Patent ID: 6693282
Filing Date: 2004-02-17
Classification: H01J

Abstract:
A source assembly, comprising:a particle emitter operable to generate a beam of electrically charged particles; an electrostatic field assembly including an anode downstream from said particle emitter, said electrostatic field assembly operable to establish a potential difference between said particle emitter and said anode; and a lens effect assembly for focusing the beam of electrically charged particles generated by said particle emitter, said lens effect assembly including a first particle lens arranged between said particle emitter and said anode, said first particle lens operable to be independently energized to focus the beam of electrically charged particles, a second particle lens arranged between said first particle lens and said anode, said second particle lens operable to be independently energized to focus the beam of electrically charged particles, and a diaphragm arranged between said second particle lens and said anode for emitting at least a portion of the beam of electrically charged particles in a downstream direction of said anode.