is disposed in a direction opposite to a laser light incidence direction to collect the EUV light and has an ion-collecting hole for the ions 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 or in the vicinity of the EUV light production point; and ion withdrawal means that is disposed on the opposite side of the EUV light production point across the ion-collecting hole of the collector mirror and on the side facing the EUV light production point, and withdraws the ions, an entrance of the ion withdrawal means being open to the ion-collecting hole.