Abstract
Quantitative analysis of 4He in a D2 atmosphere is important for determining D–T plasma fusion parameters and for estimating radiation damage to materials in fusion reactors. In this study, a system with a high-resolution quadrupole mass spectrometer (QMS) and a Zr–Al getter pump was employed in order to analyze a small amount of 4He in a large amount of D2 atomosphere. Using this analysis system, 4He could be detected clearly without depending on its abundance ratio in a gas. A quantitative analysis method has also been proposed. This method can determine the total amount of 4He in a gas with only one parameter; the ion current of the QMS. The quantitative analysis has been performed for 1/10-, 1/100- and 1/10000-admixture gases of 4He and D2. The error of this analysis is estimated to be 6.7%.
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