Patent ID: 8324600

Claim:
An apparatus for measuring and controlling a target trajectory within a chamber apparatus for generating extreme ultraviolet light from plasma generated by irradiating a droplet target supplied from a target injection nozzle with a driver laser beam from an external driver laser, said apparatus comprising: a nozzle adjustment mechanism for adjusting a position and particular angles of said target injection nozzle, wherein said nozzle adjustment mechanism is configured to adjust a first angle of said target injection nozzle around a first rotational axis and to adjust a second angle of said target injection nozzle around a second rotational axis orthogonal to the first rotational axis; a target trajectory measuring unit for measuring a target trajectory formed by a droplet target supplied from said target injection nozzle to obtain trajectory information on the target trajectory; a target trajectory angle detecting unit for obtaining an angle deviation between the target trajectory represented by the trajectory information obtained by said target trajectory measuring unit and a predetermined target trajectory; and a nozzle adjustment controller for controlling said nozzle adjustment mechanism based on the angle deviation obtained by said target trajectory angle detecting unit such that the droplet target supplied from said target injection nozzle passes through a predetermined position.