Patent ID: 9091944
Filing Date: 2015-07-28
Classification: G03F,H05G

Abstract:
1. A source collector apparatus for an extreme ultraviolet radiation lithographic apparatus wherein the extreme ultraviolet radiation is generated by exciting a fuel to provide a plasma emitting the radiation, the source collector apparatus comprising: an enclosing structure constructed and arranged to define a closed loop flow path for a buffer gas in the enclosing structure; a pump constructed and arranged to force the buffer gas through the closed loop flow path; and a gas decomposer constructed and arranged to decompose a compound of fuel material and buffer gas material, and to feed back into the closed loop flow path at least a portion of said buffer gas material, wherein the gas decomposer comprises a pipe surrounding at least one insert, and wherein a characteristic length between a surface of the insert and a surface of the pipe at a cross-section of the decomposer is equal to a diffusion length of the compound of fuel material.