Patent ID: 9111713
Filing Date: 2015-08-18
Classification: H01J

Abstract:
1. An ion source, comprising: a target from which plasma including electrons and positive ions is generated by laser irradiation; a first power supply source that sets an electric potential of the target higher than that of an electric potential applied to an acceleration channel that accelerates the positive ions as they pass through the acceleration channel; a filter electrode provided on a path of the plasma from the target to the acceleration channel; a second power supply source that sets an electric potential of the filter electrode higher than the electric potential of the target; an ionization chamber that accommodates the target and the filter electrode, and having an electric potential set to the same electric potential as that of the electric potential of the target; and a communicating path that connects the ionization chamber and a linear accelerator accommodating the acceleration channel, plasma passing through the communicating path after passing through the filter electrode.