Effect of Sublevel Population Mixing on the Interpretation of Doppler-Shift Spectroscopy Measurements of Neutral Beam Content

Interpretation of Doppler-Shift spectroscopy measurement of neutral beams species content requires an assumption about distribution of populations of thin structure of excited state (hydrogen n=3). In the paper several effects caused mixing of sublevel population are discussed and correction factors for different models of thin structure population are calculated. Such mixing can lead to tens percent uncertainty of results of measurements of beam species content. A possible way for experimental verification of sublevel population mixing is proposed.