|Title||Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||N. Bonanomi, P. Mantica, J. Citrin, C. Giroud, E. Lerche, C. Sozzi, D. Taylor, M. Tsalas, D. Van Eester, JET Contributors|
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.
|Alternate Title||Nucl. Fusion|
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