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Modelling of tungsten erosion and deposition in the divertor of JET-ILW in comparison to experimental findings

Kirschner, A.; Brezinsek, S.; Huber, A.; Meigs, A.; Sergienko, G.; Tskhakaya, D.; Borodin, D.; Groth, M.; Jachmich, S.; Romazanov, J.; Wiesen, S.; Linsmeier, Ch; Abduallev, S.; Abhangi, M.; Abreu, P.; Afzal, M.; Aggarwal, K. M.; Ahlgren, T.; Ahn, J. H.; Aho-Mantila, L.; ... mehr

Abstract:
The erosion, transport and deposition of tungsten in the outer divertor of JET-ILW has been studied for an HMode discharge with low frequency ELMs. For this specific case with an inter-ELM electron temperature at the strike point of about 20 eV, tungsten sputtering between ELMs is almost exclusively due to beryllium impurity and self-sputtering. However, during ELMs tungsten sputtering due to deuterium becomes important and even dominates. The amount of simulated local deposition of tungsten relative to the amount of sputtered tungsten in between ELMs is very high and reaches values of 99% for an electron density of 5E13 cm$^{-3}$ at the strike point and electron temperatures between 10 and 30 eV. Smaller deposition values are simulated with reduced electron density. The direction of the B-field significantly influences the local deposition and leads to a reduction if the E×B drift directs towards the scrape-off-layer. Also, the thermal force can reduce the tungsten deposition, however, an ion temperature gradient of about 0.1 eV/mm or larger is needed for a significant effect. The tungsten deposition simulated during ELMs reaches values of about 98% assuming ELM parameters according to free-streaming model. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000119911
Veröffentlicht am 29.05.2020
Originalveröffentlichung
DOI: 10.1016/j.nme.2019.01.004
Scopus
Zitationen: 12
Web of Science
Zitationen: 10
Dimensions
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Thermofluidik (IATF)
Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2019
Sprache Englisch
Identifikator ISSN: 2352-1791
KITopen-ID: 1000119911
Erschienen in Nuclear materials and energy
Verlag Elsevier
Band 18
Seiten 239-244
Bemerkung zur Veröffentlichung Kollaboration: JET Contributors
Schlagwörter Erosion & Deposition, Tungsten, Sputtering, Impurity transport, JET-ILW
Nachgewiesen in Web of Science
Dimensions
Scopus
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