Development of an electrochemical sensor for hydrogen detection in liquid lithium for IFMIF-DONES
Hydrogen impurities in liquid lithium have a drastic disadvantageous impact on the used structural materials. Such a problem might occur also in the planned materials testing facility IFMIF-DONES, where hydrogen isotopes are produced by a reaction of a deuteron-beam with a target of liquid lithium....
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Veröffentlicht in: | Fusion engineering and design 2019-09, Vol.146, p.1441-1445 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Hydrogen impurities in liquid lithium have a drastic disadvantageous impact on the used structural materials. Such a problem might occur also in the planned materials testing facility IFMIF-DONES, where hydrogen isotopes are produced by a reaction of a deuteron-beam with a target of liquid lithium. Therefore, the operation of such a Li-system requires the measurement of hydrogen (seen as impurity in the Li-melt) and the control of hydrogen removal. It is one of the excellences of the tool Electrochemistry to measure dissolved species over wide ranges of concentrations in real-time conditions. This presentation will present the physical background of determining non-metallic impurities in molten metals by measuring electrochemical potentials, outlining the development of such an H-sensor system and the transformation by Nernst correlation into concentration values. Additionally, liquid lithium is a very reactive melt, thus material compatibility is an essential topic for the developments of a durable sensor. Based on these issues a sensor design for measuring hydrogen in liquid lithium was realized under consideration of all physical, chemical and metallurgical aspects, including the successful manufacturing of the sensor as a first prototype and a further first production series. The outlook will also deal with the possibility of measurements of different hydrogen isotopes. |
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ISSN: | 0920-3796 1873-7196 |
DOI: | 10.1016/j.fusengdes.2019.02.100 |