Abstract
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 thickness of carbon foil and incident energy of neutral hydrogen atoms. In low carbon foil thickness variation of the carbon foil stripping efficiency (ηi) and scattering efficiency of the ions (ηsc) with incident energy is very salient. For foil thickness between 200 and 600 angestrom, scattering efficiency of the chamber will be smaller than 0.11.
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