Experiments in ASDEX Upgrade (AUG) and JET with the ITER-like wall (JET-ILW) are performed to separate the pedestal and core contributions to confinement in H-modes with different main ion masses. A strong isotope mass dependence in the pedestal is found which is enhanced at high gas puffing. This is because the ELM type changes when going from D to H for matched engineering parameters, which is likely due to differences in the inter ELM transport with isotope mass. The pedestal can be matched in H and D plasmas by varying only the triangularity and keeping the engineering parameters relevant for core transport the same. With matched pedestals Astra/TGLF (Sat1geo) core transport simulations predict the experimental profiles equally well for H and D. These core transport simulations show a negligible mass dependence and no gyro-Bohm scaling is observed. However, to match the experimental observations at medium ß it is required to take the fast-ion dilution and rotation into account. This is not enough for high ß plasmas where for the first time a profile match between H and D plasmas was achieved experimentally. Under these conditions quasilinear modelling with TGLF over predicts the transport in the core of H and D plasmas alike.

Schneider, P., Angioni, C., Frassinetti, L., Horvath, L., Maslov, M., Auriemma, F., et al. (2022). The dependence of confinement on the isotope mass in the core and the edge of AUG and JET-ILW H-mode plasmas. NUCLEAR FUSION, 62(2) [10.1088/1741-4326/ac3e82].

The dependence of confinement on the isotope mass in the core and the edge of AUG and JET-ILW H-mode plasmas

Cavedon M.;
2022

Abstract

Experiments in ASDEX Upgrade (AUG) and JET with the ITER-like wall (JET-ILW) are performed to separate the pedestal and core contributions to confinement in H-modes with different main ion masses. A strong isotope mass dependence in the pedestal is found which is enhanced at high gas puffing. This is because the ELM type changes when going from D to H for matched engineering parameters, which is likely due to differences in the inter ELM transport with isotope mass. The pedestal can be matched in H and D plasmas by varying only the triangularity and keeping the engineering parameters relevant for core transport the same. With matched pedestals Astra/TGLF (Sat1geo) core transport simulations predict the experimental profiles equally well for H and D. These core transport simulations show a negligible mass dependence and no gyro-Bohm scaling is observed. However, to match the experimental observations at medium ß it is required to take the fast-ion dilution and rotation into account. This is not enough for high ß plasmas where for the first time a profile match between H and D plasmas was achieved experimentally. Under these conditions quasilinear modelling with TGLF over predicts the transport in the core of H and D plasmas alike.
Articolo in rivista - Articolo scientifico
heat transport; isotope effect; pedestal stability; quasilinear modelling; tokamak;
English
Schneider, P., Angioni, C., Frassinetti, L., Horvath, L., Maslov, M., Auriemma, F., et al. (2022). The dependence of confinement on the isotope mass in the core and the edge of AUG and JET-ILW H-mode plasmas. NUCLEAR FUSION, 62(2) [10.1088/1741-4326/ac3e82].
Schneider, P; Angioni, C; Frassinetti, L; Horvath, L; Maslov, M; Auriemma, F; Cavedon, M; Challis, C; Delabie, E; Dunne, M; Climent, J; Hobirk, J; Kappatou, A; Keeling, D; Kurzan, B; Lennholm, M; Lomanowski, B; Maggi, C; Mcdermott, R; Putterich, T; Thorman, A; Willensdorfer, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/354913
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