Patent ID: 8698107
Filing Date: 2014-04-15
Classification: H01J

Abstract:
1. A method of measuring ion species incident upon a substrate plane received from a plasma comprising: generating the plasma in a plasma chamber, the plasma chamber comprising a plasma sheath modifier and an aperture defined in the plasma sheath modifier, the aperture having a width along a first direction; applying a first potential between the plasma and a time-of-flight (TOF) sensor, the TOF sensor comprising a drift tube having a first end configured to receive ion species generated in the plasma chamber and a detector disposed at a second end of the drift tube; attracting the ion species to the detector of the TOF sensor at a designated ion energy; performing a series of TOF measurements of ions by rotating the drift tube through a first angular range; moving the TOF sensor along the first direction; and performing a further series of TOF measurements of ions by rotating the drift tube through a second angular range.