Patent ID: 7541601
Filing Date: 2009-06-02
Classification: H01J

Abstract:
1. An ion beam irradiating apparatus which irradiates a target with an ion beam having a shape where a size in y direction in a plane intersecting with a traveling direction is larger than a size in x direction perpendicular to the y direction, said apparatus comprising: a beam profile monitor which measures a beam current density distribution in at least the y direction of the ion beam in a vicinity of a position of said target; a plurality of movable shielding plates which are arranged on at least one side in the x direction of an ion beam path on an upstream side of the position of said target, said movable shielding plates being mutually independently movable along the x direction, and blocking the ion beam; a shielding-plate driving device which reciprocally drives said plurality of movable shielding plates along the x direction in a mutually independent manner; and a shielding-plate controlling device which controls said shielding-plate driving device on a basis of measurement information obtained by said beam profile monitor, and which performs at least one of: a relative increase of an amount of blocking the ion beam by said movable shielding plates which correspond to a position where a measured y-direction beam current density is relatively large; and a relative decrease of an amount of blocking the ion beam by said movable shielding plates which correspond to a position where the measured y-direction beam current density is relatively small, thereby performing a control of improving uniformity of a y-direction beam current density distribution.