Validation of edge turbulence codes against the TCV-X21 diverted L-mode reference case

Oliveira, D. S.; Body, T.; Galassi, D.; Theiler, C.; Laribi, E.; Tamain, P.; Stegmeir, A.; Giacomin, M.; Zholobenko, W.; Ricci, P.; Bufferand, H.; Boedo, J. A.; Ciraolo, G.; Colandrea, C.; Coster, D.; de Oliveira, H.; Fourestey, G.; Gorno, S.; Imbeaux, F.; Jenko, F.; Naulin, V.; Offeddu, N.; Reimerdes, H.; Serre, E.; Tsui, C. K.; Varini, N.; Vianello, N.; Wiesenberger, M.; Wüthrich, C.; the TCV Team,

doi:10.1088/1741-4326/ac4cde

Validation of edge turbulence codes against the TCV-X21 diverted L-mode reference case

Journal Article · Tue Jul 19 00:00:00 EDT 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac4cde· OSTI ID:1979412

^[1]; ; ; ; Laribi, E.; Tamain, P.; ; ; ; ; ; Boedo, J. A.; Ciraolo, G.; Colandrea, C.; ; ; Fourestey, G.; ; ; more »

OSTI

Self-consistent full-size turbulent-transport simulations of the divertor and scrape-off-layer (SOL) of existing tokamaks have recently become feasible. This enables the direct comparison of turbulence simulations against experimental measurements. In this work, we perform a series of diverted ohmic L-mode discharges on the tokamak à configuration variable (TCV) tokamak, building a first-of-a-kind dataset for the validation of edge turbulence models. This dataset, referred to as TCV-X21, contains measurements from five diagnostic systems from the outboard midplane (OMP) to the divertor targets—giving a total of 45 one- and two-dimensional comparison observables in two toroidal magnetic field directions. The experimental dataset is used to validate three flux-driven 3D fluid-turbulence models—GBS, GRILLIX and TOKAM3X. With each model, we perform simulations of the TCV-X21 scenario, individually tuning the particle and power source rates to achieve a reasonable match of the upstream separatrix value of density and electron temperature. We find that the simulations match the experimental profiles for most observables at the OMP—both in terms of profile shape and absolute magnitude—while a comparatively poorer agreement is found towards the divertor targets. The match between simulation and experiment is seen to be sensitive to the value of the resistivity, the heat conductivities, the power injection rate and the choice of sheath boundary conditions. Additionally, despite targeting a sheath-limited regime, the discrepancy between simulations and experiment also suggests that the neutral dynamics should be included. The results of this validation show that turbulence models are able to perform simulations of existing devices and achieve reasonable agreement with experimental measurements. Where disagreement is found, the validation helps to identify how the models can be improved. By publicly releasing the experimental dataset and validation analysis, this work should help to guide and accelerate the development of predictive turbulence simulations of the edge and SOL.

View Accepted Manuscript (DOE)

Research Organization:: University of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: TCV Team

Grant/Contract Number:: SC0010529

OSTI ID:: 1979412

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 62; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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