Effect of Incident Energy and Foil Thickness on Foil Stripping and Scattering Efficiency in Charge Exchange Analyzer Detector

摘要

Compact neutral particle analyzer (CNPA) is used to measure ion temperature in tokamaks. Calculating of stripping efficiency and scattering efficiency are most important parameters affecting on CNPA performance. We studied the dependent of these parameters with the thick ness of carbon foil and incident energy of neutral hydrogen atoms. In low carbon foil thickness variation of the carbon foil stripping efficiency (η_j) and scattering efficiency of the ions (η_(sc)) with incident energy is very salient. For foil thickness between 200 and 600 angestrom, scattering effi ciency of the chamber will be smaller than 0.11.