期刊
NUCLEAR FUSION
卷 61, 期 9, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/ac112e
关键词
laser induced breakdown spectroscopy; short-term fuel retention; in situ in vacuo fuel monitoring; deuterium in tungsten; outgassing process; plasma-wall interaction; fusion material diagnostic
资金
- [633053]
The laser induced breakdown spectroscopy system was used to monitor the short-term retention of deuterium in tungsten plasma-facing materials, showing a reduction in D content in W within the first 240 minutes after plasma termination.
In situ monitoring of the hydrogenic fuel inventory in plasma-facing materials (PFMs) is a key issue for the sustainable and safe operation of a magnetically confined fusion device. A laser induced breakdown spectroscopy system has been applied on the linear plasma device PSI-2 to determine the short-term retention of deuterium (D) in the most promising PFM-tungsten (W). Measurements of the fuel content were performed (a) during plasma exposure, providing the dynamic D content in W and (b) after plasma exposure, determining the outgassing of D from W in vacuum. The in situ measurement of D content in W is in the time range of about 100 minutes before plasma termination (during plasma exposure) to 240 minutes after plasma termination (after plasma exposure). The measured surface D content in W drops to 17%-37% of the initial amount (measured before the plasma is switched off), showing a reduction factor of ca. 3-6 within the first 240 minutes.
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