Device for extraction and acceleration of ions in a high-flux neutron tube with an additional auxiliary pre-acceleration electrode

摘要

A device is set forth for the extraction and acceleration of ions in a sealed high-flux neutron tube in which an ion beam (3) is extracted from an ion source (1), after which it is accelerated by means of an acceleration electrode (2) so as to be projected onto a target electrode (4) and produce therein a fusion reaction which causes an emission of neutrons. In accordance with the invention, the device also comprises an extraction-pre-acceleration electrode (13) which is arranged between the ion source and the acceleration electrode and which carries a potential such that the beam extracted from the ion source is initially rendered parallel or slightly diverging in order to obtain a laminated ion beam throughout the zone between the ion source and the target electrode.