Simulating the Tritium Emission Line in a Deuterium Spectrum for Diagnostic Residual Gas Analyzer Detectability*

The ITER Diagnostic Residual Gas Analyzer (DRGA) is a system that utilizes mass and optical spectroscopy to determine the neutral gas isotopic composition to a high precision [1]. This capability makes the DRGA an integral part of the fusion fuel cycle [2]. The deuterium and tritium compositions are partly determined by Optical Gas Analysis (OGA), which employs a cold plasma source to produce the optical spectra. To quantify the level of detectability and uncertainty of the tritium concentration measured by OGA, we tested two cold plasma emission sources, a Penning- and inverse magnetron- type. Due to its low availability and radioactivity, tritium was not used for lab testing. Utilizing emission spectra from known mixtures of hydrogen, deuterium, and helium, we simulated a tritium line in the spectra to determine its detectability.

[1] S. Vartanian et. al., Fusion Engineering and Design, DOI: 10.1016/j.fusengdes.2021.112511

[2] C.C. Klepper et. al., IEEE-TPS, DOI: 10.1109/TPS.2022.3223648

This work was supported under the U.S. D.O.E. contract DE-AC05-00OR22725.