Patent ID: 7368734
Filing Date: 2008-05-06
Classification: H01J,H01L

Abstract:
1. A method of measuring an ion beam performed in an ion implanting apparatus for irradiating an ion beam to a target by parallelly scanning the ion beam in an x direction, said ion implanting apparatus including a forestage multipoints Faraday and a poststage multipoints Faraday constituted by respectively installing pluralities of detectors for measuring a beam current of the ion beam parallelly in the x direction respectively on an upstream side and a downstream side of the target, said ion implanting apparatus further comprising: a forestage beam restricting shutter provided at a vicinity on an upstream side of the forestage multipoints Faraday, capable of blocking the ion beam and having a side in parallel with the x direction; a forestage shutter driving apparatus for driving the forestage beam restricting shutter in a y direction orthogonal to the x direction; a poststage beam restricting shutter provided at a vicinity on an upstream side of the poststage multipoints Faraday, capable of blocking the ion beam and having a side in parallel with the x direction; and a poststage shutter driving apparatus for driving the poststage beam restricting shutter in the y direction, said method comprising: a poststage beam current density distribution measuring step of calculating a beam current density distribution in the y direction of the ion beam at a position of the forestage beam restricting shutter by measuring a change in the beam current of the ion beam incident on the forestage multipoints Faraday by passing an outer side of the side of the forestage beam restricting shutter while driving the forestage beam restricting shutter in the y direction by the forestage shutter driving apparatus; a forestage center position calculating step of calculating a center position y a postage beam current density distribution measuring step of calculating a beam current density distribution in the y direction of the ion beam at a position of the poststage beam restricting shutter by measuring a change in the beam current of the ion beam incident on the poststage multipoints Faraday by passing an outer side of the side of the poststage beam restricting shutter while driving the poststage beam restricting shutter in the y direction by the poststage shutter driving apparatus; a poststage center position calculating step of calculating a center position y an angle deviation calculating step of calculating an angle deviation θ