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Publikācija: Spectrometric Analysis of Inner Divertor Materials of JET Carbon and ITER-like Walls

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity State funding for education
Defending: ,
Publication language English (en)
Title in original language Spectrometric Analysis of Inner Divertor Materials of JET Carbon and ITER-like Walls
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Research platform Materials, Processes, and Technologies
Authors Liga Avotina
Davis Conka
Aigars Vitins
Elina Pajuste
Larisa Baumane
Andris Šutka
Natalija Skute
Gunta Kizane
Keywords JET, Divertor, Tritium, Temperature programmed tritium desorption, Spectrometry
Abstract One of main reasons of the Joint European torus (JET) transformation from the carbon (JET-C) to ITER-like (JET-ILW) wall was high tritium retention of carbon. In order to compare the tritium retention, samples of analogous positions of the plasma-facing side of vertical tiles No. 3 of two campaigns: JET-C (2008–2009) and JET-ILW (2011–2012) were cut out. Temperature-programmed tritium desorption spectrometry in He + 0.1% H2 gas flow showed that JET-C sample without a tungsten coating had by a factor of >20 higher surface concentration of tritium than JET-ILW tungsten-coated sample: 4.9 × 1013 and 1.7–2.2 × 1012 T atoms/cm2 respectively. Installation of metallic plasma facing wall in the JET was a unique possibility to collect from the vacuum vessel the first wall erosion products (EP) – dust and flakes. Selected EP were investigated by means of energy dispersion X-ray (EDX), electron spin resonance (ESR), infrared and Raman spectrometry. EDX analysis shows presence of metallic impurities and carbon as a main component. Investigations with ESR spectrometry allows to estimate presence of two main paramagnetic centres – g = 2.002 and g = 2.12. Infrared spectra show presence of inorganic oxides. The obtained results supplement the information about composition of the EP from fusion devices.
DOI: 10.1016/j.fusengdes.2018.11.037
Hyperlink: https://www.sciencedirect.com/science/article/pii/S0920379618307440 
Reference Avotina, L., Conka, D., Vitins, A., Pajuste, E., Baumane, L., Šutka, A., Skute, N., Kizane, G. Spectrometric Analysis of Inner Divertor Materials of JET Carbon and ITER-like Walls. Fusion Engineering and Design, 2019, Vol. 146, pp.82-86. ISSN 0920-3796. Available from: doi:10.1016/j.fusengdes.2018.11.037
Additional information Citation count:
  • Scopus  0
ID 30355