| 摘要 |
PCT No. PCT/DE88/00152 Sec. 371 Date Nov. 20, 1989 Sec. 102(e) Date Nov. 20, 1989 PCT Filed Mar. 16, 1988 PCT Pub. No. WO88/07259 PCT Pub. Date Sep. 22, 1988.A high-frequency ion source for the production of an ion beam using electron cyclotron resonance has a tubular vessel whose shape matches the desired shape of the beam. The vessel, which is designed to accommodate an ionizable gas, is surrounded by a coil, and the coil is coupled to a high-frequency generator via a resonant circuit. A Helmholtz coil pair matched to the shape of the vessel is arranged to generate a magnetic field which is directed normal to the axis of the coil surrounding the vessel. The vessel is clamped between two plates and one of the plates contains a system for extracting ions from the vessel. The extraction system includes a plurality of spaced electrodes which function to attract and accelerate ions. The electrodes are formed with slotted openings which shape a stream of ions flowing out of the vessel into the form of a flat beam. An additional electrode can be provided to suppress the escape of electrons from the beam back into the vessel.
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