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

TL;DR

This paper discusses how sublevel population mixing affects Doppler-Shift spectroscopy measurements of neutral beam content, providing correction factors and proposing experimental verification methods to improve measurement accuracy.

Contribution

It introduces models for sublevel population mixing effects and calculates correction factors, addressing measurement uncertainties in neutral beam spectroscopy.

Findings

Mixing causes up to tens of percent uncertainty in measurements.

Correction factors can mitigate the effects of sublevel mixing.

Experimental verification methods are proposed.

Abstract

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.