Patent ID: 9620327
Date: 2017-04-11
CPC Classifications: H01J

Claim:
1. A combined scanning and focusing magnet, comprising: a yoke having a high magnetic permeability, the yoke defining a hole configured to pass an ion beam therethrough; one or more scanner coils operably coupled to the yoke and configured to generate a time-varying predominantly dipole magnetic field when electrically coupled to a power supply; one or more focusing coils operably coupled to the yoke and configured to generate a predominantly multipole magnetic field, wherein the predominantly multipole magnetic field is one of static or time-varying, wherein leads of the focusing magnet coil leads are positioned to eliminate a mutual inductance between the focusing magnet and the scanning magnet; and an adjustable auxiliary yoke, wherein one or more auxiliary coils are wrapped around the auxiliary yoke, wherein the one or more auxiliary coils are positioned in a fringe field region associated with the one or more scanner coils, whereby a mutual inductance between the one or more focusing coils and the one or more scanning coils is generally eliminated.