TY  - JOUR
AU  - Huber, A.
AU  - Wischmeier, M.
AU  - Bernert, M.
AU  - Wiesen, S.
AU  - Glöggler, S.
AU  - Aleiferis, S.
AU  - Brezinsek, S.
AU  - Calabro, G.
AU  - Carvalho, P.
AU  - Huber, V.
AU  - Sergienko, G.
AU  - Solano, E. R.
AU  - Giroud, C.
AU  - Groth, M.
AU  - Jachmich, S.
AU  - Linsmeier, Ch
AU  - Matthews, G. F.
AU  - Meigs, A. G.
AU  - Mertens, Ph
AU  - Sertoli, M.
AU  - Silburn, S.
AU  - Telesca, G.
TI  - Peculiarity of highly radiating multi-impurity seeded H -mode plasmas on JET with ITER-like wall
JO  - Physica scripta
VL  - T171
SN  - 1402-4896
CY  - Stockholm
PB  - The Royal Swedish Academy of Sciences
M1  - FZJ-2020-01923
SP  - 014055 -
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000520000600055
DO  - DOI:10.1088/1402-4896/ab5753
UR  - https://juser.fz-juelich.de/record/875292
ER  -