%0 Journal Article
%A Huber, A.
%A Wischmeier, M.
%A Bernert, M.
%A Wiesen, S.
%A Glöggler, S.
%A Aleiferis, S.
%A Brezinsek, S.
%A Calabro, G.
%A Carvalho, P.
%A Huber, V.
%A Sergienko, G.
%A Solano, E. R.
%A Giroud, C.
%A Groth, M.
%A Jachmich, S.
%A Linsmeier, Ch
%A Matthews, G. F.
%A Meigs, A. G.
%A Mertens, Ph
%A Sertoli, M.
%A Silburn, S.
%A Telesca, G.
%T Peculiarity of highly radiating multi-impurity seeded H -mode plasmas on JET with ITER-like wall
%J Physica scripta
%V T171
%@ 1402-4896
%C Stockholm
%I The Royal Swedish Academy of Sciences
%M FZJ-2020-01923
%P 014055 -
%D 2020
%X On JET with fully metallic first wall, highly radiative conditions with N2, Ne and Ar as well as their mixture as radiators are approached in high density H-mode plasmas. The confinement increases from H 98(y,2) = 0.65 in unseeded pulses with γ rad ~ 30% to a value of H 98(y,2) = 0.75 at γ rad ~ 50% with N2 injection. A degradation of the pedestal profile is compensated by steeper core n e and T e profiles. Further increase of γ rad with increase of the N2 seeding rate leads to a moderate confinement degradation which can be avoided by applying of combined impurity seeding. The enhancement of the plasma performance for the radiation fractions beyond 55% with the maximum value of H 98(y,2) = 0.78 is reached with combined N2 + Ne and N2 + Ar impurity injections. The observed intense, strongly localized radiation at the X-point inside the confined plasma in the scenarios with the highest radiated power fraction is interlinked to complete divertor detachment. In the JET-ILW, the X-point radiation is stable, reproducible and reversible.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000520000600055
%R 10.1088/1402-4896/ab5753
%U https://juser.fz-juelich.de/record/875292