Patent ID: 8569721

Claim:
An extreme ultra violet light source apparatus for generating extreme ultra violet light from plasma generated by irradiating a target material supplied to a region with a laser beam introduced from an external unit, said apparatus comprising: a chamber in which the plasma is generated; a target supply division for supplying the target material to the region within said chamber, including a nozzle for supplying a stream of the target material into said chamber, at least a part of said nozzle having an electric insulation property, and including a target tank for pressurizing the target material stored therein with a gas to supply the target material to said nozzle, a potential of said target tank being set to a ground potential; a charging electrode disposed between said nozzle and said region; a power supply and control unit for applying a voltage between said target tank and said charging electrode; a collector mirror for collecting extreme ultra violet light from the plasma to output the extreme ultra violet light; and a target collecting unit for collecting the target material.