Abstract:
PROBLEM TO BE SOLVED: To provide a mass separation device for separating one or a plurality of ion species contained in an introduced ion beam by curving an orbit of an ion beam by magnetic field action depending on ion mass, capable of improving mass separation performance without decreasing an ion beam current amount. SOLUTION: The mass separation device 130 for separating the one or the plurality of ion species contained in the ion beam by curving the orbit of the ion beam by the magnetic field action depending on the ion mass improves mass separation performance without greatly reducing an ion beam current by entering the ion beam by inclining from a vertical direction with respect to an ion beam incident surface 130a of the mass separation device 130, and thus the ion beam separated by mass with high precision can be generated. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To enable to reduce an operating loss caused by replacement of a deteriorated filament 15, by prolonging life through restraint of deterioration of the filament 15, in producing boron ion by making thermal electron released from the filament 15 collide with molecules of material gas containing boron atoms. SOLUTION: The filament 15 is heated by heating means 16, 27 up to a temperature higher than a melting point of boron. With this, boron is prevented from depositing on the filament in a solid phase, so that chemical reaction between the boron and the filament material can be restrained to suppress chemical deterioration of the filament, and therefore, the life of the filament 15 is overwhelmingly affected by chemical deterioration than physical deterioration by heat in relation to boron ion. COPYRIGHT: (C)2007,JPO&INPIT