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
2018
58
2
026028
none
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].
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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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