Verification of Carbon Density Profile Measurements with Charge Exchange Spectroscopy Using Hydrogen and Deuterium Neutral Beams

Abstract

Verification of carbon density profile measurements with charge exchange spectroscopy of CVI (Δn = 8 - 7, λ = 529.2 nm) using hydrogen and deuterium neutral beams is described. This is a key issue in the study of the comparison of the carbon density profile between hydrogen and deuterium plasma, because the hydrogen neutral beams are injected in the hydrogen plasma and the deuterium neutral beams are injected in the deuterium plasma. By applying the precise beam attenuation calculation using precise atomic data, identical carbon density profile is obtained for the plasma with hydrogen beam and deuterium beam. A Verification of the measurement is performed by comparison of carbon density profile measured with charge exchange spectroscopy and increment of electron density profile just after the carbon pellet injection.