Articolo in rivista, 2022, ENG, 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

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.

Max-Planck-Institut fuer Plasmaphysik, Garching, Germany; KTH Royal Institute of Technology, Teknikringen, Sweden; United Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, Oxon, United Kingdom; Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), Padova - CNR ISTP - Istituto per la Scienza e Tecnologia dei Plasmi, Sede di Padova, Italy; Dipartimento di Fisica 'G. Occhialini', Università di Milano-Bicocca, Milano, Italy; Oak Ridge National Laboratory, Oak Ridge, USA.

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.

Nuclear fusion 62 (2), pp. 026014-1–026014-11

Keywords

tokamak, heat transport, isotope effect, pedestal stability, quasilinear modelling

CNR authors

Auriemma Fulvio

CNR institutes

ISTP – Istituto per la Scienza e Tecnologia dei Plasmi

ID: 462303

Year: 2022

Type: Articolo in rivista

Creation: 2022-01-12 14:14:36.000

Last update: 2022-03-25 16:31:53.000

CNR authors

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:462303

DOI: 10.1088/1741-4326/ac3e82

ISI Web of Science (WOS): 000732436800001

Scopus: 2-s2.0-85122621650