Patent ID: 9123522
Filing Date: 2015-09-01
Classification: H01J

Abstract:
1. A broadband ion beam analyzer for isolating the required ions from a broadband ion beam, characterized by comprising an upper magnetic pole, a lower magnetic pole, an upper excitation coil, a lower excitation coil, an analysis grating and a magnetic yoke, wherein: the upper excitation coil and the lower excitation coil surround the upper magnetic pole and the lower magnetic pole respectively, and both of the upper excitation coil and the lower excitation coil are connected to an electrical source to generate an uniform magnetic field in the space between the upper magnetic pole and the lower magnetic pole, the broadband ion beam is emitted into the uniform magnetic field from the incident face of the uniform magnetic field, and the required ions are deflected for 180° in the uniform magnetic field and are then emitted out of the uniform magnetic field from the emergence face of the uniform magnetic field; corresponding to the incident face of the uniform magnetic field, the upper magnetic pole and the lower magnetic pole are both provided with an arc-shaped incident-end boundary; corresponding to the emergency face of the uniform magnetic field, the upper magnetic pole and the lower magnetic pole are both provided with an arc-shaped emergence-end boundary; both the arc radii of the incident-end boundary and the emergence-end boundary are equal to the deflection radius of the required ions in the uniform magnetic field; for both of the upper magnetic pole and the lower magnetic pole, the distance between the center of the incident-end boundary and the center of the emergency-end boundary is twice as large as the deflection radius; the analysis grating is provided in the space between the upper magnetic pole and the lower magnetic pole and is adapted to selectively enable the required ions to pass therethrough, an analysis gap is provided on the analysis grating and is located at the position where the required ions focus in the uniform magnetic field; the magnetic yoke is provided around the upper magnetic pole and the lower magnetic pole.