Patent ID: 7012263

Claim:
An ion source apparatus, comprising: a plasma chamber having a supply port for ion source gases; an antenna element for generating plasma in the plasma chamber through a high-frequency voltage supplied from high-frequency power; a plurality of magnetic elements peripherally arranged on wall surfaces of the plasma chamber and forming a cusped magnetic field confining the plasma; an extraction electrode system comprising a plurality of electrodes for extracting ion beams from the plasma; at least one pair of antenna-opposed magnets within the plasma chamber in a region bounded by the cusped magnetic field on opposite sides of the antenna element and relatively moveable in both horizontal and vertical directions to the magnetic elements and the antenna element; and a supporting device to perform a positional adjustment of the antenna-opposed magnets to the antenna element in the plasma chamber so as to form a high-concentrated area for generating electrons around the antenna element through electric fields based on outputs of the antenna element and magnetic fields of the antenna-opposed magnets crossing the antenna element.