A quantitative analysis of hydrogen isotope retention in tokamak first wall materials by optical spectroscopy and mass-spectrometry
Smirnova E.V.1,2,3, Medvedev O.S.1,4, Razdobarin A.G., Elets D.I.1,2,4, Snigirev L.A.1,2, Miroshnikov I.V.1, Bukreev I.M.1, Gasparyan Y.M.2,4
1Ioffe Institute, St. Petersburg, Russia
2St. Petersburg State University, St. Petersburg, Russia
3ITMO University, St. Petersburg, Russia
4National Research Nuclear University “MEPhI”, Moscow, Russia
Email: evsmirnova@mail.ioffe.ru
In this work, the opportunity of laser-induced ablation for diagnostics of hydrogen isotope retention is demonstrated. The analysis of residual gases based on mass spectrometry and Penning discharge optical spectroscopy were used as methods for measuring the deuterium flux. It is shown that the optical spectroscopy of the Penning discharge measures a larger number of deuterium atoms than mass spectrometry analysis. The difference of the quantitative evaluation relates to the registration of D2, H2, HD molecules by mass spectrometer, while the Penning discharge optical spectroscopy shows the presence of protium and deuterium regardless of the chemical composition of the material. Keywords: Hydrogen isotopes, Penning discharge spectroscopy, mass-spectrometry, laser-induced ablation, tokamak first wall, tritium retention diagnostic.
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