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

Nuclear Fushion

article

P.A. Schneider¹  C. Angioni¹  L. Frassinetti²  L. Horvath³  M. Maslov³  F. Auriemma⁴  M. Cavedon¹  C.D. Challis³  E. Delabie⁶  M.G. Dunne¹  J.M. Fontdecaba⁷  J. Hobirk¹  A. Kappatou¹  D.L. Keeling³  B. Kurzan¹  M. Lennholm³  B. Lomanowski⁶  C.F. Maggi³  R.M. McDermott¹  T. Pütterich¹  A. Thorman³  M. Willensdorfer¹ 

[1] Max-Planck-Institut für Plasmaphysik;KTH Royal Institute of Technology;United Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science Centre;Consorzio RFX-CNR, ENEA, INFN, Università di Padova;Dipartimento di Fisica ‘G. Occhialini’, Università di Milano-Bicocca;Oak Ridge National Laboratory;Laboratorio Nacional de Fusión Ciemat

关键词: tokamak;    heat transport;    isotope effect;    pedestal stability;    quasilinear modelling;   

DOI  :  10.1088/1741-4326/ac3e82

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

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 mediumβit is required to take the fast-ion dilution and rotation into account. This is not enough for highβplasmas 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.

【 授权许可】

Unknown