Patent ID: 9738968
Date: 2017-08-22
CPC Classifications: C23C,H01J

Claim:
1. An apparatus, comprising: a beam scanner to apply, during a non-uniform scanning mode, a plurality of different waveforms to generate a scan of an ion beam along a scan direction, wherein a given waveform of the plurality of different waveforms comprises a plurality of scan segments, wherein a first scan segment comprises a first scan rate and a second scan segment comprises a second scan rate different from the first scan rate; a current detector disposed to intercept the ion beam outside of a substrate region and configured to record a measured integrated current of the ion beam for a given waveform; and a scan adjustment component coupled to the beam scanner and comprising logic to determine when a beam width of the ion beam along the scan direction exceeds a threshold; and determine a plurality of current ratios based on the measured integrated current of the ion beam for at least two different waveforms of the plurality of different waveforms when operating in the non-uniform scanning mode.