Patent ID: 7863582
Filing Date: 2011-01-04
Classification: H01J

Abstract:
1. An ion-beam source comprising a plasma generation unit operable to generate a plasma and an ion-extraction unit operable to extract ions from the generated plasma, wherein: the ion-extraction unit comprises at least one grid operable to be maintained under a negative potential relative to ground; and the plasma generation unit comprises: wherein the antenna cell comprises: a ferromagnetic core, an induction coil wound onto the ferromagnetic core, and a cap made from a dielectric material operable to sealingly cover the ferromagnetic core and the induction coil; and wherein the induction coil comprises: a first inductive coil winding and a second inductive coil winding wound on the aforementioned ferromagnetic core, each of the inductive coil windings having a first inductive coil winding end and a second inductive coil winding end; the first end of the first inductive coil winding being electrically connected to a first output terminal of the matching network, the second end of the first inductive winding being electrically connected to the first end of the second inductive winding and to a ground, and a second output terminal of the matching network being electrically connected to the ground.