Publication: Accounting for edge plasma parameters dynamics at jet divertor sputtering estimation during edge-localized modes УЧЕТ ИЗМЕНЕНИЯ ПРОФИЛЯ ПАРАМЕТРОВ ПРИГРАНИЧНОИ ПЛАЗМЫ ПРИ ОЦЕНКЕ РАСПЫЛЕНИЯ ДИВЕРТОРНЫХ ПЛАСТИН ТОКАМАКА JET В РЕЖИМЕ С ГРАНИЧНО-ЛОКАЛИЗОВАННЫМИ МОДАМИ
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2019
Авторы
Borodkina, I. E.
Kurnaev, V. A.
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© 2019 National Research Center Kurchatov Institute. All rights reserved.The sputtering of tungsten divertor tiles at JET ITER-like wall (ILW) during Edge-Localized Modes (ELM) is one of the main sources of W impurity in the core plasma. The analytical approach for interpretation of the Langmuir probe (LP) measurements of ion flux at the divertor tile is elaborated to model the ELM ion parallel transport and to estimate the W sputtering flux from divertor in inter- and intra-ELM conditions. Accounting for the pedestal temperature and density decrease at the pedestal crash during ELM allows obtaining the particle and heat fluxes profiles at the divertor tile corresponding to the measurements at the physically correct magnetic connection length. Estimates of tungsten sputtered flux in intra-ELM and inter-ELM conditions show that Type I ELMs contribute significantly (~85%) to the overall tungsten sputtering which is in a good agreement with the divertor optical emission spectroscopy on the 400.9 nm atomic neutral tungsten line in JET discharges.
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Borodkina, I. E. Accounting for edge plasma parameters dynamics at jet divertor sputtering estimation during edge-localized modes УЧЕТ ИЗМЕНЕНИЯ ПРОФИЛЯ ПАРАМЕТРОВ ПРИГРАНИЧНОИ ПЛАЗМЫ ПРИ ОЦЕНКЕ РАСПЫЛЕНИЯ ДИВЕРТОРНЫХ ПЛАСТИН ТОКАМАКА JET В РЕЖИМЕ С ГРАНИЧНО-ЛОКАЛИЗОВАННЫМИ МОДАМИ / Borodkina, I.E., Kurnaev, V.A. // Problems of Atomic Science and Technology, Series Thermonuclear Fusion. - 2019. - 42. - № 3. - P. 5-12. - 10.21517/0202-3822-2019-42-3-5-12