Abstract
Previous studies with first-principle-based integrated modelling suggested that electron temperature gradient (ETG) turbulence may lead to an anti-gyroBohm isotope scaling in JET high-performance hybrid H-mode scenarios. A dedicated comparison study against higher-fidelity turbulence modelling invalidates this claim. Ion-scale turbulence with magnetic field perturbations included, can match the power balance fluxes within temperature gradient error margins. Multiscale gyrokinetic simulations from two distinct codes produce no significant ETG heat flux, demonstrating that simple rules-of-thumb are insufficient criteria for its onset.
| Original language | English |
|---|---|
| Article number | 086025 |
| Journal | Nuclear Fusion |
| Volume | 62 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 2022 |
Funding
This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No. 101052200\u2014EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. The numerical simulations were carried out on the Marconi cluster at CINECA and the JFRS-1 cluster at IFERC-CSC. The authors thank K.L. van de Plassche for the QuaLiKiz-pythontools and plotting scripts.
Keywords
- gyrokinetics
- integrated modelling
- multiscale turbulence
- reduced order modelling
- tokamak