Patent ID: 9520265
Filing Date: 2016-12-13
CPC Classification: H01J

Claim Text:
1. An ion implantation apparatus comprising: a three-stage quadrupole lens system that is used to adjust beam focusing and defocusing, the three-stage quadrupole lens system being placed in a beam transport unit casing, wherein the three-stage quadrupole lens system is constructed of three quadrupole lenses, linearly arranged, having an identical central axis, wherein the three-stage quadrupole lens system is formed such that lens bore diameters increase in stages, and lens lengths of the three quadrupole lenses are set separately, wherein the three-stage quadrupole lens system is configured such that a beam transport of an ion beam along a beamline in the beam transport unit casing is achieved, the beam transport being such that a diameter of the ion beam entering the three-stage quadrupole lens system is increased in a vertical direction and/or a horizontal direction toward a downstream side of the beamline and the ion beam exits from the three-stage quadrupole lens system, and wherein a power supply unit of the three-stage quadrupole lens system includes: wherein the ion implantation apparatus further comprises a controller configured to control the power supply unit, and comprising a plurality of beam transport setting configurations including: wherein the controller is further configured to select one of the plurality of beam transport setting configurations according to a state of the ion beam, and to control the power supply unit according to the selected beam transport setting configuration, and wherein the defocusing beam transport setting configuration comprises a first on-off and/or voltage setting configured such that the separate power supply applies a voltage to the first quadrupole lens only, and the focusing beam transport setting comprising a second on-off and/or voltage setting configured such that the separate power supply and the common power supply apply voltages to the first, second, and third quadrupole lenses.