Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas

TitleEffects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas
Publication TypeJournal Article
Year of Publication2018
AuthorsN. Bonanomi, P. Mantica, J. Citrin, C. Giroud, E. Lerche, C. Sozzi, D. Taylor, M. Tsalas, D. Van Eester, JET Contributors
JournalNuclear Fusion
Volume58
Issue2
Pagination026028
Abstract

A set of experiments was carried out in JET ILW (Joint European Torus with ITER-Like Wall) L-mode plasmas in order to study the effects of light impurities on core ion thermal transport. N was puffed into some discharges and its profile was measured by active Charge Exchange diagnostics, while ICRH power was deposited on- and off-axis in (3 He) - D minority scheme in order to have a scan of local heat flux at constant total power with and without N injection. Experimentally, the ion temperature profiles are more peaked for similar heat fluxes when N is injected in the plasma. Gyro-kinetic simulations using the GENE code indicate that a stabilization of Ion Temperature Gradient driven turbulent transport due to main ion dilution and to changes in T_e /T_i and s / q is responsible of the enhanced peaking. The quasi-linear models TGLF and QuaLiKiz are tested against the experimental and the gyro-kinetic results.

DOI10.1088/1741-4326/aa9e7c
Division

FP

Department

IMT

PID

a5afa1cd02ed07bb15c57c8516a6c1c8

Alternate TitleNucl. Fusion

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