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

Schneider, Philip 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, Bart; Maggi, Constanza F.; McDermott, R. M.; Pütterich, T.; Thorman, Alex; Willensdorfer, M.

doi:10.1088/1741-4326/ac3e82

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

Journal Article · Wed Dec 22 00:00:00 EST 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac3e82· OSTI ID:1844844

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Max Planck Society, Garching (Germany). Max Planck Institute for Plasma Physics
KTH Royal Inst. of Technology, Stockholm (Sweden)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE), EURATOM/UKAEA Fusion Association
Univ. di Padova (Italy); CNR-ISTP, Padova (Italy)
Max Planck Society, Garching (Germany). Max Planck Institute for Plasma Physics; Univ. di Milano (Italy)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); EUROfusion Consortium; EURATOM

Contributing Organization:: The ASDEX Upgrade Team; the EUROfusion MST1 Team; JET Contributors

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1844844

Journal Information:: Nuclear Fusion, Vol. 62, Issue 2; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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