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@ARTICLE{Telesca:904080,
author = {Telesca, G. and Ivanova-Stanik, I. and Perez von Thun, Ch.
and Aleiferis, S. and Brezinsek, S. and Chomiczewska, A. and
Huber, A. and Kowalska-Strzeciwilk, E. and Pawelec, E. and
Sertoli, M. and Zagórski, R. and Contributors, JET},
title = {{I}mpurity behaviour in {JET}-{ILW} plasmas fuelled with
gas and/or with pellets: a comparative study with the
transport code {COREDIV}},
journal = {Nuclear fusion},
volume = {61},
number = {6},
issn = {0029-5515},
address = {Vienna},
publisher = {IAEA},
reportid = {FZJ-2021-05650},
pages = {066027 -},
year = {2021},
note = {kein Zugriff auf Postprint},
abstract = {This study deals with the comparison of impurity behaviour
in pellet and gas fuelled JET-ITER like wall pulses with the
aim of finding the mechanisms leading to the generally
observed higher concentration of tungsten in pellet fuelled
plasmas. In fact, tungsten is the main high-Z impurity in
the JET-ILW plasmas and is responsible for most of the
radiative losses in the plasma core. Analysis of the
experimental data pertaining to pulses at different plasma
currents, different input power and different electron
densities is integrated by numerical modelling with the
self-consistent fluid transport code COREDIV.
Experimentally, and numerically, the ratio between the
radiated power in the divertor and the total one—which
results to be an increasing function of the ratio of the
electron density at the strike point to the volume average
one—is found to be a critical parameter determining
impurity accumulation. The higher this value the lower the
impurity density in the plasma core. Together with a little
higher core impurity residence time, the numerical modelling
indicates that the modest divertor screening for the pellet
fuelled pulses at low electron flow—characterized by low
electron density at the strike point and low perpendicular
transport in the SOL—leads to divertor impurity leakage
and higher impurity fluxes through the separatrix, in
agreement with theory.},
cin = {IEK-4},
ddc = {620},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {134 - Plasma-Wand-Wechselwirkung (POF4-134)},
pid = {G:(DE-HGF)POF4-134},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000655566800001},
doi = {10.1088/1741-4326/abf74c},
url = {https://juser.fz-juelich.de/record/904080},
}