Patent ID: 7423276

Claim:
An irradiation system with an ion beam/charged particle beam which is configured that the beam subjected to a mass analysis using a mass analysis magnet device and transformed by a beam transformer to an elliptical or oval cross-section that is long in one direction, is subjected to an energy analysis by an energy filter, and then is incident on an irradiation target, wherein said energy filter comprises a deflection magnet which comprises a general window-frame shaped core, main electromagnet coils and cancel correction coils, said frame-shape core including an upper yoke, a lower yoke and side yokes connected between said upper yoke and said lower yoke to form a hollow portion, said main electromagnet coils wound on said upper and said lower yokes to be perpendicular to a longitudinal direction of said upper and said lower yokes with passing through the hollow portion and to form a magnetic-filed in the hollow portion, said cancel correction coils wound on said side yokes to be perpendicular to the longitudinal direction of said upper and said lower yokes without passing through the hollow portion and to cancel leakage magnetic-filed.