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

Schneider, P. A.; Angioni, C.; Frassinetti, L.; Horvath, L.; Maslov, M.; Auriemma, F.; Cavedon, M.; Challis, C. D.; Delabie, E.; Dunne, M. G.; Climent, J. M. Fontdecaba; Hobirk, J.; Kappatou, A.; Keeling, D. L.; Kurzan, B.; Lennholm, M.; Lomanowski, B.; Maggi, C. F.; McDermott, R. M.; Puetterich, T.; Thorman, A.; Willensdorfer, M.

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 beta it is required to take the fast-ion dilution and rotation into account. This is not enough for high beta 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.

ID 462303
DOI 10.1088/1741-4326/ac3e82
PRODUCT TYPE Journal Article
LAST UPDATE 2022-03-25T16:31:53Z
EU PROJECT EUROfusion
TITLE Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium
FOUNDING PROGRAM H2020
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