Gyrokinetic GENE simulations of DIII-D near-edge L-mode plasmas
Abstract
We present gyrokinetic simulations with the GENE code addressing the near-edge region of an L-mode plasma in the DIII-D tokamak. At radial position ρ=0.80, simulations with the ion temperature gradient (ITG) increased by 40% above the nominal value give electron and ion heat fluxes that are in simultaneous agreement with the experiment. This gradient increase is consistent with the combined statistical and systematic uncertainty σ of the charge exchange recombination spectroscopy measurements at the 1.6σ level. Multiscale simulations are carried out with a realistic mass ratio and geometry for the first time in the near-edge. These multiscale simulations suggest that the highly unstable ion temperature gradient (ITG) modes of the flux-matched ion-scale simulations suppress electron-scale transport, such that ion-scale simulations are sufficient at this location. At radial position ρ=0.90, nonlinear simulations show a hybrid state of ITG and trapped electron modes, which was not expected from linear simulations. The nonlinear simulations reproduce the total experimental heat flux with the inclusion of E×B shear effects and an increase in the electron temperature gradient by ~23%. This gradient increase is compatible with the combined statistical and systematic uncertainty of the Thomson scattering data at the 1.3σ level. These results are consistent withmore »
- Authors:
-
[1];
[1];
[1];
[3];
[3];
- Univ. of California, Los Angeles, CA (United States)
- Univ. of California, Los Angeles, CA (United States); Max Planck Society, Garching (Germany)
- Max Planck Society, Garching (Germany)
- Univ. of Texas, Austin, TX (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); General Atomics, San Diego, CA (United States); Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- OSTI Identifier:
- 1577588
- Alternate Identifier(s):
- OSTI ID: 1566195; OSTI ID: 2337883
- Grant/Contract Number:
- AC02-05CH11231; FC02-04ER54698; FG02-08ER54984; SC0016073
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 9; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; gyrokinetic; validation; turbulence; gyrokinetic simulations; multiscale methods; nuclear fusion; plasma confinement; plasma flows; plasma turbulence; tokamaks
Citation Formats
Neiser, T. F., Jenko, F., Carter, T. A., Schmitz, L., Told, D., Merlo, G., Bañón Navarro, A., Crandall, P. C., McKee, G. R., and Yan, Z. Gyrokinetic GENE simulations of DIII-D near-edge L-mode plasmas. United States: N. p., 2019.
Web. doi:10.1063/1.5052047.
Neiser, T. F., Jenko, F., Carter, T. A., Schmitz, L., Told, D., Merlo, G., Bañón Navarro, A., Crandall, P. C., McKee, G. R., & Yan, Z. Gyrokinetic GENE simulations of DIII-D near-edge L-mode plasmas. United States. https://doi.org/10.1063/1.5052047
Neiser, T. F., Jenko, F., Carter, T. A., Schmitz, L., Told, D., Merlo, G., Bañón Navarro, A., Crandall, P. C., McKee, G. R., and Yan, Z. Tue .
"Gyrokinetic GENE simulations of DIII-D near-edge L-mode plasmas". United States. https://doi.org/10.1063/1.5052047. https://www.osti.gov/servlets/purl/1577588.
@article{osti_1577588,
title = {Gyrokinetic GENE simulations of DIII-D near-edge L-mode plasmas},
author = {Neiser, T. F. and Jenko, F. and Carter, T. A. and Schmitz, L. and Told, D. and Merlo, G. and Bañón Navarro, A. and Crandall, P. C. and McKee, G. R. and Yan, Z.},
abstractNote = {We present gyrokinetic simulations with the GENE code addressing the near-edge region of an L-mode plasma in the DIII-D tokamak. At radial position ρ=0.80, simulations with the ion temperature gradient (ITG) increased by 40% above the nominal value give electron and ion heat fluxes that are in simultaneous agreement with the experiment. This gradient increase is consistent with the combined statistical and systematic uncertainty σ of the charge exchange recombination spectroscopy measurements at the 1.6σ level. Multiscale simulations are carried out with a realistic mass ratio and geometry for the first time in the near-edge. These multiscale simulations suggest that the highly unstable ion temperature gradient (ITG) modes of the flux-matched ion-scale simulations suppress electron-scale transport, such that ion-scale simulations are sufficient at this location. At radial position ρ=0.90, nonlinear simulations show a hybrid state of ITG and trapped electron modes, which was not expected from linear simulations. The nonlinear simulations reproduce the total experimental heat flux with the inclusion of E×B shear effects and an increase in the electron temperature gradient by ~23%. This gradient increase is compatible with the combined statistical and systematic uncertainty of the Thomson scattering data at the 1.3σ level. These results are consistent with previous findings that gyrokinetic simulations are able to reproduce the experimental heat fluxes by varying input parameters close to their experimental uncertainties, pushing the validation frontier closer to the edge region.},
doi = {10.1063/1.5052047},
journal = {Physics of Plasmas},
number = 9,
volume = 26,
place = {United States},
year = {Tue Sep 24 00:00:00 EDT 2019},
month = {Tue Sep 24 00:00:00 EDT 2019}
}
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