Patent ID: 7718980
Filing Date: 2010-05-18
Classification: H01J

Abstract:
1. A beam processing system for causing a particle beam extracted from a beam generating source to pass through a mass analysis magnet device, a mass analysis slit, and a deflection scanner in the order named, thereby irradiating the particle beam onto a processing object, wherein said mass analysis slit is installed between said mass analysis magnet device and said deflection scanner at a position where the particle beam having passed through said mass analysis magnet device converges most in a lateral direction, and a first vertically focusing DC quadrupole electromagnet and a second vertically focusing DC quadrupole electromagnet are installed on an upstream side and a downstream side of said mass analysis slit, respectively, the vertically focusing being for converging the particle beam in a longitudinal direction, wherein said first DC guadrupole electromagnet is installed in the vicinity of upstream of said mass analysis slit, and said second DC guadrupole electromagnet is installed in the vicinity of upstream of said deflection scanner, wherein the particle beam having passed through said mass analysis magnet device is caused to forcibly converge in the longitudinal direction for the first step and to diverge in the lateral direction by said first DC guadrupole electromagnet in the vicinity of upstream of said mass analysis slit, and the particle beam having passed through said mass analysis slit is caused to forcibly converge in the longitudinal direction for the second step and to diverge in the lateral direction by said second DC guadrupole electromagnet in the vicinity of upstream of said deflection scanner, thereby forming the beam strongly double-steps converging in the longitudinal direction, and wherein said mass analysis slit is installed at the position where the particle beam having a beam section of an elliptical, circular, or oval shape and having passed through said mass analysis magnet device converges most in the lateral direction.