Patent ID: 8212228

Claim:
An extreme ultra violet light source apparatus for generating extreme ultra violet light from plasma by irradiating a target with a laser beam generated by a driver laser, said apparatus comprising: a chamber installed in a clean room and in which extreme ultra violet light is generated; a collector mirror provided within said chamber, for collecting the extreme ultra violet light radiated from the plasma; a reactive gas supply unit for supplying a reactive gas to a space communicated with said chamber; a magnetic field generating device including a coil for generating a magnetic field in said chamber; an exhaust path connected to said chamber; a first exhausting unit provided in said exhaust path; and a collecting unit connected to an exhaust side of said first exhausting unit, for collecting a reaction product gas produced by reaction of debris and the reactive gas, said collecting unit including a diluting unit for diluting the reaction product gas, a second exhausting unit for sending the diluted reaction product gas, and a removing unit for collecting the reaction product gas, at least a part of said collecting unit being installed out of said clean room.