Patent ID: 9390889
Filing Date: 2016-07-12
CPC Classification: H01J

Claim Text:
1. An ion implanter comprising: a radio frequency linear accelerator that accelerates supplied ions in accordance with an acceleration parameter; an energy analysis magnet that is arranged downstream of the radio frequency linear accelerator; an energy analysis slit assembly that is arranged downstream of the energy analysis magnet; a beam measurement unit that measures a beam current amount at a downstream of the energy analysis slit assembly; and a controller that determines the acceleration parameter for a predetermined implantation condition, wherein the acceleration parameter is determined so that at least a part of the supplied ions is accelerated to have target energy, and so that the beam current amount measured by the beam measurement unit is equivalent to a target beam current amount, wherein the energy analysis slit assembly is configured to enable switching between a standard slit opening used for implantation processing performed under the predetermined implantation condition and a high-precision slit opening having higher energy precision than the standard slit opening and used to tune the acceleration parameter.