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 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 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.

Bonanomi, N., Mantica, P., Citrin, J., Giroud, C., Lerche, E., Sozzi, C., et al. (2018). Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas. NUCLEAR FUSION, 58(2) [10.1088/1741-4326/aa9e7c].

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

Bonanomi, N;Sozzi, C;MARIANI, ALBERTO
2018

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 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 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.
Articolo in rivista - Articolo scientifico
gyrokinetic simulations; light impurities in JET; nuclear fusion; quasilinear simulations; turbulent transport;
Nuclear Fusion, Light impurities, Gyro-kinetic simulations, JET tokamak
English
Bonanomi, N., Mantica, P., Citrin, J., Giroud, C., Lerche, E., Sozzi, C., et al. (2018). Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas. NUCLEAR FUSION, 58(2) [10.1088/1741-4326/aa9e7c].
Bonanomi, N; Mantica, P; Citrin, J; Giroud, C; Lerche, E; Sozzi, C; Taylor, D; Tsalas, M; Van Eester, D; Mariani, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/177947
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