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First mirror test in JET for ITER: Complete overview after three ILW campaigns

JET Contributors; Moon, Sunwoo; Petersson, P.; Rubel, M.; Fortuna-Zalesna, E.; Widdowson, A.; Jachmich, S.; Litnovsky, A.; Alves, E.; Abduallev, S.; Abhangi, M.; Abreu, P.; Afzal, M.; Aggarwal, K. M.; Ahlgren, T.; Ahn, J. H.; Aho-Mantila, L.; Aiba, N.; Airila, M.; ... mehr


The First Mirror Test for ITER has been carried out in JET with mirrors exposed during: (i) the third ILW campaign (ILW-3, 2015–2016, 23.33 h plasma) and (ii) all three campaigns, i.e. ILW-1 to ILW-3: 2011–2016, 63,52 h in total. All mirrors from main chamber wall show no significant changes of the total reflectivity from the initial value and the diffuse reflectivity does not exceed 3% in the spectral range above 500 nm. The modified layer on surface has very small amount of impurities such as D, Be, C, N, O and Ni. All mirrors from the divertor (inner, outer, base under the bulk W tile) lost reflectivity by 20–80% due to the beryllium-rich deposition also containing D, C, N, O, Ni and W. In the inner divertor N reaches 5×10$^{17}$ cm$^{-2}$, W is up to 4.3×10$^{17}$ cm$^{-2}$, while the content of Ni is the greatest in the outer divertor: 3.8×10$^{17}$ cm$^{-2}$. Oxygen-18 used as the tracer in experiments at the end of ILW-3 has been detected at the level of 1.1×10$^{16}$ cm$^{-2}$. The thickness of deposited layer is in the range of 90 nm to 900 nm. The layer growth rate in the base (2.7 pm s$^{-1}$) and inner divertor is proportional to the exposure time when a single campaign and all three are compared. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000119795
Veröffentlicht am 27.05.2020
DOI: 10.1016/j.nme.2019.02.009
Zitationen: 24
Zitationen: 24
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Thermofluidik (IATF)
Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2019
Sprache Englisch
Identifikator ISSN: 2352-1791
KITopen-ID: 1000119795
Erschienen in Nuclear materials and energy
Verlag Elsevier
Band 19
Seiten 59-66
Schlagwörter JET, First Mirror Test, Diagnostic mirrors, Erosion-deposition, ITER-like Wall, PACS, 52.40 Hf
Nachgewiesen in Web of Science
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